CD214C-T51CALF Equivalent & Substitute Parts

Part Overview

The CD214C-T51CALF is a bidirectional transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface mount applications. This component features a 51V reverse standoff voltage with an 82.4V maximum clamping voltage and 18.2A peak pulse current capability in a DO-214AB (SMC) package. The part is currently obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	51	V
Voltage - Breakdown (Min)	56.7	V
Voltage - Clamping (Max) @ Ipp	82.4	V
Current - Peak Pulse (10/1000µs)	18.2	A
Power - Peak Pulse	1500	W
Package / Case	DO-214AB, SMC	—
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the CD214C-T51CALF are classified into two categories based on electrical parameter alignment:

Direct Equivalents (Identical Electrical Performance): Parts maintaining all critical electrical parameters—51V reverse standoff voltage, 56.7V minimum breakdown voltage, 82.4V maximum clamping voltage, and 18.2A peak pulse current—with 1500W peak pulse power rating. These parts are pin-compatible and functionally interchangeable without circuit modification.

Similar Alternatives (Enhanced Performance): Parts sharing the same voltage specifications (51V standoff, 82.4V clamping) but with higher peak pulse current ratings (36.4A to 60.7A) and correspondingly higher power dissipation (3000W to 5000W). These parts provide superior transient protection capability and are suitable for applications requiring increased surge handling capacity while maintaining the same voltage protection threshold.

All substitute parts maintain DO-214AB (SMC) package compatibility, surface mount configuration, ROHS3 compliance, and operating temperature ranges within or exceeding the original specification.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Product Status	Operating Temperature (°C)
CD214C-T51CALF	Bourns Inc.	51	82.4	18.2	1500	DO-214AB, SMC	Obsolete	-55 to 150
SMCJ51CA	Good-Ark Semiconductor	51	82.4	18.2	1500	DO-214AB, SMC	Active	-55 to 150
SMCJ51CA-13-F	Diodes Incorporated	51	82.4	18.2	1500	DO-214AB, SMC	Active	-55 to 150
SMCJ51CA-HR	Littelfuse Inc.	51	82.4	18.2	1500	DO-214AB, SMC	Active	-65 to 150
5.0SMDJ51CA	MDE Semiconductor Inc	51	82.4	60.7	5000	DO-214AB, SMC	Active	-55 to 150
5.0SMLJ51CA-TP	Micro Commercial Co	51	82.4	60.7	5000	DO-214AB, SMC	Active	-55 to 175
SMC3K51CA-M3/57	Vishay General Semiconductor - Diodes Division	51	82.4	36.4	3000	DO-214AB, SMC	Active	-55 to 150
SMDJ51CA	Alpha & Omega Semiconductor Inc.	51	82.4	36.5	3000	DO-214AB, SMC	Active	-55 to 150
SMDJ51CA-T7	Littelfuse Inc.	51	82.4	36.4	3000	DO-214AB, SMC	Active	-65 to 150

Engineering Selection Recommendations

For Direct Replacement: SMCJ51CA (Good-Ark Semiconductor), SMCJ51CA-13-F (Diodes Incorporated), and SMCJ51CA-HR (Littelfuse Inc.) provide electrical and mechanical equivalence to the CD214C-T51CALF. All three are active products with ROHS3 compliance and identical voltage and current specifications. SMCJ51CA-HR extends the lower operating temperature limit to -65°C, providing enhanced cold-temperature performance. Selection among these three should be based on supply chain availability and lead time requirements.

For Enhanced Protection: When circuit design permits higher transient energy absorption, SMC3K51CA-M3/57 (Vishay), SMDJ51CA (Alpha & Omega), and SMDJ51CA-T7 (Littelfuse) offer 3000W peak pulse power with 36.4–36.5A peak pulse current. These parts maintain identical voltage protection thresholds while doubling surge handling capacity. The 5.0SMDJ51CA (MDE Semiconductor) and 5.0SMLJ51CA-TP (Micro Commercial Co) provide maximum surge protection at 5000W with 60.7A peak pulse current, suitable for high-energy transient environments. The 5.0SMLJ51CA-TP additionally supports extended operating temperature to 175°C.

All recommended substitutes maintain DO-214AB (SMC) package compatibility, surface mount configuration, and ROHS3 compliance status.

Frequently Asked Questions (FAQ)

Q: Can SMCJ51CA directly replace CD214C-T51CALF without circuit modification?

A: Yes. SMCJ51CA maintains identical electrical specifications: 51V reverse standoff voltage, 82.4V clamping voltage, 18.2A peak pulse current, and 1500W peak pulse power. The DO-214AB (SMC) package is mechanically and electrically compatible. No circuit changes are required.

Q: What is the difference between direct equivalents and similar alternatives?

A: Direct equivalents (SMCJ51CA, SMCJ51CA-13-F, SMCJ51CA-HR) match all electrical parameters of the original part. Similar alternatives (SMC3K51CA-M3/57, SMDJ51CA, 5.0SMDJ51CA) maintain the same voltage protection thresholds but provide higher peak pulse current and power dissipation ratings. Similar alternatives offer enhanced transient protection but are not required for direct replacement.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of the original CD214C-T51CALF.

Q: Which substitute part offers the widest operating temperature range?

A: The 5.0SMLJ51CA-TP (Micro Commercial Co) supports -55°C to 175°C, extending the upper temperature limit by 25°C compared to the original specification of -55°C to 150°C.

Q: Can I use a 5000W-rated part in place of the 1500W original?

A: Yes. The 5.0SMDJ51CA and 5.0SMLJ51CA-TP maintain identical voltage specifications (51V standoff, 82.4V clamping) and are pin-compatible in DO-214AB (SMC) packages. Higher power rating provides additional transient protection margin without affecting normal circuit operation.

Q: What determines whether a part is a suitable substitute?

A: Substitution suitability is determined by: (1) identical or higher reverse standoff voltage (51V minimum), (2) identical or lower maximum clamping voltage (82.4V maximum), (3) identical or higher peak pulse current capability (18.2A minimum), (4) compatible DO-214AB (SMC) package, and (5) surface mount configuration. All listed parts meet these criteria.

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