1SMB30AT3 Equivalent & Substitute Parts

Part Overview

The 1SMB30AT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface mount applications. This unidirectional Zener diode features a 30V reverse standoff voltage with a 48.4V maximum clamping voltage at 12.4A peak pulse current. The component is packaged in DO-214AA (SMB) form factor with 600W peak pulse power rating.

The 1SMB30AT3 is classified as obsolete. Equivalent and substitute parts are available from active manufacturers including MDD, Nexperia, Littelfuse, Diodes Incorporated, and Vishay, offering identical or comparable electrical performance with current product status and improved compliance certifications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	30	V
Voltage - Breakdown (Min)	33.3	V
Voltage - Clamping (Max) @ Ipp	48.4	V
Current - Peak Pulse (10/1000µs)	12.4	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65°C to 150°C	TJ
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the 1SMB30AT3 is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 30V
Voltage - Breakdown (Min): 33.3V
Voltage - Clamping (Max) @ Ipp: 48.4V (±0.2V tolerance acceptable)
Current - Peak Pulse (10/1000µs): 12.4A (±0.0A minimum)
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Unidirectional Channels: 1
Type: Zener

Substitute parts are classified into two categories:

Direct Equivalents maintain identical electrical specifications and SMB packaging. These parts are pin-compatible and functionally interchangeable without circuit modification.

Similar Equivalents maintain identical voltage and current ratings but may differ in package form factor (SOD-128), clamping voltage tolerance (±0.2V), or peak pulse current (10A vs. 12.4A). These require package-level compatibility verification before substitution.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	VBR (V)	VC (V)	Ipp (A)	PPP (W)	Package	Status	RoHS
1SMB30AT3	onsemi	30	33.3	48.4	12.4	600	DO-214AA, SMB	Obsolete	Non-compliant
SMBJ30A	MDD	30	33.3	48.4	12.4	600	DO-214AA, SMB	Active	Compliant
PTVS30VP1UP,115	Nexperia USA Inc.	30	33.3	48.4	12.4	600	SOD-128	Active	ROHS3 Compliant
SACB30	Littelfuse Inc.	30	33.3	48.6	10	500	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ30A-13-F	Diodes Incorporated	30	33.3	48.4	12.4	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ30A-HR	Littelfuse Inc.	30	33.3	48.4	12.4	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ30A-HRA	Littelfuse Inc.	30	33.3	48.4	12.4	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ30A-M3/52	Vishay General Semiconductor - Diodes Division	30	33.3	48.4	12.4	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ30A-M3/5B	Vishay General Semiconductor - Diodes Division	30	33.3	48.4	12.4	600	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitution (No Circuit Modification Required):

SMBJ30A (MDD), SMBJ30A-13-F (Diodes Incorporated), SMBJ30A-HR (Littelfuse), SMBJ30A-HRA (Littelfuse), SMBJ30A-M3/52 (Vishay), and SMBJ30A-M3/5B (Vishay) are direct electrical and mechanical equivalents to the 1SMB30AT3. All maintain identical voltage ratings, peak pulse current, and SMB packaging. All substitute parts carry active product status and ROHS3 compliance, addressing the obsolescence and compliance limitations of the original component.

Conditional Substitution (Package Compatibility Verification Required):

PTVS30VP1UP,115 (Nexperia) maintains identical electrical specifications but uses SOD-128 packaging instead of SMB. This part is suitable only if the PCB layout and footprint accommodate SOD-128/CFP5 form factor. The part carries AEC-Q101 automotive qualification.

SACB30 (Littelfuse) maintains the SMB package but differs in peak pulse current (10A vs. 12.4A) and clamping voltage (48.6V vs. 48.4V). This part is suitable for applications where the lower peak pulse current rating is acceptable and the marginal clamping voltage increase does not exceed circuit protection thresholds.

Frequently Asked Questions (FAQ)

Q: Can SMBJ30A directly replace 1SMB30AT3 without PCB modification?

A: Yes. SMBJ30A maintains identical electrical specifications (30V standoff, 48.4V clamping, 12.4A peak pulse) and SMB packaging. No circuit or layout changes are required.

Q: What is the difference between SMBJ30A-HR and SMBJ30A-HRA?

A: Both parts are manufactured by Littelfuse and maintain identical electrical specifications and SMB packaging. The suffix designations indicate different internal construction or qualification batches. Both are direct equivalents to 1SMB30AT3.

Q: Why does SACB30 show 10A peak pulse instead of 12.4A?

A: SACB30 is rated for 10A peak pulse current with 500W peak pulse power, compared to 1SMB30AT3 at 12.4A and 600W. SACB30 is suitable only if the application peak pulse current does not exceed 10A. The clamping voltage (48.6V) is within acceptable tolerance.

Q: Is PTVS30VP1UP,115 compatible with existing SMB footprints?

A: No. PTVS30VP1UP,115 uses SOD-128 packaging, which has a different footprint than DO-214AA (SMB). PCB layout modification is required. This part is suitable only if the design can accommodate SOD-128 form factor.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts listed carry ROHS3 compliance. The original 1SMB30AT3 is RoHS non-compliant. Substitution addresses both obsolescence and regulatory compliance requirements.

Q: What is the operating temperature range difference between 1SMB30AT3 and substitutes?

A: 1SMB30AT3 operates from -65°C to 150°C. Most substitutes operate from -55°C to 150°C. SMBJ30A-HR and SMBJ30A-HRA maintain the -65°C lower limit. Verify application temperature requirements before selection.

Q: Can multiple substitute parts be used interchangeably in the same design?

A: Yes, provided all parts maintain identical electrical specifications (30V standoff, 48.4V clamping, 12.4A peak pulse) and SMB packaging. SMBJ30A (MDD), SMBJ30A-13-F (Diodes), SMBJ30A-HR (Littelfuse), SMBJ30A-HRA (Littelfuse), SMBJ30A-M3/52 (Vishay), and SMBJ30A-M3/5B (Vishay) are fully interchangeable.

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