Is there a pin-compatible replacement for SD12C.TCT?

Several parts like the MDD SD12C use the same SOD-323 package and are likely pin-compatible. However, it is crucial to verify the datasheet's land pattern and pinout before board layout or assembly.

What risks should I check before replacing SD12C.TCT?

Verify the replacement has a bidirectional configuration, a 12V working voltage, and a clamping voltage equal to or lower than the original's 24V. Also check that the peak power/current ratings are sufficient and that the junction capacitance is suitable for your circuit's operating frequency.

SD12C.TCT Alternatives, Datasheet & Cross Reference | SEMTECH

Semtech's SD12C.TCT is a 12V bidirectional TVS diode in a SOD-323 package for ESD protection. Finding a replacement requires matching the package, 12V working voltage, and bidirectional configuration.

AI replacement insight

Electrical riskhigh

Clamping voltage and capacitance must be verified for the application.

Package risklow

SOD-323 is a standard package, but land pattern should be checked.

Can it be replaced directly?

Yes, several functional alternatives exist for the SD12C.TCT. The MDD SD12C is a strong candidate with matching key specifications. Other options may offer upgraded performance but require careful review of clamping voltage and capacitance.

Best replacement path

The best replacement path is finding another 12V bidirectional TVS in a SOD-323 package, like the MDD SD12C, which offers very similar parameters.

Main risk

The main risk is mismatching the clamping voltage, which could fail to protect the circuit. Polarity (bidirectional) must also be matched.

Recommended alternatives

Upgrade option with better clamping voltage and very low capacitance for high-speed interfaces.

View details

Alternative comparison matrix

Feature / factor	SD12C.TCT	SD12C	UDD32C12L01-ES	H12VND3B	Compatibility / risk
Package	SOD-323	SOD-323	SOD-323	SOD-323	SOD-323 — Same package ensures form-fit compatibility.; UDD32C12L01-ES: Same package ensures form-fit compatibility.; H12VND3B: Same package ensures form-fit compatibility.
Polarity Or Type	Bidirectional	Bi-directional	Bidirectional	Bi-directional	Bi-directional / Bidirectional — Matches required bidirectional protection.; UDD32C12L01-ES: Matches required bidirectional protection.; H12VND3B: Matches required bidirectional protection.
Voltage V	12.0V	12.0V	12.0V	12.0V	12.0V — Matches the target's working voltage.; UDD32C12L01-ES: Matches the target's working voltage.; H12VND3B: Matches the target's working voltage.
Power W	350.0W	350.0W	-	-	350.0W — Matches peak pulse power rating.
Current A	15.0A	16.0A	-	35.0A	16.0A / 35.0A — Higher peak pulse current rating is acceptable.; H12VND3B: Higher current rating provides more surge capability.
Clamping Voltage	24V	-	17V	36V @ 35A	17V / 36V @ 35A — Lower clamping voltage offers better protection.; H12VND3B: Higher clamping voltage offers less protection.
Capacitance	100pF	-	0.8pF	-	0.8pF — Extremely low capacitance, suitable for high-speed lines.

Application & sourcing insights

Questions & answers

The MDD SD12C is a strong candidate, offering nearly identical specifications in the same SOD-323 package. For high-speed applications, the ElecSuper UDD32C12L01-ES is a potential upgrade with much lower capacitance.