SMCJ9.0 Equivalent & Substitute Parts

Part Overview

The SMCJ9.0 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. Housed in the DO-214AB (SMC) package, this component features a 9V reverse standoff voltage and 16.17V maximum clamping voltage at peak pulse current of 97.4A. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	9	V
Breakdown Voltage (Min)	9.5	V
Clamping Voltage (Max) @ Ipp	16.17	V
Peak Pulse Current (10/1000µs)	97.4	A
Peak Pulse Power	1500	W
Operating Temperature Range	-55 to 150	°C
Package Type	DO-214AB (SMC)	—
Mounting Type	Surface Mount	—
Diode Type	Zener	—
Channels	1 (Unidirectional)	—

Substitute Part Grouping Explanation

Substitution of the SMCJ9.0 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Reverse standoff voltage: 9V nominal
Package/case: DO-214AB or SMC equivalent
Mounting type: Surface mount
Diode configuration: Unidirectional Zener
Operating temperature range: Minimum -55°C to +150°C

Secondary Compatibility Parameters:

Clamping voltage (Max) @ Ipp: 14.4V to 16.17V range
Peak pulse current: 97.4A to 104.2A range (standard power class)
Peak pulse power: 1500W (standard class)
RoHS3 compliance and MSL Level 1

Substitute parts are grouped into two categories based on peak pulse current rating:

Category A (97.4A Ipp): Direct electrical equivalents with identical peak pulse current specifications. Includes SMCJ9.0A-13-F, TV15C9V0J-G, and SMCJ9.0AE3/TR13.

Category B (102A to 104.2A Ipp): Functionally equivalent with slightly elevated peak pulse current within the same power class. Includes SMCJ9.0A and SMCJ8.5A-13-F.

Category C (194.8A Ipp): Higher power class alternatives with doubled peak pulse current and 3000W peak pulse power rating. Includes SMLJ9.0A, SMLJ9.0A-TP, and SMLJ9.0AE3/TR13.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamp Max @ Ipp (V)	Ipp (A)	Power (W)	Temp Range (°C)	Package	Status
SMCJ9.0	Littelfuse Inc.	9	9.5	16.17	97.4	1500	-55 to 150	DO-214AB (SMC)	Obsolete
SMCJ9.0A	Taiwan Semiconductor	9	10	15.4	102	1500	-55 to 150	DO-214AB (SMC)	Active
SMCJ8.5A-13-F	Diodes Incorporated	8.5	9.44	14.4	104.2	1500	-55 to 150	DO-214AB (SMC)	Active
SMCJ9.0A-13-F	Diodes Incorporated	9	10	15.4	97.4	1500	-55 to 150	DO-214AB (SMC)	Active
SMCJ9.0AE3/TR13	Microchip Technology	9	10	15.4	97.4	1500	-65 to 150	DO-214AB (SMC)	Active
SMCJ9.0E3/TR13	Microchip Technology	9	9.44	14.4	104.2	1500	-65 to 150	DO-214AB (SMC)	Active
SMLJ9.0A	Bourns Inc.	9	10	15.4	194.8	3000	-55 to 150	DO-214AB (SMC)	Active
SMLJ9.0A-TP	Micro Commercial Co	9	10	15.4	194.8	3000	-55 to 175	DO-214AB (SMC)	Active
SMLJ9.0AE3/TR13	Microchip Technology	9	10	15.4	194.8	3000	-55 to 150	DO-214AB (SMC)	Active
TV15C9V0J-G	Comchip Technology	9	10	15.4	97.4	1500	-55 to 150	DO-214AB (SMC)	Active

Engineering Selection Recommendations

For Direct Replacement (1500W Power Class):

SMCJ9.0A (Taiwan Semiconductor) is the primary active equivalent. It maintains the 9V reverse standoff voltage, DO-214AB package, and 1500W peak pulse power rating. The clamping voltage of 15.4V is within acceptable tolerance of the original 16.17V specification. This part is in active production with high inventory availability (30,100 units).

