CD214A-T170CALF Equivalent & Substitute Parts

Part Overview

The CD214A-T170CALF is a transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection applications. This surface-mount component features a 170V reverse standoff voltage with 275V maximum clamping voltage and 1.4A peak pulse current capability in a DO-214AC (SMA) package. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	170V
Voltage - Breakdown (Min)	189V
Voltage - Clamping (Max) @ Ipp	275V
Current - Peak Pulse (10/1000µs)	1.4A
Power - Peak Pulse	400W
Package / Case	DO-214AC (SMA)
Operating Temperature	-55°C ~ 150°C
Type	Zener
Bidirectional Channels	1
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the CD214A-T170CALF is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 170V
Voltage - Breakdown (Min): 189V
Voltage - Clamping (Max) @ Ipp: 275V
Package / Case: DO-214AC (SMA)
Mounting Type: Surface Mount
Type: Zener, Bidirectional

Substitute parts are grouped into two categories:

Direct Equivalents: Parts meeting all critical electrical parameters and package specifications with current ratings within acceptable operational margins (1.4A to 1.5A peak pulse current).

Similar Alternatives: Parts maintaining core voltage specifications and package compatibility but with variations in peak pulse current or clamping voltage that remain within the same functional class for general-purpose protection applications.

Parameter Comparison

Parameter	CD214A-T170CALF (Bourns)	SMAJ170CA (Meritek)	SMAJ170CA-TP (Micro Commercial Co)	SMAJ170CA-TR (STMicroelectronics)
Voltage - Reverse Standoff (Typ)	170V	170V	170V	170V
Voltage - Breakdown (Min)	189V	189V	189V	189V
Voltage - Clamping (Max) @ Ipp	275V	275V	275V	353V
Current - Peak Pulse (10/1000µs)	1.4A	1.45A	1.5A	6.5A (8/20µs)
Power - Peak Pulse	400W	400W	400W	400W
Package / Case	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)
Operating Temperature	-55°C ~ 150°C (TJ)	-55°C ~ 150°C	-55°C ~ 175°C (TA)	-55°C ~ 150°C (TJ)
Type	Zener	Zener	Zener	Zener
Bidirectional Channels	1	1	1	1
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SMAJ170CA (Meritek): This direct equivalent maintains identical voltage specifications (170V standoff, 189V breakdown, 275V clamping) with marginally higher peak pulse current (1.45A vs. 1.4A). The part is active in production with ROHS3 compliance and unlimited moisture sensitivity rating. This represents the closest functional replacement for the obsolete CD214A-T170CALF.

SMAJ170CA-TP (Micro Commercial Co): This alternative provides equivalent voltage performance with slightly elevated peak pulse current (1.5A) and extended operating temperature range (-55°C to 175°C vs. -55°C to 150°C). Active product status and ROHS3 compliance support long-term availability. The higher temperature rating offers design margin for thermally demanding applications.

SMAJ170CA-TR (STMicroelectronics): This part maintains the 170V standoff and 189V breakdown specifications but features elevated clamping voltage (353V) and significantly higher peak pulse current (6.5A at 8/20µs). This configuration is suitable only for applications where higher transient energy absorption is required. The higher clamping voltage may exceed protection thresholds in circuits designed for 275V clamping, requiring circuit-level validation.

All substitute parts are ROHS3 compliant with unlimited moisture sensitivity (MSL 1), supporting deployment in standard manufacturing environments without special handling requirements.

Frequently Asked Questions (FAQ)

Q: Can SMAJ170CA-TR be used as a direct replacement for CD214A-T170CALF?

A: SMAJ170CA-TR maintains the same 170V reverse standoff voltage and DO-214AC package but differs in clamping voltage (353V vs. 275V) and peak pulse current (6.5A vs. 1.4A). Use is limited to applications where higher transient suppression capability is acceptable or required. Circuits designed for 275V clamping may experience different voltage regulation behavior with this part.

Q: What is the primary difference between SMAJ170CA and SMAJ170CA-TP?

A: Both parts provide identical voltage specifications (170V standoff, 275V clamping). SMAJ170CA-TP offers extended operating temperature range (-55°C to 175°C vs. -55°C to 150°C) and marginally higher peak pulse current (1.5A vs. 1.45A). Selection depends on thermal environment requirements.

Q: Are all substitute parts available in the same packaging?

A: Yes. All listed substitutes use DO-214AC (SMA) surface-mount packaging, ensuring mechanical and thermal compatibility with the original CD214A-T170CALF footprint.

Q: What compliance certifications apply to these parts?

A: All parts are ROHS3 compliant with unlimited moisture sensitivity level (MSL 1). REACH status varies: Meritek SMAJ170CA is REACH Unaffected; Micro Commercial Co SMAJ170CA-TP and STMicroelectronics SMAJ170CA-TR are REACH Unaffected.

Q: Why is the CD214A-T170CALF classified as obsolete?

A: Obsolescence reflects manufacturer discontinuation. Active alternatives with equivalent or superior specifications are available from multiple suppliers, supporting design continuity and procurement flexibility.

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