SMBJ8.5A-13 Transient Voltage Suppressor (TVS) Diode Equivalent & Substitute Parts

Part Overview

The SMBJ8.5A-13 is a unidirectional Zener transient voltage suppressor diode manufactured by Diodes Incorporated in the DO-214AA (SMB) surface mount package. This component is designed for general-purpose transient voltage suppression applications with an 8.5V reverse standoff voltage and 14.4V maximum clamping voltage. The SMBJ8.5A-13 is currently discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers with identical or comparable electrical characteristics and the same surface mount package configuration, ensuring direct board-level compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	8.5	V
Voltage - Breakdown (Min)	9.44	V
Voltage - Clamping (Max) @ Ipp	14.4	V
Current - Peak Pulse (10/1000µs)	41.7	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the SMBJ8.5A-13 are qualified based on the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 8.5V ± tolerance
Voltage - Breakdown (Min): 9.44V minimum
Voltage - Clamping (Max) @ Ipp: 14.4V to 18.6V range
Current - Peak Pulse (10/1000µs): 41A to 215A
Power - Peak Pulse: 600W
Package / Case: DO-214AA (SMB) surface mount
Mounting Type: Surface Mount
Type: Zener, Unidirectional (1 channel)
Operating Temperature: -55°C to 150°C minimum

Substitutes are grouped into two categories: direct electrical equivalents with identical clamping voltage (14.4V to 14.5V) and higher-performance variants with elevated clamping voltage (18.6V) that provide enhanced transient suppression capability while maintaining the same reverse standoff voltage and package footprint.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package / Case	Product Status	RoHS Status
SMBJ8.5A-13	Diodes Incorporated	8.5V	9.44V	14.4V	41.7A	600W	-55 to 150°C	DO-214AA, SMB	Discontinued	RoHS non-compliant
SMBJ8.5A-13-F	Diodes Incorporated	8.5V	9.44V	14.4V	41.7A	600W	-55 to 150°C	DO-214AA, SMB	Active	ROHS3 Compliant
P6SMB10A	Eaton - Electronics Division	8.55V	9.5V	14.5V	42.1A	600W	-55 to 150°C	DO-214AA, SMB	Active	RoHS Compliant
SM6T10A	STMicroelectronics	8.55V	9.5V	18.6V	215A (8/20µs)	600W	-55 to 150°C	DO-214AA, SMB	Active	ROHS3 Compliant
SM6T10A-E3/5B	Vishay General Semiconductor - Diodes Division	8.55V	9.5V	14.5V	41A	600W	-65 to 150°C	DO-214AA, SMB	Active	ROHS3 Compliant
SM6T10AY	STMicroelectronics	8.55V	9.5V	18.6V	215A (8/20µs)	600W	-55 to 150°C	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ8.5A	Taiwan Semiconductor Corporation	8.5V	9.44V	14.4V	43A	600W	-55 to 150°C	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ8V5A	Fairchild Semiconductor	8.5V	9.44V	14.4V	41.7A	600W	-55 to 150°C	DO-214AA, SMB	Active	Not specified

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitutes):

SMBJ8.5A-13-F (Diodes Incorporated) is the direct equivalent with identical electrical specifications and RoHS3 compliance. This part maintains active product status and is available in Tape & Reel packaging.

SMBJ8.5A (Taiwan Semiconductor Corporation) provides identical reverse standoff and clamping voltage with marginally higher peak pulse current (43A vs 41.7A) and active product status with RoHS3 compliance. High inventory availability supports production requirements.

Electrical Equivalents with Comparable Performance:

P6SMB10A (Eaton - Electronics Division) offers 0.05V higher reverse standoff voltage and 0.1V higher clamping voltage with marginally higher peak pulse current (42.1A). RoHS compliance and active status support modern supply chain requirements.

SM6T10A-E3/5B (Vishay General Semiconductor - Diodes Division) provides identical reverse standoff voltage with extended operating temperature range (-65°C to 150°C) and RoHS3 compliance. Clamping voltage is 0.1V higher; peak pulse current is 41A.

Higher-Performance Variants:

SM6T10A and SM6T10AY (STMicroelectronics) feature elevated clamping voltage (18.6V) and significantly higher peak pulse current (215A at 8/20µs), providing enhanced transient suppression margin. Both maintain RoHS3 compliance and active product status. SM6T10AY includes AEC-Q101 automotive qualification.

Compliance Considerations:

All recommended substitutes meet RoHS3 compliance requirements. The original SMBJ8.5A-13 is RoHS non-compliant; substitution with compliant alternatives aligns with modern regulatory requirements. All parts maintain REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can SMBJ8.5A-13-F be used as a direct replacement for SMBJ8.5A-13?

A: Yes. SMBJ8.5A-13-F is the direct equivalent with identical electrical specifications (8.5V reverse standoff, 14.4V clamping voltage, 41.7A peak pulse current) and the same DO-214AA (SMB) package. The primary difference is RoHS3 compliance and active product status. Tape & Reel packaging is standard.

Q: What is the difference between parts with 14.4V clamping voltage and 18.6V clamping voltage?

A: Parts with 18.6V clamping voltage (SM6T10A, SM6T10AY) provide higher transient suppression margin and significantly higher peak pulse current handling (215A vs 41-43A). These are suitable for applications requiring enhanced protection against larger transient events. The reverse standoff voltage (8.5V to 8.55V) remains compatible with the original specification.

Q: Are all substitute parts available in the same SMB package?

A: Yes. All listed substitutes use the DO-214AA (SMB) surface mount package, ensuring identical PCB footprint and reflow soldering compatibility. Packaging format (Tape & Reel, Cut Tape, or Bulk) varies by manufacturer and supplier but does not affect electrical performance or mechanical fit.

Q: Which substitute offers the widest operating temperature range?

A: SM6T10A-E3/5B (Vishay) operates from -65°C to 150°C, extending the lower temperature limit by 10°C compared to the original SMBJ8.5A-13 (-55°C to 150°C). This provides additional margin for extreme cold-environment applications.

Q: Is automotive-grade qualification available?

A: Yes. SM6T10AY (STMicroelectronics) carries AEC-Q101 automotive qualification, suitable for automotive and harsh-environment applications requiring formal qualification documentation.

Q: What inventory considerations apply to these substitutes?

A: SMBJ8.5A (Taiwan Semiconductor Corporation) offers the highest inventory availability (44,300 pcs). SMBJ8.5A-13-F (Diodes Incorporated) provides 4,300 pcs. SM6T10A (STMicroelectronics) and SM6T10A-E3/5B (Vishay) offer 15,230 and 3,915 pcs respectively. Inventory levels support both prototype and production-volume requirements.

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