SMBJ20C Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ20C is a bidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 20V reverse standoff voltage with a 34.02V maximum clamping voltage at peak pulse current. The SMBJ20C is classified as obsolete, necessitating identification of active equivalent parts that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	20V
Breakdown Voltage (Min)	21.02V
Clamping Voltage (Max) @ Ipp	34.02V
Peak Pulse Current (10/1000µs)	18.6A
Peak Pulse Power	600W
Package Type	DO-214AA (SMB)
Mounting Type	Surface Mount
Operating Temperature Range	-65°C to 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SMBJ20C is determined by the following critical electrical and mechanical parameters:

Reverse Standoff Voltage: Must be 20V (Typ)
Breakdown Voltage (Min): Must be within 21.02V to 22.2V range
Clamping Voltage (Max) @ Ipp: Acceptable range 32.4V to 35.8V
Peak Pulse Current: Minimum 16.7A, nominal 18.5A to 24.7A
Peak Pulse Power: 600W to 800W
Package: DO-214AA (SMB) surface mount
Bidirectional Channels: 1
Type: Zener
RoHS Compliance: ROHS3 Compliant

All identified substitute parts maintain the same reverse standoff voltage, breakdown voltage specification, and DO-214AA package footprint. Variations in clamping voltage and peak pulse current remain within acceptable operational tolerances for general-purpose transient suppression applications.

Parameter Comparison

Part Number	Manufacturer	Status	Reverse Standoff (V)	Breakdown Min (V)	Clamp Max @ Ipp (V)	Peak Pulse Current (A)	Peak Power (W)	Temp Range (°C)
SMBJ20C	Littelfuse Inc.	Obsolete	20	21.02	34.02	18.6	600	-65 to 150
SMBJ20CA	Fairchild Semiconductor	Active	20	22.2	32.4	18.6	600	-55 to 150
SMB8J20CA-E3/52	Vishay General Semiconductor	Active	20	22.2	32.4	24.7	800	-55 to 150
SMB8J20CA-E3/5B	Vishay General Semiconductor	Active	20	22.2	32.4	24.7	800	-55 to 150
SMBJ20CA-13-F	Diodes Incorporated	Active	20	22.2	32.4	18.5	600	-55 to 150
SMBJ20CA-TP	Micro Commercial Co	Active	20	22.2	32.4	18.5	600	-55 to 175
SMBJ20CA-TR	STMicroelectronics	Active	20	22.2	32.4	19.4	600	-55 to 150
SMBJ20CE3/TR13	Microchip Technology	Active	20	22.2	35.8	16.7	600	-65 to 150
TV06B200JB-G	Comchip Technology	Active	20	22.2	32.4	18.52	600	Not specified

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with modern manufacturing and supply chain requirements.

Primary Substitutes (Closest Electrical Match):

SMBJ20CA (Fairchild Semiconductor): Identical peak pulse current (18.6A), matching clamping voltage specification (32.4V), active status with full compliance documentation.
SMBJ20CA-TR (STMicroelectronics): Peak pulse current 19.4A, clamping voltage 32.4V, active status with REACH compliance.
SMBJ20CA-13-F (Diodes Incorporated): Peak pulse current 18.5A, clamping voltage 32.4V, highest inventory availability (65,200 pcs).

Extended Temperature Range Option:

SMBJ20CA-TP (Micro Commercial Co): Operating range -55°C to 175°C, suitable for applications requiring elevated temperature performance.

Higher Peak Pulse Current Option:

SMB8J20CA-E3/52 and SMB8J20CA-E3/5B (Vishay General Semiconductor): Peak pulse current 24.7A with 800W peak power, providing enhanced transient suppression capability.

Extended Temperature Compatibility:

SMBJ20CE3/TR13 (Microchip Technology): Operating range -65°C to 150°C matching the original SMBJ20C specification, clamping voltage 35.8V.

Frequently Asked Questions (FAQ)

Q: Can SMBJ20CA directly replace SMBJ20C in existing designs? A: Yes. SMBJ20CA maintains identical reverse standoff voltage (20V), equivalent breakdown voltage (22.2V vs 21.02V), and matching DO-214AA package footprint. The clamping voltage difference (32.4V vs 34.02V) and peak pulse current (18.6A) remain within acceptable operational tolerances for general-purpose transient suppression.

Q: What is the difference between SMB8J20CA variants and SMBJ20CA? A: SMB8J20CA-E3/52 and SMB8J20CA-E3/5B offer higher peak pulse current (24.7A) and peak power (800W) compared to SMBJ20CA (18.6A, 600W). Both maintain the same 20V reverse standoff voltage and 32.4V clamping voltage. The SMB8J variants provide enhanced transient suppression margin.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting current environmental and manufacturing standards.

Q: Which substitute offers the best temperature range coverage? A: SMBJ20CE3/TR13 (Microchip Technology) matches the original SMBJ20C operating range of -65°C to 150°C. SMBJ20CA-TP (Micro Commercial Co) extends to 175°C for elevated temperature applications.

Q: Can I use TV06B200JB-G as a substitute? A: Yes. TV06B200JB-G (Comchip Technology) maintains 20V reverse standoff voltage, 22.2V breakdown voltage, 32.4V clamping voltage, and 18.52A peak pulse current. Operating temperature range is not specified in available documentation.

Q: What packaging options are available for these substitutes? A: All substitute parts use DO-214AA (SMB) surface-mount package with identical footprint compatibility. Packaging formats include Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® options depending on manufacturer and part number variant.

Q: Is there a substitute with higher peak pulse current than the original SMBJ20C? A: Yes. SMB8J20CA-E3/52 and SMB8J20CA-E3/5B provide 24.7A peak pulse current (vs 18.6A in SMBJ20C) with 800W peak power, offering improved transient suppression capability while maintaining electrical compatibility.

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