SMCJ20A-13 Transient Voltage Suppressor Diode Equivalent & Substitute Parts

Part Overview

The SMCJ20A-13 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated in the DO-214AB (SMC) surface mount package. This component is designed for general-purpose transient voltage suppression applications with a 20V reverse standoff voltage and 32.4V maximum clamping voltage at peak pulse current of 46.3A. The original part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain the same electrical performance characteristics and package compatibility.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	20V
Voltage - Breakdown (Min)	22.2V
Voltage - Clamping (Max) @ Ipp	32.4V
Current - Peak Pulse (10/1000µs)	46.3A
Power - Peak Pulse	1500W
Type	Zener
Unidirectional Channels	1
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 150°C (TJ)

Substitute Part Grouping Explanation

Substitute parts for the SMCJ20A-13 are classified into two categories based on electrical performance alignment:

Category 1: Direct Electrical Equivalents (1500W Peak Pulse Power) These parts maintain identical electrical specifications including 20V reverse standoff voltage, 22.2V minimum breakdown voltage, 32.4V maximum clamping voltage, and 1500W peak pulse power rating. Peak pulse current varies between 46.3A and 92.6A depending on manufacturer design. These substitutes are interchangeable for applications requiring the original 1500W power dissipation specification.

Category 2: Enhanced Performance Alternatives (3000W–5000W Peak Pulse Power) These parts maintain the same voltage specifications (20V standoff, 22.2V breakdown, 32.4V clamping) but provide higher peak pulse current ratings (92.6A to 155A) and increased power dissipation (3000W to 5000W). These are suitable for applications where additional transient energy absorption capacity is beneficial without exceeding the voltage clamping characteristics.

Key Parameters Determining Substitution:

Voltage - Reverse Standoff: 20V (fixed)
Voltage - Breakdown (Min): 22.2V (fixed)
Voltage - Clamping (Max) @ Ipp: 32.4V (fixed for Category 1; may vary for Category 2)
Package / Case: DO-214AB, SMC (fixed)
Mounting Type: Surface Mount (fixed)
Unidirectional Channels: 1 (fixed)

Parameter Comparison

Part Number	Manufacturer	Standoff (V)	Breakdown Min (V)	Clamp Max (V)	Peak Pulse (A)	Power (W)	Temp Range (°C)	Status
SMCJ20A-13	Diodes Incorporated	20	22.2	32.4	46.3	1500	-55 to 150	Discontinued
SMCJ20A-13-F	Diodes Incorporated	20	22.2	32.4	46.3	1500	-55 to 150	Active
SMCJ20A	Fairchild Semiconductor	20	22.2	32.4	46.3	1500	-55 to 150	Active
SMCJ20A-TP	Micro Commercial Co	20	22.2	32.4	46.3	1500	-55 to 175	Active
5.0SMDJ20A	Taiwan Semiconductor Corporation	20	22.2	32.4	155	5000	-55 to 175	Active
5.0SMDJ20A-T7	Littelfuse Inc.	20	22.2	32.4	155	5000	-65 to 150	Active
SMCJ20A-TR	STMicroelectronics	20	22.2	42.8	234	1500	-55 to 150	Active
SMDJ20A	Alpha & Omega Semiconductor Inc.	20	22.2	32.4	92.6	3000	-55 to 150	Active
SMLJ20A	Bourns Inc.	20	22.2	32.4	92.6	3000	-55 to 150	Active

Engineering Selection Recommendations

Primary Recommendation: SMCJ20A-13-F (Diodes Incorporated) This part is the direct equivalent of the discontinued SMCJ20A-13, manufactured by the same supplier with identical electrical specifications and package configuration. It is currently in active production with high inventory availability (35,400 pcs). RoHS3 compliance status is confirmed. This is the preferred substitution for direct replacement without design modification.

Secondary Recommendation: SMCJ20A (Fairchild Semiconductor) Maintains identical electrical and thermal specifications to the original part. Active product status with substantial inventory (23,864 pcs). Suitable for applications where Fairchild sourcing is preferred or required by supply chain specifications.

Alternative for Extended Temperature Range: SMCJ20A-TP (Micro Commercial Co) Provides identical electrical performance with extended upper operating temperature limit to 175°C (versus 150°C for the original). RoHS3 compliant. Recommended for applications requiring enhanced thermal margin or operation in elevated ambient conditions.

Enhanced Performance Options:

SMDJ20A (Alpha & Omega Semiconductor Inc.) or SMLJ20A (Bourns Inc.): Provide doubled peak pulse current (92.6A) and tripled power dissipation (3000W) while maintaining identical voltage specifications. Suitable for applications requiring greater transient energy absorption capacity.
5.0SMDJ20A (Taiwan Semiconductor Corporation) or 5.0SMDJ20A-T7 (Littelfuse Inc.): Provide maximum peak pulse current (155A) and power dissipation (5000W) with identical voltage characteristics. Recommended for high-energy transient suppression applications.

Note on STMicroelectronics SMCJ20A-TR: This part exhibits a higher maximum clamping voltage (42.8V versus 32.4V) and significantly higher peak pulse current (234A). This represents a different electrical characteristic and is not recommended as a direct substitute for applications sensitive to clamping voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can SMCJ20A-13-F be used as a direct replacement for SMCJ20A-13? A: Yes. SMCJ20A-13-F is manufactured by Diodes Incorporated with identical electrical specifications, package configuration (DO-214AB, SMC), and operating temperature range. The primary difference is packaging format (Tape & Reel versus bulk) and active product status. No design modification is required.

Q: What is the difference between 1500W and 3000W/5000W rated parts? A: Peak pulse power rating indicates the maximum transient energy the device can dissipate during a single 10/1000µs pulse event. Parts rated 3000W or 5000W provide greater transient energy absorption capacity while maintaining identical voltage clamping characteristics. Selection depends on the peak transient energy present in the application circuit.

Q: Are all substitute parts in the DO-214AB (SMC) package? A: Yes. All listed substitute parts use the DO-214AB surface mount package, ensuring mechanical and electrical compatibility with the original SMCJ20A-13 PCB footprint and assembly process.

Q: What does RoHS3 compliance mean for this component? A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The original SMCJ20A-13 is RoHS non-compliant; most active substitutes are RoHS3 compliant, which may be required for new designs or specific customer specifications.

Q: Can I use a higher power-rated part (3000W or 5000W) in place of the 1500W original? A: Yes, provided the application circuit does not exceed the voltage clamping specifications. Higher power-rated parts provide additional transient energy absorption margin without changing voltage protection characteristics. Verify that peak pulse current and clamping voltage remain within acceptable limits for the protected circuit.

Q: What is the operating temperature range consideration for substitution? A: The original SMCJ20A-13 operates from -55°C to 150°C. Most substitutes maintain this range; SMCJ20A-TP extends to 175°C, and 5.0SMDJ20A-T7 extends to -65°C minimum. Select based on application thermal requirements. Extended temperature range does not affect electrical performance within the specified operating window.

Q: Are there any compliance or certification differences between manufacturers? A: All listed substitutes maintain RoHS3 compliance (except the original discontinued part). REACH status is consistent across all parts (REACH Unaffected or REACH Affected as noted). ECCN and HTSUS classifications are identical. Verify specific customer or regional compliance requirements before final selection.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message