1N4758A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4758A-TP is a 56 V, 1 W Zener diode manufactured by Micro Commercial Co in DO-41G axial through-hole package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design and procurement requirements. Substitute parts must maintain electrical performance within the specified tolerance and operating parameters while accommodating packaging and availability constraints.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	56	V
Tolerance	±5%	%
Power - Max	1	W
Impedance (Max)	110	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 42.6 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65°C ~ 200°C	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—

Substitute Part Grouping Explanation

Substitution of the 1N4758A-TP is determined by the following critical parameters:

Electrical Parameters (Must Match):

Zener voltage: 56 V nominal
Tolerance: ±5%
Power rating: 1 W (minimum)
Impedance (Max): 110 Ohms (maximum)
Reverse leakage current: 5 µA @ 42.6 V (maximum)
Forward voltage: 1.2 V @ 200 mA (maximum)

Mechanical Parameters (Must Match):

Mounting type: Through Hole
Package compatibility: DO-204AL, DO-41, or Axial

Environmental Parameters (Must Match or Exceed):

Operating temperature range: -65°C to 200°C minimum

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Equivalents: Parts from different manufacturers with identical electrical and mechanical specifications.
Similar Equivalents: Parts with matching electrical parameters but different packaging formats (Cut Tape vs. Tape & Reel).
Parametric Equivalents: Parts meeting all electrical and mechanical requirements with potential variations in operating temperature or impedance within acceptable limits.
Higher Power Alternatives: Parts with superior power ratings suitable for applications requiring increased thermal headroom.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Ir @ Vr (µA)	Vf @ If (V)	Temp Range (°C)	Package	Status
1N4758A-TP	Micro Commercial Co	56	±5%	1	110	5 @ 42.6	1.2 @ 200mA	-65 ~ 200	DO-41G	Obsolete
1N4758AP-TP	Micro Commercial Co	56	±5%	1	110	5 @ 42.6	1.2 @ 200mA	-65 ~ 150	DO-41	Active
1N4758A-T50A	onsemi	56	±5%	1	110	5 @ 42.6	—	-65 ~ 200	DO-41	Active
1N4758A	SMC Diode Solutions	56	±5%	1	110	5 @ 42.6	1.2 @ 200mA	—	DO-41	Obsolete
1N4758AP/TR8	Microchip Technology	56	±5%	1	110	5 @ 42.6	1.2 @ 200mA	-65 ~ 150	DO-204AL	Active
1N5087	Microchip Technology	56	±5%	3	70	1 @ 42.6	—	-65 ~ 175	Axial	Active
1N4758A TR PBFREE	Central Semiconductor Corp	56	±5%	1	110	5 @ 42.6	1.2 @ 200mA	-65 ~ 200	DO-41	Active
1N4758G	Taiwan Semiconductor Corporation	56	±5%	1	110	5 @ 42.6	1.2 @ 200mA	-65 ~ 200	DO-204AL	Active

Engineering Selection Recommendations

Primary Recommendation: 1N4758A-T50A (onsemi)

The 1N4758A-T50A from onsemi is the preferred direct substitute. This part maintains all critical electrical parameters identical to the 1N4758A-TP, including 56 V nominal Zener voltage, 1 W power rating, 110 Ohms maximum impedance, and 5 µA reverse leakage current. The operating temperature range extends to 200°C, matching the original specification. The part is in active production status with substantial inventory availability (21,200 units). RoHS3 compliance and REACH unaffected status align with current regulatory requirements.

Secondary Recommendation: 1N4758A TR PBFREE (Central Semiconductor Corp)

The 1N4758A TR PBFREE provides full electrical equivalence with identical specifications across all critical parameters. Operating temperature range extends to 200°C. This part is actively produced with high inventory levels (4,508 units) and carries RoHS3 compliance certification.

Alternative Recommendation: 1N4758AP-TP (Micro Commercial Co)

The 1N4758AP-TP is an active equivalent from the original manufacturer. All electrical parameters match the 1N4758A-TP. The operating temperature range is limited to -65°C to 150°C, which is acceptable for applications not requiring the full 200°C upper limit. This part is available in active production (688 units).

