1N4756A-T Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4756A-T is a 47 V, 1 W zener diode manufactured by Diodes Incorporated in DO-41 through-hole packaging. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and production continuity. The part operates across a temperature range of -65°C to 175°C with ±5% voltage tolerance and is RoHS3 compliant.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	47	V
Power - Maximum	1	W
Tolerance	±5	%
Impedance (Maximum)	80	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 35.8 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

Substitute parts for the 1N4756A-T are classified based on electrical parameter compatibility and physical packaging equivalence. The primary substitution criteria are:

Critical Parameters for Substitution:

Zener voltage: 47 V nominal
Tolerance: ±5%
Mounting type: Through Hole
Package compatibility: DO-41 or DO-204AL (DO-41)

Substitution Categories:

Direct Electrical Equivalents (1 W Power Rating): Parts maintaining identical 1 W power dissipation, 47 V zener voltage, and ±5% tolerance with active product status and modern compliance certifications.

Higher Power Rated Substitutes (1.5 W to 3 W): Parts with 47 V zener voltage and ±5% tolerance but increased power ratings. These provide enhanced thermal margin and are electrically compatible in applications where the original 1 W rating is not a limiting constraint.

Enhanced Performance Substitutes (2 W Power Rating): Parts with improved impedance characteristics and lower reverse leakage current, offering superior voltage regulation performance while maintaining 47 V specification and ±5% tolerance.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (W)	Tolerance (%)	Zzt (Ohms)	Ir @ Vr (µA)	Vf @ If (V)	Temp Range (°C)	Package	Product Status	RoHS
1N4756A-T	Diodes Incorporated	47	1	±5	80	5 @ 35.8	1.2 @ 200	-65 to 175	DO-41	Obsolete	ROHS3
1N4756A	Lumimax Optoelectronic Technology	47	1	±5	80	5 @ 35.8	1.2 @ 200	-65 to 200	DO-41G	Active	RoHS
1N4756AP/TR8	Microchip Technology	47	1	±5	80	5 @ 35.8	1.2 @ 200	-65 to 150	DO-204AL	Active	Non-compliant
1N4756AE3	Microchip Technology	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Active	ROHS3
1N4756AGE3	Microchip Technology	47	1	±5	80	5 @ 35.8	1.2 @ 200	-65 to 175	DO-41	Active	ROHS3
1N4756AP/TR12	Microchip Technology	47	1	±5	80	5 @ 35.8	1.2 @ 200	-65 to 150	DO-204AL	Active	Non-compliant
1N5941B3P-TP	Micro Commercial Co	47	3	±5	67	1 @ 35.8	1.5 @ 200	-55 to 175	DO-41	Active	Not specified
1N5941BP-TP	Micro Commercial Co	47	1.5	±5	67	1 @ 35.8	1.5 @ 200	-55 to 175	DO-41	Active	ROHS3
2EZ47D5	Microsemi Corporation	47	2	±5	40	0.5 @ 35.8	1.2 @ 200	-65 to 150	DO-204AL	Active	ROHS3
2EZ47D5-TP	Micro Commercial Co	47	2	±5	40	0.5 @ 35.8	1.2 @ 200	-55 to 150	DO-41	Active	ROHS3
1N4756AGE3/TR	Microchip Technology	47	1	±5	80	5 @ 35.8	1.2 @ 200	-65 to 175	DO-41	Active	ROHS3

Engineering Selection Recommendations

For Direct Replacement with Active Status and Full Compliance:

The 1N4756AGE3 and 1N4756AGE3/TR (Microchip Technology) are the primary recommended substitutes. Both parts maintain identical electrical specifications to the original 1N4756A-T, including 47 V zener voltage, 1 W power rating, ±5% tolerance, 80 Ohms maximum impedance, and -65°C to 175°C operating temperature range. Both are active products with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The 1N4756AGE3/TR variant is supplied in Tape & Reel packaging, suitable for automated assembly processes.

For Applications Requiring Extended Temperature Range:

The 1N4756A (Lumimax Optoelectronic Technology) provides identical electrical performance with an extended upper operating temperature limit of 200°C compared to the original 175°C specification. This part is active and RoHS compliant, offering improved thermal margin for high-temperature environments.

For Applications Tolerating Reduced Temperature Range:

The 1N4756AP/TR8 and 1N4756AP/TR12 (Microchip Technology) maintain full electrical equivalence but operate to 150°C maximum. These parts are active but RoHS non-compliant. Selection is appropriate only when regulatory compliance is not required.

