BL1551B
BL
Needs validationlow risk
Strong form-fit-function match with identical package and bandwidth, and better on-resistance.
Best Alternatives to UMW3157
UMW3157 is a high-speed SPDT analog switch in a SC70-6 package, operating from 1.65V to 5.5V. This page provides a review of potential alternatives, including pin-compatible options and functional replacements.
AI replacement insight
Package risklow
SC70-6 is a standard package with many options.
Electrical riskmedium
Bandwidth, temperature range, and min voltage must be carefully checked.
Firmware risklow
Device is a simple logic-controlled switch, no firmware impact.
Can it be replaced directly?
No officially verified direct replacement exists. However, BL1551B is a very strong form, fit, and function candidate that requires minimal engineering review.
Best replacement path
Start with BL1551B or TMUX1219DCKR, as they offer the best parametric alignment. Verify pinout and minor differences in voltage and temperature range.
Main risk
The primary risk is substituting with a part that has significantly lower bandwidth (e.g., <200MHz) or a narrower operating temperature range, which could cause system failure.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | UMW3157 | BL1551B | TMUX1219DCKR | TMUX1237DCKR | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SC70-6 | SC70-6 | SC70-6 | SC70-6 | SC70-6 — Package matches.; TMUX1219DCKR: Package matches.; TMUX1237DCKR: Package matches.; SN74LVC1G3157DCKR: Package matches. |
| Bandwidth | 350 MHz | 350 MHz | Unknown | Unknown | 350 MHz / Unknown / 300 MHz — Bandwidth matches.; TMUX1219DCKR: Bandwidth must be verified from datasheet.; TMUX1237DCKR: Bandwidth must be verified from datasheet.; SN74LVC1G3157DCKR: Slightly lower bandwidth. |
| Voltage | 1.65 V to 5.5 V | 1.8 V to 5.5 V | 1.08 V to 5.5 V | 1.08 V to 5.5 V | 1.8 V to 5.5 V / 1.08 V to 5.5 V / 1.65V to 5.5V — Minimum supply voltage is slightly higher.; TMUX1219DCKR: Wider supply voltage range is an upgrade.; TMUX1237DCKR: Wider supply voltage range is an upgrade.; SN74LVC1G3157DCKR: Supply voltage range matches. |
| Resistance | 3 Ω to 17 Ω | 2.7 Ω | 3 Ω Max | 3 Ω Max | 2.7 Ω / 3 Ω Max — On-resistance is better (lower).; TMUX1219DCKR: On-resistance is better (lower and specified max).; TMUX1237DCKR: On-resistance is better. |
| Temperature | -55°C to +125°C | - | - | - | -40°C to 85°C — Significantly narrower operating temperature range. |
| Manufacturer | UMW | - | - | - | UMW / Texas Instruments — Conflicting manufacturer data requires verification. |
Application & sourcing insights
Questions & answers
The BL1551B and Texas Instruments' TMUX12x9/TMUX12x7 series are strong candidates, offering similar or better performance in the same SC70-6 package. However, engineers must verify pinout, supply voltage range, and bandwidth for their specific application.