1N4754A-T Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4754A-T is a 39 V, 1 W Zener diode manufactured by Diodes Incorporated in DO-41 through-hole package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement. The 1N4754A-T maintains ROHS3 compliance and operates across a temperature range of -65°C to 175°C. Equivalent parts are available from multiple manufacturers with active product status, ensuring design continuity and supply chain reliability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	39	V
Tolerance	±5%	—
Power - Maximum	1	W
Impedance (Maximum)	60	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 29.7 V
Voltage - Forward (Maximum) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—

Substitute Part Grouping Explanation

Substitution of the 1N4754A-T is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nominal): 39 V
Tolerance: ±5%
Power - Maximum: 1 W
Impedance (Maximum): 60 Ohms
Current - Reverse Leakage @ Vr: 5 µA @ 29.7 V
Voltage - Forward (Maximum) @ If: 1.2 V @ 200 mA
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, Axial

Substitute Categories:

Parametric Equivalent: Parts with identical electrical specifications and matching package designations. These parts are direct functional replacements with no circuit redesign required.

Direct Manufacturer Equivalent: Active production parts from alternative manufacturers meeting all primary substitution criteria. These parts maintain full electrical and mechanical compatibility.

Upgrade Parts: Components with enhanced specifications (extended temperature range, improved compliance status) that exceed the original part requirements while maintaining backward compatibility.

Manufacturer Recommended Alternatives: Parts specified by original or alternative manufacturers as suitable replacements, including variants with modified tolerance or power ratings where application permits.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Ir @ Vr (µA)	Vf @ If (V)	Temp Range (°C)	Package	Product Status	RoHS Status
1N4754A-T	Diodes Incorporated	39	±5%	1	60	5 @ 29.7	1.2 @ 200 mA	-65 to 175	DO-41	Obsolete	ROHS3 Compliant
1N4754A	Lumimax Optoelectronic Technology	39	±5%	1	60	5 @ 29.7	1.2 @ 200 mA	-65 to 200	DO-41G	Active	RoHS Compliant
1N4754AP/TR8	Microchip Technology	39	±5%	1	60	5 @ 29.7	1.2 @ 200 mA	-65 to 150	DO-204AL (DO-41)	Active	RoHS non-compliant
1N4754A-T50A	onsemi	39	±5%	1	60	5 @ 29.7	Not specified	-65 to 200	DO-41	Active	ROHS3 Compliant
1EZ39D5-TP	Micro Commercial Co	39	±5%	1	60	5 @ 29.7	1.2 @ 200 mA	-55 to 150	DO-41	Active	Not specified
1N4754 G	Microsemi Corporation	39	±10%	1	60	5 @ 29.7	1.2 @ 200 mA	-65 to 175	DO-204AL (DO-41)	Active	RoHS non-compliant
1N4754A G	Microsemi Corporation	39	±5%	1	60	5 @ 29.7	1.2 @ 200 mA	-65 to 175	DO-204AL (DO-41)	Active	RoHS non-compliant
1N4754AGE3	Microchip Technology	39	±5%	1	60	5 @ 29.7	1.2 @ 200 mA	-65 to 175	DO-41	Active	ROHS3 Compliant
1N4754AP/TR12	Microchip Technology	39	±5%	1	60	5 @ 29.7	1.2 @ 200 mA	-65 to 150	DO-204AL (DO-41)	Active	RoHS non-compliant
1N5939B3P-TP	Micro Commercial Co	39	±5%	3	45	1 @ 29.7	1.5 @ 200 mA	-55 to 175	DO-41	Active	Not specified

Engineering Selection Recommendations

Primary Equivalent Selection:

The 1N4754A from Lumimax Optoelectronic Technology and 1N4754AGE3 from Microchip Technology are direct parametric equivalents with active product status. Both maintain the 39 V nominal zener voltage, ±5% tolerance, 1 W power rating, and 60 Ohm impedance specification. The Lumimax part extends the operating temperature range to 200°C, providing enhanced thermal performance. The Microchip 1N4754AGE3 maintains ROHS3 compliance matching the original part specification.

