GL12T-HG3-08 Equivalent & Substitute Parts

Part Overview

The GL12T-HG3-08 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for surface mount applications in SOT-23-3 packaging, providing 12V reverse standoff voltage with 24V clamping capability at 5A peak pulse current. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

GL12T-HG3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 1135GL12T-HG3-08 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 the GL12T-HG3-08 is determined by the following critical electrical and mechanical parameters:

Electrical Matching Criteria:

• Voltage - Reverse Standoff (Typ): 12V (Max)
• Voltage - Breakdown (Min): 13.3V minimum
• Voltage - Clamping (Max) @ Ipp: Must not exceed application tolerance
• Current - Peak Pulse (10/1000µs): 5A (8/20µs)
• Unidirectional configuration with single channel

Mechanical Matching Criteria:

• Package / Case: TO-236-3, SC-59, SOT-23-3 (surface mount)
• Mounting Type: Surface Mount
• Supplier Device Package: SOT-23-3 compatible footprint

Compliance Criteria:

• RoHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Two substitute parts meet these criteria with documented compatibility.

Parameter Comparison

Engineering Selection Recommendations

SL12.TCT (Semtech Corporation) provides the closest electrical match to the GL12T-HG3-08. Both parts share identical reverse standoff voltage (12V), breakdown voltage (13.3V), clamping voltage (24V), and peak pulse current (5A). The SL12.TCT is currently in active production status with unlimited moisture sensitivity rating. This part is suitable for direct substitution in applications where the original GL12T-HG3-08 specifications are required. The SL12.TCT operates across -55°C to 125°C, which covers the lower end of the GL12T-HG3-08 temperature range.

PESD12VU1UT,215 (Nexperia USA Inc.) is designated as the manufacturer-recommended alternative. This part maintains the same 12V reverse standoff voltage and 5A peak pulse current but exhibits a higher clamping voltage of 39V compared to the 24V specification of the GL12T-HG3-08. The PESD12VU1UT,215 is qualified to AEC-Q100 automotive standard with extended operating temperature range (-65°C to 150°C). This part is appropriate for applications where higher clamping voltage tolerance is acceptable and automotive-grade qualification is required. The lower capacitance (0.6pF) may be advantageous in high-frequency signal integrity applications.

Both substitute parts are ROHS3 compliant and available in active production status, ensuring long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can the SL12.TCT directly replace the GL12T-HG3-08 in all applications?

A: The SL12.TCT matches all critical electrical parameters of the GL12T-HG3-08 including reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse current. Both parts use identical SOT-23-3 packaging. The SL12.TCT is suitable for direct substitution in applications operating within the -55°C to 125°C temperature range. Applications requiring operation above 125°C should evaluate the PESD12VU1UT,215 alternative.

Q: What is the difference between the 24V and 39V clamping voltages?

A: Clamping voltage is the maximum voltage across the TVS diode when conducting peak pulse current. The GL12T-HG3-08 and SL12.TCT clamp at 24V, while the PESD12VU1UT,215 clamps at 39V. Selection depends on the protected circuit's voltage tolerance. Lower clamping voltage provides tighter protection but requires verification that the protected component can withstand the clamping level.

Q: Are all three parts automotive-qualified?

A: The GL12T-HG3-08 and PESD12VU1UT,215 carry automotive qualifications (AEC-Q101 and AEC-Q100 respectively). The SL12.TCT does not specify automotive qualification in the provided data. For applications requiring automotive-grade components, the PESD12VU1UT,215 is the appropriate choice.

Q: What is the significance of the capacitance difference between these parts?

A: Capacitance values (2.5pF, 5pF, and 0.6pF) affect high-frequency signal integrity. Lower capacitance reduces signal distortion in high-speed applications. The PESD12VU1UT,215 with 0.6pF capacitance is optimal for sensitive signal lines, while the SL12.TCT with 5pF is suitable for general-purpose transient suppression.

Q: Can these parts be used interchangeably in PCB designs?

A: All three parts use SOT-23-3 surface mount packaging with identical pin configurations. PCB footprints are compatible. However, electrical parameter differences (particularly clamping voltage) must be evaluated for each specific application before substitution.