1N4755A-TAP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4755A-TAP is an active-status Zener diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 43 V nominal Zener voltage with 1.3 W maximum power dissipation. The device is packaged in DO-204AL (DO-41) axial through-hole configuration and meets AEC-Q101 automotive qualification standards. This component is used in voltage regulation and protection circuits where stable reference voltage and transient suppression are required. Substitute parts may be necessary due to inventory availability, supply chain considerations, or specific application requirements within the defined electrical and mechanical parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	43	V
Tolerance	±5%	-
Power - Max	1.3	W
Impedance (Max)	70	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 32.7 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature	175	°C (TJ)
Mounting Type	Through Hole	-
Package / Case	DO-204AL, DO-41, Axial	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the 1N4755A-TAP is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Zener (Nom): 43 V
Tolerance: ±5%
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or compatible axial configuration

Allowable Variation Parameters:

Power - Max: Substitute parts must equal or exceed 1.3 W
Impedance (Max): Substitute parts must not exceed 70 Ohms (lower impedance is acceptable)
Current - Reverse Leakage @ Vr: Substitute parts must not exceed 5 µA @ 32.7 V
Voltage - Forward (Vf) (Max) @ If: Substitute parts must not exceed 1.2 V @ 200 mA
Operating Temperature: Substitute parts must support minimum 175°C junction temperature

Substitute parts are grouped based on their ability to meet or exceed these parameters while maintaining the 43 V Zener voltage specification and through-hole axial package format.

Parameter Comparison

Parameter	1N4755A-TAP (Vishay)	1N4755A (Lumimax)	1N4755A-T50A (Fairchild)	BZV85-C43,113 (NXP)	BZX79-C43,133 (Nexperia)
Manufacturer	Vishay General Semiconductor	Lumimax Optoelectronic Technology	Fairchild Semiconductor	NXP USA Inc.	Nexperia USA Inc.
Voltage - Zener (Nom)	43 V	43 V	43 V	43 V	43 V
Tolerance	±5%	±5%	±5%	±5%	±5%
Power - Max	1.3 W	1 W	1 W	1.3 W	400 mW
Impedance (Max)	70 Ohms	70 Ohms	70 Ohms	75 Ohms	150 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 32.7 V	5 µA @ 32.7 V	Not specified	50 nA @ 30 V	55 µA @ 700 mV
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	1.2 V @ 200 mA	Not specified	1 V @ 50 mA	900 mV @ 10 mA
Operating Temperature	175°C (TJ)	-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-204AH, DO-35, Axial
RoHS Status	ROHS3 Compliant	RoHS Compliant	Not specified	Not specified	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Substitutes (Full Compatibility):

1N4755A (Lumimax) and 1N4755A-T50A (Fairchild) are direct substitutes for the 1N4755A-TAP. Both devices maintain identical Zener voltage (43 V), tolerance (±5%), impedance (70 Ohms), and forward voltage characteristics. Both are active-status products with through-hole axial packaging. The 1N4755A-T50A from Fairchild offers higher inventory availability (33,728 pcs) compared to the Lumimax alternative (4,280 pcs). Both substitute parts support extended operating temperature ranges (-65°C to 200°C), exceeding the 175°C requirement of the original part.

Qualified Substitute (Electrical Equivalence with Parameter Variance):

BZV85-C43,113 (NXP USA Inc.) is a qualified substitute with matching Zener voltage and tolerance specifications. This device maintains the 1.3 W power rating and 70 Ohms impedance specification. The BZV85-C43,113 exhibits superior reverse leakage characteristics (50 nA @ 30 V versus 5 µA @ 32.7 V) and lower forward voltage (1 V @ 50 mA versus 1.2 V @ 200 mA). The device is packaged in DO-204AL, DO-41 axial configuration with extended operating temperature support (-65°C to 200°C). Inventory availability is substantial at 35,930 pcs.

Limited Substitute (Power Rating Reduction):

BZX79-C43,133 (Nexperia USA Inc.) maintains the 43 V Zener voltage and ±5% tolerance but operates at reduced maximum power (400 mW versus 1.3 W). The impedance specification is elevated to 150 Ohms. This device is suitable only for applications where power dissipation does not exceed 400 mW. The package configuration differs (DO-204AH, DO-35 versus DO-204AL, DO-41), requiring mechanical verification for board-level compatibility. Reverse leakage is elevated at 55 µA @ 700 mV. This substitute is appropriate for low-power voltage reference applications only.

