1N5255B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5255B-TP is a 28 V, 500 mW Zener diode manufactured by Micro Commercial Co in DO-35 axial package configuration. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and production continuity. The 1N5255B-TP maintains ROHS3 compliance and is suitable for through-hole applications across industrial and commercial voltage regulation circuits.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	28	V
Tolerance	±5%	—
Power - Maximum	500	mW
Impedance (Maximum)	44	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 21 V
Voltage - Forward (Maximum) @ If	1.1	V @ 200 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—

Substitute Part Grouping Explanation

Substitution of the 1N5255B-TP is determined by strict electrical and mechanical parameter matching. All substitute parts must satisfy the following criteria:

Critical Matching Parameters:

Voltage - Zener (Nominal): 28 V
Power - Maximum: 500 mW
Impedance (Maximum): 44 Ohms
Current - Reverse Leakage @ Vr: 100 nA @ 21 V
Mounting Type: Through Hole
Package / Case: DO-35 or DO-204AH (Axial)

Tolerance Consideration: The 1N5255B-TP specifies ±5% tolerance. Parts with ±2% tolerance (1N5255C series) are electrically compatible and represent improved tolerance performance while maintaining all other electrical parameters.

Temperature Range Consideration: The 1N5255B-TP operates from -55°C to 150°C. Substitute parts with extended temperature ranges (-65°C to 175°C or -65°C to 200°C) are functionally compatible and provide enhanced thermal performance margins.

Packaging Format: Substitute parts are available in Cut Tape (CT), Bulk, and Tape & Reel (TR) formats. All maintain identical electrical performance and DO-35 package geometry.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vf @ 200mA (V)	Temp Range (°C)	Status	Packaging
1N5255B-TP	Micro Commercial Co	28	±5%	500	44	1.1	-55 to 150	Obsolete	Cut Tape (CT)
1N5255B BK PBFREE	Central Semiconductor Corp	28	±5%	500	44	1.1	-65 to 200	Active	Bulk
1N5255B TR PBFREE	Central Semiconductor Corp	28	±5%	500	44	1.1	-65 to 200	Active	Cut Tape (CT)
1N5255B	Microchip Technology	28	±5%	500	44	1.5	-65 to 175	Active	Bulk
1N5255B-TAP	Vishay General Semiconductor - Diodes Division	28	±5%	500	44	1.1	-65 to 175	Active	Cut Tape (CT)
1N5255B-TR	Vishay General Semiconductor - Diodes Division	28	±5%	500	44	1.1	-65 to 175	Active	Cut Tape (CT)
1N5255C-TAP	Vishay General Semiconductor - Diodes Division	28	±2%	500	44	1.1	-65 to 175	Active	Tape & Box (TB)
1N5255C-TR	Vishay General Semiconductor - Diodes Division	28	±2%	500	44	1.1	-65 to 175	Active	Tape & Reel (TR)

Engineering Selection Recommendations

Direct Electrical Equivalents (Identical Specifications):

The following parts provide direct substitution with identical electrical performance and forward voltage characteristics:

1N5255B TR PBFREE (Central Semiconductor Corp): Active status, extended temperature range to 200°C, ROHS3 compliant, high inventory availability (21,833 pcs)
1N5255B-TAP (Vishay General Semiconductor): Active status, AEC-Q101 automotive qualified, ROHS3 compliant, high inventory availability (30,739 pcs)
1N5255B-TR (Vishay General Semiconductor): Active status, AEC-Q101 automotive qualified, ROHS3 compliant, highest inventory availability (50,809 pcs)

Compatible Alternatives with Enhanced Tolerance:

The 1N5255C series provides improved voltage tolerance (±2% versus ±5%) while maintaining all other electrical parameters:

1N5255C-TAP (Vishay General Semiconductor): Active status, AEC-Q101 automotive qualified, ROHS3 compliant
1N5255C-TR (Vishay General Semiconductor): Active status, AEC-Q101 automotive qualified, ROHS3 compliant

Bulk Packaging Options:

For applications requiring bulk component supply:

1N5255B BK PBFREE (Central Semiconductor Corp): Active status, extended temperature range to 200°C, ROHS3 compliant
1N5255B (Microchip Technology): Active status, extended temperature range to 175°C (Note: RoHS non-compliant)

Compliance Considerations:

All recommended active substitutes maintain ROHS3 compliance and REACH unaffected status. The Vishay 1N5255B-TAP and 1N5255B-TR variants include AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade component certification.

Frequently Asked Questions (FAQ)

Q: Can 1N5255C series parts (±2% tolerance) replace 1N5255B-TP (±5% tolerance)?

A: Yes. The 1N5255C series maintains identical electrical performance across all critical parameters (28 V nominal, 500 mW power, 44 Ohms impedance, 100 nA reverse leakage). The tighter ±2% tolerance represents improved voltage accuracy and is functionally compatible with applications designed for ±5% tolerance components.

Q: What is the difference between Cut Tape (CT), Bulk, and Tape & Reel (TR) packaging?

A: Packaging format affects component delivery and handling but does not alter electrical performance. Cut Tape (CT) provides individual component strips suitable for small-quantity assembly. Bulk packaging supplies loose components in containers for high-volume operations. Tape & Reel (TR) format provides components on continuous reels for automated pick-and-place equipment. All formats contain identical DO-35 axial diodes.

Q: Is the 1N5255B from Microchip Technology a suitable replacement?

A: The Microchip 1N5255B is electrically compatible with one exception: forward voltage is specified at 1.5 V @ 200 mA versus 1.1 V for other variants. This 0.4 V difference may affect circuit performance in applications with tight forward voltage specifications. Additionally, this variant is RoHS non-compliant, which may conflict with procurement requirements.

Q: Why do some substitutes have extended temperature ranges (-65°C to 200°C versus -55°C to 150°C)?

A: Extended temperature ranges indicate enhanced thermal performance and broader operational capability. The 1N5255B-TP operates from -55°C to 150°C. Substitutes with ranges extending to -65°C or 200°C provide additional thermal margin and are fully compatible with the original specification. Applications operating within the original temperature range experience no functional difference.

Q: Are Vishay 1N5255B-TAP and 1N5255B-TR parts suitable for automotive applications?

A: Yes. Both Vishay variants carry AEC-Q101 automotive qualification, indicating compliance with automotive industry reliability and performance standards. These parts are suitable for automotive and industrial applications requiring qualified component certification.

Q: What inventory considerations apply to part selection?

A: Inventory availability varies significantly across substitutes. The 1N5255B-TR (Vishay) offers the highest availability at 50,809 pcs, followed by 1N5255B-TAP at 30,739 pcs. The 1N5255B TR PBFREE (Central Semiconductor) provides 21,833 pcs. For applications requiring immediate supply, these three options provide optimal availability.

Q: Can I use 1N5255B-TP in new designs, or must I transition to active alternatives?

A: The 1N5255B-TP is classified as obsolete and should not be used in new designs. Active substitutes must be selected for design continuity and long-term supply assurance. All recommended alternatives provide equivalent or superior electrical performance and compliance status.

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