Equivalent & Substitute Parts for BZX55F22-TAP

Part Overview

The BZX55F22-TAP is a 22 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in a through-hole DO-35 package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The BZX55F22-TAP meets automotive-grade specifications with AEC-Q101 qualification and ROHS3 compliance.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	22	V
Tolerance	±1%	—
Power - Maximum	500	mW
Impedance (Maximum)	55	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 16 V	—
Voltage - Forward (Maximum) @ If	1.5 V @ 200 mA	—
Operating Temperature	175	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BZX55F22-TAP is determined by the following critical parameters: nominal Zener voltage (22 V), maximum power dissipation (500 mW), through-hole mounting configuration, and DO-35 package compatibility. All substitute parts maintain these core electrical and mechanical specifications.

Substitute parts are grouped into two categories based on tolerance and impedance characteristics:

Category 1: Tighter Tolerance (±1% to ±2%) Parts with ±1% or ±2% voltage tolerance and 55 Ohm impedance provide direct functional equivalence to the BZX55F22-TAP. These include BZX55B22-TAP (±2%, active status) and 1N5744D (±1%, active status).

Category 2: Relaxed Tolerance (±5% to ±10%) Parts with ±5% or ±10% voltage tolerance and lower impedance (29 Ohms) offer functional substitution where tolerance requirements are less stringent. These include 1N5251B TR PBFREE, 1N5251BDO35, 1N5251BTR, 1N5744B, 1N6008A, and 1N6008C.

All substitute parts maintain the 22 V nominal Zener voltage, 500 mW power rating, through-hole mounting, and DO-35 package configuration. Differences in tolerance, impedance, and operating temperature ranges are documented in the parameter comparison table.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Operating Temp	Product Status	RoHS Status
BZX55F22-TAP	Vishay	22 V	±1%	500 mW	55 Ω	1.5 V @ 200 mA	175°C	Obsolete	ROHS3
BZX55B22-TAP	Vishay	22 V	±2%	500 mW	55 Ω	1.5 V @ 200 mA	-65°C ~ 175°C	Active	ROHS3
1N5744D	Microchip Technology	22 V	±1%	500 mW	55 Ω	900 mV @ 10 mA	-65°C ~ 175°C	Active	Non-compliant
1N5251B TR PBFREE	Central Semiconductor Corp	22 V	±5%	500 mW	29 Ω	1.1 V @ 200 mA	-65°C ~ 200°C	Active	ROHS3
1N5251BDO35	Microsemi Corporation	22 V	±5%	500 mW	29 Ω	1.5 V @ 200 mA	-65°C ~ 175°C	Active	ROHS3
1N5251BTR	Fairchild Semiconductor	22 V	±5%	500 mW	29 Ω	1.2 V @ 200 mA	-65°C ~ 200°C	Active	Not specified
1N5744B	Microchip Technology	22 V	±5%	500 mW	55 Ω	900 mV @ 10 mA	-65°C ~ 175°C	Active	Non-compliant
1N6008A	Microchip Technology	22 V	±10%	500 mW	70 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	Active	Non-compliant
1N6008C	Microchip Technology	22 V	±2%	500 mW	55 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	Active	Non-compliant

Engineering Selection Recommendations

Primary Recommendation: BZX55B22-TAP

The BZX55B22-TAP is the preferred direct substitute for the obsolete BZX55F22-TAP. Both parts are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications (22 V nominal, 500 mW, 55 Ohm impedance). The BZX55B22-TAP differs only in voltage tolerance (±2% versus ±1%) and includes an extended operating temperature range (-65°C to 175°C). The BZX55B22-TAP maintains ROHS3 compliance and active product status with 4,100 units in stock.

Secondary Recommendation: 1N5744D

The 1N5744D from Microchip Technology provides an alternative with matching ±1% tolerance and 55 Ohm impedance. This part is active and supports the full -65°C to 175°C operating temperature range. However, the 1N5744D is RoHS non-compliant, which may restrict use in applications requiring RoHS certification.

Tertiary Recommendations: 1N5251B Series (1N5251B TR PBFREE, 1N5251BDO35, 1N5251BTR)

The 1N5251B series parts offer functional substitution with relaxed ±5% voltage tolerance and lower impedance (29 Ohms). These parts are active and widely available. The 1N5251B TR PBFREE and 1N5251BDO35 maintain ROHS3 compliance. The 1N5251B TR PBFREE supports an extended operating temperature range (-65°C to 200°C). Selection from this series is appropriate for applications where tighter voltage tolerance is not critical.

Compliance Considerations

For applications requiring RoHS compliance, select from: BZX55B22-TAP, 1N5251B TR PBFREE, or 1N5251BDO35. For applications requiring automotive-grade qualification (AEC-Q101), only BZX55B22-TAP maintains this specification among active parts.

Frequently Asked Questions (FAQ)

Q: Can the BZX55F22-TAP be directly replaced with BZX55B22-TAP?

A: Yes. Both parts are manufactured by Vishay and share identical nominal Zener voltage (22 V), power rating (500 mW), impedance (55 Ohms), and package configuration (DO-35). The BZX55B22-TAP has relaxed tolerance (±2% versus ±1%) and extended operating temperature range, making it a direct functional substitute.

Q: What is the difference between the 1N5251B series and the BZX55B22-TAP?

A: The 1N5251B series parts have lower impedance (29 Ohms versus 55 Ohms) and relaxed voltage tolerance (±5% versus ±2%). These differences affect circuit performance in applications sensitive to dynamic impedance or requiring tight voltage regulation. The 1N5251B series is suitable for general-purpose applications where these relaxed specifications are acceptable.

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

A: Yes. All substitute parts listed are available in the DO-35 package (DO-204AH designation). This ensures mechanical and electrical compatibility with existing through-hole PCB designs.

Q: Which substitute part has the best RoHS compliance status?

A: BZX55B22-TAP, 1N5251B TR PBFREE, and 1N5251BDO35 are all ROHS3 compliant. The 1N5744D, 1N5744B, 1N6008A, and 1N6008C are RoHS non-compliant.

Q: What is the impact of impedance differences on circuit performance?

A: Impedance (Zzt) affects the dynamic resistance of the Zener diode at specified test currents. Lower impedance (29 Ohms in 1N5251B series) provides better voltage regulation under varying load conditions. Higher impedance (55 Ohms in BZX55B22-TAP and 1N5744D) results in greater voltage variation with load changes. Selection depends on circuit requirements for voltage stability.

Q: Can the 1N6008A or 1N6008C be used in automotive applications?

A: The 1N6008A and 1N6008C are not qualified to AEC-Q101 automotive standards and are RoHS non-compliant. These parts are not suitable for automotive applications requiring these certifications. Use BZX55B22-TAP for automotive-grade requirements.

Q: What is the significance of the ±10% tolerance in the 1N6008A?

A: The ±10% tolerance in the 1N6008A results in a Zener voltage range of 19.8 V to 24.2 V. This wide tolerance is suitable only for applications where voltage regulation is not critical. For applications requiring tighter voltage control, select parts with ±1%, ±2%, or ±5% tolerance.

Q: Are there temperature range considerations when selecting a substitute?

A: Yes. The BZX55F22-TAP is rated to 175°C maximum. The 1N5251B TR PBFREE extends to 200°C, while most other substitutes are rated to 175°C. For high-temperature applications, the 1N5251B TR PBFREE offers extended thermal capability.

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