1N5535 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5535 is a 15 V Zener diode manufactured by Microchip Technology, rated for 500 mW power dissipation with ±20% voltage tolerance. This component functions as a voltage regulator in through-hole DO-35 (DO-204AH) axial package configuration. The part maintains active product status with 714 units in current inventory stock.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges while maintaining identical mechanical packaging and mounting characteristics. Alternative sources provide enhanced availability and alternative tolerance specifications for design flexibility.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	15	V
Power - Maximum	500	mW
Tolerance	±20%	%
Mounting Type	Through Hole	—
Package / Case	DO-35 (DO-204AH)	—
Operating Temperature Range	-65°C to 175°C	°C

Substitute Part Grouping Explanation

Substitute parts for the 1N5535 are qualified based on the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage (nominal): 15 V
Maximum power dissipation: 500 mW
Voltage tolerance: ±20% or tighter
Operating temperature range: minimum -65°C to 175°C

Mechanical Compatibility Criteria:

Package type: DO-35 (DO-204AH) axial through-hole
Mounting configuration: Through hole

Both substitute parts (BZX79C15-T50A and BZX79C15-T50R) from Fairchild Semiconductor meet or exceed these requirements. The substitute parts offer improved voltage tolerance (±5% versus ±20%) and extended maximum operating temperature (200°C versus 175°C), providing enhanced performance margins while maintaining full mechanical and electrical compatibility.

Parameter Comparison

Parameter	1N5535 (Microchip)	BZX79C15-T50A (Fairchild)	BZX79C15-T50R (Fairchild)
Voltage - Zener (Nom)	15 V	15 V	15 V
Tolerance	±20%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW
Current - Reverse Leakage @ Vr	10 nA @ 12.5 V	50 nA @ 10.5 V	50 nA @ 10.5 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.5 V @ 100 mA	1.5 V @ 100 mA
Operating Temperature	-65°C to 175°C	-65°C to 200°C	-65°C to 200°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-35 (DO-204AH)	DO-35 (DO-204AH)	DO-35 (DO-204AH)
Impedance (Max) (Zzt)	—	30 Ohms	30 Ohms

Engineering Selection Recommendations

Primary Selection (1N5535 - Microchip Technology): Select the 1N5535 when the original design specification explicitly requires Microchip Technology sourcing or when existing supply chain qualification mandates this manufacturer. The part maintains active product status with established inventory availability.

Substitute Selection (BZX79C15-T50A or BZX79C15-T50R - Fairchild Semiconductor): The BZX79C15-T50A and BZX79C15-T50R are direct electrical and mechanical substitutes. Both parts are manufactured by Fairchild Semiconductor and provide tighter voltage tolerance (±5% versus ±20%), extended operating temperature range to 200°C, and significantly higher inventory availability (45,200 and 35,677 units respectively). These parts are suitable for applications where improved voltage regulation accuracy and thermal performance margins are beneficial.

Both substitute parts carry identical ECCN (EAR99) and HTSUS (8541.10.0050) classifications, confirming regulatory equivalence.

Frequently Asked Questions (FAQ)

Q: Can BZX79C15-T50A or BZX79C15-T50R be used as direct replacements for 1N5535 in existing designs?

A: Yes. Both Fairchild parts are direct substitutes. They share identical nominal zener voltage (15 V), maximum power rating (500 mW), and DO-35 through-hole package configuration. The substitute parts provide superior voltage tolerance (±5% versus ±20%) and extended temperature range (-65°C to 200°C versus -65°C to 175°C).

Q: What is the difference between BZX79C15-T50A and BZX79C15-T50R?

A: Both parts are electrically and mechanically identical. The designation suffix (T50A versus T50R) indicates different tape and reel packaging formats for automated assembly. Electrical specifications, performance characteristics, and DO-35 package dimensions are equivalent.

Q: Are there any compatibility concerns when substituting these parts?

A: No compatibility concerns exist. All three parts use identical DO-35 (DO-204AH) axial through-hole packaging. Pin configuration, lead spacing, and mechanical dimensions are standardized across all three parts. Direct board-level substitution is possible without circuit modification.

Q: How do voltage tolerances affect circuit performance?

A: The 1N5535 specifies ±20% voltage tolerance, while substitute parts specify ±5%. Tighter tolerance in substitute parts results in more precise voltage regulation. For applications requiring strict voltage accuracy, the ±5% tolerance of BZX79C15-T50A and BZX79C15-T50R provides improved performance margins.

Q: What is the significance of the extended operating temperature range in substitute parts?

A: Substitute parts operate to 200°C maximum junction temperature versus 175°C for the 1N5535. This extended range provides additional thermal margin in high-temperature applications and improves reliability in thermally demanding environments.

Q: Are regulatory and compliance classifications identical across all three parts?

A: Yes. All three parts share identical ECCN classification (EAR99) and HTSUS code (8541.10.0050), confirming regulatory equivalence for export and trade purposes.

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