ROHM 7-Segment LED EOL: Replacement Evaluation Guide

ROHM has issued end-of-life (EOL) notices for several of its LED seven-segment displays, which affects both continuity of supply and long-term maintenance for designs already in production. This article approaches the problem from an engineering and purchasing point of view: the cross-reference part numbers available as replacements, the design differences that matter in practice (font, package dimensions, pin count and pitch), and a risk-and-cost assessment of the question everything hinges on, which is whether the PCB has to be modified. The goal is to keep production stable on a lead time and a cost you can control.
For the full cross-reference list or a case-by-case evaluation, download the summary file at the end of this article and contact our engineering desk for technical advice.

Why ROHM Discontinued Its Seven-Segment LED Displays: Technical Pain Points and Reliability Challenges

Most of ROHM’s older-generation LED displays use a narrow pin pitch together with a non-standard lead design. As process technology moved on, that narrow pitch became more prone to solder bridging and shorts during reflow, which puts pressure on both yield and reliability; switching to round-head pins to suit the short pitch can introduce soldering instability of its own. Once line efficiency falls and unit cost rises, keeping the old process commercially viable becomes harder to justify. That is the industry backdrop to the steady stream of EOL notices on these part numbers.

Cross-Reference BOM: ROHM Semiconductor EOL Seven-Segment LED Displays to Opto Plus LED
)

ROHM Bending-Pin Seven-Segment LED Display Cross-Reference Table

For the ROHM bending-pin LED displays that have been discontinued, Opto Plus LED has compiled a complete cross-reference list, available to download ROHM　Bending pin LED DISPLAY to OPTO PLUS LED DISPLAY Cross list, or refer to the image below.

ROHM 1-Digit LED Seven-Segment Display Cross-Reference Table

For the ROHM 1-digit LED displays that have been discontinued, Opto Plus LED has compiled a complete cross-reference list, available to download ROHM 1 Digit LED DISPLAY to OPTO PLUS LED DISPLAY Cross list, or refer to the image below.

ROHM 2-Digit LED Seven-Segment Display Cross-Reference Table

For the ROHM 2-digit LED displays that have been discontinued, Opto Plus LED has compiled a complete cross-reference list, available to download ROHM 2 Digit LED DISPLAY to OPTO PLUS LED DISPLAY Cross list, or refer to the image below.

ROHM 3-Digit LED Display Cross-Reference Table

For the ROHM 3-digit LED displays that have been discontinued, Opto Plus LED has compiled a complete cross-reference list, available to download ROHM 3 Digit LED DISPLAY to OPTO PLUS LED DISPLAY Cross list, or refer to the image below.

Key Differences Between the ROHM and Opto Plus LED Seven-Segment Cross-References

Standard LED displays from different manufacturers inevitably differ in appearance and specification, so when a product line goes EOL, finding an exact drop-in replacement is close to impossible. The point of a cross-reference is not to be 100 percent identical; it is to keep the amount of redesign on the customer side as small as possible. Our standard LED displays have been proven in the field by customers in home appliances, consumer electronics, medical equipment and instrumentation, which is what makes them a dependable route off a ROHM part.

Do the ROHM EOL Seven-Segment Displays Use the Same Font as the Cross-Referenced Parts?

Seven-segment font design often varies noticeably between manufacturers, round segments versus diamond segments being the common example, so the digits do not look identical. A customer who needs the font to match exactly has to move to a custom part, which normally means USD 3,000 to 4,000 in tooling (that figure covers a simple font change on an existing package; a fully custom display is typically USD 3,600 to 10,000), plus roughly USD 600 in PCB design fees if the circuit and pinout also have to match. The catch is that the old pinouts are low-yield designs, and few manufacturers will take on a small custom order for them. In practice most cross-reference requirements only need the character size to be close, and insisting on an exact match costs far more than it is worth. Our advice is to evaluate the standard parts and test samples first to confirm the fit.

Are the ROHM EOL Seven-Segment Displays the Same Length, Width and Height as the Cross-Referenced Parts?

