SMBJ8.5C-E3/52 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ8.5C-E3/52 is a bidirectional Zener transient voltage suppressor diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the DO-214AA (SMB) package and is designed for general-purpose transient voltage suppression applications. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The SMBJ8.5C-E3/52 features a reverse standoff voltage of 8.5V, a breakdown voltage minimum of 9.44V, and a clamping voltage of 15.9V at peak pulse current. With a peak pulse current rating of 37.7A (10/1000µs) and peak pulse power of 600W, this component provides robust protection against transient overvoltage events in surface mount applications.

Key Parameters

Parameter	Value	Unit
Manufacturer	Vishay General Semiconductor - Diodes Division	—
Part Number	SMBJ8.5C-E3/52	—
Category	Transient Voltage Suppressors (TVS)	—
Series	TransZorb®	—
Type	Zener	—
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Bidirectional Channels	1	—
Voltage - Reverse Standoff (Typ)	8.5	V
Voltage - Breakdown (Min)	9.44	V
Voltage - Clamping (Max) @ Ipp	15.9	V
Current - Peak Pulse (10/1000µs)	37.7	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C (TJ)
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—
Part Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the SMBJ8.5C-E3/52 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

Reverse Standoff Voltage (Typ): 8.5V ± tolerance
Breakdown Voltage (Min): 9.44V minimum
Package / Case: DO-214AA or SMB equivalent
Mounting Type: Surface Mount
Bidirectional Channels: 1
Type: Zener
RoHS Compliance: ROHS3 Compliant

Secondary Consideration Parameters:

Clamping Voltage (Max) @ Ipp: 14.4V to 19.5V range acceptable
Current - Peak Pulse (10/1000µs): 37.7A to 42.1A range acceptable
Operating Temperature Range: -55°C to 150°C minimum
Power - Peak Pulse: 600W

Substitute parts must maintain the same reverse standoff voltage and breakdown voltage specifications to ensure proper circuit protection. Variations in clamping voltage and peak pulse current within the specified ranges do not compromise substitutability for general-purpose transient suppression applications. All substitute parts listed are active products with current manufacturing status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ) [V]	Voltage - Breakdown (Min) [V]	Voltage - Clamping (Max) @ Ipp [V]	Current - Peak Pulse (10/1000µs) [A]	Operating Temperature [°C]	Package	Status
SMBJ8.5C-E3/52	Vishay	8.5	9.44	15.9	37.7	-55 to 150	DO-214AA (SMB)	Obsolete
SMBJ8.5CA-E3/52	Vishay	8.5	9.44	14.4	41.7	-55 to 150	DO-214AA (SMB)	Active
SMBJ8.5CE3/TR13	Microchip Technology	8.5	9.44	15.9	37.7	-65 to 150	SMBJ (DO-214AA)	Active
P6SMB10CA	Eaton - Electronics Division	8.55	9.5	14.5	42.1	-55 to 150	DO-214AA (SMB)	Active
SM6T10CA	STMicroelectronics	8.55	9.5	18.6	215 (8/20µs)	-55 to 150	DO-214AA (SMB)	Active
SM6T10CAY	STMicroelectronics	8.55	9.5	18.6	215 (8/20µs)	-55 to 150	DO-214AA (SMB)	Active
SMBJ8.5CA	EVVO Semi	8.5	9.44	14.4	41.7	-65 to 150	DO-214AA (SMB)	Active
SMBJ8.5CA-13-F	Diodes Incorporated	8.5	9.44	14.4	41.7	-55 to 150	DO-214AA (SMB)	Active
SMBJ8.5CA-TR	STMicroelectronics	8.5	9.4	19.5	41.7	-55 to 150	DO-214AA (SMB)	Active
SMBJ8.5CAE3/TR13	Microchip Technology	8.5	9.44	14.4	41.7	-65 to 150	SMBJ (DO-214AA)	Active
SMBJ8V5CA	Fairchild Semiconductor	8.5	9.44	14.4	41.7	-55 to 150	DO-214AA (SMB)	Active

Engineering Selection Recommendations

Primary Substitute (Highest Compatibility): SMBJ8.5CA-E3/52 (Vishay) is the direct active equivalent. This part maintains identical reverse standoff voltage (8.5V) and breakdown voltage (9.44V) specifications. The clamping voltage is reduced from 15.9V to 14.4V, and peak pulse current is increased from 37.7A to 41.7A. Both parameters remain within acceptable substitution ranges for general-purpose transient suppression. This part is manufactured by the same original equipment manufacturer and carries ROHS3 compliance with unlimited moisture sensitivity rating.

