1N4737A-TAP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4737A-TAP is a through-hole zener diode manufactured by Vishay General Semiconductor - Diodes Division, rated at 7.51 V nominal zener voltage with 1.3 W maximum power dissipation in a DO-41 package. This component is classified as Active product status with AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are identified to address inventory availability, alternative packaging formats, or equivalent electrical performance across different manufacturers while maintaining functional compatibility in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	7.51	V
Tolerance	±5%	%
Power - Max	1.3	W
Impedance (Max)	4	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 5 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	-
Grade	Automotive	-
Qualification	AEC-Q101	-

Substitute Part Grouping Explanation

Substitution of the 1N4737A-TAP is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage nominal rating within ±5% tolerance band (7.51 V ± 5% = 7.13 V to 7.89 V)
Maximum power dissipation rating equal to or greater than 1.3 W
Maximum impedance (Zzt) equal to or less than 4 Ohms
Reverse leakage current at specified voltage
Forward voltage characteristics
Through-hole mounting configuration
DO-41 package compatibility (DO-204AL designation)

Acceptable Variations:

Operating temperature range may extend beyond the main part specification
Packaging format (Cut Tape, Bulk, Tape & Reel) does not affect electrical substitution
Manufacturer differences are acceptable provided electrical parameters align
RoHS compliance status variations are noted but do not prevent substitution

Non-Substitutable Conditions:

Zener voltage outside the ±5% tolerance band
Maximum power rating below 1.3 W
Impedance exceeding 4 Ohms
Surface-mount or alternative package types

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom) [V]	Tolerance [%]	Power Max [W]	Zzt Max [Ohms]	Ir @ Vr [µA]	Vf Max @ If [V]	Temp Range [°C]	Package	RoHS Status
1N4737A-TAP	Vishay General Semiconductor	7.51	±5	1.3	4	10 @ 5V	1.2 @ 200mA	-65 to 175	DO-41	ROHS3
1N4737A	Lumimax Optoelectronic Technology	7.5	±5	1	4	10 @ 5V	1.2 @ 200mA	-65 to 200	DO-41	RoHS Compliant
1N4737A,113	Nexperia USA Inc.	7.5	±5	1	4	10 @ 5V	1.2 @ 200mA	-65 to 200	DO-41	ROHS3
1N4737A,133	Nexperia USA Inc.	7.5	±5	1	4	10 @ 5V	1.2 @ 200mA	-65 to 200	DO-41	ROHS3
1N4737A-T50A	Fairchild Semiconductor	7.5	±5	1	4	10 @ 5V	Not specified	-65 to 200	DO-41	Not specified
1N4737ATR	Fairchild Semiconductor	7.5	±5	1	4	10 @ 5V	Not specified	-65 to 200	DO-41	Not specified
2EZ7.5D5	Microchip Technology	7.5	±5	2	2	5 @ 5V	1.2 @ 200mA	-65 to 150	DO-41	RoHS non-compliant
BZV85-C7V5,113	Nexperia USA Inc.	7.5	±5	1.3	3	1 @ 4.5V	1 @ 50mA	-65 to 200	DO-41	ROHS3

Engineering Selection Recommendations

Direct Substitutes (Electrical Equivalence with Minor Derating):

The 1N4737A variants from Nexperia USA Inc. (part numbers 1N4737A,113 and 1N4737A,133) and Fairchild Semiconductor (1N4737A-T50A and 1N4737ATR) are functionally equivalent substitutes. These parts maintain the 7.5 V zener voltage specification within the ±5% tolerance band and 4 Ohms maximum impedance. The primary difference is reduced maximum power rating (1 W versus 1.3 W), which requires circuit verification to confirm adequate thermal margin. All substitute parts maintain through-hole DO-41 package compatibility and ±5% voltage tolerance. ROHS3 compliance is maintained across Nexperia variants.

Enhanced Performance Substitute:

The BZV85-C7V5,113 from Nexperia USA Inc. provides superior electrical characteristics with 1.3 W power rating matching the main part, reduced impedance (3 Ohms versus 4 Ohms), and significantly lower reverse leakage current (1 µA versus 10 µA). This part is suitable for applications requiring tighter leakage specifications. ROHS3 compliance and extended operating temperature range (-65°C to 200°C) are maintained.

Higher Power Substitute:

The 2EZ7.5D5 from Microchip Technology offers increased power dissipation (2 W) and improved impedance (2 Ohms), suitable for applications requiring higher thermal capacity. This part is applicable when circuit design permits operation at lower impedance. Note that RoHS non-compliance status and reduced maximum operating temperature (-65°C to 150°C) must be evaluated against application requirements.

Lumimax Optoelectronic Technology Alternative:

The 1N4737A from Lumimax provides equivalent electrical performance with 1 W power rating and extended operating temperature range (-65°C to 200°C). This option is suitable for applications with reduced power dissipation requirements.

Frequently Asked Questions (FAQ)

Q: Can the 1N4737A-TAP be replaced with a 1 W rated zener diode?

A: Substitution with 1 W rated parts (1N4737A from Lumimax, 1N4737A,113, 1N4737A,133, 1N4737A-T50A, or 1N4737ATR) is permissible when circuit analysis confirms that maximum power dissipation does not exceed 1 W under all operating conditions. The original 1.3 W specification provides thermal margin; reduction to 1 W requires verification that junction temperature remains within acceptable limits.

Q: What is the difference between 1N4737A,113 and 1N4737A,133?

A: Both parts are manufactured by Nexperia USA Inc. with identical electrical specifications (7.5 V, 1 W, ±5% tolerance, 4 Ohms impedance). The suffix designations (,113 and ,133) represent different packaging or tape configurations. Electrical substitution between these parts is direct.

Q: Is the BZV85-C7V5,113 a direct replacement for the 1N4737A-TAP?

A: The BZV85-C7V5,113 is electrically compatible with superior performance characteristics. It maintains 7.5 V zener voltage, ±5% tolerance, and provides equal or better electrical parameters (1.3 W power, 3 Ohms impedance, lower leakage current). The part is a direct substitute with enhanced specifications.

Q: Can the 2EZ7.5D5 be used in place of the 1N4737A-TAP?

A: The 2EZ7.5D5 is electrically compatible with 7.5 V zener voltage and ±5% tolerance. The higher power rating (2 W) and lower impedance (2 Ohms) provide enhanced performance. However, the reduced maximum operating temperature (-65°C to 150°C versus 175°C) and RoHS non-compliance status must be evaluated against application requirements.

Q: Are all substitute parts available in DO-41 package?

A: All listed substitute parts are specified for DO-41 package (DO-204AL designation) with through-hole mounting configuration. Package compatibility is maintained across all substitutes.

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

A: The ±5% tolerance indicates that the zener voltage will fall within the range of 7.13 V to 7.89 V for the main part (7.51 V ± 5%) and 7.125 V to 7.875 V for substitute parts rated at 7.5 V. All listed substitutes maintain this tolerance specification, ensuring circuit compatibility within design margins.

Q: Does packaging format (Cut Tape, Bulk, Tape & Reel) affect electrical substitution?

A: Packaging format does not affect electrical performance or substitution compatibility. Cut Tape, Bulk, and Tape & Reel formats represent different supply configurations for the same electrical component. Selection is based on procurement and assembly requirements rather than electrical characteristics.

Q: What is the difference between ROHS3 and RoHS Compliant designations?

A: Both designations indicate compliance with Restriction of Hazardous Substances regulations. ROHS3 represents the current regulatory standard. Differences in designation do not affect electrical substitution compatibility.

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