Dimensions vary as well. Length and width need closer scrutiny because they directly affect the space available on the PCB; height is usually more forgiving, since most mechanical designs leave some clearance. A customer who genuinely needs all three dimensions to match exactly is again looking at a custom development, with the same costs as the font case above. In most situations, matching the outline closely is enough and a small height difference can be absorbed by the mechanical design, which is a far better use of the budget.

Do the EOL Seven-Segment Displays Have the Same Pins, Pitch and Pin Positions as the Cross-Referenced Parts?

ROHM LED displays mostly use IC-style pins with a narrow pitch, and the leads sit close to the edge of the PCB. That is an older process design with lower yield and lower reliability. The Opto Plus replacements use round-head pins on a standard 2.54 mm pitch, with more clearance between the leads and the board edge, in line with current process requirements. If your existing PCB layout cannot accommodate the new pitch directly, modifying the layout is the more economical route. Almost no manufacturer will accept a custom order built around the old narrow-pitch pins, because the yield is low and the cost is high.

What Happens If You Do Not Modify the Original PCB

Choosing not to modify the original PCB layout to accept a replacement for an EOL component (for example moving from a ROHM LED display to the corresponding Opto Plus part) exposes the product to several risks. These are the familiar failure modes of electronics manufacturing, and they lead to broken supply, higher cost and, in the worst case, a product that cannot ship. The main risks are:

• Supply interruption and stalled production: once the remaining EOL stock is gone there is nothing left to buy, so the line stops and deliveries slip. Outages of several weeks or several months are realistic.
• Sharply higher cost: sourcing scarce EOL parts or commissioning a custom replacement is expensive, whether the money goes on redesign or on buying from the broker market. Either way it costs far more than simply modifying the PCB.
• Reliability and quality risk: forcing an incompatible replacement into the design invites electrical faults, soldering problems and unstable performance. That shortens product life and pushes up field-return rates, which matters most in high-reliability sectors such as medical and industrial equipment.

• Loss of competitiveness: delays in production or increases in cost push the launch date out, which means missed market windows and damage to the company reputation.

• Compliance and legal exposure: in tightly regulated sectors, shipping obsolete components can breach safety standards or trigger a product recall, with the liability and penalties that follow.
• Harder long-term maintenance: leaving the PCB untouched makes every future upgrade more complicated, and it keeps the supply risk and the whole-life cost on the books indefinitely.

Making the Case Internally: Why the LED Display Replacement Needs a PCB Change

We are currently sourcing a replacement for the discontinued ROHM LED display. The functionally equivalent parts on the market do not share the old pinout, and that is the technical constraint we have to work within.
Holding out for a pin-to-pin compatible part purely to avoid touching the PCB carries the following risks:

• Production cost and yield: the old pinout is an obsolete, low-yield process. Asking a new supplier to reproduce it substantially raises the incidence of open joints and shorts in production, which drives up manufacturing cost and can push scrap rates higher.
• Quality and reliability: unstable solder joints can fail after a period in the field. That adds repair and after-sales cost, and it puts the brand at risk.
• Supply-chain fragility: fewer and fewer suppliers are willing to invest in or maintain a retired process. If we refuse to change, the pool of suppliers we can use shrinks to almost nothing, and the moment the last one exits we are back in the same position.

• Competitiveness: high cost and unstable yield make any quotation built on the old process uncompetitive, and unreliable lead times strain customer relationships.

Modifying the PCB costs time and money up front, but it pays back. It moves us onto a stable current process, protects quality, lowers risk and strengthens the supply chain. That is what keeps the product competitive over the long run.

Notes on Cost and Development

The tooling cost (roughly USD 3,000 to 4,000) and PCB design fee (roughly USD 600) quoted in this article are for reference only. Actual cost depends on the product specification, order quantity and process conditions, and is not a fixed quotation. Contact us for an accurate quote.

