SMBJ8.0-E3/52 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The SMBJ8.0-E3/52 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division in the DO-214AA (SMB) surface mount package. This component is rated for 8V reverse standoff voltage with a 15V maximum clamping voltage at peak pulse current of 40A and 600W peak pulse power dissipation. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	8V	V
Breakdown Voltage (Min)	8.89V	V
Clamping Voltage (Max) @ Ipp	15V	V
Peak Pulse Current (10/1000µs)	40A	A
Peak Pulse Power	600W	W
Operating Temperature Range	-55°C to 150°C	°C (TJ)
Package Type	DO-214AA (SMB)	Surface Mount
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution for the SMBJ8.0-E3/52 is determined by the following critical parameters:

Reverse Standoff Voltage: Must be 8V (±tolerance as specified by manufacturer)
Breakdown Voltage (Min): Must be 8.89V or higher
Clamping Voltage (Max) @ Ipp: Acceptable range 13.6V to 15V
Peak Pulse Current: Minimum 40A at 10/1000µs pulse
Peak Pulse Power: 600W minimum
Package Type: DO-214AA (SMB) surface mount only
Unidirectional Configuration: Single channel Zener type
Compliance: ROHS3 compliant, MSL 1

Substitute parts are grouped into two categories:

Direct Electrical Equivalents (identical clamping voltage 15V, 40A peak current):

SMBJ8.0E3/TR13 (Microchip Technology)

Functional Equivalents (8V standoff, lower clamping voltage 13.6V, higher peak current 44.1–44.2A):

SMBJ8.0A-E3/52 (Vishay General Semiconductor - Diodes Division)
SMBJ8.0A-13-F (Diodes Incorporated)
SMBJ8.0A (MDD)
SMBJ8V0A (Fairchild Semiconductor)

Higher Voltage Alternative (10V standoff, 17V clamping, 35.3A peak current):

SMBJ10A (MDD)

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Operating Temp (°C)	Package	Product Status
SMBJ8.0-E3/52	Vishay	8	8.89	15	40	600	-55 to 150	DO-214AA	Obsolete
SMBJ8.0E3/TR13	Microchip	8	8.89	15	40	600	-65 to 150	DO-214AA	Active
SMBJ8.0A-E3/52	Vishay	8	8.89	13.6	44.1	600	-55 to 150	DO-214AA	Active
SMBJ8.0A-13-F	Diodes Inc.	8	8.89	13.6	44.1	600	-55 to 150	DO-214AA	Active
SMBJ8.0A	MDD	8	8.89	13.6	44.2	600	-50 to 150	DO-214AA	Active
SMBJ8V0A	Fairchild	8	8.89	13.6	44.1	600	-55 to 150	DO-214AA	Active
SMBJ10A	MDD	10	11	17	35.3	600	-50 to 150	DO-214AA	Active

Engineering Selection Recommendations

First Choice for Direct Replacement: SMBJ8.0E3/TR13 (Microchip Technology) provides identical electrical performance to the obsolete SMBJ8.0-E3/52 with matching 8V standoff, 15V clamping voltage, and 40A peak pulse current. This part is active in production, ROHS3 compliant, and extends the operating temperature range to -65°C, offering improved thermal margin. Tape & Reel packaging supports automated assembly.

Preferred Functional Equivalent: SMBJ8.0A-E3/52 (Vishay General Semiconductor - Diodes Division) maintains the same manufacturer lineage as the original part with identical standoff voltage and breakdown characteristics. The reduced clamping voltage (13.6V vs. 15V) and increased peak pulse current (44.1A vs. 40A) provide enhanced transient suppression capability within the same power envelope. Active product status and ROHS3 compliance ensure long-term availability.

Alternative Functional Equivalents: SMBJ8.0A-13-F (Diodes Incorporated), SMBJ8.0A (MDD), and SMBJ8V0A (Fairchild Semiconductor) all meet the 8V standoff requirement with 13.6V clamping and 44.1–44.2A peak current ratings. These parts are suitable where design flexibility permits the lower clamping voltage specification. All are ROHS3 compliant and actively produced.

Higher Voltage Alternative: SMBJ10A (MDD) is applicable only when circuit design permits a 10V standoff voltage and 17V clamping voltage. This part is not a direct substitute but may be considered for applications with higher transient voltage tolerance. Peak pulse current is reduced to 35.3A.

All recommended substitutes maintain DO-214AA (SMB) surface mount packaging, single-channel unidirectional Zener configuration, 600W peak pulse power rating, and ROHS3 compliance with MSL 1 moisture sensitivity.

Frequently Asked Questions (FAQ)

Q: Can SMBJ8.0A-E3/52 replace SMBJ8.0-E3/52 directly? A: Yes. Both parts share identical 8V reverse standoff voltage and 8.89V minimum breakdown voltage. The SMBJ8.0A-E3/52 has a lower clamping voltage (13.6V vs. 15V) and higher peak pulse current (44.1A vs. 40A), providing superior transient suppression within the same 600W power rating. This is a functional upgrade suitable for direct PCB substitution.

Q: Why does SMBJ8.0E3/TR13 have a wider operating temperature range? A: SMBJ8.0E3/TR13 (Microchip) specifies -65°C to 150°C versus -55°C to 150°C for the original part. This extended lower temperature limit provides additional design margin for applications in harsh environments. The electrical performance at rated conditions remains identical.

Q: Is SMBJ10A a suitable substitute? A: SMBJ10A is not a direct substitute. It operates at 10V reverse standoff (versus 8V) with 17V clamping voltage and 35.3A peak current. Use this part only if circuit design explicitly permits higher standoff and clamping voltages. Substitution requires design review.

Q: Are all substitute parts available in the same package? A: Yes. All listed substitute parts use DO-214AA (SMB) surface mount packaging with identical PCB footprint and land pattern compatibility. No layout modifications are required for mechanical substitution.

Q: What is the difference between tape & reel and bulk packaging? A: Tape & reel packaging is suitable for automated pick-and-place assembly and is standard for production environments. Bulk packaging is typically used for manual assembly or lower-volume applications. Electrical performance is identical; packaging affects procurement and assembly process only.

Q: Do all substitutes meet RoHS and REACH compliance? A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level) and REACH unaffected status, matching the compliance profile of the original SMBJ8.0-E3/52.

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