BZX55A24-TAP Equivalent & Substitute Parts

Part Overview

The BZX55A24-TAP is a 24 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in a DO-35 through-hole package. This component is classified as obsolete, though 1017 pieces remain in stock. The part is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH regulations.

Due to the obsolete product status of the BZX55A24-TAP, equivalent substitute parts are necessary for new designs, production continuity, and long-term component availability. Active alternatives with identical or compatible electrical and mechanical specifications are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	24	V
Power - Maximum	500	mW
Tolerance	±1%	—
Impedance (Maximum)	80	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 18 V
Voltage - Forward (Maximum) @ 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	—

Substitute Part Grouping Explanation

Substitution of the BZX55A24-TAP is determined by the following critical parameters:

Electrical Compatibility Requirements:

Zener voltage: 24 V nominal
Power dissipation: 500 mW maximum
Reverse leakage current: 100 nA @ 18 V
Package: DO-35 (DO-204AH) through-hole axial configuration

Tolerance Considerations: The BZX55A24-TAP specifies ±1% tolerance. Substitute parts with ±2% or ±5% tolerance remain functionally compatible in most applications, though tighter tolerance specifications (±1%) provide superior voltage regulation accuracy.

Impedance Variation: Impedance values range from 33 Ohms to 80 Ohms across available substitutes. Lower impedance values (33 Ohms) indicate superior high-frequency performance and faster transient response.

Temperature Operating Range: The BZX55A24-TAP operates to 175°C maximum. Substitutes with extended temperature ranges (-65°C to 200°C) provide additional thermal margin and design flexibility.

Compliance and Certification: All substitute parts maintain automotive-grade qualification (AEC-Q101) and ROHS3 compliance. RoHS non-compliant alternatives are listed for reference but require compliance verification for new designs.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vf @ 200mA (V)	Temp Range (°C)	RoHS Status	Product Status
BZX55A24-TAP	Vishay	24	±1%	500	80	1.5	to 175	ROHS3	Obsolete
BZX55B24-TAP	Vishay	24	±2%	500	80	1.5	-65 to 175	ROHS3	Active
1N5252B	Microchip	24	±5%	500	33	1.5	-65 to 175	Non-compliant	Active
1N5252B TR PBFREE	Central Semiconductor	24	±5%	500	33	1.1	-65 to 200	ROHS3	Active
1N5252BTR	onsemi	24	±5%	500	33	1.2	-65 to 200	ROHS3	Active
1N5745B	Microchip	24	±5%	500	70	0.9 @ 10mA	-65 to 175	Non-compliant	Active
1N5745D	Microchip	24	±1%	500	70	0.9 @ 10mA	-65 to 175	Non-compliant	Active
1N6009D	Microchip	24	±1%	500	62	1.1	-65 to 175	Non-compliant	Active

Engineering Selection Recommendations

Primary Recommendation: BZX55B24-TAP

The BZX55B24-TAP is the direct successor to the BZX55A24-TAP. Both parts are manufactured by Vishay and share identical electrical specifications except for tolerance (±2% versus ±1%). The BZX55B24-TAP maintains ROHS3 compliance, AEC-Q101 automotive qualification, and active product status with 30,733 units in stock. This part provides the highest compatibility and supply continuity for direct replacement applications.

Secondary Recommendation: 1N5252B TR PBFREE

The 1N5252B TR PBFREE, manufactured by Central Semiconductor Corp, offers ROHS3 compliance and an extended operating temperature range (-65°C to 200°C). Although tolerance is ±5%, this part maintains the required 24 V nominal voltage and 500 mW power rating. The lower forward voltage (1.1 V @ 200 mA) and reduced impedance (33 Ohms) provide improved transient response characteristics. This part is suitable for applications requiring enhanced thermal performance and lead-free compliance.

Alternative Recommendation: 1N5252BTR

The 1N5252BTR from onsemi provides ROHS3 compliance, extended temperature range (-65°C to 200°C), and active product status. With 4,835 units in stock, this part offers reliable availability. The ±5% tolerance and 33 Ohm impedance are consistent with other 1N5252 variants.