Compliance-Optimized Selection:

For applications requiring ROHS3 compliance, the 1N4754A-T50A from onsemi provides full electrical equivalence with extended temperature range (-65°C to 200°C) and active product status. This part is supplied in cut tape packaging and maintains all critical electrical parameters.

Alternative Manufacturer Options:

The 1N4754A G and 1N4754 G from Microsemi Corporation are active alternatives with identical electrical specifications. The 1N4754A G maintains ±5% tolerance matching the original part. Both Microsemi parts carry RoHS non-compliant status, requiring evaluation against application requirements.

Enhanced Power Rating Option:

The 1N5939B3P-TP from Micro Commercial Co provides a 3 W power rating at the same 39 V zener voltage. This part is suitable for applications requiring higher power dissipation capability while maintaining the same nominal voltage and tolerance specifications. The impedance is reduced to 45 Ohms and reverse leakage current is improved to 1 µA.

Temperature Range Considerations:

Applications operating at the upper temperature limit of 175°C are fully supported by all listed equivalents. For applications requiring extended operation to 200°C, the Lumimax 1N4754A and onsemi 1N4754A-T50A are specified options.

Frequently Asked Questions (FAQ)

Q: Can the 1N4754A-T be directly replaced with the 1N4754A from Lumimax?

A: Yes. Both parts maintain identical zener voltage (39 V), tolerance (±5%), power rating (1 W), impedance (60 Ohms), and reverse leakage current (5 µA @ 29.7 V). The Lumimax part extends the operating temperature range to 200°C and is in active production status. Package compatibility is confirmed for DO-41 through-hole applications.

Q: What is the difference between 1N4754AP/TR8 and 1N4754AP/TR12?

A: Both parts are manufactured by Microchip Technology with identical electrical specifications. The designation suffix indicates different tape reel configurations (TR8 and TR12 refer to reel specifications). Electrical performance and package type (DO-204AL, DO-41) are equivalent. Selection depends on procurement and assembly equipment compatibility.

Q: Is the 1N5939B3P-TP a suitable replacement for the 1N4754A-T?

A: The 1N5939B3P-TP maintains the 39 V zener voltage and ±5% tolerance but provides enhanced specifications: 3 W power rating (versus 1 W), 45 Ohm impedance (versus 60 Ohms), and 1 µA reverse leakage (versus 5 µA). This part is suitable for applications where higher power dissipation is beneficial or required. Circuit redesign is not necessary as the part is electrically compatible at the nominal operating point.

**Q: What is the significance of the tolerance difference in the 1N4754 G (±10%) versus 1N4754A-T (±5%)?

A: The 1N4754 G from Microsemi carries ±10% tolerance on the zener voltage, compared to ±5% for the 1N4754A-T. This wider tolerance may impact circuit performance in applications requiring precise voltage regulation. The 1N4754A G from Microsemi maintains ±5% tolerance and is the preferred Microsemi alternative for direct substitution.

Q: Are all listed substitutes available in the same packaging format?

A: All listed parts are supplied in through-hole axial packages designated as DO-41 or DO-204AL (DO-41). These designations are equivalent for through-hole mounting applications. Packaging variants include bulk, tape and reel (TR), cut tape (CT), and bag formats. Physical package dimensions and lead spacing are compatible across all listed parts.

Q: Which substitute part offers the best compliance status?

A: The 1N4754A-T50A from onsemi and 1N4754AGE3 from Microchip Technology both maintain ROHS3 compliance matching the original 1N4754A-T specification. The onsemi part additionally extends the operating temperature range to 200°C. Both parts are in active production status.

Q: Can the 1EZ39D5-TP be used in applications operating below -55°C?

A: The 1EZ39D5-TP from Micro Commercial Co is specified for operation from -55°C to 150°C. Applications requiring operation below -55°C require selection of alternative parts with extended lower temperature ratings. The 1N4754A-T, 1N4754A (Lumimax), 1N4754A-T50A (onsemi), and Microsemi variants all support operation to -65°C.

Q: What is the inventory status for substitute parts?

A: All listed substitute parts maintain active inventory status with quantities ranging from 692 to 6216 pieces. The Lumimax 1N4754A offers the highest inventory level at 5990 pieces. The onsemi 1N4754A-T50A provides 6216 pieces. Specific procurement requirements should be confirmed with component suppliers.

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