CD214L-T20ALF Equivalent & Substitute Parts

Part Overview

The CD214L-T20ALF is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Bourns Inc., rated for 20V reverse standoff voltage with 32.4V maximum clamping voltage and 92.6A peak pulse current. Packaged in DO-214AB (SMC) surface mount format, this component is designed for general-purpose transient voltage protection applications across industrial and commercial electronics.

The CD214L-T20ALF is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems or new designs requiring identical electrical performance characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	20	V
Voltage - Breakdown (Min)	22.2	V
Voltage - Clamping (Max) @ Ipp	32.4	V
Current - Peak Pulse (10/1000µs)	92.6	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the CD214L-T20ALF are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes (Identical Electrical Performance) Parts meeting all critical parameters: 20V reverse standoff voltage, 22.2V minimum breakdown voltage, 32.4V maximum clamping voltage, 92.6A peak pulse current (10/1000µs), 3000W peak pulse power, DO-214AB (SMC) package, and unidirectional Zener topology. These parts are interchangeable without circuit redesign.

Similar Substitutes (Compatible with Parameter Variations) Parts sharing the same voltage class (20V standoff, 22.2V breakdown, 32.4V clamping) and package format but with variations in peak pulse current rating, power dissipation, or operating temperature range. Selection depends on application-specific current handling requirements and thermal constraints.

The following parameters determine substitution eligibility:

Voltage - Reverse Standoff: 20V (required)
Voltage - Breakdown (Min): 22.2V (required)
Voltage - Clamping (Max): 32.4V (required)
Package / Case: DO-214AB, SMC (required)
Type: Zener, Unidirectional (required)
Current - Peak Pulse: 46.3A minimum (application-dependent)
Power - Peak Pulse: 1500W minimum (application-dependent)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage Standoff (V)	Breakdown Min (V)	Clamping Max (V)	Peak Pulse Current (A)	Peak Power (W)	Temp Range (°C)	Package	Status
CD214L-T20ALF	Bourns Inc.	20	22.2	32.4	92.6	3000	-55 to 150	DO-214AB, SMC	Obsolete
SMLJ20A	Bourns Inc.	20	22.2	32.4	92.6	3000	-55 to 150	DO-214AB, SMC	Active
3.0SMCJ20A-13	Diodes Incorporated	20	22.2	32.4	62.6	3000	-55 to 175	DO-214AB, SMC	Active
5.0SMDJ20A	Taiwan Semiconductor Corporation	20	22.2	32.4	155	5000	-55 to 175	DO-214AB, SMC	Active
5.0SMDJ20A-T7	Littelfuse Inc.	20	22.2	32.4	155	5000	-65 to 150	DO-214AB, SMC	Active
LNBTVS4-222S	STMicroelectronics	20	22	30	334	22500	-55 to 150	DO-214AB, SMC	Active
SMCJ20A	Fairchild Semiconductor	20	22.2	32.4	46.3	1500	-55 to 150	DO-214AB, SMC	Active
SMCJ20A-TP	Micro Commercial Co	20	22.2	32.4	46.3	1500	-55 to 175	DO-214AB, SMC	Active
SMDJ20A	Alpha & Omega Semiconductor Inc.	20	22.2	32.4	92.6	3000	-55 to 150	DO-214AB, SMC	Active
SMDJ20A-HR	Littelfuse Inc.	20	22.2	32.4	92.6	3000	-65 to 150	DO-214AB, SMC	Active

Engineering Selection Recommendations

Direct Replacement (Identical Specifications)

SMLJ20A (Bourns Inc.) is the primary direct substitute. Manufactured by the same supplier as the original part, it maintains identical electrical parameters: 20V standoff, 22.2V breakdown, 32.4V clamping, 92.6A peak pulse current, and 3000W peak power. Product status is active with ROHS3 compliance and unlimited moisture sensitivity level. This part is recommended for applications requiring exact electrical equivalence without circuit modification.

SMDJ20A (Alpha & Omega Semiconductor Inc.) and SMDJ20A-HR (Littelfuse Inc.) provide identical electrical performance with active product status and ROHS3 compliance. SMDJ20A-HR extends the lower operating temperature to -65°C, suitable for applications requiring enhanced cold-temperature performance.