Secondary Substitutes (Electrical Equivalence with Extended Temperature Range): SMBJ8.5CE3/TR13 (Microchip Technology) and SMBJ8.5CAE3/TR13 (Microchip Technology) provide active product status with extended operating temperature range (-65°C to 150°C versus -55°C to 150°C). SMBJ8.5CE3/TR13 matches the original clamping voltage specification (15.9V) and peak pulse current (37.7A) exactly. SMBJ8.5CAE3/TR13 provides the reduced clamping voltage variant (14.4V) with increased peak pulse current (41.7A).

Alternative Substitutes (Voltage Tolerance Variation): P6SMB10CA (Eaton), SM6T10CA (STMicroelectronics), and SM6T10CAY (STMicroelectronics) maintain reverse standoff voltage within 0.05V tolerance (8.55V versus 8.5V) and breakdown voltage within 0.06V tolerance (9.5V versus 9.44V). These parts are suitable for applications where minor voltage tolerance variations are acceptable. SM6T10CAY carries AEC-Q101 automotive qualification and is recommended for automotive-grade applications.

Tertiary Substitutes (Same Manufacturer, Alternative Packaging): SMBJ8.5CA (EVVO Semi), SMBJ8.5CA-13-F (Diodes Incorporated), SMBJ8.5CA-TR (STMicroelectronics), and SMBJ8V5CA (Fairchild Semiconductor) provide active product status with identical or near-identical electrical specifications. These parts are available in alternative packaging configurations (Cut Tape, Bulk, or Tape & Reel variants) and from multiple manufacturers, ensuring supply chain flexibility.

All substitute parts listed carry ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), meeting environmental and reliability requirements equivalent to the original part.

Frequently Asked Questions (FAQ)

Q1: Can SMBJ8.5CA-E3/52 directly replace SMBJ8.5C-E3/52 in my circuit?

A: Yes. SMBJ8.5CA-E3/52 is a direct active equivalent manufactured by Vishay. Both parts maintain 8.5V reverse standoff voltage and 9.44V minimum breakdown voltage. The clamping voltage decreases from 15.9V to 14.4V, and peak pulse current increases from 37.7A to 41.7A. These variations remain within acceptable substitution parameters for general-purpose transient suppression applications.

Q2: What is the difference between SMBJ8.5CE3/TR13 and SMBJ8.5CAE3/TR13?

A: Both are Microchip Technology products in SMBJ (DO-214AA) package with extended temperature range (-65°C to 150°C). SMBJ8.5CE3/TR13 maintains the original clamping voltage (15.9V) and peak pulse current (37.7A). SMBJ8.5CAE3/TR13 provides reduced clamping voltage (14.4V) with increased peak pulse current (41.7A). Selection depends on your circuit's specific clamping voltage requirement.

Q3: Are SM6T10CA and SM6T10CAY interchangeable?

A: Both parts are STMicroelectronics TRANSIL™ series with identical electrical specifications (8.55V standoff, 18.6V clamping, 215A peak pulse current at 8/20µs). The primary difference is that SM6T10CAY carries AEC-Q101 automotive qualification. SM6T10CAY is required for automotive applications; SM6T10CA is suitable for general-purpose and industrial applications.

Q4: Why do some substitute parts have different peak pulse current ratings?

A: Peak pulse current varies based on manufacturer design and test conditions. The original SMBJ8.5C-E3/52 specifies 37.7A at 10/1000µs pulse duration. Substitutes like SMBJ8.5CA-E3/52 increase this to 41.7A, while SM6T10CA specifies 215A at 8/20µs pulse duration. All variants maintain 600W peak pulse power rating. Selection should match your circuit's actual transient pulse characteristics.

Q5: Can I use P6SMB10CA if my design requires 8.5V standoff voltage?

A: P6SMB10CA operates at 8.55V standoff voltage, a 0.05V variation from the original 8.5V specification. This tolerance is within typical component manufacturing ranges and is acceptable for most general-purpose transient suppression circuits. Verify your circuit design margin before substitution if precise voltage matching is critical.

Q6: What packaging options are available for SMBJ8.5 series substitutes?

A: Substitute parts are available in multiple packaging configurations: Tape & Reel (TR) for automated assembly, Cut Tape (CT) for manual or semi-automated processes, and Bulk for high-volume applications. All maintain DO-214AA (SMB) physical package dimensions for PCB compatibility. Verify your procurement and assembly process requirements when selecting packaging variant.

Q7: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification. All parts also maintain MSL 1 (Unlimited) moisture sensitivity rating, indicating no special moisture control requirements during storage or handling.

Q8: Which substitute offers the best long-term availability?

A: SMBJ8.5CA-E3/52 (Vishay) and SMBJ8.5CAE3/TR13 (Microchip Technology) are recommended for long-term availability. Both manufacturers maintain active product status with high inventory levels (60,100 and 985 units respectively). Microchip's extended temperature range (-65°C to 150°C) provides additional design margin for temperature-sensitive applications.

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