1N5250B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5250B-TP is a 20 V, 500 mW Zener diode in DO-35 axial through-hole packaging manufactured by Micro Commercial Co. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement. The 1N5250B-TP serves voltage regulation and transient protection applications requiring a nominal Zener voltage of 20 V with ±5% tolerance and 500 mW power dissipation capability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	20	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	25	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 15 V	—
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	—
Operating Temperature	-55°C ~ 150°C	—
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the 1N5250B-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 20 V (exact match required)
Power - Max: 500 mW (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: DO-35 or DO-204AH (exact match required)
Impedance (Max): 25 Ohms (baseline specification)

Secondary Compatibility Factors:

Tolerance: ±5% or tighter (±2% acceptable as upgrade)
Current - Reverse Leakage: 100 nA @ 15 V or lower
Voltage - Forward (Vf): 1.1 V to 1.5 V @ 200 mA (acceptable range)
Operating Temperature: Minimum -55°C to +150°C (wider ranges acceptable)

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical specifications and packaging) and Compatible Alternatives (same core parameters with enhanced specifications or different tolerance grades).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf @ 200mA	Temp Range	Packaging	Status
1N5250B-TP	Micro Commercial Co	20 V	±5%	500 mW	25 Ω	1.1 V	-55°C ~ 150°C	DO-35	Obsolete
1N5250B TR PBFREE	Central Semiconductor Corp	20 V	±5%	500 mW	25 Ω	1.1 V	-65°C ~ 200°C	DO-35	Active
1N5250B	Microchip Technology	20 V	±5%	500 mW	25 Ω	1.5 V	-65°C ~ 175°C	DO-35	Active
1N5250B-TAP	Vishay General Semiconductor	20 V	±5%	500 mW	25 Ω	1.1 V	-55°C ~ 175°C	DO-35	Active
1N5250B-TR	Vishay General Semiconductor	20 V	±5%	500 mW	25 Ω	1.1 V	—	DO-35	Active
1N5250BTR	Fairchild Semiconductor	20 V	±5%	500 mW	25 Ω	1.2 V	-65°C ~ 200°C	DO-35	Active
1N5250C-TAP	Vishay General Semiconductor	20 V	±2%	500 mW	25 Ω	1.1 V	-55°C ~ 175°C	DO-35	Active
1N5250C-TR	Vishay General Semiconductor	20 V	±2%	500 mW	25 Ω	1.1 V	-55°C ~ 175°C	DO-35	Active
BZX55B20-TAP	Vishay General Semiconductor	20 V	±2%	500 mW	55 Ω	1.5 V	-65°C ~ 175°C	DO-35	Active
BZX55B20-TR	Vishay General Semiconductor	20 V	±2%	500 mW	55 Ω	1.5 V	-65°C ~ 175°C	DO-35	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

The following parts provide direct electrical and mechanical equivalence to the 1N5250B-TP:

1N5250B TR PBFREE (Central Semiconductor Corp) — Active status with extended operating temperature range (-65°C ~ 200°C). RoHS3 compliant. Identical electrical specifications with 25 Ω impedance and 1.1 V forward voltage. Tape & Reel packaging suitable for automated assembly.
1N5250B-TAP (Vishay General Semiconductor) — Active status with AEC-Q101 automotive qualification. Identical electrical specifications with 25 Ω impedance and 1.1 V forward voltage. Cut Tape packaging. RoHS3 compliant. High inventory availability (30,400 pcs).
1N5250B-TR (Vishay General Semiconductor) — Active status with identical electrical specifications. 25 Ω impedance and 1.1 V forward voltage. Cut Tape packaging. RoHS3 compliant. High inventory availability (29,921 pcs).

Compatible Alternatives (Enhanced Specifications):

1N5250C-TAP and 1N5250C-TR (Vishay General Semiconductor) — Active status with tighter ±2% tolerance (versus ±5%). Identical 25 Ω impedance and 1.1 V forward voltage. AEC-Q101 automotive qualified. RoHS3 compliant. Suitable for applications requiring improved voltage accuracy.
1N5250BTR (Fairchild Semiconductor) — Active status with extended operating temperature range (-65°C ~ 200°C). Identical 25 Ω impedance. Forward voltage 1.2 V @ 200 mA. Bulk packaging.