For Applications Requiring Enhanced Power Dissipation:

The 2EZ47D5 (Microsemi Corporation) and 2EZ47D5-TP (Micro Commercial Co) provide 2 W power rating with improved impedance characteristics (40 Ohms versus 80 Ohms) and significantly lower reverse leakage current (500 nA versus 5 µA). Both are ROHS3 compliant and active. These parts are suitable for applications where thermal margin or superior voltage regulation is required.

The 1N5941BP-TP (Micro Commercial Co) provides 1.5 W power rating with 67 Ohms impedance and 1 µA reverse leakage current. This part is ROHS3 compliant and active, offering intermediate power capability.

For Applications with Relaxed Compliance Requirements:

The 1N4756AE3 (Microchip Technology) is active and ROHS3 compliant but lacks detailed electrical parameter specifications in available documentation. This part is suitable only when complete parameter verification through manufacturer datasheets is performed.

Frequently Asked Questions (FAQ)

Q: Can the 1N4756AGE3 directly replace the obsolete 1N4756A-T without circuit modification?

A: Yes. The 1N4756AGE3 maintains identical zener voltage (47 V), power rating (1 W), tolerance (±5%), impedance (80 Ohms), and operating temperature range (-65°C to 175°C). Electrical and mechanical compatibility is complete. No circuit modification is required.

Q: What is the difference between 1N4756AGE3 and 1N4756AGE3/TR?

A: Both parts are electrically and mechanically identical. The primary difference is packaging format: 1N4756AGE3 is supplied in Bag packaging, while 1N4756AGE3/TR is supplied in Tape & Reel format. Selection depends on assembly process requirements. Tape & Reel format is standard for automated pick-and-place assembly.

Q: Are the higher power-rated substitutes (2EZ47D5, 1N5941BP-TP) compatible with the original 1N4756A-T circuit?

A: Yes, from an electrical standpoint. All substitute parts maintain the 47 V zener voltage and ±5% tolerance. Higher power ratings provide additional thermal margin and do not create circuit incompatibility. However, physical package dimensions must be verified for mechanical fit in the PCB layout, as some variants use different case designations (DO-204AL versus DO-41).

Q: What is the significance of the DO-41 versus DO-204AL package designation?

A: DO-41 and DO-204AL are equivalent package designations for the same axial through-hole diode form factor. Both refer to a cylindrical component with axial leads. Parts specified as either DO-41 or DO-204AL (DO-41) are mechanically interchangeable in through-hole PCB applications.

Q: Why do some substitute parts have reduced operating temperature ranges?

A: The 1N4756AP/TR8 and 1N4756AP/TR12 variants are specified to -65°C to 150°C, compared to the original -65°C to 175°C. This represents a manufacturing or qualification difference. Selection of these parts is appropriate only for applications where the maximum operating temperature does not exceed 150°C.

Q: What does RoHS3 compliance mean for this component?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, hexavalent chromium, and specified brominated flame retardants. ROHS3 compliant parts are required for most commercial and industrial applications in regulated markets. Non-compliant parts may be restricted or prohibited depending on end-use application and regional regulations.

Q: Can I use 1N4756AE3 as a substitute if detailed specifications are not provided?

A: The 1N4756AE3 is listed as an active, ROHS3 compliant part but lacks complete electrical parameter documentation in the provided data. Use of this part requires verification of full electrical specifications through the manufacturer's current datasheet before circuit integration. Direct substitution without specification confirmation is not recommended.

Q: What is the advantage of the 2EZ47D5 over the 1 W alternatives?

A: The 2EZ47D5 provides 2 W power dissipation with significantly improved impedance (40 Ohms versus 80 Ohms) and lower reverse leakage current (500 nA versus 5 µA). These characteristics result in superior voltage regulation performance and reduced temperature coefficient effects. Selection is appropriate for precision voltage reference applications or circuits requiring enhanced thermal stability.

Q: Are Tape & Reel packaged parts (TR designation) suitable for manual assembly?

A: Tape & Reel packaging is optimized for automated assembly processes using pick-and-place equipment. While manual assembly is technically possible, it is inefficient. For manual assembly applications, Bag or Box packaging formats are more practical. Verify packaging availability with the supplier before design finalization.

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