CD214A-T40ALF Equivalent & Substitute Parts

Part Overview

The CD214A-T40ALF is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 40V reverse standoff voltage with a 64.5V maximum clamping voltage and 6.2A peak pulse current capability in a DO-214AC (SMA) package. The part is currently classified as 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)	40	V
Voltage - Breakdown (Min)	44.4	V
Voltage - Clamping (Max) @ Ipp	64.5	V
Current - Peak Pulse (10/1000µs)	6.2	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CD214A-T40ALF is determined by strict alignment of the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): Must be 40V ±tolerance to maintain circuit protection threshold
Voltage - Clamping (Max) @ Ipp: Must be 64.5V or lower to ensure clamped voltage does not exceed protected circuit limits
Current - Peak Pulse (10/1000µs): Must be 6.2A or higher to handle transient energy without failure
Power - Peak Pulse: Must be 400W or higher to dissipate transient energy safely
Package / Case: Must be DO-214AC (SMA) for mechanical and thermal compatibility
Mounting Type: Must be Surface Mount for PCB assembly compatibility
Type: Must be Zener unidirectional diode
RoHS & MSL Compliance: Must meet ROHS3 and MSL 1 requirements for manufacturing and environmental standards

Substitute parts are categorized as follows:

Direct Equivalents: Parts with identical electrical specifications (40V standoff, 64.5V clamp, 6.2A peak pulse) and active product status.

Similar Substitutes: Parts with comparable voltage ratings and clamping characteristics within acceptable tolerance ranges, maintaining the same package and mounting type. These parts may have slightly different peak pulse currents or clamping voltages but remain functionally compatible for general-purpose protection applications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Product Status	RoHS Status
CD214A-T40ALF	Bourns Inc.	40	64.5	6.2	400	-55 to 150	Obsolete	ROHS3 Compliant
SMAJ40A	MDD	40	64.5	6.2	400	-50 to 150	Active	ROHS3 Compliant
P4SMA47A-M3/5A	Vishay General Semiconductor - Diodes Division	40.2	64.8	6.2	400	-65 to 150	Active	ROHS3 Compliant
P4SMA47A-M3/61	Vishay General Semiconductor - Diodes Division	40.2	64.8	6.2	400	-65 to 150	Active	ROHS3 Compliant
P4SMA51A-M3/5A	Vishay General Semiconductor - Diodes Division	43.6	70.1	5.7	400	-65 to 150	Active	ROHS3 Compliant
P4SMA51A-M3/61	Vishay General Semiconductor - Diodes Division	43.6	70.1	5.7	400	-65 to 150	Active	ROHS3 Compliant
P4SMA56A-M3/5A	Vishay General Semiconductor - Diodes Division	47.8	77	5.2	400	-65 to 150	Active	ROHS3 Compliant
P4SMA56A-M3/61	Vishay General Semiconductor - Diodes Division	47.8	77	5.2	400	-65 to 150	Active	ROHS3 Compliant
SM4T47AY	STMicroelectronics	40	84	27 (8/20µs)	400	-55 to 150	Active	ROHS3 Compliant
SMA5J40A-M3/5A	Vishay General Semiconductor - Diodes Division	40	64.5	7.8	500	-55 to 150	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent Selection: SMAJ40A (MDD) and SMA5J40A-M3/5A (Vishay) are the primary candidates for direct replacement of the CD214A-T40ALF. Both maintain identical or superior electrical specifications with active product status and full ROHS3 compliance. SMAJ40A provides exact electrical matching with a slightly reduced lower operating temperature limit (-50°C vs. -55°C). SMA5J40A-M3/5A offers enhanced peak pulse current (7.8A vs. 6.2A) and increased power dissipation capability (500W vs. 400W), providing additional design margin.

Similar Substitute Selection: The Vishay P4SMA series (P4SMA47A-M3/5A, P4SMA47A-M3/61) offers near-equivalent performance with marginally higher voltage ratings (40.2V standoff, 64.8V clamp) and extended lower operating temperature range (-65°C). These parts are suitable for applications where the slightly elevated clamping voltage remains within circuit tolerance. The P4SMA51A and P4SMA56A variants feature progressively higher voltage ratings and are appropriate only for circuits designed to tolerate higher clamping voltages.

Automotive-Grade Alternative: SM4T47AY (STMicroelectronics) provides automotive-qualified protection (AEC-Q101) with identical 40V standoff voltage but significantly elevated clamping voltage (84V) and peak pulse current (27A at 8/20µs). This part is suitable only for applications where the higher clamping voltage is acceptable and where automotive qualification is required.

All recommended substitutes maintain DO-214AC (SMA) package compatibility, surface-mount capability, and ROHS3 compliance with MSL 1 rating.

Frequently Asked Questions (FAQ)

Q: Can SMAJ40A directly replace CD214A-T40ALF without circuit modification?

A: Yes. SMAJ40A maintains identical electrical specifications (40V standoff, 64.5V clamp, 6.2A peak pulse) and DO-214AC package compatibility. The only difference is a 5°C reduction in minimum operating temperature (-50°C vs. -55°C), which is acceptable for most applications operating above -50°C.

Q: What is the difference between P4SMA47A variants (M3/5A vs. M3/61)?

A: Both variants are electrically identical. The suffix designates packaging configuration: M3/5A indicates Tape & Reel packaging with 5,000-unit reels, while M3/61 indicates Tape & Reel packaging with different reel specifications. Electrical performance and compatibility are identical.

Q: Can P4SMA51A or P4SMA56A be used as substitutes?

A: These parts are not direct substitutes. P4SMA51A features a 43.6V standoff voltage and 70.1V clamping voltage, while P4SMA56A features 47.8V standoff and 77V clamping. These higher voltage ratings are suitable only for circuits designed to tolerate elevated clamping voltages. Use only if circuit design permits higher transient voltage clamping.

Q: Why does SM4T47AY have a much higher peak pulse current (27A)?

A: SM4T47AY uses a different pulse waveform specification (8/20µs vs. 10/1000µs). The higher current value reflects measurement under a different transient profile. Direct current comparison is not valid between different pulse specifications. This part is suitable only for automotive applications requiring AEC-Q101 qualification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, meeting manufacturing and environmental standards equivalent to the original CD214A-T40ALF.

Q: What is the impact of SMA5J40A-M3/5A having 7.8A peak pulse vs. 6.2A?

A: SMA5J40A-M3/5A provides enhanced transient current handling capability (7.8A vs. 6.2A) and increased power dissipation (500W vs. 400W). This represents a design improvement offering additional safety margin without any compatibility issues. It is a suitable direct replacement with enhanced performance.

Q: Can these parts be used interchangeably in automated assembly?

A: Yes. All substitute parts maintain identical DO-214AC (SMA) package dimensions and surface-mount compatibility. No assembly process modification is required. Verify tape-and-reel specifications (M3/5A vs. M3/61) match your feeder equipment if using automated pick-and-place systems.

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