Is there a pin-compatible replacement for PESD3V3S1BA-ES?

While several parts like SPD9103W share the same SOD-323 package and pinout, none are confirmed as direct drop-in replacements. Differences in clamping voltage, power rating, or capacitance require careful datasheet review before substitution.

What risks should I check before replacing PESD3V3S1BA-ES?

Key risks include: 1) Mismatched working voltage (must be 3.3V). 2) Lower peak pulse power, which reduces transient protection. 3) Different clamping voltage, affecting protection level. 4) Significant capacitance changes, which can impact high-speed signal integrity.

PESD3V3S1BA-ES Alternatives, Datasheet & Cross Reference | ElecSuper

PESD3V3S1BA-ES is a 3.3V bi-directional TVS diode in a SOD-323 package. When seeking alternatives, focus on matching the 3.3V working voltage, 360W power rating, and SOD-323 package. Key differences in capacitance and clamping voltage must be reviewed.

AI replacement insight

Electrical riskmedium

Candidates have different power, clamping voltage, or capacitance ratings.

Package risklow

All viable candidates share the same SOD-323 package.

Can it be replaced directly?

No direct drop-in replacement has been identified. All potential alternatives have parametric differences that require engineering review.

Best replacement path

SPD9103W is the most promising candidate, but requires review of its lower capacitance and higher clamping voltage.

Main risk

The main risks are insufficient transient protection from a lower power rating, or altered circuit performance due to significant differences in capacitance and clamping voltage.

Recommended alternatives

Matches package, voltage, and power rating, but has significantly different capacitance and clamping voltage.

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Alternative comparison matrix

Feature / factor	PESD3V3S1BA-ES	SPD9103W	TPGC03C	WS03DLC-B-ES	Compatibility / risk
Package	SOD-323	SOD-323	SOD-323	SOD-323	SOD-323 — Same package and pin count.; TPGC03C: Same package and pin count.; WS03DLC-B-ES: Same package and pin count.
Voltage	3.3V	3.3V	3.3V	3.3V	3.3V — Working voltage matches.; TPGC03C: Working voltage matches.; WS03DLC-B-ES: Working voltage matches.
Power	360W	350W	260W	200W	350W / 260W / 200W — Peak pulse power is nearly identical.; TPGC03C: Lower peak pulse power.; WS03DLC-B-ES: Significantly lower peak pulse power.
Capacitance	46 pF	1.0 pF	1 pF	1.2 pF	1.0 pF / 1 pF / 1.2 pF — Significantly lower capacitance, may affect circuit impedance.; TPGC03C: Significantly lower capacitance.; WS03DLC-B-ES: Significantly lower capacitance.
Clamping Voltage	7.0V @ 1A	9V @ 1A	5V @ 1A	-	9V @ 1A / 5V @ 1A — Higher clamping voltage offers less protection.; TPGC03C: Lower clamping voltage offers better protection.

Application & sourcing insights

Questions & answers

SPD9103W is a potential functional alternative. It matches the package, 3.3V working voltage, and has a similar 350W power rating, but its much lower capacitance and slightly higher clamping voltage require engineering review.