SLD14U-017-B Equivalent & Substitute Parts

Part Overview

The SLD14U-017-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for transient overvoltage protection in electronic circuits. This component operates with a 14V reverse standoff voltage and provides 5000W peak pulse power dissipation capability in a P600 axial through-hole package. The part is currently active in production and carries AEC-Q101 automotive qualification.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the critical operating parameters that define TVS diode functionality and circuit protection requirements.

Substiute Parts

SLD14U-017-B

Littelfuse Inc.In Stock: 805SLD14U-017-B Datasheet

Current PartRFQ

5KP14A

Littelfuse Inc.In Stock: 41375KP14A Datasheet

MFR RecommendedRFQ

SA14A

Fairchild SemiconductorIn Stock: 300422SA14A Datasheet

MFR RecommendedRFQ

5KP14A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 83105KP14A-E3/54 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for TVS diodes is determined by matching the following critical parameters:

• Voltage Rating: Reverse standoff voltage (14V), breakdown voltage minimum (15.6V), and clamping voltage maximum (23.2V) must be identical to ensure proper circuit protection without nuisance triggering or excessive clamping voltage.
• Current Handling: Peak pulse current capability must meet or exceed the application requirement (219.8A nominal).
• Power Dissipation: Peak pulse power rating must support the transient energy absorption (5000W).
• Package Compatibility: Through-hole P600 axial package ensures mechanical and electrical compatibility with existing PCB layouts.
• Operating Temperature: Full temperature range (-55°C to 175°C) must be supported.
• Unidirectional Configuration: Single channel Zener-type TVS diode topology.

The following parts meet these substitution criteria:

1. 5KP14A (Littelfuse Inc.) - Identical electrical specifications, active product status, Cut Tape packaging option.
2. 5KP14A-E3/54 (Vishay General Semiconductor) - Equivalent voltage and power ratings with 216A peak pulse current, active product status, P600 package.
3. SA14A (Fairchild Semiconductor) - Matching voltage specifications but with reduced peak pulse current (22A) and power rating (500W), obsolete product status.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs)

The 5KP14A (Littelfuse Inc.) and 5KP14A-E3/54 (Vishay General Semiconductor) are functionally equivalent to the SLD14U-017-B. Both maintain identical voltage specifications, equivalent peak pulse current ratings (219.8A and 216A respectively), and 5000W power dissipation in the P600 through-hole package. Both parts carry active product status and full RoHS3 compliance, ensuring long-term availability and regulatory conformance.

Secondary Substitute (Limited Application)

The SA14A (Fairchild Semiconductor) matches the voltage rating but provides significantly reduced current handling (22A) and power dissipation (500W). This part is obsolete and should not be selected for new designs. Use only in legacy system maintenance where the reduced power rating is acceptable for the specific application.

Compliance and Certification

All recommended substitutes maintain ROHS3 compliance and operate across the full -55°C to 175°C temperature range. The SLD14U-017-B carries AEC-Q101 automotive qualification; verify that substitute parts meet equivalent automotive qualification requirements if the application demands automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can the 5KP14A replace the SLD14U-017-B directly?

A: Yes. The 5KP14A is electrically and mechanically equivalent, with identical voltage ratings (14V standoff, 23.2V clamping), peak pulse current (219.8A), and power dissipation (5000W). Both use the P600 through-hole axial package. The primary difference is packaging format (Bulk vs. Cut Tape).

Q: What is the difference between the 5KP14A and 5KP14A-E3/54?

A: Both parts are from the same 5KP14 series with equivalent voltage specifications and 5000W power ratings. The 5KP14A-E3/54 has a peak pulse current of 216A compared to 219.8A for the 5KP14A. This 1.7% difference is within typical component tolerance and does not affect substitution eligibility. The suffix "-E3/54" indicates Vishay's specific packaging and tape configuration.

Q: Why is the SA14A listed as a substitute if it has lower current and power ratings?

A: The SA14A meets the voltage substitution criteria (14V standoff, 23.2V clamping) but with reduced current handling (22A vs. 219.8A) and power dissipation (500W vs. 5000W). It is included for reference in legacy system maintenance only. For applications requiring full 5000W protection, the SA14A is not suitable.

Q: Does package type affect substitution?

A: The SLD14U-017-B is supplied in Bulk packaging, while the 5KP14A is available in Cut Tape format. Both use the identical P600 through-hole axial package. Packaging format affects supply chain logistics but not electrical or mechanical compatibility. The SA14A uses a different package (DO-204AC/DO-15) and requires PCB layout verification before substitution.

Q: Are all substitutes RoHS3 compliant?

A: Yes. The SLD14U-017-B, 5KP14A, and 5KP14A-E3/54 are all ROHS3 compliant. The SA14A is also ROHS3 compliant but is obsolete.

Q: What is the impact of the 3.8A current difference between the 5KP14A and 5KP14A-E3/54?

A: The difference (219.8A vs. 216A) represents a 1.7% variance and falls within standard component manufacturing tolerance. Both parts maintain the 5000W peak pulse power rating and are functionally interchangeable for circuit protection applications.