1N5250C-TAP Equivalent & Substitute Parts

Part Overview

The 1N5250C-TAP is an active Zener diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 20 V nominal Zener voltage with 500 mW maximum power dissipation. This component is packaged in DO-204AH (DO-35) axial through-hole configuration and is qualified to AEC-Q101 automotive standards with RoHS3 compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter range.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	20	V
Power - Max	500	mW
Tolerance	±2%	—
Impedance (Max)	25	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 15 V
Voltage - Forward (Max) @ If	1.1	V @ 200 mA
Operating Temperature	175	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—

Substitute Part Grouping Explanation

Substitution of Zener diodes is determined by equivalence in the following critical parameters: nominal Zener voltage (Vz), maximum power dissipation rating, package type, and mounting configuration. All identified substitute parts maintain the 20 V nominal Zener voltage and through-hole axial mounting in DO-35 (DO-204AH) package format, ensuring mechanical and electrical compatibility in circuit applications.

Tolerance variations and impedance differences are secondary considerations that do not prevent functional substitution when the primary parameters align. Forward voltage and reverse leakage characteristics may vary within acceptable ranges for typical Zener diode applications.

The following substitute parts are grouped by manufacturer and maintain core electrical specifications:

Group 1: Microchip Technology and Fairchild Semiconductor

1N5250B (Microchip Technology)
1N5250BTR (Fairchild Semiconductor)

Group 2: NXP Semiconductors

BZX79-B20,113 (NXP Semiconductors)
BZX79-B20,143 (NXP Semiconductors)

Parameter Comparison

Parameter	1N5250C-TAP (Main)	1N5250B	1N5250BTR	BZX79-B20,113	BZX79-B20,143
Manufacturer	Vishay	Microchip	Fairchild	NXP	NXP
Voltage - Zener (Nom)	20 V	20 V	20 V	20 V	20 V
Tolerance	±2%	±5%	±5%	±2%	±2%
Power - Max	500 mW	500 mW	500 mW	400 mW	400 mW
Impedance (Max)	25 Ohms	25 Ohms	25 Ohms	55 Ohms	55 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 15 V	100 nA @ 15 V	100 nA @ 15 V	50 nA @ 14 V	50 nA @ 14 V
Voltage - Forward (Max) @ If	1.1 V @ 200 mA	1.5 V @ 200 mA	1.2 V @ 200 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	175°C	-65°C ~ 175°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

1N5250B (Microchip Technology)

This part maintains electrical equivalence with 20 V nominal Zener voltage, 500 mW power rating, and identical impedance specification. The tolerance widens to ±5% compared to the main part's ±2%, and forward voltage increases to 1.5 V at 200 mA. Operating temperature range extends to -65°C minimum. RoHS non-compliance status differs from the main part. This substitute is suitable for applications where tighter tolerance is not required.

1N5250BTR (Fairchild Semiconductor)

This part provides full electrical equivalence with 20 V nominal Zener voltage, 500 mW power rating, and 25 Ohms impedance. Tolerance is ±5%, with forward voltage of 1.2 V at 200 mA. Operating temperature range extends to -65°C to 200°C, providing superior thermal performance. This substitute offers the closest electrical match to the main part while maintaining active product status.

BZX79-B20,113 and BZX79-B20,143 (NXP Semiconductors)

Both NXP parts maintain the 20 V nominal Zener voltage and ±2% tolerance matching the main part. Maximum power dissipation is reduced to 400 mW, representing a 20% decrease from the 500 mW specification. Impedance increases to 55 Ohms. Reverse leakage current is lower at 50 nA. Operating temperature range extends to -65°C to 200°C. These parts are suitable for applications where the 400 mW power rating is sufficient and lower impedance is not critical. The two NXP part numbers are functionally identical with different supplier packaging designations.

Frequently Asked Questions (FAQ)

Q: Can the 1N5250B substitute for the 1N5250C-TAP in all applications?

A: The 1N5250B maintains the same 20 V nominal Zener voltage, 500 mW power rating, and DO-35 package. The primary differences are ±5% tolerance versus ±2%, and forward voltage of 1.5 V versus 1.1 V at 200 mA. Substitution is valid for applications where these parameter variations are acceptable. RoHS compliance status differs.

Q: What is the impact of the reduced 400 mW power rating in the NXP BZX79-B20 series?

A: The BZX79-B20,113 and BZX79-B20,143 are rated for 400 mW maximum power dissipation compared to 500 mW for the main part. These parts are suitable for circuits where power dissipation does not exceed 400 mW. Applications requiring the full 500 mW capability must use the main part or the Microchip 1N5250B or Fairchild 1N5250BTR alternatives.

Q: Are all substitute parts available in the same DO-35 package?

A: All substitute parts are packaged in DO-204AH (DO-35) axial through-hole configuration, ensuring mechanical compatibility with the main part. Supplier device package designations may vary (ALF2 for NXP parts), but the physical package remains equivalent.

Q: How do tolerance differences affect circuit performance?

A: The main part specifies ±2% tolerance, while the Microchip 1N5250B and Fairchild 1N5250BTR specify ±5%. The NXP parts maintain ±2% tolerance. Tighter tolerance is beneficial in precision voltage regulation circuits. Applications with less stringent voltage regulation requirements can accommodate the wider ±5% tolerance.

Q: What is the significance of impedance variation between parts?

A: The main part and Microchip/Fairchild substitutes specify 25 Ohms maximum impedance, while NXP parts specify 55 Ohms. Lower impedance provides better high-frequency performance and faster transient response. Applications requiring superior dynamic characteristics should prioritize parts with 25 Ohms impedance.

Q: Can the 1N5250BTR be used in automotive applications?

A: The 1N5250BTR is manufactured by Fairchild Semiconductor and maintains active product status. The main part carries AEC-Q101 automotive qualification. Automotive application requirements should be verified against specific design standards and qualification documentation for the Fairchild part.

Q: Are the two NXP part numbers BZX79-B20,113 and BZX79-B20,143 interchangeable?

A: Yes, both NXP parts are functionally identical with the same electrical specifications. The different part numbers reflect different supplier packaging or distribution designations. Either part can be used as a direct substitute for the other.

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