How Opto Plus LED Adapts Its Catalogue Standard Parts to Match ROHM Products

The datasheets published on the Opto Plus LED website cover our standard LED display series, which are generally rated at 20 mA continuous forward current rather than the 10 mA used by ROHM. The pin length also differs from ROHM parts, and is usually 4 mm on our standard products. To close that gap we produce a lightly customised version of the standard part. OPD-S5220LA-4D-BW is one example: it is OPD-S5220LA-BW adapted for the ROHM drive current and pin length. Changes of this kind need very little tooling. Start from the standard datasheet, and when you are ready to place a formal order contact Sales@opledtw.com for the full specification.

ROHM Bent-Angle IC Pin Series Cross-Reference Table

Cross-Reference Recommendations for LF-3011VA, LF-3011VK, LF-3011MA and LF-3011MK

Download the complete list ROHM Bending pin LED DISPLAY to OPTO PLUS LED DISPLAY Cross list.

The bend angle on the pins of the LF-3011 series is a ROHM-specific structure. Keeping the 90-degree bend would require a dedicated pin-bending jig on top of the reliability concerns, so these four part numbers cannot be supplied as direct equivalents. Our recommendation is to move to a flat Opto Plus SMD display from the standard range and adjust the PCB layout to suit its outline, which avoids the extra tooling cost altogether. If you cannot change the PCB but can accept a flat SMD display, we can build to the original ROHM specification as acustom part, which carries a tooling charge of roughly USD 3,000 to 4,000.

ROHM Single-Digit Seven-Segment LED Display Cross-Reference Table

Download the complete list ROHM 1 Digit LED DISPLAY to OPTO PLUS LED DISPLAY Cross list.

Cross-Reference Recommendations for LA-501VD and LA-501VN

LA-501VD and LA-501VN are ROHM single-digit red displays. Opto Plus OPD-S5220LR-4D-BW and OPD-S5221LR-4D-BW match within a dimensional tolerance of plus or minus 0.25 mm and are viable replacements once validated in the application.

Cross-Reference Recommendations for LA-501DD and LA-501DN

LA-501DD and LA-501DN are single-digit amber displays. The corresponding parts are Opto Plus OPD-S5220LA-4D-BW and OPD-S5221LA-4D-BW, within a tolerance of plus or minus 0.25 mm.

Cross-Reference Recommendations for LA-501MN and LA-501MD

LA-501MN and LA-501MD are the green versions. Opto Plus OPD-S5221YG-4D-BW and OPD-S5220YG-4D-BW are compatible.

Cross-Reference Recommendations for LA-601AB, LA-601VB, LA-601AL and LA-601VL

This series covers red and high-brightness red displays. The Opto Plus replacements match within a tolerance of plus or minus 0.1 mm, for example LA-601VB to OPD-S5620LR-4D-BW.

Cross-Reference Recommendations for LA-601DB, LA-601EB, LAP-601DB, LA-601EL and LA-601DL

The amber versions, LA-601DB among them, correspond to Opto Plus OPD-S5620LA-4D-BW, with matching dimensions.

Cross-Reference Recommendations for LA-601MB and LA-601ML

The green versions, LA-601MB among them, correspond to OPD-S5620YG-4D-BW.

Cross-Reference Recommendations for LA-601XB, LAP-601YB, LA-601XL and LAP-601YL

The yellow versions, LA-601XB among them, correspond to OPD-S5620LY-4D-BW, with only a marginal dimensional difference.

ROHM Dual-Digit Seven-Segment LED Display Cross-Reference Table

Download the complete list ROHM 2 Digit LED DISPLAY to OPTO PLUS LED DISPLAY Cross list

Cross-Reference Recommendations for LB-402VD and LB-402VN

LB-402VD and LB-402VN are dual-digit red displays. Opto Plus OPD-D4314LR-4D-BW and OPD-D4315LR-4D-BW are compatible.

