CD214A-T30ALF Equivalent & Substitute Parts

Part Overview

The CD214A-T30ALF is a transient voltage suppressor (TVS) diode manufactured by Bourns Inc., classified as a unidirectional Zener-type device in the DO-214AC (SMA) surface mount package. This component is rated for 30V reverse standoff voltage with a 48.4V maximum clamping voltage and 8.3A peak pulse current capability. The part is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	30	V
Voltage - Breakdown (Min)	33.3	V
Voltage - Clamping (Max) @ Ipp	48.4	V
Current - Peak Pulse (10/1000µs)	8.3	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the CD214A-T30ALF is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 30V
Voltage - Clamping (Max) @ Ipp: 48.4V
Current - Peak Pulse (10/1000µs): 8.3A
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount

Parts are grouped into two categories:

Direct Equivalents maintain identical electrical specifications (30V standoff, 48.4V clamping, 8.3A peak pulse) with the same package and mounting configuration. These parts are pin-compatible and functionally interchangeable without circuit modification.

Similar Alternatives share the same 30V reverse standoff voltage and DO-214AC package but differ in clamping voltage and/or peak pulse current ratings. These parts are mechanically compatible but require circuit-level evaluation to confirm suitability for the intended application.

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage (V)	Clamping Voltage (V)	Peak Pulse Current (A)	Package	Product Status	Operating Temp (°C)
CD214A-T30ALF	Bourns Inc.	30	48.4	8.3	DO-214AC, SMA	Obsolete	-55 to 150
SMAJ30A	MDD	30	48.4	8.3	DO-214AC, SMA	Active	-50 to 150
SMAJ30A-TP	Micro Commercial Co	30	48.4	8.3	DO-214AC, SMA	Active	-55 to 175
SZ1SMA30AT3G	Littelfuse Inc.	30	48.4	8.3	DO-214AC, SMA	Active	-65 to 150
TV04A300J-G	Comchip Technology	30	48.4	8.26	DO-214AC, SMA	Active	-55 to 150
SM4T35AY	STMicroelectronics	30	64.3	36	DO-214AC, SMA	Active	-55 to 150
SMAJ30A-TR	STMicroelectronics	30	64.3	36	DO-214AC, SMA	Active	-55 to 150
SMA6J24A-M3/61	Vishay General Semiconductor - Diodes Division	24	37.8	15.9	DO-214AC, SMA	Active	-55 to 150
SMA6J24A-M3/5A	Vishay General Semiconductor - Diodes Division	24	37.8	15.9	DO-214AC, SMA	Active	-55 to 150

Engineering Selection Recommendations

Direct Replacement Priority:

SMAJ30A (MDD), SMAJ30A-TP (Micro Commercial Co), SZ1SMA30AT3G (Littelfuse Inc.), and TV04A300J-G (Comchip Technology) are direct electrical equivalents with identical 30V standoff, 48.4V clamping, and 8.3A peak pulse specifications. All are active products with ROHS3 compliance and MSL 1 rating. SMAJ30A-TP offers the widest operating temperature range (-55 to 175°C), providing additional thermal margin. SZ1SMA30AT3G includes AEC-Q101 automotive qualification and extended lower temperature rating (-65°C), suitable for automotive and harsh environment applications.

Alternative Consideration:

SM4T35AY and SMAJ30A-TR (both STMicroelectronics) share the 30V standoff voltage and DO-214AC package but feature higher clamping voltage (64.3V) and significantly higher peak pulse current (36A). These are suitable only if the application circuit can tolerate the elevated clamping voltage and does not require the lower clamping characteristic of the original design.

Not Recommended:

SMA6J24A-M3/61 and SMA6J24A-M3/5A (Vishay) operate at 24V standoff voltage, which is below the 30V specification of the CD214A-T30ALF. These parts are not suitable substitutes for this application.

Frequently Asked Questions (FAQ)

Q: Can SMAJ30A directly replace CD214A-T30ALF without circuit modification?

A: Yes. SMAJ30A maintains identical electrical specifications: 30V reverse standoff, 48.4V clamping voltage, and 8.3A peak pulse current. The DO-214AC package and surface mount configuration are identical. No circuit changes are required.

Q: What is the difference between SMAJ30A-TP and SMAJ30A?

A: Both are direct electrical equivalents with identical voltage and current ratings. SMAJ30A-TP (Micro Commercial Co) extends the upper operating temperature to 175°C compared to 150°C for the MDD variant, providing additional thermal headroom in high-temperature environments.

Q: Why are SM4T35AY and SMAJ30A-TR listed as similar but not direct replacements?

A: While these STMicroelectronics parts maintain the 30V standoff voltage and DO-214AC package, they feature significantly different electrical characteristics: 64.3V clamping voltage (versus 48.4V) and 36A peak pulse current (versus 8.3A). These higher ratings alter the transient suppression profile and may not be suitable if the circuit design depends on the lower clamping voltage of the original part.

Q: Are SMA6J24A variants compatible with CD214A-T30ALF?

A: No. SMA6J24A parts operate at 24V reverse standoff voltage, which is below the 30V specification. These are not suitable substitutes.

Q: Which substitute offers automotive qualification?

A: SZ1SMA30AT3G (Littelfuse Inc.) carries AEC-Q101 automotive qualification and is rated for -65 to 150°C operating temperature, making it suitable for automotive and mission-critical applications.

Q: Do all substitutes meet RoHS3 compliance?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the original CD214A-T30ALF.

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