1SMB30A TR13 Equivalent & Substitute Parts

Part Overview

The 1SMB30A TR13 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Central Semiconductor Corp, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 30V reverse standoff voltage with a 48.4V maximum clamping voltage at 12.4A peak pulse current, housed in a DO-214AA (SMB) package. The part is currently active in production and ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical characteristics (voltage ratings, clamping specifications, and peak pulse current) and compatible packaging standards.

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
Package / Case	DO-214AA, SMB	—
Operating Temperature Range	-65 to 150	°C (TJ)
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 1SMB30A TR13 are grouped into two categories based on electrical performance and application suitability:

Category 1: Direct Electrical Equivalents (12.4A Peak Pulse Current) These parts maintain the exact peak pulse current specification of 12.4A and 600W power dissipation, ensuring drop-in compatibility for applications designed around the original part's current-handling capacity.

Category 2: Enhanced Performance Alternatives (13A–20.7A Peak Pulse Current) These parts exceed the original 12.4A specification, offering higher peak pulse current ratings (13A to 20.7A) and increased power dissipation (600W to 1000W). These are suitable for applications requiring additional transient protection margin or higher energy absorption capacity.

Substitution Criteria:

Voltage - Reverse Standoff: 30V (fixed)
Voltage - Breakdown (Min): 33.3V (fixed)
Voltage - Clamping (Max) @ Ipp: 48.4V (fixed for Category 1; 48.6V acceptable for Category 2)
Package / Case: DO-214AA, SMB (mandatory)
Type: Zener, Unidirectional (fixed)
RoHS Status: ROHS3 Compliant (required)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package / Case	Product Status
1SMB30A TR13	Central Semiconductor Corp	30V	33.3V	48.4V	12.4A	600W	-65 to 150°C	DO-214AA, SMB	Active
SMBJ30A-TP	Micro Commercial Co	30V	33.3V	48.4V	12.4A	600W	-55 to 175°C	DO-214AA, SMB	Active
SACB30	Littelfuse Inc.	30V	33.3V	48.6V	10A	500W	-55 to 150°C	DO-214AA, SMB	Active
SMB10J30A R5G	Taiwan Semiconductor Corporation	30V	33.3V	48.4V	20.7A	1000W	-55 to 175°C	DO-214AA, SMB	Discontinued at DiGi Electronics
SMB10J30A-E3/52	Vishay General Semiconductor - Diodes Division	30V	33.3V	48.4V	20.7A	1000W	-55 to 150°C	DO-214AA, SMB	Active
SMB10J30AHR5G	Taiwan Semiconductor Corporation	30V	33.3V	48.4V	20.7A	1000W	-55 to 175°C	DO-214AA, SMB	Discontinued at DiGi Electronics
SMBJ30A R5G	Taiwan Semiconductor Corporation	30V	33.3V	48.4V	13A	600W	-55 to 150°C	DO-214AA, SMB	Discontinued at DiGi Electronics
SMBJ30A-13-F	Diodes Incorporated	30V	33.3V	48.4V	12.4A	600W	-55 to 150°C	DO-214AA, SMB	Active
SMBJ30A-E3/52	Vishay General Semiconductor - Diodes Division	30V	33.3V	48.4V	12.4A	600W	-55 to 150°C	DO-214AA, SMB	Active
SMBJ30A-E3/5B	Vishay General Semiconductor - Diodes Division	30V	33.3V	48.4V	12.4A	600W	-55 to 150°C	DO-214AA, SMB	Active
SMBJ30A-M3/52	Vishay General Semiconductor - Diodes Division	30V	33.3V	48.4V	12.4A	600W	-55 to 150°C	DO-214AA, SMB	Active

Engineering Selection Recommendations

For Direct Replacement (No Design Changes Required): SMBJ30A-TP (Micro Commercial Co), SMBJ30A-13-F (Diodes Incorporated), SMBJ30A-E3/52 (Vishay), SMBJ30A-E3/5B (Vishay), and SMBJ30A-M3/52 (Vishay) are all active production parts with identical or equivalent electrical specifications to the 1SMB30A TR13. These parts maintain the 12.4A peak pulse current and 600W power dissipation. All are ROHS3 compliant and suitable for immediate substitution in existing designs.