Precision Applications: 1N5745D or 1N6009D

For applications requiring ±1% tolerance matching the original BZX55A24-TAP specification, the 1N5745D and 1N6009D are available from Microchip Technology. Both parts maintain the 24 V nominal voltage and 500 mW power rating with ±1% tolerance. The 1N6009D provides slightly lower impedance (62 Ohms versus 70 Ohms) and forward voltage characteristics closer to the original part. Note that these alternatives carry RoHS non-compliant status and require compliance verification for new designs.

Compliance Considerations:

For new designs subject to ROHS3 and automotive qualification requirements, BZX55B24-TAP, 1N5252B TR PBFREE, or 1N5252BTR are the appropriate selections. For legacy or non-regulated applications, 1N5745D and 1N6009D provide precision tolerance matching with active product status.

Frequently Asked Questions (FAQ)

Q: Can the BZX55A24-TAP be directly replaced with the BZX55B24-TAP?

A: Yes. Both parts are manufactured by Vishay, share identical mechanical packaging (DO-35), and maintain the same 24 V nominal voltage and 500 mW power rating. The tolerance difference (±1% versus ±2%) is the only electrical distinction. The BZX55B24-TAP is the active production equivalent.

Q: What is the difference between 1N5252B variants from different manufacturers?

A: All 1N5252B variants maintain 24 V nominal voltage and 500 mW power rating with ±5% tolerance. Differences exist in forward voltage characteristics, impedance, and temperature operating ranges. The 1N5252B TR PBFREE (Central Semiconductor) operates to 200°C and includes ROHS3 compliance. The 1N5252BTR (onsemi) also extends to 200°C with ROHS3 compliance. The standard 1N5252B (Microchip) is RoHS non-compliant.

Q: Does impedance variation affect circuit performance?

A: Impedance affects transient response and high-frequency performance. Lower impedance values (33 Ohms in 1N5252 variants) provide faster response to load transients compared to higher impedance values (70-80 Ohms in BZX55 and 1N5745 variants). For precision voltage regulation applications, impedance selection should align with circuit bandwidth requirements.

Q: Are all substitute parts automotive-qualified?

A: The BZX55B24-TAP maintains AEC-Q101 automotive qualification. The 1N5252B variants and 1N5745/1N6009 series do not explicitly list AEC-Q101 qualification in the provided specifications. Verification with manufacturers is required for automotive applications.

Q: What is the significance of ±1% versus ±5% tolerance?

A: The BZX55A24-TAP and 1N5745D/1N6009D specify ±1% tolerance, ensuring the zener voltage remains within 23.76 V to 24.24 V. Parts with ±5% tolerance (1N5252 variants) allow voltage variation from 22.8 V to 25.2 V. Applications requiring precise voltage regulation benefit from ±1% tolerance specifications.

Q: Can these parts be used in applications exceeding 175°C?

A: The BZX55A24-TAP, BZX55B24-TAP, 1N5745B, 1N5745D, and 1N6009D are rated to 175°C maximum. The 1N5252B TR PBFREE and 1N5252BTR extend to 200°C. For applications requiring operation above 175°C, only the 1N5252B TR PBFREE or 1N5252BTR are suitable.

Q: Is RoHS compliance required for my application?

A: ROHS3 compliance is mandatory for products sold in the European Union and many other regulated markets. The BZX55B24-TAP, 1N5252B TR PBFREE, and 1N5252BTR are ROHS3 compliant. The 1N5252B (Microchip), 1N5745B, 1N5745D, and 1N6009D are RoHS non-compliant and require compliance verification before use in regulated applications.

Q: What packaging options are available?

A: All substitute parts are supplied in DO-35 (DO-204AH) through-hole axial packages, matching the original BZX55A24-TAP mechanical specification. Packaging variations include bulk and cut tape (CT) formats, which affect handling and assembly processes but not electrical performance.

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