VOMA617A-3X001T
Vishay Siliconix
Needs validationlow risk
Strong SOP-4 packaged alternative with higher VCEO, but narrower CTR and different temperature range.
Best Alternatives to SFH690BT
Finding a substitute for the SFH690BT optocoupler involves balancing package compatibility with electrical performance. While several functional alternatives exist, careful review of parameters like CTR and VCEO is essential for a successful replacement.
AI replacement insight
Package riskmedium
Most candidates are in different packages (SSOP-4, SOP-4L) and are not drop-in replacements.
Electrical risklow
Key parameters like CTR and operating temperature differ across candidates and must be verified.
Can it be replaced directly?
Direct replacement for SFH690BT should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
VOMA617A-3X001T is the most promising alternative due to its matching SOP-4 package and superior VCEO. However, it requires careful review.
Main risk
The primary risk is package incompatibility for most alternatives, requiring a PCB redesign. For the pin-compatible option, parametric differences in CTR and temperature are the main concern.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | SFH690BT | VOMA617A-3X001T | TCMT1109 | SFH6156-3T | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOP-4 | SOP-4 | SSOP-4 | SMD-4 | SOP-4 / SSOP-4 / SMD-4 / SOP-4L — Package matches, likely form-fit compatible.; TCMT1109: Package is different (SSOP-4 vs SOP-4) and not footprint compatible.; SFH6156-3T: Package name is generic (SMD-4) and requires verification against SOP-4 footprint.; TCLT1003: Package is different (SOP-4L vs SOP-4) and may not be footprint compatible. |
| Voltage | 70 V | 80 V | 70 V | 70 V | 80 V / 70 V — Collector-Emitter Voltage (VCEO) is higher, providing more margin.; TCMT1109: Collector-Emitter Voltage (VCEO) matches.; SFH6156-3T: Collector-Emitter Voltage (VCEO) matches.; TCLT1003: Collector-Emitter Voltage (VCEO) matches. |
| Ctr | 100-300% | 100-200% | 200-400% | 100-200% | 100-200% / 200-400% — Current Transfer Ratio (CTR) range is narrower. Min CTR matches, max is lower.; TCMT1109: Current Transfer Ratio (CTR) range is higher.; SFH6156-3T: Current Transfer Ratio (CTR) range is narrower.; TCLT1003: Current Transfer Ratio (CTR) range is narrower. |
| Temperature | -55°C to +100°C | -40°C to +110°C | - | - | -40°C to +110°C — Operating temperature range has a higher minimum (-40°C vs -55°C). |
Application & sourcing insights
Questions & answers
Verified drop-in options for SFH690BT are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.