BZX55F27-TR Equivalent & Substitute Parts

Part Overview

The BZX55F27-TR 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 719 units remain in stock. The part carries AEC-Q101 automotive qualification and ROHS3 compliance.

Due to the obsolete product status of the BZX55F27-TR, 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 voltage regulation, power dissipation, and thermal operating ranges while accommodating variations in tolerance and impedance specifications.

Key Parameters

Parameter	BZX55F27-TR
Voltage - Zener (Nom)	27 V
Tolerance	±1%
Power - Max	500 mW
Impedance (Max)	80 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 20 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 BZX55F27-TR is determined by the following critical parameters:

Primary Electrical Criteria:

Zener voltage: 27 V nominal
Power dissipation: 500 mW maximum
Package type: DO-35 through-hole axial configuration
Operating temperature range compatibility

Secondary Electrical Criteria:

Zener voltage tolerance (±1%, ±2%, or ±5%)
Impedance (Zzt) maximum values
Forward voltage characteristics
Reverse leakage current specifications

Compliance & Qualification:

RoHS compliance status
AEC-Q101 automotive qualification
Product status (active vs. obsolete)

Substitute parts are grouped into two categories based on tolerance specifications and compliance requirements. Parts with ±1% or ±2% tolerance provide closer voltage regulation performance. Parts with ±5% tolerance offer broader substitution capability with relaxed precision requirements. All substitute parts maintain the 27 V nominal voltage and 500 mW power rating, ensuring functional equivalence in voltage regulation applications.

Parameter Comparison

Parameter	BZX55F27-TR	BZX55B27-TR	1N3528A	1N5254B BK PBFREE	1N5254B TR PBFREE	1N6010B	1N6010C
Manufacturer	Vishay	Vishay	Microchip	Central Semiconductor	Central Semiconductor	Microchip	Microchip
Voltage - Zener (Nom)	27 V	27 V	27 V	27 V	27 V	27 V	27 V
Tolerance	±1%	±2%	±5%	±5%	±5%	±5%	±2%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	80 Ohms	80 Ohms	40 Ohms	41 Ohms	41 Ohms	70 Ohms	70 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 20 V	100 nA @ 20 V	Not specified	100 nA @ 21 V	100 µA @ 21 V	100 nA @ 21 V	100 nA @ 21 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	1.1 V @ 200 mA	1.1 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	-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	DO-204AH, DO-35, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitute: BZX55B27-TR

The BZX55B27-TR is the recommended direct substitute for the BZX55F27-TR. Both parts are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications with the exception of tolerance (±2% versus ±1%) and operating temperature range. The BZX55B27-TR carries active product status, ROHS3 compliance, and AEC-Q101 automotive qualification. With 30,874 units in stock, supply continuity is assured. The ±2% tolerance remains suitable for voltage regulation applications where the original ±1% specification is not critical.

Secondary Substitutes: 1N5254B TR PBFREE and 1N6010C

The 1N5254B TR PBFREE (Central Semiconductor Corp) and 1N6010C (Microchip Technology) are active alternatives with ±5% tolerance specifications. Both maintain 27 V nominal voltage and 500 mW power dissipation. The 1N5254B TR PBFREE offers extended operating temperature range (-65°C to 200°C) and ROHS3 compliance with 8,595 units available. The 1N6010C provides ±2% tolerance with 686 units in stock but carries RoHS non-compliance status. Selection between these parts depends on tolerance requirements and compliance mandates.

Tertiary Substitutes: 1N3528A and 1N6010B

The 1N3528A (Microchip Technology) and 1N6010B (Microchip Technology) are functional alternatives with ±5% tolerance and active product status. Both support the full -65°C to 175°C operating range. However, both parts carry RoHS non-compliance status, limiting their use in applications with strict environmental compliance requirements. These parts are suitable for legacy designs or applications where RoHS compliance is not mandated.

Compliance Considerations

For applications requiring ROHS3 compliance and automotive qualification, selection is limited to BZX55B27-TR, 1N5254B BK PBFREE, and 1N5254B TR PBFREE. The BZX55B27-TR remains the optimal choice due to manufacturer continuity and established supply chain relationships. For applications without RoHS compliance requirements, all substitute parts are electrically compatible.

