Equivalent & Substitute Parts for ZPY27-TAP Zener Diode

Part Overview

The ZPY27-TAP is a 27 V, 1.3 W Zener diode manufactured by Vishay General Semiconductor - Diodes Division, packaged in DO-204AL (DO-41) axial through-hole configuration. This component is classified as Active product status with AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are identified to address inventory availability, supply chain continuity, or specific application requirements while maintaining electrical and mechanical compatibility within the 27 V Zener voltage class.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	27	V
Tolerance	±5%	%
Power - Max	1.3	W
Impedance (Max)	9	Ohms
Current - Reverse Leakage @ Vr	500	nA @ 20 V
Operating Temperature	175	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AL, DO-41, Axial	-
Grade	Automotive	-
Qualification	AEC-Q101	-

Substitute Part Grouping Explanation

Substitution eligibility for the ZPY27-TAP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): Must equal 27 V
Tolerance: Must equal ±5%
Mounting Type: Must be Through Hole
Package / Case: Must be compatible with DO-204AL, DO-41, or Axial configurations

Secondary Compatibility Factors:

Power - Max: Substitute parts may have equal or greater power rating
Impedance (Max): Lower impedance values indicate improved performance characteristics
Current - Reverse Leakage @ Vr: Lower leakage current indicates superior reverse bias performance
Operating Temperature Range: Substitute parts must support the application's thermal requirements

All substitute parts listed maintain the 27 V nominal Zener voltage and ±5% tolerance specification. Variations in power dissipation capability, impedance, and leakage current are permissible provided the substitute part meets or exceeds the performance envelope required by the application circuit.

Parameter Comparison

Parameter	ZPY27-TAP (Vishay)	1N4750A (Lumimax)	1N4750A-T50A (onsemi)	1N4750ATR (Fairchild)	1N5935BRLG (onsemi)
Voltage - Zener (Nom)	27 V	27 V	27 V	27 V	27 V
Tolerance	±5%	±5%	±5%	±5%	±5%
Power - Max	1.3 W	1 W	1 W	1 W	3 W
Impedance (Max)	9 Ohms	35 Ohms	35 Ohms	35 Ohms	23 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 20 V	5 µA @ 20.6 V	5 µA @ 20.6 V	5 µA @ 20.6 V	1 µA @ 20.6 V
Operating Temperature	175°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	Not Specified	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Direct Substitutes (1 W Power Rating):

The 1N4750A (Lumimax), 1N4750A-T50A (onsemi), and 1N4750ATR (Fairchild) are functionally equivalent substitutes for applications where the ZPY27-TAP power dissipation requirement does not exceed 1 W. These parts maintain identical Zener voltage (27 V) and tolerance (±5%) specifications. All three substitute parts are Active product status with REACH Unaffected compliance. The 1N4750A-T50A and 1N4750ATR offer ROHS3 compliance matching the original part. Operating temperature range extends to -65°C ~ 200°C, providing broader thermal coverage than the ZPY27-TAP specification of 175°C maximum.

Higher Power Substitute (3 W Power Rating):

The 1N5935BRLG (onsemi) is a 3 W rated substitute suitable for applications requiring increased power dissipation capability while maintaining the 27 V Zener voltage and ±5% tolerance. This part is Active product status with ROHS3 compliance and REACH Unaffected status. The 1N5935BRLG exhibits lower reverse leakage current (1 µA @ 20.6 V) compared to the 1 W alternatives, indicating superior reverse bias performance. Impedance of 23 Ohms is intermediate between the original part and the 1 W substitutes.

Compliance Considerations:

All substitute parts maintain REACH Unaffected status. The 1N4750A-T50A, 1N4750ATR, and 1N5935BRLG are ROHS3 compliant, matching the original ZPY27-TAP specification. The 1N4750A (Lumimax) carries RoHS compliance without specific ROHS3 designation. For automotive applications requiring AEC-Q101 qualification, the original ZPY27-TAP maintains this certification; substitute parts do not list AEC-Q101 qualification in the provided specifications.

Frequently Asked Questions (FAQ)

Q: Can the 1N4750A series (1 W) directly replace the ZPY27-TAP (1.3 W) in all applications?

A: The 1N4750A series is suitable for applications where actual power dissipation does not exceed 1 W. If the circuit design requires the full 1.3 W dissipation capability of the ZPY27-TAP, the 1N4750A series is not appropriate. The 1N5935BRLG (3 W) provides adequate power margin for such applications.

Q: What is the significance of the impedance difference between the ZPY27-TAP (9 Ohms) and substitute parts?

A: The ZPY27-TAP exhibits lower impedance (9 Ohms maximum) compared to the 1 W substitutes (35 Ohms maximum). Lower impedance indicates better voltage regulation characteristics and faster transient response. Applications sensitive to voltage regulation performance may require the original part or the 1N5935BRLG (23 Ohms), which provides intermediate impedance performance.

Q: Are all substitute parts suitable for automotive applications?

A: The ZPY27-TAP carries AEC-Q101 automotive qualification. The substitute parts listed do not include AEC-Q101 qualification in their specifications. For automotive applications requiring AEC-Q101 certification, the original ZPY27-TAP is the specified component. Substitute parts may be acceptable for non-automotive or non-qualified applications.

Q: What is the difference in reverse leakage current between parts?

A: The ZPY27-TAP specifies 500 nA reverse leakage at 20 V. The 1N4750A series specifies 5 µA at 20.6 V (10 times higher). The 1N5935BRLG specifies 1 µA at 20.6 V (2 times higher than 1N4750A series). Lower leakage current indicates superior reverse bias performance and lower standby current consumption in the circuit.

Q: Are the package configurations identical across all parts?

A: All parts are packaged in DO-204AL, DO-41, or Axial through-hole configurations. Physical dimensions and lead spacing are compatible. The supplier device package designations vary (DO-41G, DO-41, Axial), but all are mechanically compatible with standard through-hole PCB layouts designed for DO-41 axial components.

Q: What is the operating temperature range difference?

A: The ZPY27-TAP specifies a maximum operating temperature of 175°C. All substitute parts specify -65°C ~ 200°C operating range, providing 25°C additional high-temperature capability. For applications operating near the ZPY27-TAP thermal limit, substitute parts offer improved thermal margin.

Q: Which substitute part offers the best overall performance match?

A: The 1N5935BRLG provides the most comprehensive performance envelope with 3 W power rating, 23 Ohms impedance, and 1 µA reverse leakage current. However, selection depends on specific application requirements. For 1 W applications, the 1N4750A-T50A (onsemi) or 1N4750ATR (Fairchild) provide ROHS3 compliance matching the original part.

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