1SMB8.0AT3 Equivalent & Substitute Parts

Part Overview

The 1SMB8.0AT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface mount applications. This component features an 8V reverse standoff voltage with a 13.6V maximum clamping voltage and 44.1A peak pulse current capability in the SMB (DO-214AA) package. The part is currently obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	8	V
Voltage - Breakdown (Min)	8.89	V
Voltage - Clamping (Max) @ Ipp	13.6	V
Current - Peak Pulse (10/1000µs)	44.1	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Unidirectional Channels	1	—
Capacitance @ 1MHz	1780	pF

Substitute Part Grouping Explanation

Substitute parts for the 1SMB8.0AT3 are classified based on strict electrical and mechanical parameter alignment:

Direct Substitutes (Electrical & Mechanical Equivalence): Parts meeting all critical parameters: 8V reverse standoff voltage, 8.89V minimum breakdown voltage, 13.6V maximum clamping voltage, 44.1–44.2A peak pulse current, 600W peak pulse power, DO-214AA/SMB package, and surface mount configuration. These parts are interchangeable in circuit designs without modification.

Similar Substitutes (Acceptable Parameter Variance): Parts with matching voltage ratings and package but differing in peak pulse current or power dissipation. The SACB8.0 operates at 36A peak pulse (500W), and the SMB10J8.0A variants operate at 74.6A peak pulse (1000W). These are suitable where the application can tolerate higher or lower current handling capability within the same voltage class.

Key Parameters Determining Substitution:

Reverse standoff voltage: 8V (fixed)
Breakdown voltage range: 8.89V minimum (fixed)
Clamping voltage: 13.6V maximum (fixed for direct substitutes; 13.4V acceptable for similar)
Peak pulse current: 44.1A nominal (44.2A acceptable; 36A or 74.6A for similar applications)
Package: DO-214AA/SMB (mandatory)
Mounting: Surface mount (mandatory)
Unidirectional channels: 1 (fixed)

Parameter Comparison

Part Number	Manufacturer	Vwm (V)	Vbr (Min, V)	Vc (Max, V)	Ipp (A)	Ppk (W)	Tj Range (°C)	Package	Status	RoHS
1SMB8.0AT3	onsemi	8	8.89	13.6	44.1	600	-65 to 150	DO-214AA, SMB	Obsolete	Non-compliant
SMBJ8.0A	MDD	8	8.89	13.6	44.2	600	-50 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
SACB8.0	Littelfuse Inc.	8	8.89	13.4	36	500	-55 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
SMB10J8.0A-M3/52	Vishay General Semiconductor - Diodes Division	8	8.89	13.6	74.6	1000	-55 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
SMB10J8.0A-M3/5B	Vishay General Semiconductor - Diodes Division	8	8.89	13.6	74.6	1000	-55 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ8.0A-13-F	Diodes Incorporated	8	8.89	13.6	44.1	600	-55 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ8.0A-HRA	Littelfuse Inc.	8	8.89	13.6	44.2	600	-65 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ8.0A-M3/52	Vishay General Semiconductor - Diodes Division	8	8.89	13.6	44.1	600	-55 to 150	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ8.0A-M3/5B	Vishay General Semiconductor - Diodes Division	8	8.89	13.6	44.1	600	-55 to 150	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Electrical & Mechanical Equivalence): SMBJ8.0A (MDD), SMBJ8.0A-13-F (Diodes Incorporated), SMBJ8.0A-HRA (Littelfuse Inc.), SMBJ8.0A-M3/52 (Vishay), and SMBJ8.0A-M3/5B (Vishay) are functionally equivalent to the 1SMB8.0AT3. All maintain 8V reverse standoff, 13.6V clamping voltage, and 44.1–44.2A peak pulse current. All substitute parts are ROHS3 compliant and carry active product status, eliminating obsolescence risk. The SMBJ8.0A-HRA extends the operating temperature range to -65°C, matching the original part's lower temperature limit.

For Applications Tolerating Current Variance: The SACB8.0 (Littelfuse Inc.) operates at 36A peak pulse current with 13.4V clamping voltage. This part is suitable for applications where lower transient current handling is acceptable. The SMB10J8.0A-M3/52 and SMB10J8.0A-M3/5B (Vishay) provide enhanced current handling at 74.6A peak pulse and 1000W power dissipation, appropriate for high-energy transient environments.

Compliance & Availability: All active substitute parts comply with ROHS3 standards. The original 1SMB8.0AT3 is RoHS non-compliant and obsolete. Transition to any active substitute ensures regulatory compliance and supply chain continuity. Inventory availability ranges from 705 to 26,100 units across substitute options.

Frequently Asked Questions (FAQ)

Q: Can I use SMBJ8.0A as a direct replacement for 1SMB8.0AT3? A: Yes. The SMBJ8.0A maintains identical voltage ratings (8V standoff, 13.6V clamping), equivalent peak pulse current (44.2A vs. 44.1A), and identical package (DO-214AA/SMB). It is electrically and mechanically interchangeable.

Q: What is the difference between direct substitutes and similar substitutes? A: Direct substitutes match all critical electrical parameters (voltage, current, power) and package specifications. Similar substitutes maintain voltage compatibility but differ in peak pulse current or clamping voltage within acceptable ranges for the 8V class. SACB8.0 and SMB10J8.0A variants are similar substitutes.

Q: Is the SACB8.0 suitable for my application? A: The SACB8.0 is suitable if your circuit can operate with 36A peak pulse current (versus 44.1A) and 13.4V clamping voltage (versus 13.6V). Both values remain within the 8V TVS diode class. Verify your transient energy requirements before selection.

Q: Do all substitute parts have the same operating temperature range? A: No. The original 1SMB8.0AT3 operates from -65°C to 150°C. Most substitutes operate from -55°C to 150°C. The SMBJ8.0A-HRA matches the original -65°C lower limit. Confirm your application's temperature requirements before final selection.

Q: Are all substitute parts RoHS compliant? A: Yes. All active substitute parts listed are ROHS3 compliant. The original 1SMB8.0AT3 is RoHS non-compliant. Transition to any substitute ensures regulatory compliance for new designs and production.

Q: What packaging options are available? A: All substitute parts use the DO-214AA (SMB) surface mount package, identical to the original. Packaging variants (Tape & Reel, Cut Tape) differ by supplier but do not affect electrical or mechanical compatibility.

Q: Can I use SMB10J8.0A variants for standard applications? A: Yes. The SMB10J8.0A-M3/52 and SMB10J8.0A-M3/5B provide higher current handling (74.6A) and power dissipation (1000W) than the original. They are suitable for all applications requiring 8V TVS protection and offer enhanced margin for high-energy transients.

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