SMBJ300C Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ300C is a surface-mount transient voltage suppressor diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. This component features a 300V reverse standoff voltage rating with a 510.3V maximum clamping voltage and 1.3A peak pulse current capability in a DO-214AA (SMB) package. The SMBJ300C is classified as obsolete, making identification of functionally equivalent active alternatives essential for new designs and ongoing production support.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	300	V
Voltage - Breakdown (Min)	317.7	V
Voltage - Clamping (Max) @ Ipp	510.3	V
Current - Peak Pulse (10/1000µs)	1.3	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	DO-214AA (SMB)	-
Type	Zener	-
Bidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitution of the SMBJ300C is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff: 300V nominal rating
Voltage - Clamping (Max) @ Ipp: Range 482V to 510.3V
Current - Peak Pulse (10/1000µs): 1.3A or 1.23A
Power - Peak Pulse: 600W
Package / Case: DO-214AA (SMB) surface mount
Type: Zener diode, bidirectional, single channel
Applications: General Purpose or Telecom

All substitute parts maintain the same functional voltage protection envelope and thermal dissipation capability. Clamping voltage variations within the specified range reflect normal manufacturing tolerances and do not affect circuit protection performance for applications designed around the 300V standoff specification.

Parameter Comparison

Parameter	SMBJ300C (Littelfuse)	SMBJ300CA (Meritek)	P6SMB350CA (Eaton)	SMBJ300CA-TP (MCC)	TV06B301JB-HF (Comchip)
Voltage - Reverse Standoff (Typ)	300V	300V	300V	300V	300V
Voltage - Breakdown (Min)	317.7V	335V	332V	335V	335V
Voltage - Clamping (Max) @ Ipp	510.3V	486V	482V	486V	486V
Current - Peak Pulse (10/1000µs)	1.3A	1.23A	1.3A	1.3A	1.23A
Power - Peak Pulse	600W	600W	600W	600W	600W
Operating Temperature Range	-65 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 175°C	Not specified
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-214AA (SMB)	DO-214AA (SMB)	DO-214AA (SMB)	DO-214AA (SMB)	DO-214AA (SMB)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

SMBJ300CA (Meritek) - Active product status with ROHS3 compliance. Clamping voltage of 486V and peak pulse current of 1.23A fall within acceptable tolerance for 300V standoff applications. Operating temperature range of -55 to 150°C covers standard industrial requirements. Highest inventory availability (23,850 pcs) supports production continuity.

SMBJ300CA-TP (Micro Commercial Co) - Active product with extended operating temperature range (-55 to 175°C), suitable for high-temperature environments. Peak pulse current matches original specification at 1.3A. Clamping voltage of 486V is equivalent to Meritek variant. Moderate inventory (738 pcs) available.

P6SMB350CA (Eaton - Electronics Division) - Active product with lowest clamping voltage (482V) and matching 1.3A peak pulse current. RoHS non-compliant status may restrict use in regulated markets. Tape & Reel packaging supports automated assembly. Limited inventory (1,521 pcs).

TV06B301JB-HF (Comchip Technology) - Active product with ROHS3 compliance and Tape & Reel packaging. Clamping voltage of 486V and 1.23A peak pulse current are functionally equivalent. Operating temperature range not specified in available data. Inventory of 896 pcs supports moderate production volumes.

Frequently Asked Questions (FAQ)

Q: Can SMBJ300CA directly replace SMBJ300C in existing designs?

A: Yes. Both parts maintain 300V reverse standoff voltage, 600W peak pulse power, and DO-214AA package compatibility. The clamping voltage difference (486V vs 510.3V) represents normal manufacturing tolerance and does not affect circuit protection performance for applications designed around the 300V standoff specification.

Q: What is the significance of the clamping voltage variation across substitute parts?

A: Clamping voltage variations (482V to 510.3V) reflect different manufacturer designs while maintaining the same functional protection envelope. All values fall within acceptable ranges for 300V standoff TVS diodes. Circuit designers should verify that their specific application tolerates the maximum clamping voltage of the selected substitute.

Q: Are there temperature range differences that affect substitution?

A: The original SMBJ300C operates from -65 to 150°C. Substitute parts operate from -55 to 150°C (standard variants) or -55 to 175°C (SMBJ300CA-TP). For applications requiring operation below -55°C, the original specification or SMBJ300CA-TP extended range variant should be evaluated. Most general-purpose applications operate within the -55 to 150°C window.

Q: Does RoHS compliance status affect substitution eligibility?

A: RoHS compliance is a regulatory requirement dependent on end-market and application. SMBJ300CA, SMBJ300CA-TP, and TV06B301JB-HF are ROHS3 compliant. P6SMB350CA is RoHS non-compliant. Select based on your product's regulatory requirements and target markets.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use DO-214AA (SMB) surface-mount packages. Packaging variants differ: SMBJ300CA and SMBJ300CA-TP are available in standard formats, P6SMB350CA is supplied in Tape & Reel, and TV06B301JB-HF is supplied in Tape & Reel. Verify packaging compatibility with your assembly process.

Q: What is the peak pulse current difference between 1.3A and 1.23A variants?

A: Both ratings support 600W peak pulse power dissipation. The 1.3A rating (SMBJ300C, P6SMB350CA, SMBJ300CA-TP) and 1.23A rating (SMBJ300CA, TV06B301JB-HF) are functionally equivalent for 300V standoff applications. Selection should be based on circuit transient current requirements and available inventory.

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