SMBJ8.0 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ8.0 is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features an 8V reverse standoff voltage with a 14.28V maximum clamping voltage at peak pulse current, housed in a DO-214AA (SMB) package.

The SMBJ8.0 is classified as obsolete. Identifying qualified substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	8	V
Voltage - Breakdown (Min)	8.42	V
Voltage - Clamping (Max) @ Ipp	14.28	V
Current - Peak Pulse (10/1000µs)	44.2	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMBJ8.0 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must equal 8V
Voltage - Clamping (Max) @ Ipp: Must not exceed 14.28V (lower values acceptable within circuit tolerance)
Current - Peak Pulse (10/1000µs): Must equal or exceed 44.2A
Power - Peak Pulse: Must equal or exceed 600W
Package / Case: Must be DO-214AA or SMB equivalent
Mounting Type: Must be Surface Mount
Unidirectional Channels: Must equal 1
RoHS Status: Must maintain ROHS3 Compliance

All identified substitute parts meet these criteria and are classified as Active products, ensuring long-term availability and supply chain stability compared to the obsolete SMBJ8.0.

Parameter Comparison

Parameter	SMBJ8.0 (Littelfuse)	SMBJ8.0A (MDD)	SMBJ8.0A-13-F (Diodes Inc.)	SMBJ8.0A-E3/5B (Vishay)	SMBJ8V0A (Fairchild)
Voltage - Reverse Standoff (Typ)	8V	8V	8V	8V	8V
Voltage - Breakdown (Min)	8.42V	8.89V	8.89V	8.89V	8.89V
Voltage - Clamping (Max) @ Ipp	14.28V	13.6V	13.6V	13.6V	13.6V
Current - Peak Pulse (10/1000µs)	44.2A	44.2A	44.1A	44.1A	44.1A
Power - Peak Pulse	600W	600W	600W	600W	600W
Operating Temperature Range	-65 to 150°C	-50 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

All four substitute parts are functionally equivalent to the SMBJ8.0 based on electrical parameters. Selection should prioritize the following factors:

SMBJ8.0A (MDD): Active product with highest inventory availability (26,100 pcs). Meets all electrical specifications with clamping voltage of 13.6V, which provides improved transient suppression compared to the original 14.28V specification. ROHS3 compliant with unlimited moisture sensitivity rating.

SMBJ8.0A-13-F (Diodes Incorporated): Manufacturer-recommended substitute with active product status. Clamping voltage of 13.6V and operating temperature range of -55 to 150°C. ROHS3 and REACH compliant. Moderate inventory availability (4,400 pcs).

SMBJ8.0A-E3/5B (Vishay TransZorb®): Manufacturer-recommended substitute with active product status. Identical electrical specifications to SMBJ8.0A-13-F. Operating temperature range of -55 to 150°C. ROHS3 and REACH compliant. Lower inventory availability (795 pcs).

SMBJ8V0A (Fairchild Semiconductor): Active product with high inventory availability (20,300 pcs). Meets all electrical specifications. RoHS compliance status not specified in available documentation. Supplied in Bulk packaging rather than Tape & Reel.

For new designs and production runs, SMBJ8.0A (MDD) or SMBJ8.0A-13-F (Diodes Incorporated) are preferred due to confirmed ROHS3 compliance, active product status, and adequate supply availability.

Frequently Asked Questions (FAQ)

Q: Can SMBJ8.0A substitute directly for SMBJ8.0 in existing designs?

A: Yes. The SMBJ8.0A meets all critical electrical parameters: 8V reverse standoff voltage, 44.2A peak pulse current, and 600W peak pulse power. The clamping voltage of 13.6V is lower than the original 14.28V, providing superior transient suppression. Package and mounting type are identical (DO-214AA, SMB, surface mount).

Q: What is the significance of the lower clamping voltage in substitute parts?

A: The substitute parts specify a maximum clamping voltage of 13.6V compared to the original 14.28V. This represents improved performance, as lower clamping voltage provides better protection against transient overvoltages. Circuits designed for the original 14.28V specification will operate safely with the lower clamping voltage.

Q: Are all substitute parts ROHS3 compliant?

A: SMBJ8.0A (MDD), SMBJ8.0A-13-F (Diodes Incorporated), and SMBJ8.0A-E3/5B (Vishay) are confirmed ROHS3 compliant. SMBJ8V0A (Fairchild) RoHS compliance status is not specified in available documentation.

Q: What is the difference between Tape & Reel and Bulk packaging?

A: Tape & Reel packaging is standard for automated assembly processes and is suitable for high-volume production. Bulk packaging is typically used for manual assembly or lower-volume applications. SMBJ8.0A (MDD), SMBJ8.0A-13-F (Diodes Incorporated), and SMBJ8.0A-E3/5B (Vishay) are supplied in Tape & Reel. SMBJ8V0A (Fairchild) is supplied in Bulk.

Q: How do operating temperature ranges compare?

A: The original SMBJ8.0 operates from -65 to 150°C. All substitute parts operate from -50 to -55°C to 150°C. For applications requiring operation below -50°C, verify circuit requirements against the reduced lower temperature limit.

Q: Which substitute part offers the best supply availability?

A: SMBJ8.0A (MDD) offers the highest inventory availability at 26,100 pcs, followed by SMBJ8V0A (Fairchild) at 20,300 pcs. Both ensure reliable long-term supply for production and field replacement needs.

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