SA14C-B Equivalent & Substitute Parts

Part Overview

The SA14C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This bidirectional Zener diode provides transient overvoltage protection with a 14V reverse standoff voltage and 23.2V maximum clamping voltage. The part is classified as obsolete, making identification of suitable substitute components necessary for ongoing system support and new design implementations where equivalent performance is required.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	14	V
Voltage - Breakdown (Min)	15.6	V
Voltage - Clamping (Max) @ Ipp	23.2	V
Current - Peak Pulse (10/1000µs)	22	A
Power - Peak Pulse	500	W
Operating Temperature Range	-65 to 175	°C (TJ)
Package / Case	DO-204AC (DO-15)	Axial
Mounting Type	Through Hole
Bidirectional Channels	1
Type	Zener

Substitute Part Grouping Explanation

Substitution of the SA14C-B is determined by strict equivalence across the following critical parameters:

Voltage Parameters: Reverse standoff voltage of 14V, minimum breakdown voltage of 15.6V, and maximum clamping voltage of 23.2V must be maintained to ensure proper transient suppression without affecting normal circuit operation.

Current Rating: Peak pulse current of 22A (10/1000µs waveform) establishes the transient energy handling capability. Substitute parts must meet or exceed this specification.

Power Dissipation: Peak pulse power rating of 500W defines the thermal stress during transient events.

Package Compatibility: DO-204AC (DO-15) axial through-hole package ensures mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Electrical Type: Bidirectional Zener diode configuration with single channel is required for the intended protection function.

The SA14CA from Taiwan Semiconductor Corporation satisfies all critical substitution criteria while maintaining electrical and mechanical compatibility.

Parameter Comparison

Parameter	SA14C-B (Littelfuse)	SA14CA (Taiwan Semiconductor)	Match Status
Voltage - Reverse Standoff (Typ)	14V	14V	Equivalent
Voltage - Breakdown (Min)	15.6V	15.6V	Equivalent
Voltage - Clamping (Max) @ Ipp	23.2V	23.2V	Equivalent
Current - Peak Pulse (10/1000µs)	22A	22.6A	Substitute Exceeds
Power - Peak Pulse	500W	500W	Equivalent
Operating Temperature Range	-65 to 175°C	-55 to 175°C	Substitute Limited
Package / Case	DO-204AC (DO-15)	DO-204AC (DO-15)	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Bidirectional Channels	1	1	Equivalent
Type	Zener	Zener	Equivalent
RoHS Status	RoHS Compliant	ROHS3 Compliant	Both Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

The SA14CA is a direct functional substitute for the SA14C-B across all critical electrical parameters. Both devices maintain identical voltage specifications (14V standoff, 15.6V breakdown, 23.2V clamping) and power dissipation (500W peak pulse). The SA14CA provides marginally higher peak pulse current (22.6A versus 22A), offering improved transient handling capability.

The SA14CA is classified as Active product status, ensuring ongoing availability and manufacturing support, whereas the SA14C-B is obsolete. Both devices are RoHS compliant and carry unlimited moisture sensitivity rating (MSL 1).

A design consideration exists regarding operating temperature range: the SA14C-B operates from -65°C to 175°C, while the SA14CA operates from -55°C to 175°C. Applications requiring operation below -55°C junction temperature must evaluate this specification difference against system requirements.

Both devices are packaged identically in DO-204AC (DO-15) axial through-hole format, permitting direct mechanical substitution on existing PCB designs without layout modification.

Frequently Asked Questions (FAQ)

Q: Can the SA14CA directly replace the SA14C-B in existing designs?

A: Yes. The SA14CA provides electrical equivalence across all critical parameters: identical voltage ratings (14V standoff, 15.6V breakdown, 23.2V clamping), equivalent power dissipation (500W), and identical package format (DO-204AC DO-15 axial through-hole). Direct substitution is supported without circuit modification.

Q: What is the difference in peak pulse current between these devices?

A: The SA14C-B is rated for 22A peak pulse current, while the SA14CA is rated for 22.6A. The SA14CA exceeds the original specification, providing enhanced transient energy handling without compromising circuit protection.

Q: Are there temperature range limitations with the SA14CA?

A: The SA14C-B operates across -65°C to 175°C junction temperature, while the SA14CA operates across -55°C to 175°C. For applications requiring operation below -55°C, the lower temperature limit of the SA14CA must be evaluated against system specifications.

Q: Do both devices meet RoHS compliance requirements?

A: Yes. The SA14C-B is RoHS Compliant, and the SA14CA is ROHS3 Compliant. Both devices satisfy RoHS environmental standards.

Q: Is the packaging identical between these devices?

A: Yes. Both the SA14C-B and SA14CA use DO-204AC (DO-15) axial through-hole packaging. No PCB layout or assembly process modifications are required for substitution.

Q: What is the moisture sensitivity rating for both devices?

A: Both devices carry Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without moisture control requirements.

Q: Why is the SA14C-B classified as obsolete?

A: The SA14C-B is no longer in active production. The SA14CA, manufactured by Taiwan Semiconductor Corporation, is the active equivalent product providing identical electrical performance with ongoing manufacturing support.

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