SMBJ8.5-E3/52 Equivalent & Substitute Parts

Part Overview

The SMBJ8.5-E3/52 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 8.5V reverse standoff voltage class and is designed for general-purpose transient protection applications. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMBJ8.5-E3/52
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	8.5V
Voltage - Breakdown (Min)	9.44V
Voltage - Clamping (Max) @ Ipp	15.9V
Current - Peak Pulse (10/1000µs)	37.7A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 150°C (TJ)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the SMBJ8.5-E3/52 is determined by the following critical parameters:

Reverse Standoff Voltage (Typ): 8.5V ± tolerance
Voltage - Clamping (Max) @ Ipp: 15.9V or lower (lower clamping voltage provides better protection margin)
Current - Peak Pulse (10/1000µs): 37.7A or higher (equal or greater current handling capability)
Power - Peak Pulse: 600W (standard for this package class)
Package / Case: DO-214AA / SMB (surface mount compatibility)
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C minimum

Substitute parts are grouped into two categories:

Category A - Direct Vishay/Microchip Equivalents: Parts with identical reverse standoff voltage (8.5V) and matching or superior electrical characteristics. These provide the closest functional replacement.

Category B - Cross-Manufacturer Alternatives: Parts from Eaton, STMicroelectronics, MDD, Taiwan Semiconductor Corporation, and Diodes Incorporated with 8.5V standoff voltage or near-equivalent voltage classes (8.55V). These maintain functional compatibility within the application's transient protection requirements.

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ)	Vc (Max) @ Ipp	Ipp (10/1000µs)	Package	Status
SMBJ8.5-E3/52	Vishay	8.5V	15.9V	37.7A	DO-214AA	Obsolete
SMBJ8.5A-E3/52	Vishay	8.5V	14.4V	41.7A	DO-214AA	Active
SMBJ8.5E3/TR13	Microchip Technology	8.5V	15.9V	37.7A	DO-214AA	Active
P6SMB10A	Eaton	8.55V	14.5V	42.1A	DO-214AA	Active
SM6T10A	STMicroelectronics	8.55V	18.6V	215A (8/20µs)	DO-214AA	Active
SM6T10AY	STMicroelectronics	8.55V	18.6V	215A (8/20µs)	DO-214AA	Active
SMBJ10A	MDD	10V	17V	35.3A	DO-214AA	Active
SMBJ8.5A	Taiwan Semiconductor Corporation	8.5V	14.4V	43A	DO-214AA	Active
SMBJ8.5A-13-F	Diodes Incorporated	8.5V	14.4V	41.7A	DO-214AA	Active

Engineering Selection Recommendations

Tier 1 - Preferred Substitutes (Identical Electrical Characteristics)

SMBJ8.5E3/TR13 (Microchip Technology) is the primary recommended substitute. It maintains identical reverse standoff voltage (8.5V), clamping voltage (15.9V), and peak pulse current (37.7A) as the original SMBJ8.5-E3/52. The part is active in production, ROHS3 compliant, and operates across the same temperature range (-55°C to 150°C). The extended operating temperature range to -65°C provides additional margin.

SMBJ8.5A-E3/52 (Vishay) is a direct Vishay alternative within the same product family. While clamping voltage is reduced to 14.4V and peak pulse current increased to 41.7A, these characteristics remain within acceptable substitution parameters for the 8.5V standoff class. Active production status and identical RoHS compliance support this selection.

Tier 2 - Compatible Substitutes (8.5V Standoff Class)

SMBJ8.5A (Taiwan Semiconductor Corporation) and SMBJ8.5A-13-F (Diodes Incorporated) both maintain 8.5V reverse standoff voltage with 14.4V clamping voltage and peak pulse currents of 43A and 41.7A respectively. Both are active, ROHS3 compliant, and suitable for general-purpose applications.

Tier 3 - Near-Equivalent Alternatives (8.55V Standoff Class)

P6SMB10A (Eaton) and SM6T10A/SM6T10AY (STMicroelectronics) operate at 8.55V reverse standoff voltage, representing a 0.65% deviation from the original specification. These parts are suitable where the application tolerance permits slight voltage class variation. SM6T10AY includes AEC-Q101 automotive qualification.

Not Recommended for Direct Substitution

SMBJ10A (MDD) operates at 10V reverse standoff voltage, representing a 17.6% increase from the original 8.5V specification. This part is outside the acceptable substitution range for the 8.5V class and should not be used as a direct replacement.

Frequently Asked Questions (FAQ)

Q: Can SMBJ8.5A-E3/52 be used as a direct replacement for SMBJ8.5-E3/52?

A: Yes. Both parts maintain 8.5V reverse standoff voltage and 600W peak pulse power rating in DO-214AA packaging. The SMBJ8.5A-E3/52 features lower clamping voltage (14.4V vs. 15.9V) and higher peak pulse current (41.7A vs. 37.7A), providing improved transient suppression performance. Active production status makes this the preferred Vishay substitute.

Q: What is the difference between SMBJ8.5E3/TR13 and SMBJ8.5-E3/52?

A: SMBJ8.5E3/TR13 is manufactured by Microchip Technology and maintains identical electrical specifications (8.5V standoff, 15.9V clamping, 37.7A peak pulse). The primary difference is manufacturer and packaging format (Tape & Reel vs. bulk). Both are ROHS3 compliant and suitable for equivalent circuit protection.

Q: Can SM6T10A substitute for SMBJ8.5-E3/52?

A: SM6T10A operates at 8.55V reverse standoff voltage (0.65% higher than 8.5V) and features higher clamping voltage (18.6V) with significantly higher peak pulse current (215A at 8/20µs). This part is functionally compatible for general-purpose transient protection but operates outside the original 8.5V voltage class. Use only where application design permits 8.55V standoff voltage operation.

Q: Is SMBJ10A compatible with SMBJ8.5-E3/52?

A: No. SMBJ10A operates at 10V reverse standoff voltage, which is 17.6% higher than the original 8.5V specification. This voltage class difference places it outside acceptable substitution parameters and may result in inadequate transient protection in circuits designed for 8.5V operation.

Q: What packaging formats are available for substitute parts?

A: All substitute parts are supplied in DO-214AA (SMB) surface mount package, maintaining mechanical and electrical compatibility with the original SMBJ8.5-E3/52. Packaging options include bulk, Tape & Reel (TR), and Cut Tape (CT) formats depending on manufacturer and part number variant.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of the original SMBJ8.5-E3/52. Moisture Sensitivity Level (MSL) is 1 (Unlimited) across all parts, indicating no moisture sensitivity restrictions.

Q: What is the operating temperature range for substitute parts?

A: All substitute parts operate across -55°C to 150°C (TJ) minimum, matching or exceeding the original specification. SMBJ8.5E3/TR13 extends to -65°C, providing additional low-temperature margin.

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