BZX55F24-TAP Equivalent & Substitute Parts

Part Overview

The BZX55F24-TAP is a 24 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 parts for ongoing design requirements and production continuity. The part carries automotive-grade qualification (AEC-Q101) and ROHS3 compliance. Substitute parts must maintain the 24 V nominal Zener voltage and 500 mW power rating while accommodating tolerance and impedance variations within acceptable engineering limits.

Key Parameters

Parameter	BZX55F24-TAP	Unit
Voltage - Zener (Nom)	24	V
Tolerance	±1%	-
Power - Max	500	mW
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 18 V	-
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	-
Operating Temperature	175	°C
Package / Case	DO-204AH, DO-35, Axial	-
Mounting Type	Through Hole	-
Grade	Automotive	-
Qualification	AEC-Q101	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the BZX55F24-TAP is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 24 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)

Secondary Compatibility Parameters:

Tolerance: ±1% to ±10% (wider tolerances acceptable in applications not requiring ±1% precision)
Impedance (Max): 33 to 80 Ohms (variation acceptable based on circuit requirements)
Voltage - Forward (Vf) (Max) @ If: 1.1 V to 1.5 V @ 200 mA (acceptable range for forward conduction)
Operating Temperature: -65°C to 200°C (minimum -65°C to 175°C acceptable)
RoHS Status: ROHS3 Compliant preferred; RoHS non-compliant parts acceptable for non-restricted applications

All substitute parts listed maintain the 24 V nominal Zener voltage and 500 mW power dissipation rating in DO-35 through-hole packages, ensuring mechanical and electrical compatibility with the original BZX55F24-TAP.

Parameter Comparison

Parameter	BZX55F24-TAP	BZX55B24-TAP	1N3527A	1N5252B TR PBFREE	1N5252BTR	1N6009A
Manufacturer	Vishay	Vishay	Microchip	Central Semiconductor	onsemi	Microchip
Voltage - Zener (Nom)	24 V	24 V	24 V	24 V	24 V	24 V
Tolerance	±1%	±2%	±5%	±5%	±5%	±10%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	80 Ohms	80 Ohms	38 Ohms	33 Ohms	33 Ohms	78 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 18 V	100 nA @ 18 V	Not specified	100 nA @ 18 V	100 nA @ 18 V	100 nA @ 15 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.2 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature	175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 175°C
Mounting Type	Through Hole	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	DO-204AH, DO-35
Grade	Automotive	Automotive	Not specified	Not specified	Not specified	Not specified
Qualification	AEC-Q101	AEC-Q101	Not specified	Not specified	Not specified	Not specified
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

Primary Substitute: BZX55B24-TAP

The BZX55B24-TAP is the recommended direct replacement for the obsolete BZX55F24-TAP. Both parts are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications with the exception of tolerance (±2% versus ±1%) and expanded operating temperature range (-65°C to 175°C). The BZX55B24-TAP maintains automotive-grade qualification (AEC-Q101) and ROHS3 compliance. This part is currently in active production status with substantial inventory availability (30,733 pcs), ensuring supply continuity.

Secondary Substitutes: 1N5252B TR PBFREE and 1N5252BTR

The 1N5252B TR PBFREE (Central Semiconductor Corp) and 1N5252BTR (onsemi) are functionally equivalent alternatives with ±5% tolerance specifications. Both parts are ROHS3 compliant and currently active. The 1N5252B TR PBFREE offers extended operating temperature range to 200°C and lower impedance (33 Ohms). The 1N5252BTR provides identical electrical performance with equivalent impedance characteristics. These parts are suitable for applications where ±5% tolerance is acceptable.

Tertiary Substitutes: 1N3527A and 1N6009A

The 1N3527A (Microchip Technology) and 1N6009A (Microchip Technology) are alternative sources for 24 V, 500 mW Zener diodes. The 1N3527A features ±5% tolerance with 38 Ohms impedance. The 1N6009A provides ±10% tolerance with 78 Ohms impedance, closely matching the original BZX55F24-TAP impedance characteristic. Both parts are currently active but carry RoHS non-compliant status, limiting use to applications without RoHS restrictions.

Compliance Considerations:

For applications requiring maintained automotive qualification and RoHS3 compliance, BZX55B24-TAP is the sole recommended substitute. For general-purpose applications accepting ±5% tolerance and ROHS3 compliance, 1N5252B TR PBFREE or 1N5252BTR are appropriate selections. Applications without RoHS restrictions may utilize 1N3527A or 1N6009A as cost-effective alternatives.

Frequently Asked Questions (FAQ)

Q: Can the BZX55B24-TAP directly replace the BZX55F24-TAP in all applications?

A: Yes. The BZX55B24-TAP is electrically and mechanically compatible with the BZX55F24-TAP. The tolerance difference (±2% versus ±1%) is the only specification variance. Applications requiring ±1% precision must evaluate circuit tolerance stack-up to determine acceptability of ±2% tolerance.

Q: What is the primary difference between the BZX55B24-TAP and the 1N5252B TR PBFREE?

A: Both parts maintain 24 V nominal Zener voltage and 500 mW power rating in DO-35 packages. The BZX55B24-TAP carries automotive qualification (AEC-Q101) with ±2% tolerance, while the 1N5252B TR PBFREE offers ±5% tolerance and extended operating temperature to 200°C. Impedance differs (80 Ohms versus 33 Ohms), affecting circuit response characteristics.

Q: Are the 1N3527A and 1N6009A suitable for automotive applications?

A: The 1N3527A and 1N6009A do not carry automotive qualification or AEC-Q101 certification. These parts are not recommended for automotive applications requiring compliance with automotive standards. Both parts are RoHS non-compliant, further restricting automotive use.

Q: How does impedance variation affect circuit performance?

A: Impedance (Zzt) affects the dynamic resistance of the Zener diode during transient conditions. The BZX55F24-TAP and BZX55B24-TAP specify 80 Ohms maximum impedance, while 1N5252B TR PBFREE and 1N5252BTR specify 33 Ohms. Lower impedance provides faster transient response. Circuit design must account for impedance differences when precise voltage regulation or noise filtering is required.

Q: What packaging options are available for these substitute parts?

A: All listed substitute parts are available in DO-35 through-hole axial packages (DO-204AH designation). The BZX55B24-TAP is supplied in cut tape (CT) packaging. The 1N3527A and 1N6009A are supplied in bulk packaging. Packaging format does not affect electrical performance but influences procurement and assembly processes.

Q: Is the 1N6009A with ±10% tolerance acceptable as a substitute?

A: The 1N6009A is electrically compatible with the BZX55F24-TAP and maintains identical impedance (78 Ohms). However, ±10% tolerance represents significant deviation from the original ±1% specification. Applications with loose voltage regulation requirements or wide circuit tolerance margins may accept this part. Precision voltage reference applications must reject this option.

Q: What is the significance of RoHS compliance status in substitute selection?

A: ROHS3 compliance is mandatory for products sold into European Union markets and many other regulated regions. The BZX55F24-TAP, BZX55B24-TAP, 1N5252B TR PBFREE, and 1N5252BTR are ROHS3 compliant. The 1N3527A and 1N6009A are RoHS non-compliant and cannot be used in applications subject to RoHS restrictions.

Q: Can forward voltage (Vf) differences impact circuit design?

A: Forward voltage differences (1.1 V to 1.5 V @ 200 mA) are relevant only when the Zener diode operates in forward conduction mode. In typical Zener regulation applications, the diode operates in reverse bias (Zener mode), where forward voltage is not a design factor. Forward voltage becomes significant in applications using the diode as a rectifier or in bidirectional protection circuits.

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