SMCJ9.0A-13-F (Diodes Incorporated) and TV15C9V0J-G (Comchip Technology) provide identical electrical performance to the original SMCJ9.0, with peak pulse current of 97.4A and clamping voltage of 15.4V. Both are active products with RoHS3 compliance and MSL Level 1 rating.

SMCJ9.0AE3/TR13 (Microchip Technology) offers extended operating temperature range (-65°C to +150°C) compared to the standard -55°C to +150°C, providing additional thermal margin in demanding applications. Supplied in tape and reel packaging.

For Higher Power Applications (3000W Power Class):

SMLJ9.0A (Bourns Inc.), SMLJ9.0A-TP (Micro Commercial Co), and SMLJ9.0AE3/TR13 (Microchip Technology) are suitable when circuit design permits use of higher peak pulse current (194.8A) and power dissipation (3000W). These parts maintain the 9V reverse standoff voltage and DO-214AB package but provide doubled transient energy handling capability.

For Marginal Voltage Applications:

SMCJ8.5A-13-F (Diodes Incorporated) and SMCJ9.0E3/TR13 (Microchip Technology) feature 8.5V reverse standoff voltage with 14.4V clamping voltage. These are suitable only when circuit design specifically accommodates the lower standoff voltage specification.

All recommended substitutes are RoHS3 compliant with MSL Level 1 moisture sensitivity rating, ensuring compatibility with standard surface-mount assembly processes.

Frequently Asked Questions (FAQ)

Q: Can SMCJ9.0A directly replace SMCJ9.0 without circuit modification?

A: Yes. SMCJ9.0A maintains the same 9V reverse standoff voltage, DO-214AB package, and 1500W power rating. The clamping voltage difference (15.4V vs. 16.17V) is within normal manufacturing tolerance for this component class and does not require circuit redesign.

Q: What is the difference between SMCJ and SMLJ series parts?

A: The SMLJ series represents a higher power class with doubled peak pulse current (194.8A vs. 97.4A) and peak pulse power (3000W vs. 1500W). Both series use identical DO-214AB packaging and maintain the same 9V reverse standoff voltage. SMLJ parts are suitable for applications requiring greater transient energy absorption.

Q: Are tape and reel packaged parts (TR13 suffix) electrically identical to bulk packaged equivalents?

A: Yes. The packaging format (tape and reel vs. bulk) affects only handling and assembly logistics. Electrical specifications and performance are identical. The TR13 designation indicates tape and reel packaging with 13-inch reel diameter, standard for automated assembly lines.

Q: Can SMCJ8.5A-13-F be used as a substitute for SMCJ9.0?

A: SMCJ8.5A-13-F has a lower reverse standoff voltage (8.5V vs. 9V) and lower clamping voltage (14.4V vs. 16.17V). Substitution is only permissible if circuit design analysis confirms that the lower voltage thresholds are acceptable for the specific application. This part is not a direct equivalent.

Q: What does RoHS3 compliance indicate?

A: RoHS3 compliance certifies that the component meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All recommended substitutes carry RoHS3 certification, ensuring compatibility with modern manufacturing and environmental standards.

Q: Why is SMCJ9.0AE3/TR13 specified with -65°C minimum operating temperature?

A: SMCJ9.0AE3/TR13 is rated for -65°C to +150°C operation, compared to the standard -55°C to +150°C range. This extended low-temperature specification provides additional thermal margin for applications operating in extreme cold environments or with stringent reliability requirements.

Q: Are all substitute parts available in the same DO-214AB package?

A: Yes. All recommended substitutes use the DO-214AB (SMC) surface-mount package, ensuring mechanical and footprint compatibility with the original SMCJ9.0 design. No PCB layout modifications are required.

Q: What is MSL Level 1 moisture sensitivity rating?

A: MSL Level 1 indicates unlimited shelf life without moisture-related degradation. Components with this rating do not require special moisture-barrier packaging or baking procedures prior to assembly, simplifying supply chain and manufacturing logistics.

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