Acceptable Alternatives (Different Impedance Characteristics):

BZX55B20-TAP and BZX55B20-TR (Vishay General Semiconductor) — Active status with tighter ±2% tolerance. Higher impedance specification (55 Ω versus 25 Ω). Forward voltage 1.5 V @ 200 mA. Extended temperature range (-65°C ~ 175°C). AEC-Q101 automotive qualified. RoHS3 compliant. Suitable for applications where higher impedance is acceptable.

Compliance Considerations:

The 1N5250B TR PBFREE, 1N5250B-TAP, 1N5250B-TR, 1N5250C-TAP, 1N5250C-TR, BZX55B20-TAP, and BZX55B20-TR are RoHS3 compliant.
The Microchip Technology 1N5250B is RoHS non-compliant.
All listed parts are REACH Unaffected and classified as EAR99 for export control purposes.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 1N5250B-TP with any 20 V Zener diode?

A: No. Substitution requires matching the following parameters: 20 V nominal Zener voltage, 500 mW maximum power dissipation, DO-35 through-hole axial package, and impedance specification of 25 Ω (or higher if application permits). The 1N5250B-TP has a 25 Ω maximum impedance; parts with higher impedance (such as BZX55B20 series at 55 Ω) are acceptable only if circuit design tolerates increased impedance.

Q: What is the difference between 1N5250B and 1N5250C?

A: The primary difference is tolerance specification. The 1N5250B has ±5% tolerance, while the 1N5250C has ±2% tolerance. Both maintain identical 20 V nominal Zener voltage, 500 mW power rating, and 25 Ω impedance. The 1N5250C is suitable for applications requiring tighter voltage regulation accuracy.

Q: Are the BZX55B20 series parts direct substitutes?

A: The BZX55B20 series (BZX55B20-TAP, BZX55B20-TR) match the 20 V voltage, 500 mW power, and DO-35 package of the 1N5250B-TP. However, they have a higher impedance specification (55 Ω versus 25 Ω) and tighter ±2% tolerance. These parts are compatible substitutes if the application circuit design accommodates the higher impedance characteristic.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in three packaging formats: Cut Tape (CT), Tape & Reel (TR), and Bulk. The original 1N5250B-TP uses unspecified packaging. Cut Tape and Tape & Reel formats are suitable for automated assembly processes. Bulk packaging is appropriate for manual assembly or lower-volume applications.

Q: Which substitute offers the widest operating temperature range?

A: The 1N5250B TR PBFREE and 1N5250BTR both provide -65°C to +200°C operating temperature range, compared to the original 1N5250B-TP specification of -55°C to +150°C. This extended range is beneficial for applications in extreme thermal environments.

Q: Are all substitute parts RoHS compliant?

A: Most active substitutes are RoHS3 compliant, including the 1N5250B TR PBFREE, 1N5250B-TAP, 1N5250B-TR, 1N5250C-TAP, 1N5250C-TR, BZX55B20-TAP, and BZX55B20-TR. The Microchip Technology 1N5250B is RoHS non-compliant. Verify RoHS compliance requirements for your specific application before selection.

Q: What is the significance of the "-TAP" and "-TR" suffixes?

A: The "-TAP" suffix indicates Cut Tape packaging, while "-TR" indicates Tape & Reel packaging. Both formats are suitable for automated pick-and-place assembly. Cut Tape is typically used for lower-volume production runs, while Tape & Reel is standard for high-volume manufacturing.

Q: Can I use the Microchip Technology 1N5250B as a substitute?

A: The Microchip Technology 1N5250B provides identical electrical specifications (20 V, 500 mW, ±5% tolerance, 25 Ω impedance) and DO-35 packaging. However, it is RoHS non-compliant, which may restrict its use in applications subject to RoHS regulations. Verify regulatory requirements before selection.

Q: What is the difference between forward voltage specifications across substitute parts?

A: Forward voltage (Vf) at 200 mA ranges from 1.1 V to 1.5 V across the substitute parts. The 1N5250B-TP specifies 1.1 V. Parts with 1.1 V to 1.2 V (1N5250B TR PBFREE, 1N5250B-TAP, 1N5250B-TR, 1N5250C-TAP, 1N5250C-TR, 1N5250BTR) provide closer matching. Parts with 1.5 V (Microchip 1N5250B, BZX55B20-TAP, BZX55B20-TR) have higher forward voltage drop and may affect circuit performance in sensitive applications.

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