For Enhanced Protection (Higher Current Capacity): SMB10J30A-E3/52 (Vishay) and SMB10J30AHR5G (Taiwan Semiconductor Corporation) offer 20.7A peak pulse current and 1000W power dissipation while maintaining the same voltage ratings and DO-214AA package. These are appropriate for applications requiring additional transient energy absorption or where design margins justify higher-rated components. SMB10J30A-E3/52 is currently active; SMB10J30AHR5G is discontinued at DiGi Electronics but available in inventory.

For Cost-Optimized Selection: SACB30 (Littelfuse Inc.) provides a lower-cost alternative with 10A peak pulse current and 500W power dissipation. This part is suitable only for applications where the original 12.4A specification exceeds actual transient requirements. The 48.6V clamping voltage is within acceptable tolerance of the 48.4V specification.

Discontinued Parts: SMB10J30A R5G, SMB10J30AHR5G, and SMBJ30A R5G are discontinued at DiGi Electronics. Existing inventory is available but long-term supply cannot be assured. These should be avoided for new designs unless inventory commitments are secured.

Frequently Asked Questions (FAQ)

Q: Can SMBJ30A-TP be used as a direct replacement for 1SMB30A TR13? A: Yes. SMBJ30A-TP matches all critical electrical parameters: 30V reverse standoff, 33.3V breakdown minimum, 48.4V clamping maximum, and 12.4A peak pulse current. Both are housed in DO-214AA (SMB) packages and are ROHS3 compliant. The operating temperature range of SMBJ30A-TP (-55 to 175°C) exceeds that of the original part (-65 to 150°C), providing additional margin.

Q: What is the difference between 12.4A and 20.7A peak pulse current ratings? A: Peak pulse current rating defines the maximum transient current the diode can safely conduct during a 10/1000µs pulse without degradation. The 1SMB30A TR13 is rated for 12.4A; higher-rated alternatives like SMB10J30A-E3/52 (20.7A) can absorb larger transient events. Selection depends on the actual transient current expected in the application. Oversizing provides additional protection margin but increases component cost.

Q: Are all substitute parts in the same package? A: Yes. All listed substitute parts use the DO-214AA (SMB) package, ensuring mechanical and electrical compatibility with the original 1SMB30A TR13. Footprint and mounting procedures remain identical.

Q: Why does SACB30 have a lower peak pulse current (10A) than the original part (12.4A)? A: SACB30 is a cost-optimized variant from Littelfuse Inc. with reduced current-handling capacity. It is suitable only for applications where transient currents do not exceed 10A. Use of this part in designs expecting 12.4A transients may result in component failure or reduced protection effectiveness.

Q: Which substitute parts are recommended for new designs? A: SMBJ30A-TP, SMBJ30A-13-F, SMBJ30A-E3/52, SMBJ30A-E3/5B, and SMBJ30A-M3/52 are all active production parts with confirmed long-term availability. These are preferred for new designs. SMB10J30A-E3/52 is also active and recommended if enhanced current capacity is required.

Q: What does "Discontinued at DiGi Electronics" mean for SMB10J30A R5G and similar parts? A: This designation indicates the part is no longer actively stocked or promoted by DiGi Electronics, though existing inventory may remain available. For new designs, active production alternatives should be selected to ensure supply continuity and manufacturer support.

Q: Are there temperature range differences between substitute parts? A: Yes. The original 1SMB30A TR13 operates from -65 to 150°C. SMBJ30A-TP extends this to -55 to 175°C, while most Vishay parts operate from -55 to 150°C. For applications requiring the full -65°C lower limit, the original part or SMBJ30A-TP should be specified. For standard industrial applications (-40 to 85°C), all listed parts are suitable.

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