SMCJ24A-13 Equivalent & Substitute Parts

Part Overview

The SMCJ24A-13 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 24V reverse standoff voltage with a 38.9V maximum clamping voltage and 38.6A peak pulse current capability in a DO-214AB (SMC) package. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	24V
Voltage - Breakdown (Min)	26.7V
Voltage - Clamping (Max) @ Ipp	38.9V
Current - Peak Pulse (10/1000µs)	38.6A
Power - Peak Pulse	1500W
Type	Zener
Unidirectional Channels	1
Mounting Type	Surface Mount
Package / Case	DO-214AB, SMC
Operating Temperature	-55°C ~ 150°C (TJ)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters: reverse standoff voltage (24V), breakdown voltage minimum (26.7V), clamping voltage maximum (38.9V), unidirectional channel configuration (1 channel), and surface-mount package type (DO-214AB/SMC). Peak pulse current and power dissipation ratings may vary among substitutes while maintaining the same voltage protection characteristics. Operating temperature range and RoHS compliance status are secondary considerations that do not disqualify a part from functional equivalence but influence selection based on application requirements and regulatory constraints.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Package	Product Status
SMCJ24A-13	Diodes Incorporated	24V	26.7V	38.9V	38.6A	1500W	DO-214AB, SMC	Discontinued
SMCJ24A-13-F	Diodes Incorporated	24V	26.7V	38.9V	38.6A	1500W	DO-214AB, SMC	Active
SMCJ24A	EVVO Semi	24V	26.7V	38.9V	38.6A	600W	DO-214AC, SMA	Active
3.0SMC24A	Littelfuse Inc.	24V	26.7V	51V	520A (8/20µs)	—	DO-214AB, SMC	Active
5.0SMDJ24A	Taiwan Semiconductor Corporation	24V	26.7V	38.9V	129A	5000W	DO-214AB, SMC	Active
5.0SMDJ24A-T7	Littelfuse Inc.	24V	26.7V	38.9V	129A	5000W	DO-214AB, SMC	Active
SMDJ24A	Alpha & Omega Semiconductor Inc.	24V	26.7V	38.9V	77.2A	3000W	DO-214AB, SMC	Active
SMDJ24A-T7	Littelfuse Inc.	24V	26.7V	38.9V	77.1A	3000W	DO-214AB, SMC	Active
SMLJ24A	Bourns Inc.	24V	26.7V	38.9V	77.2A	3000W	DO-214AB, SMC	Active

Engineering Selection Recommendations

SMCJ24A-13-F (Diodes Incorporated) is the direct functional equivalent with identical electrical specifications and active product status. This part maintains the same 1500W power rating and 38.6A peak pulse current as the original, with the primary distinction being packaging format (Tape & Reel versus bulk). RoHS3 compliance of the -13-F variant provides regulatory advantage over the original non-compliant part.

For applications requiring higher power dissipation capability, 5.0SMDJ24A (Taiwan Semiconductor Corporation) and 5.0SMDJ24A-T7 (Littelfuse Inc.) maintain identical voltage protection parameters while offering 5000W peak pulse power, suitable for high-energy transient environments. Both are RoHS3 compliant and active.

SMDJ24A (Alpha & Omega Semiconductor Inc.), SMDJ24A-T7 (Littelfuse Inc.), and SMLJ24A (Bourns Inc.) provide intermediate power ratings of 3000W with peak pulse currents of 77.1–77.2A, offering cost-effective alternatives when 1500W dissipation is insufficient but 5000W is unnecessary. All three are RoHS3 compliant and active.

SMCJ24A (EVVO Semi) maintains voltage equivalence but uses DO-214AC (SMA) package instead of DO-214AB (SMC), requiring PCB layout modification. Power rating is reduced to 600W, limiting applicability to lower-energy transient scenarios.

3.0SMC24A (Littelfuse Inc.) deviates from voltage equivalence with a 51V clamping voltage maximum, exceeding the original 38.9V specification. This part is suitable only when higher clamping voltage is acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can SMCJ24A-13-F directly replace SMCJ24A-13 without PCB modification?

A: Yes. SMCJ24A-13-F is electrically and mechanically identical to SMCJ24A-13, with the same DO-214AB (SMC) package footprint. The primary difference is packaging format (Tape & Reel). No PCB layout changes are required.

Q: What is the difference between 1500W, 3000W, and 5000W rated parts?

A: These ratings indicate peak pulse power dissipation capability during transient events. Selection depends on the energy content of expected overvoltage transients. Higher-rated parts provide greater margin for high-energy surges but may increase component cost and board space requirements.

Q: Why does SMCJ24A (EVVO Semi) specify DO-214AC (SMA) package instead of DO-214AB (SMC)?

A: DO-214AC and DO-214AB are different package outlines with different footprints. SMA is smaller than SMC. Substitution requires PCB redesign and re-qualification of the new footprint.

Q: Is 3.0SMC24A a suitable substitute?

A: 3.0SMC24A maintains the 24V reverse standoff voltage but specifies 51V maximum clamping voltage, exceeding the original 38.9V. This part is functionally different and suitable only if higher clamping voltage is acceptable for the application circuit.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitutes except the original SMCJ24A-13 are RoHS3 compliant. SMCJ24A-13-F, 5.0SMDJ24A, 5.0SMDJ24A-T7, SMDJ24A, SMDJ24A-T7, and SMLJ24A all meet RoHS3 requirements.

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

A: Most substitutes operate within -55°C to 150°C or -65°C to 150°C. 5.0SMDJ24A extends to 175°C maximum junction temperature. Selection should match application thermal requirements.

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