Cross-Reference Recommendations for LB-402DD, LB-402MD and LB-402MN

LB-402DD is orange, and LB-402MD and LB-402MN are green; all three are two-digit displays measuring 24.0 x 18.0 x 7.0 mm. The corresponding Opto Plus parts are OPD-D4314LA-4D-BW (amber), OPD-D4314YG-4D-BW and OPD-D4315YG-4D-BW (green), measuring 23.8 x 18.8 x 6.5 mm. Unlike the LB-502 series, this group is not a dimensional match, so check the panel cut-out and viewing-area tolerances before committing to the change.

Cross-Reference Recommendations for LB-502VD, LB-502VN, LB-502DD, LB-502DN, LB-502MD and LB-502MN

The LB-502 series covers red, amber and green versions and measures 25.0 by 17.5 by 7.0 mm, matching the Opto Plus replacements exactly. LB-502VD maps to OPD-D5210LR-4D-BW, for example.

Cross-Reference Recommendations for the LB-602 Series

Download the complete list ROHM 2 Digit LED DISPLAY to OPTO PLUS LED DISPLAY Cross list

High-brightness red and red (LB-602AA2, LB-602AK2, LB-602VA2, LB-602VK2 and others)

The high-brightness red versions, LB-602AA2 among them, correspond to OPD-D5630LE-4D-BW.

Amber (LB-602DA2, LB-602EA2, LBP-602DA2, LB-602DK2, LB-602EK2, LBP-602DK2and others)

The amber versions, LB-602DA2 among them, correspond to OPD-D5630LA-4D-BW, with matching dimensions.

Green and yellow (LB-602MA2, LB-602MK2, LB-602XA2, LB-602XK2, LBP-602YK2 and others)

The green and yellow versions, LB-602MA2 among them, correspond to OPD-D5630YG-4D-BW and OPD-D5630LY-4D-BW.

Download the complete list ROHM 2 Digit LED DISPLAY to OPTO PLUS LED DISPLAY Cross list.

ROHM Triple-Digit Seven-Segment LED Display Cross-Reference Table

Cross-Reference Recommendations for LB-603VF, LB-603VP, LB-603MF and LB-603MP

The LB-603 series (triple-digit, red and green) is widely used in power supplies and medical instruments. A representative replacement is LB-603VF to OPD-T5622LR-4D-BW, with matching dimensions and replacement viability confirmed once validated in the application.

Conclusion

The discontinuation of the ROHM LED displays introduces real uncertainty into the continuity of your product supply, and it is also an opening. Moving to the Opto Plus LED standard range gives you a more stable and more cost-effective part, and strengthens the product for the long term. Our displays are closely compatible with the ROHM series in both dimensions and performance, and our engineering support is there to make sure the transition into your existing design is a clean one. If you are working through a replacement decision right now, we are ready to help you handle the change and keep your product where it needs to be in the market. For the complete cross-reference list or technical advice, pleasecontact us.

FAQ

Further reading on 7-segment and 16-segment displays

Read on for related material covering part selection, drive circuits and real-world operating conditions.

• 7-Segment vs. 16-Segment LED Displays: Types and Internal Structures
• Dot-Matrix Displays: Names, Types, Internal Structure, and Applications
• How 7-Segment and 16-Segment LED Displays Show Numbers and Letters
• Common LED Display Defects: Uneven Color

How this article was checked

Author and technical reviewer: Jarvis Yang — Vice President & R&D Manager, OPTO PLUS LED

Test and verification method

Compare the original and candidate datasheets field by field. Verify outline dimensions, digit height and pitch, pin numbering, polarity, forward voltage, test current, luminous intensity, color coordinates, viewing angle and operating temperature. A cross-reference is not treated as pin-to-pin until a sample is checked in the customer circuit.

Sources

• ROHM LED Displays
• OPTO PLUS standard LED display catalog

Verification chart

Check	What is verified
Mechanical fit	Outline, digit height, pitch, pin position
Electrical fit	Polarity, pinout, VF, IF and drive method
Optical fit	Color, intensity, uniformity and viewing angle

Final selection and production conditions must be confirmed against the exact part-number datasheet, sample test and approved drawing.