Compliance Considerations:

The 1N4755A-TAP carries AEC-Q101 automotive qualification. Direct substitutes 1N4755A (Lumimax) and 1N4755A-T50A (Fairchild) do not specify automotive qualification status. BZV85-C43,113 (NXP) does not specify automotive qualification. BZX79-C43,133 (Nexperia) carries ROHS3 compliance matching the original part. For automotive applications requiring AEC-Q101 certification, the original 1N4755A-TAP or equivalent AEC-Q101 qualified devices must be specified.

Frequently Asked Questions (FAQ)

Q: Can the 1N4755A (Lumimax) directly replace the 1N4755A-TAP in all applications?

A: The 1N4755A from Lumimax maintains identical electrical specifications for Zener voltage (43 V), tolerance (±5%), impedance (70 Ohms), and forward voltage characteristics. Both devices use through-hole axial packaging (DO-41). The primary difference is that the Lumimax device does not specify AEC-Q101 automotive qualification. For non-automotive applications, direct substitution is valid. For automotive applications requiring AEC-Q101 certification, the original 1N4755A-TAP must be used.

Q: What is the difference between the 1N4755A-T50A and the 1N4755A-TAP?

A: Both devices share identical Zener voltage (43 V), tolerance (±5%), and impedance (70 Ohms) specifications. The 1N4755A-T50A from Fairchild operates at 1 W maximum power versus 1.3 W for the Vishay part. The 1N4755A-T50A supports extended operating temperature (-65°C to 200°C) compared to the 175°C junction temperature of the original. Both use through-hole axial DO-41 packaging. The 1N4755A-T50A is suitable for applications where 1 W power dissipation is sufficient.

Q: Is the BZV85-C43,113 from NXP a suitable replacement?

A: The BZV85-C43,113 maintains the 43 V Zener voltage, ±5% tolerance, 1.3 W power rating, and 70 Ohms impedance. The device is packaged in DO-204AL, DO-41 axial configuration, matching the original. The BZV85-C43,113 exhibits superior reverse leakage performance (50 nA @ 30 V) and lower forward voltage (1 V @ 50 mA). This device is electrically equivalent and mechanically compatible. Automotive qualification status is not specified for the NXP device.

Q: Why is the BZX79-C43,133 listed as a limited substitute?

A: The BZX79-C43,133 from Nexperia operates at 400 mW maximum power, which is significantly lower than the 1.3 W rating of the original 1N4755A-TAP. This device is suitable only for low-power applications where power dissipation does not exceed 400 mW. Additionally, the impedance specification is elevated to 150 Ohms, and the package configuration is DO-204AH, DO-35 rather than DO-204AL, DO-41. Mechanical verification is required before substitution.

Q: What packaging differences exist between substitute parts?

A: The 1N4755A-TAP, 1N4755A (Lumimax), 1N4755A-T50A (Fairchild), and BZV85-C43,113 (NXP) all use DO-204AL, DO-41 axial through-hole packaging and are mechanically interchangeable. The BZX79-C43,133 (Nexperia) uses DO-204AH, DO-35 axial packaging, which differs in physical dimensions. Verification of board-level hole spacing and component clearance is required before substituting the Nexperia device.

Q: Are all substitute parts RoHS compliant?

A: The 1N4755A-TAP and BZX79-C43,133 are ROHS3 compliant. The 1N4755A from Lumimax is RoHS compliant. The 1N4755A-T50A from Fairchild and BZV85-C43,113 from NXP do not specify RoHS compliance status in the provided data. For applications requiring RoHS compliance certification, verification with the manufacturer is recommended.

Q: Which substitute offers the best reverse leakage performance?

A: The BZV85-C43,113 from NXP exhibits the lowest reverse leakage at 50 nanoamperes @ 30 V, compared to 5 microamperes @ 32.7 V for the original 1N4755A-TAP. The BZX79-C43,133 from Nexperia exhibits elevated reverse leakage at 55 microamperes @ 700 mV. For applications requiring minimal reverse leakage, the BZV85-C43,113 is the preferred substitute.

Q: Can the 1N4755A-TAP be used in automotive applications with any substitute?

A: The 1N4755A-TAP carries AEC-Q101 automotive qualification. Substitute parts 1N4755A (Lumimax), 1N4755A-T50A (Fairchild), BZV85-C43,113 (NXP), and BZX79-C43,133 (Nexperia) do not specify AEC-Q101 qualification in the provided data. For automotive applications requiring AEC-Q101 certification, the original 1N4755A-TAP or an equivalent AEC-Q101 qualified device must be specified. Substitution without automotive qualification verification is not permitted for regulated automotive applications.

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