GL12T-HE3-18 Equivalent & Substitute Parts

Part Overview

The GL12T-HE3-18 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for surface mount applications in SOT-23-3 packaging. This component provides transient overvoltage protection with a 12V reverse standoff voltage and 24V clamping voltage at peak pulse current. The part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and procurement continuity.

Substiute Parts

GL12T-HE3-18

Vishay General Semiconductor - Diodes DivisionIn Stock: 963GL12T-HE3-18 Datasheet

Current PartRFQ

SL12.TCT

Semtech CorporationIn Stock: 44417SL12.TCT Datasheet

DirectRFQ

PESD12VU1UT,215

Nexperia USA Inc.In Stock: 12263PESD12VU1UT,215 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of TVS diodes is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): Must match or exceed 12V
• Voltage - Breakdown (Min): Must be within acceptable range (13.3V minimum)
• Voltage - Clamping (Max) @ Ipp: Must not exceed 24V to maintain circuit protection integrity
• Current - Peak Pulse: Must support minimum 5A (8/20µs)
• Package / Case: Must be compatible with SOT-23-3 footprint
• Mounting Type: Must be Surface Mount
• Operating Temperature Range: Must support -55°C ~ 150°C or equivalent

The substitute parts identified below meet these core electrical and mechanical requirements, enabling direct replacement in the circuit application.

Parameter Comparison

Engineering Selection Recommendations

SL12.TCT (Semtech Corporation) is the direct electrical equivalent, matching all critical voltage and current parameters with identical 24V clamping voltage and 300W peak pulse power rating. This part is currently in active production status with high inventory availability (44,400 pcs), ensuring procurement continuity. The primary consideration is the reduced upper operating temperature limit of 125°C (TJ) compared to the original 150°C specification.

PESD12VU1UT,215 (Nexperia USA Inc.) is an alternative substitute with automotive-grade qualification (AEC-Q100) and extended operating temperature range (-65°C ~ 150°C). However, this part exhibits a higher clamping voltage of 39V and reduced peak pulse power of 200W, which may affect circuit protection performance in applications requiring the original 24V clamping specification. This part is suitable only when the higher clamping voltage is acceptable within the circuit design.

Both substitute parts are ROHS3 compliant and available in the same SOT-23-3 surface mount package, enabling direct PCB footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can SL12.TCT be used as a direct replacement for GL12T-HE3-18?

A: SL12.TCT matches all critical electrical parameters including reverse standoff voltage (12V), breakdown voltage (13.3V), clamping voltage (24V), and peak pulse current (5A). Both parts use SOT-23-3 packaging. The primary difference is the maximum junction temperature of 125°C versus 150°C on the original part. Substitution is valid for applications where the circuit operates within -55°C to 125°C.

Q: What is the difference between SL12.TCT and PESD12VU1UT,215?

A: Both parts share the same 12V reverse standoff voltage and 5A peak pulse current rating. The key difference is clamping voltage: SL12.TCT clamps at 24V (matching the original), while PESD12VU1UT,215 clamps at 39V. Additionally, PESD12VU1UT,215 has automotive-grade qualification (AEC-Q100) and extended temperature range (-65°C ~ 150°C), but reduced peak pulse power (200W versus 300W).

Q: Are all three parts compatible with the same PCB footprint?

A: Yes. GL12T-HE3-18, SL12.TCT, and PESD12VU1UT,215 all use SOT-23-3 surface mount packaging, enabling direct footprint compatibility without PCB redesign.

Q: Which substitute part should be selected for automotive applications?

A: PESD12VU1UT,215 carries automotive-grade qualification (AEC-Q100) and is suitable for automotive environments. SL12.TCT does not specify automotive qualification. However, the original GL12T-HE3-18 carries AEC-Q101 qualification, which is a higher automotive standard than AEC-Q100.

Q: What is the impact of the different clamping voltages on circuit protection?

A: Clamping voltage determines the maximum voltage the TVS diode allows across the protected circuit during a transient event. GL12T-HE3-18 and SL12.TCT both clamp at 24V, providing identical protection. PESD12VU1UT,215 clamps at 39V, allowing higher transient voltages to reach the protected circuit. Selection depends on the maximum allowable voltage the downstream components can withstand.

Q: Is the reduced peak pulse power of PESD12VU1UT,215 a concern?

A: PESD12VU1UT,215 has 200W peak pulse power versus 300W on the original part. This reduction may limit the maximum transient energy the diode can dissipate. Substitution is valid only if the circuit's transient energy profile does not exceed 200W.