Higher Power Alternative: 1N5087 (Microchip Technology)

The 1N5087 is suitable for applications requiring increased power dissipation capability. This part maintains the 56 V nominal Zener voltage and ±5% tolerance. The power rating is 3 W, providing superior thermal headroom compared to the 1 W specification. Impedance is reduced to 70 Ohms maximum, and reverse leakage current is lower at 1 µA. Operating temperature range is -65°C to 175°C. This part is actively produced with 834 units in stock. Selection of this part is appropriate only when circuit design permits the lower impedance characteristic.

Not Recommended: 1N4758AP/TR8 (Microchip Technology)

While electrically equivalent, this part carries RoHS non-compliant status, making it unsuitable for new designs subject to RoHS requirements.

Not Recommended: 1N4758A (SMC Diode Solutions)

This part is obsolete and lacks complete operating temperature specification documentation.

Frequently Asked Questions (FAQ)

Q: Can the 1N4758AP-TP be used as a direct replacement for the 1N4758A-TP?

A: Yes. The 1N4758AP-TP is electrically equivalent with identical Zener voltage (56 V), tolerance (±5%), power rating (1 W), impedance (110 Ohms), and reverse leakage current (5 µA @ 42.6 V). The operating temperature range is -65°C to 150°C, which is narrower than the original -65°C to 200°C specification. This substitution is valid for applications operating within the -65°C to 150°C range.

Q: What is the difference between DO-41 and DO-204AL packaging?

A: DO-41 and DO-204AL are equivalent designations for the same axial through-hole package format. Both refer to a cylindrical component with leads extending from each end. Parts specified as DO-204AL (DO-41) or DO-41G are mechanically and electrically interchangeable in through-hole PCB applications.

Q: Why is the 1N5087 listed as a substitute if it has different electrical parameters?

A: The 1N5087 is a higher power alternative (3 W vs. 1 W) with the same 56 V Zener voltage and ±5% tolerance. It is suitable for applications where the original 1 W rating is insufficient or where lower impedance (70 Ohms vs. 110 Ohms) is beneficial. The 1N5087 is not a direct replacement but rather an upgrade option for designs requiring increased power dissipation capability.

Q: What does RoHS3 compliance mean for component selection?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials including lead, mercury, cadmium, and certain flame retardants. For new designs and procurement, RoHS3 compliant parts are required in most jurisdictions. The 1N4758A-TP, 1N4758A-T50A, 1N4758A TR PBFREE, and 1N4758G all carry RoHS3 compliance certification.

Q: Are there packaging format differences between substitute parts?

A: Yes. The 1N4758A-TP is supplied in Cut Tape (CT) format. Equivalent parts are available in Tape & Reel (TR) format (1N4758AP-TP, 1N4758AP/TR8, 1N4758G) or Bulk format (1N5087). Cut Tape and Tape & Reel formats are both suitable for automated assembly. Bulk format is typically used for manual assembly or lower-volume applications. Packaging format selection depends on manufacturing process requirements, not electrical performance.

Q: Can the 1N4758A-TP be used in applications requiring operation above 150°C?

A: Yes, provided the substitute part also supports the extended temperature range. The 1N4758A-T50A, 1N4758A TR PBFREE, and 1N4758G all support operation to 200°C, matching the original specification. The 1N4758AP-TP is limited to 150°C and is not suitable for applications requiring higher temperature operation.

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

A: The ±5% tolerance indicates the Zener voltage will be within 53.2 V to 58.8 V (56 V ± 5%). All listed substitute parts maintain this tolerance specification, ensuring consistent voltage regulation performance across the specified range. Tolerance is a critical parameter for voltage regulation applications and must not be exceeded in substitution.

Q: Is the 1N4758AP/TR8 suitable for new designs?

A: The 1N4758AP/TR8 is electrically equivalent but carries RoHS non-compliant status. For new designs subject to RoHS requirements, this part is not suitable. Alternative parts with RoHS3 compliance (1N4758A-T50A, 1N4758A TR PBFREE, 1N4758G) are recommended.

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