SMCJ70C Equivalent & Substitute Parts

Part Overview

The SMCJ70C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 70V reverse standoff voltage with a maximum clamping voltage of 118.65V at peak pulse current of 13.3A, packaged in the DO-214AB (SMC) form factor. The SMCJ70C is currently listed as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	70	V
Voltage - Breakdown (Min)	73.71	V
Voltage - Clamping (Max) @ Ipp	118.65	V
Current - Peak Pulse (10/1000µs)	13.3	A
Power - Peak Pulse	1500	W
Package / Case	DO-214AB, SMC	—
Operating Temperature Range	-55 to 150	°C
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SMCJ70C is determined by strict alignment of electrical and mechanical parameters. The following criteria define valid substitutes:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 70V (exact match required)
Package / Case: DO-214AB, SMC (mechanical compatibility)
Type: Zener (functional equivalence)
Bidirectional Channels: 1 (circuit topology match)

Secondary Compatibility Parameters:

Voltage - Clamping (Max) @ Ipp: Must not exceed 118.65V for direct drop-in replacement
Current - Peak Pulse (10/1000µs): 13.3A minimum; higher ratings acceptable
Power - Peak Pulse: 1500W minimum; higher ratings acceptable
Operating Temperature Range: Must encompass or exceed -55°C to 150°C

Substitute parts are grouped into two categories: direct equivalents (matching all primary and secondary parameters) and functional alternatives (matching primary criteria with enhanced performance specifications).

Parameter Comparison

Part Number	Manufacturer	VWM (V)	V(BR) Min (V)	VC Max @ Ipp (V)	Ipp (A)	Power (W)	Temp Range (°C)	Status
SMCJ70C	Littelfuse	70	73.71	118.65	13.3	1500	-55 to 150	Obsolete
SMCJ70CA	Fairchild Semiconductor	70	77.8	113	13.3	1500	-55 to 150	Active
SMCJ70CAE3/TR13	Microchip Technology	70	77.8	113	13.3	1500	-65 to 150	Active
SMCJ70CA-TP	Micro Commercial Co	70	77.8	113	13.3	1500	-55 to 175	Active
SMCJ70CA-13-F	Diodes Incorporated	70	77.8	113	13.3	1500	-55 to 150	Active
SMCJ70CE3/TR13	Microchip Technology	70	77.8	125	12	1500	-65 to 150	Active
SMLJ70CA	Bourns Inc.	70	77.8	113	26.6	3000	-55 to 150	Active
SMLJ70CA-TP	Micro Commercial Co	70	77.8	113	26.6	3000	-55 to 175	Active
5.0SMLJ70CA-TP	Micro Commercial Co	70	77.8	113	44.3	5000	-55 to 175	Active

Engineering Selection Recommendations

Direct Equivalents (Preferred for Drop-In Replacement):

SMCJ70CA (Fairchild Semiconductor), SMCJ70CA-13-F (Diodes Incorporated), and SMCJ70CAE3/TR13 (Microchip Technology) provide direct functional equivalence to the SMCJ70C. All three maintain the 70V reverse standoff voltage, 13.3A peak pulse current, and 1500W power rating. These parts are active in production and carry RoHS3 compliance. SMCJ70CAE3/TR13 extends the operating temperature range to -65°C, providing enhanced low-temperature performance. SMCJ70CA-TP (Micro Commercial Co) offers the same electrical specifications with extended upper operating temperature to 175°C.

Enhanced Performance Alternatives:

SMLJ70CA (Bourns Inc.) and SMLJ70CA-TP (Micro Commercial Co) maintain electrical compatibility while doubling the peak pulse current to 26.6A and power dissipation to 3000W. These are suitable where circuit design permits higher current handling without exceeding the 70V standoff requirement. The 5.0SMLJ70CA-TP variant further increases peak pulse current to 44.3A and power to 5000W for applications requiring maximum transient suppression capability.

Temperature-Extended Options:

SMCJ70CA-TP and SMLJ70CA-TP both support operating temperatures to 175°C, compared to the standard 150°C maximum. SMCJ70CAE3/TR13 extends the lower temperature limit to -65°C for cold-environment applications.

Compliance Considerations:

All recommended substitutes carry RoHS3 compliance. Moisture sensitivity level (MSL) is rated 1 (Unlimited) for most variants, indicating no special storage or handling requirements. REACH status varies; verify compliance requirements for your specific application region.

Frequently Asked Questions (FAQ)

Q: Can SMCJ70CA directly replace SMCJ70C in existing designs?

A: Yes. SMCJ70CA maintains identical reverse standoff voltage (70V), peak pulse current (13.3A), and power rating (1500W). The clamping voltage is slightly lower (113V vs. 118.65V), which is acceptable for most general-purpose overvoltage protection circuits. Verify your circuit's maximum allowable clamping voltage before substitution.

Q: What is the difference between SMCJ70CA and SMLJ70CA?

A: Both maintain the 70V standoff voltage and 113V clamping voltage. SMLJ70CA doubles the peak pulse current to 26.6A and power dissipation to 3000W, making it suitable for higher-energy transient events. The "ML" designation indicates medium-level current handling compared to the standard "MC" series.

Q: Are packaging differences between DO-214AB and SMC significant?

A: No. DO-214AB and SMC refer to the same surface-mount package form factor. These designations are interchangeable in component specifications.

Q: Which substitute offers the widest operating temperature range?

A: SMCJ70CA-TP and SMLJ70CA-TP both support -55°C to 175°C. SMCJ70CAE3/TR13 extends the lower limit to -65°C but maintains the standard 150°C upper limit.

Q: Can I use SMCJ70CE3/TR13 as a substitute?

A: SMCJ70CE3/TR13 maintains the 70V standoff voltage but increases clamping voltage to 125V and reduces peak pulse current to 12A. This part is suitable only if your circuit design permits higher clamping voltage and does not require the full 13.3A peak pulse current rating.

Q: What does "Tape & Reel (TR)" packaging mean?

A: Tape & Reel packaging indicates the component is supplied on continuous carrier tape wound on a reel, suitable for automated assembly processes. Bulk packaging indicates loose components. Both are electrically identical; packaging choice depends on manufacturing process requirements.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All recommended substitute parts carry RoHS3 compliance certification, meeting EU Restriction of Hazardous Substances requirements.

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