BZX55F27-TAP Equivalent & Substitute Parts

Part Overview

The BZX55F27-TAP is a 27 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, though 691 pieces remain in stock as new original inventory. The part is AEC-Q101 qualified for automotive applications and complies with ROHS3 and REACH regulations.

Due to the obsolete product status of the BZX55F27-TAP, identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements. Substitute parts must maintain electrical compatibility across zener voltage, power dissipation, and thermal operating ranges while accommodating tolerance and impedance variations.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	27	V
Power - Maximum	500	mW
Tolerance	±1%	—
Impedance (Maximum)	80	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 20 V
Voltage - Forward (Maximum) @ If	1.5	V @ 200 mA
Operating Temperature	—	°C
Package / Case	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the BZX55F27-TAP is determined by the following critical parameters:

Primary Electrical Criteria:

Zener voltage: 27 V nominal
Power dissipation: 500 mW maximum
Package type: DO-35 (DO-204AH) through-hole axial configuration
Mounting: Through-hole technology

Secondary Compatibility Criteria:

Tolerance: ±1% to ±5% acceptable (tighter tolerance preferred for precision applications)
Impedance: 40 to 80 Ohms maximum
Reverse leakage current: 100 nA to 100 µA @ specified voltage
Forward voltage: 1.1 to 1.5 V @ 200 mA
Operating temperature range: Minimum -65°C to 175°C

Compliance & Status Criteria:

Product status: Active preferred; obsolete acceptable for legacy designs
RoHS compliance: ROHS3 compliant preferred
Automotive qualification: AEC-Q101 required for automotive applications

All substitute parts listed maintain the 27 V zener voltage and 500 mW power rating. Variations in tolerance, impedance, and forward voltage are within acceptable engineering margins for general zener diode applications. Reverse leakage current differences reflect manufacturing process variations between suppliers.

Parameter Comparison

Parameter	BZX55F27-TAP	BZX55B27-TAP	1N3528A	1N5254B TR PBFREE	1N6010B	1N6010C
Manufacturer	Vishay	Vishay	Microchip	Central Semiconductor	Microchip	Microchip
Voltage - Zener (Nom)	27 V	27 V	27 V	27 V	27 V	27 V
Tolerance	±1%	±2%	±5%	±5%	±5%	±2%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	80 Ω	80 Ω	40 Ω	41 Ω	70 Ω	70 Ω
Current - Reverse Leakage @ Vr	100 nA @ 20 V	100 nA @ 20 V	—	100 µA @ 21 V	100 nA @ 21 V	100 nA @ 21 V
Voltage - Forward (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature	—	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 200°C	-65°C ~ 175°C	-65°C ~ 175°C
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant
Grade	Automotive	Automotive	—	—	—	—
Qualification	AEC-Q101	AEC-Q101	—	—	—	—

Engineering Selection Recommendations

Primary Substitute: BZX55B27-TAP

The BZX55B27-TAP is the recommended direct substitute for the BZX55F27-TAP. Both parts are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications with the exception of tolerance (±2% versus ±1%). The BZX55B27-TAP is currently in active production status with 11,327 pieces in stock, ensuring supply continuity. Both parts maintain AEC-Q101 automotive qualification and ROHS3 compliance. The tolerance difference of ±1% is acceptable for most zener diode applications where the primary function is voltage regulation or overvoltage protection.

Secondary Substitutes: 1N6010C

The 1N6010C, manufactured by Microchip Technology, provides a ±2% tolerance specification matching the BZX55B27-TAP and maintaining the same 27 V, 500 mW electrical characteristics. This part is in active production with 686 pieces in stock. The impedance specification of 70 Ohms is within acceptable range. However, RoHS non-compliance status requires evaluation against design requirements. This part is suitable for applications where RoHS compliance is not mandated.

Tertiary Substitutes: 1N5254B TR PBFREE and 1N3528A

The 1N5254B TR PBFREE (Central Semiconductor Corp) and 1N3528A (Microchip Technology) both provide 27 V, 500 mW zener diodes with ±5% tolerance. The 1N5254B TR PBFREE offers extended operating temperature range (-65°C to 200°C) and ROHS3 compliance, making it suitable for high-temperature applications. The 1N3528A provides lower impedance (40 Ohms) but carries RoHS non-compliance status. Both parts are in active production with adequate inventory levels.