Compatible Substitutes (Reduced Current Rating)

SMCJ20A (Fairchild Semiconductor) and SMCJ20A-TP (Micro Commercial Co) maintain voltage specifications but reduce peak pulse current to 46.3A and peak power to 1500W. These parts are suitable for applications with lower transient current requirements. SMCJ20A-TP offers extended temperature range to -55 to 175°C.

Enhanced Performance Substitutes (Increased Current/Power Rating)

5.0SMDJ20A (Taiwan Semiconductor Corporation) and 5.0SMDJ20A-T7 (Littelfuse Inc.) provide higher peak pulse current (155A) and peak power (5000W) while maintaining identical voltage specifications. These parts accommodate applications with higher transient energy levels. Both maintain ROHS3 compliance and active product status.

3.0SMCJ20A-13 (Diodes Incorporated) offers intermediate performance with 62.6A peak pulse current and extended operating temperature to -55 to 175°C.

High-Performance Substitute (Extreme Transient Protection)

LNBTVS4-222S (STMicroelectronics, TRANSIL™ series) provides exceptional transient suppression with 334A peak pulse current and 22.5kW peak power. Clamping voltage is 30V (slightly higher than the original 32.4V). This part is suitable for applications requiring maximum transient energy absorption. Product status is active with ROHS3 compliance.

All substitute parts maintain DO-214AB (SMC) surface mount packaging, unidirectional Zener topology, and ROHS3 compliance. Selection should be based on application-specific transient current magnitude, thermal dissipation requirements, and operating temperature constraints.

Frequently Asked Questions (FAQ)

Q: Can SMCJ20A replace CD214L-T20ALF directly in my circuit?

A: SMCJ20A maintains identical voltage specifications (20V standoff, 22.2V breakdown, 32.4V clamping) and package format (DO-214AB, SMC). However, peak pulse current is reduced from 92.6A to 46.3A, and peak power is reduced from 3000W to 1500W. Direct replacement is possible only if your application's transient current does not exceed 46.3A. For higher transient currents, use SMLJ20A, SMDJ20A, or SMDJ20A-HR instead.

Q: What is the difference between SMLJ20A and SMDJ20A?

A: Both parts provide identical electrical performance: 20V standoff, 22.2V breakdown, 32.4V clamping, 92.6A peak pulse current, and 3000W peak power. SMLJ20A is manufactured by Bourns Inc. (same as the original CD214L-T20ALF), while SMDJ20A is manufactured by Alpha & Omega Semiconductor Inc. Both are active products with ROHS3 compliance. Selection depends on supplier availability and procurement preferences.

Q: Can I use 5.0SMDJ20A in place of CD214L-T20ALF?

A: Yes. 5.0SMDJ20A maintains identical voltage specifications and package format. It provides enhanced performance with 155A peak pulse current and 5000W peak power, exceeding the original part's 92.6A and 3000W ratings. This part is suitable for applications requiring higher transient energy absorption. No circuit modification is required.

Q: What does the temperature range difference mean for part selection?

A: CD214L-T20ALF operates from -55°C to 150°C. Some substitutes extend this range: 3.0SMCJ20A-13, 5.0SMDJ20A, and SMCJ20A-TP operate to 175°C; SMDJ20A-HR and 5.0SMDJ20A-T7 extend the lower limit to -65°C. Select parts based on your application's actual operating temperature requirements. Extended temperature range does not affect electrical performance within the original specification range.

Q: Is LNBTVS4-222S compatible with CD214L-T20ALF?

A: LNBTVS4-222S maintains the 20V standoff voltage and DO-214AB (SMC) package. However, clamping voltage is 30V (versus 32.4V for the original), and peak pulse current is 334A with 22.5kW peak power. This part provides significantly enhanced transient suppression capability. Compatibility depends on whether your circuit can tolerate the 30V clamping voltage instead of 32.4V. Verify clamping voltage requirements before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance, matching the original CD214L-T20ALF specification. All parts are suitable for applications requiring RoHS compliance.

Q: What packaging options are available for these substitutes?

A: All substitute parts use DO-214AB (SMC) surface mount packaging, identical to the original CD214L-T20ALF. Packaging format variations (Tape & Reel, Bulk, Cut Tape) relate to supply and handling methods, not component form factor. All parts are compatible with standard SMC footprints.

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