SLD28U-017-B Equivalent & Substitute Parts

Part Overview

The SLD28U-017-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for through-hole applications in axial P600 packaging. This component operates with a 28V reverse standoff voltage and provides 5000W peak pulse power dissipation with a 45.4V maximum clamping voltage. The part maintains Active product status and carries AEC-Q101 automotive qualification with ROHS3 compliance.

Equivalent and substitute parts are identified when electrical and mechanical parameters align within the specifications required for direct component replacement in circuit applications.

Key Parameters

Parameter	SLD28U-017-B
Manufacturer	Littelfuse Inc.
Type	Zener TVS Diode
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	28V
Voltage - Breakdown (Min)	31.1V
Voltage - Clamping (Max) @ Ipp	45.4V
Current - Peak Pulse (10/1000µs)	112.3A
Power - Peak Pulse	5000W
Operating Temperature Range	-55°C to 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
Product Status	Active
RoHS Status	ROHS3 Compliant
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitute parts for the SLD28U-017-B are qualified based on the following critical parameters:

Electrical Equivalence Criteria:

Voltage - Reverse Standoff (Typ): 28V
Voltage - Breakdown (Min): 31.1V
Voltage - Clamping (Max) @ Ipp: 45.4V
Type: Unidirectional Zener TVS Diode
Operating Temperature Range: -55°C to 175°C (TJ)

Mechanical Compatibility Criteria:

Mounting Type: Through Hole
Package compatibility: P600 axial or equivalent axial packages (R-6)

Compliance Requirements:

RoHS3 Compliant
Active product status

The following substitute parts meet these criteria with variations in peak pulse current and power dissipation capacity, which do not prevent functional substitution in applications designed for the SLD28U-017-B specifications.

Parameter Comparison

Parameter	SLD28U-017-B	5KP28A	3KP28A-TP	5KP28A-E3/54
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Micro Commercial Co	Vishay General Semiconductor
Type	Zener TVS	Zener TVS	Zener TVS	Zener TVS
Unidirectional Channels	1	1	1	1
Voltage - Reverse Standoff (Typ)	28V	28V	28V	28V
Voltage - Breakdown (Min)	31.1V	31.1V	31.1V	31.1V
Voltage - Clamping (Max) @ Ipp	45.4V	45.4V	45.4V	45.4V
Current - Peak Pulse (10/1000µs)	112.3A	112.3A	Not specified	110A
Power - Peak Pulse	5000W	5000W	3000W	5000W
Operating Temperature Range	-55°C to 175°C	-55°C to 175°C	-55°C to 175°C	-55°C to 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	P600, Axial	P600, Axial	R-6, Axial	P600, Axial
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

5KP28A (Littelfuse Inc.) - Primary substitute with identical electrical and mechanical specifications. Matches all critical parameters including 5000W peak pulse power, 112.3A peak pulse current, and P600 axial packaging. Active product status with ROHS3 compliance. Cut Tape packaging available with 14,800 units in stock.

5KP28A-E3/54 (Vishay General Semiconductor - TransZorb® Series) - Functionally equivalent substitute with matching voltage parameters, 5000W peak pulse power, and P600 axial packaging. Peak pulse current specified at 110A, within acceptable tolerance of the original 112.3A specification. Active product status with ROHS3 compliance. Cut Tape packaging available with 8,400 units in stock.

3KP28A-TP (Micro Commercial Co) - Substitute with matching voltage parameters and through-hole axial mounting. Operates at reduced 3000W peak pulse power compared to the original 5000W specification. Packaged in R-6 axial format rather than P600. Active product status with ROHS3 compliance. Cut Tape packaging available with 1,813 units in stock. Suitable for applications where peak pulse power requirements do not exceed 3000W.

All substitute parts maintain Active product status, ROHS3 compliance, and the required -55°C to 175°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can 5KP28A directly replace SLD28U-017-B? A: Yes. The 5KP28A matches all critical electrical parameters (28V standoff, 31.1V breakdown, 45.4V clamping) and mechanical specifications (P600 axial through-hole package). Both components are rated for 5000W peak pulse power and 112.3A peak pulse current.

Q: What is the difference between 5KP28A and 5KP28A-E3/54? A: Both parts share identical voltage ratings (28V standoff, 31.1V breakdown, 45.4V clamping), 5000W peak pulse power, and P600 axial packaging. The 5KP28A-E3/54 specifies 110A peak pulse current versus 112.3A for the 5KP28A. This difference does not prevent functional substitution.

Q: Can 3KP28A-TP replace SLD28U-017-B? A: The 3KP28A-TP matches voltage specifications (28V standoff, 31.1V breakdown, 45.4V clamping) and through-hole axial mounting. However, it operates at 3000W peak pulse power versus the original 5000W specification. Substitution is valid only for applications where peak pulse power requirements do not exceed 3000W. The R-6 axial package differs from the P600 package but maintains through-hole compatibility.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts listed (5KP28A, 5KP28A-E3/54, and 3KP28A-TP) are ROHS3 compliant and maintain the same environmental compliance status as the SLD28U-017-B.

Q: What is the operating temperature range for substitute parts? A: All substitute parts operate across the same temperature range as the original: -55°C to 175°C (TJ).

Q: Does packaging format affect substitution? A: The SLD28U-017-B uses P600 axial packaging. The 5KP28A and 5KP28A-E3/54 maintain P600 compatibility. The 3KP28A-TP uses R-6 axial packaging, which is mechanically different but maintains through-hole mounting compatibility. Verify PCB footprint compatibility before substitution.

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