Quaternary Substitute: 1N6010B

The 1N6010B (Microchip Technology) maintains 27 V, 500 mW specifications with ±5% tolerance and 70 Ohms impedance. This part is in active production with 713 pieces in stock. RoHS non-compliance and lack of automotive qualification limit its application to non-regulated designs.

Selection Criteria Summary:

For automotive applications requiring AEC-Q101 qualification and ROHS3 compliance, select BZX55B27-TAP as the primary substitute.

For general industrial applications where RoHS compliance is required but automotive qualification is not mandatory, select 1N5254B TR PBFREE.

For applications requiring extended temperature operation beyond 175°C, select 1N5254B TR PBFREE (rated to 200°C).

For applications where impedance minimization is critical, select 1N3528A (40 Ohms impedance).

Frequently Asked Questions (FAQ)

Q: Can the BZX55B27-TAP directly replace the BZX55F27-TAP without circuit modification?

A: Yes. The BZX55B27-TAP is a direct substitute with identical zener voltage (27 V), power rating (500 mW), package (DO-35), and mounting type (through-hole). The tolerance difference (±2% versus ±1%) does not require circuit modification for standard voltage regulation applications.

Q: What is the significance of the tolerance difference between BZX55F27-TAP (±1%) and BZX55B27-TAP (±2%)?

A: Tolerance specifies the maximum deviation of the zener voltage from the nominal 27 V value. The BZX55F27-TAP maintains zener voltage between 26.73 V and 27.27 V, while the BZX55B27-TAP maintains it between 26.46 V and 27.54 V. For precision voltage reference applications, the ±1% tolerance is preferred. For general overvoltage protection and voltage regulation, the ±2% tolerance is acceptable.

Q: Are all substitute parts compatible with automotive applications?

A: No. Only BZX55F27-TAP and BZX55B27-TAP carry AEC-Q101 automotive qualification. The 1N3528A, 1N5254B TR PBFREE, 1N6010B, and 1N6010C do not have automotive qualification. For automotive applications, use BZX55B27-TAP as the substitute.

Q: What does RoHS compliance mean for zener diode selection?

A: ROHS3 compliance indicates the part does not contain restricted substances including lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers. For applications subject to RoHS regulations (primarily European markets), select ROHS3-compliant parts: BZX55F27-TAP, BZX55B27-TAP, or 1N5254B TR PBFREE.

Q: Can I use 1N5254B TR PBFREE in place of BZX55B27-TAP in a high-temperature environment?

A: Yes, if the application does not require automotive qualification. The 1N5254B TR PBFREE operates to 200°C compared to 175°C for BZX55B27-TAP. Both maintain 27 V, 500 mW specifications. Verify that the ±5% tolerance of the 1N5254B TR PBFREE is acceptable for your circuit design.

Q: What is the difference between impedance values of 40 Ohms, 70 Ohms, and 80 Ohms?

A: Impedance (Zzt) represents the dynamic resistance of the zener diode in the reverse-biased region. Lower impedance (40 Ohms) provides better voltage regulation with reduced output impedance, resulting in lower output voltage ripple. Higher impedance (80 Ohms) is acceptable for applications with less stringent regulation requirements. For precision voltage reference circuits, select parts with lower impedance values.

Q: Why do some substitute parts show different reverse leakage current specifications?

A: Reverse leakage current varies based on manufacturing process, semiconductor material purity, and junction design. The BZX55F27-TAP and BZX55B27-TAP specify 100 nA @ 20 V, while 1N5254B TR PBFREE specifies 100 µA @ 21 V (1000 times higher). Higher leakage current increases power dissipation in reverse bias conditions. For low-power applications, select parts with lower leakage current specifications.

Q: Is the DO-35 package identical across all substitute parts?

A: Yes. All substitute parts use the DO-204AH (DO-35) package, which is a standardized through-hole axial package with identical physical dimensions and lead spacing. All parts are directly interchangeable at the PCB level without layout modification.

Q: What inventory considerations should guide my substitute part selection?

A: BZX55B27-TAP has the highest inventory (11,327 pieces), ensuring long-term supply availability. 1N5254B TR PBFREE has 8,595 pieces in stock. 1N3528A and 1N6010B have lower inventory levels (1,063 and 713 pieces respectively). For production designs requiring sustained supply, prioritize parts with higher inventory levels.

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