CD214A-T18CALF Equivalent & Substitute Parts

Part Overview

The CD214A-T18CALF is a transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features an 18V reverse standoff voltage with a 29.2V maximum clamping voltage and 13.7A peak pulse current capability in a DO-214AC (SMA) package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214A-T18CALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	18V
Voltage - Breakdown (Min)	20V
Voltage - Clamping (Max) @ Ipp	29.2V
Current - Peak Pulse (10/1000µs)	13.7A
Power - Peak Pulse	400W
Package / Case	DO-214AC, SMA
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the CD214A-T18CALF is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff: 18V (exact match required)
Voltage - Breakdown (Min): 20V (exact match required)
Voltage - Clamping (Max) @ Ipp: 29.2V (exact match required)
Current - Peak Pulse (10/1000µs): 13.7A (exact match required)
Power - Peak Pulse: 400W (exact match required)
Package / Case: DO-214AC, SMA (exact match required)
Mounting Type: Surface Mount (exact match required)

Secondary Compatibility Factors:

Bidirectional Channels: 1 (single channel)
Type: Zener
RoHS Status: ROHS3 Compliant

Substitute parts are classified into two categories:

Direct Equivalents: Parts with identical electrical specifications (18V standoff, 20V breakdown, 29.2V clamping, 13.7A peak pulse) and identical package configuration.

Similar Parts: Parts with the same 18V standoff voltage and DO-214AC package but with different clamping voltages or peak pulse currents. These are suitable only when circuit design permits higher clamping voltages or peak pulse ratings.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Operating Temperature	Product Status
CD214A-T18CALF	Bourns Inc.	18V	20V	29.2V	13.7A	400W	DO-214AC, SMA	-55°C ~ 150°C (TJ)	Obsolete
SMAJ18CA	MDD	18V	20V	29.2V	13.7A	400W	DO-214AC, SMA	-50°C ~ 150°C (TJ)	Active
SM4T21CAY	STMicroelectronics	18V	20V	39.3V	59A (8/20µs)	400W	DO-214AC, SMA	-55°C ~ 150°C (TJ)	Active
SMA6J18CA-TR	STMicroelectronics	18V	20V	33.2V	102A (8/20µs)	600W	DO-214AC, SMA	-55°C ~ 175°C (TJ)	Active
SMAJ15CA-M3/5A	Vishay General Semiconductor - Diodes Division	15V	16.7V	24.4V	16.4A	400W	DO-214AC, SMA	-55°C ~ 150°C (TJ)	Active
SMAJ15CA-M3/61	Vishay General Semiconductor - Diodes Division	15V	16.7V	24.4V	16.4A	400W	DO-214AC, SMA	-55°C ~ 150°C (TJ)	Active
SMAJ16CA-M3/61	Vishay General Semiconductor - Diodes Division	16V	17.8V	26V	15.4A	400W	DO-214AC, SMA	-55°C ~ 150°C (TJ)	Active
SMAJ18CA-TP	Micro Commercial Co	18V	20V	29.2V	13.7A	400W	DO-214AC, SMA	-55°C ~ 175°C (TA)	Active
SMAJ18CA-TR	STMicroelectronics	18V	20V	39.3V	59A (8/20µs)	400W	DO-214AC, SMA	-55°C ~ 150°C (TJ)	Active

Engineering Selection Recommendations

Direct Equivalent Substitutes (Recommended for Pin-for-Pin Replacement):

SMAJ18CA (MDD) and SMAJ18CA-TP (Micro Commercial Co) are direct electrical equivalents to the CD214A-T18CALF. Both parts maintain identical voltage ratings (18V standoff, 20V breakdown, 29.2V clamping) and current specifications (13.7A peak pulse), with the same DO-214AC package configuration. SMAJ18CA-TP offers an extended operating temperature range to 175°C, providing additional thermal margin. Both parts are ROHS3 compliant and currently in active production status.

Higher-Performance Alternatives (Circuit-Dependent Selection):

SM4T21CAY (STMicroelectronics) and SMAJ18CA-TR (STMicroelectronics) maintain the 18V standoff voltage and DO-214AC package but feature higher clamping voltages (39.3V) and significantly higher peak pulse currents (59A). These parts are suitable only when circuit design specifications permit the higher clamping voltage without affecting downstream component protection. Both are ROHS3 compliant and AEC-Q101 qualified (SM4T21CAY).

SMA6J18CA-TR (STMicroelectronics) provides the highest performance option with 18V standoff voltage, 33.2V clamping, 102A peak pulse current, and 600W power rating. This part extends the operating temperature range to 175°C and is suitable for applications requiring enhanced transient suppression capability. Selection requires verification that the higher clamping voltage is compatible with circuit requirements.

Lower Voltage Alternatives (Not Recommended for Direct Replacement):

SMAJ15CA-M3/5A, SMAJ15CA-M3/61, and SMAJ16CA-M3/61 feature lower standoff voltages (15V and 16V respectively) and are not suitable as direct replacements for the 18V CD214A-T18CALF. These parts may be considered only if circuit redesign permits operation at lower protection thresholds.

Frequently Asked Questions (FAQ)

Q: Can SMAJ18CA directly replace CD214A-T18CALF without circuit modification?

A: Yes. SMAJ18CA (MDD) is a direct electrical equivalent with identical voltage ratings (18V standoff, 20V breakdown, 29.2V clamping) and current specifications (13.7A peak pulse). The DO-214AC package configuration is identical, enabling pin-for-pin replacement without circuit modification.

Q: What is the difference between SMAJ18CA-TP and SMAJ18CA-TR?

A: Both parts maintain identical electrical specifications (18V standoff, 20V breakdown, 29.2V clamping, 13.7A peak pulse). SMAJ18CA-TP (Micro Commercial Co) operates to 175°C, while SMAJ18CA-TR (STMicroelectronics) features a higher clamping voltage of 39.3V and peak pulse current of 59A. SMAJ18CA-TP is the direct equivalent; SMAJ18CA-TR is a higher-performance alternative requiring circuit compatibility verification.

Q: Why do SM4T21CAY and SMAJ18CA-TR have higher clamping voltages than the original CD214A-T18CALF?

A: These parts are designed for higher transient energy absorption. The 39.3V clamping voltage (versus 29.2V) and 59A peak pulse current (versus 13.7A) provide enhanced protection for applications with more severe transient conditions. These parts are suitable only when circuit design permits the higher clamping voltage without compromising downstream component protection.

Q: Are SMAJ15CA and SMAJ16CA suitable replacements?

A: No. These parts feature lower standoff voltages (15V and 16V respectively) and lower clamping voltages (24.4V and 26V). They are not suitable as direct replacements for the 18V CD214A-T18CALF and would require circuit redesign to accommodate the lower protection thresholds.

Q: What is the significance of the DO-214AC package specification?

A: The DO-214AC package (also designated SMA) is a surface-mount diode package with standardized lead dimensions and footprint. All substitute parts listed maintain this package configuration, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this document are ROHS3 compliant, meeting environmental and regulatory requirements equivalent to the original CD214A-T18CALF.

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

A: SMAJ18CA-TP (Micro Commercial Co) and SMA6J18CA-TR (STMicroelectronics) both extend the operating temperature range to 175°C, compared to the original 150°C specification. SMAJ18CA-TP maintains identical electrical specifications, while SMA6J18CA-TR provides higher performance with increased clamping voltage and peak pulse current.

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