Frequently Asked Questions (FAQ)

Q: Can the BZX55B27-TR directly replace the BZX55F27-TR?

A: Yes. The BZX55B27-TR is a direct substitute manufactured by the same supplier (Vishay). Both parts share identical voltage (27 V), power (500 mW), impedance (80 Ohms), and package specifications. The tolerance difference (±2% versus ±1%) and expanded operating temperature range (-65°C to 175°C versus 175°C maximum) make the BZX55B27-TR suitable for the same applications. The BZX55B27-TR carries active product status with significantly higher inventory availability.

Q: What is the difference between ±1%, ±2%, and ±5% tolerance specifications?

A: Tolerance specifies the allowable deviation of the actual Zener voltage from the nominal 27 V specification. A ±1% tolerance (BZX55F27-TR) allows deviation between 26.73 V and 27.27 V. A ±2% tolerance (BZX55B27-TR, 1N6010C) allows deviation between 26.46 V and 27.54 V. A ±5% tolerance (1N3528A, 1N5254B, 1N6010B) allows deviation between 25.65 V and 28.35 V. Applications requiring precise voltage regulation benefit from tighter tolerances. Applications with broader voltage acceptance ranges accommodate wider tolerances.

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

A: Yes. All substitute parts listed are available in the DO-35 through-hole axial package configuration. Package compatibility ensures mechanical and electrical interchangeability on printed circuit boards without layout modifications.

Q: Which substitute parts maintain AEC-Q101 automotive qualification?

A: The BZX55B27-TR carries explicit AEC-Q101 automotive qualification. The substitute parts from Central Semiconductor Corp (1N5254B series) and Microchip Technology (1N3528A, 1N6010B, 1N6010C) do not list AEC-Q101 qualification in the provided specifications. For automotive applications requiring AEC-Q101 certification, the BZX55B27-TR is the appropriate selection.

Q: What is the significance of RoHS compliance status?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The BZX55B27-TR and 1N5254B series are ROHS3 compliant. The 1N3528A, 1N6010B, and 1N6010C are RoHS non-compliant. Applications subject to environmental regulations or customer requirements mandate ROHS3 compliance. Legacy designs or applications without such mandates can utilize non-compliant parts.

Q: How do impedance differences affect circuit performance?

A: Impedance (Zzt) represents the dynamic resistance of the Zener diode at the specified test current. The BZX55F27-TR and BZX55B27-TR specify 80 Ohms maximum impedance. The 1N3528A specifies 40 Ohms, while 1N5254B series and 1N6010 series specify 41 and 70 Ohms respectively. Lower impedance values provide better voltage regulation stability and reduced output impedance in voltage regulation circuits. Higher impedance values result in slightly greater voltage ripple. Selection depends on circuit ripple and regulation requirements.

Q: What is the difference between bulk and cut tape packaging?

A: Bulk packaging indicates loose components supplied in bulk quantities. Cut tape (CT) packaging indicates components supplied on continuous tape suitable for automated pick-and-place assembly equipment. The BZX55B27-TR is available in cut tape format with 30,874 units in stock. The 1N5254B TR PBFREE is available in cut tape format with 8,595 units. Bulk-packaged parts require manual handling and are typically used for lower-volume applications or repair work.

Q: Can 1N5254B BK PBFREE and 1N5254B TR PBFREE be used interchangeably?

A: Both parts are electrically identical 27 V, 500 mW Zener diodes manufactured by Central Semiconductor Corp with ±5% tolerance. The primary difference is packaging format: BK PBFREE is supplied in bulk, while TR PBFREE is supplied on cut tape. Electrical performance and compatibility are identical. Selection depends on assembly process requirements and inventory management preferences.

Q: What operating temperature range should be selected for my application?

A: The BZX55F27-TR specifies a maximum operating temperature of 175°C. The BZX55B27-TR, 1N3528A, 1N6010B, and 1N6010C support -65°C to 175°C operating range. The 1N5254B series supports -65°C to 200°C operating range. Selection depends on the minimum ambient temperature and maximum junction temperature requirements of the application. Extended temperature range parts provide greater design margin for high-temperature environments.

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