DL4761A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The DL4761A-TP is a 75 V, 1 W surface mount zener diode manufactured by Micro Commercial Co in MELF (DO-213AB) package format. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and procurement needs. The substitute part maintains identical electrical specifications while offering improved availability through active product status.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	75 V
Tolerance	±5%
Power - Max	1 W
Impedance (Max)	175 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 56 V
Voltage - Forward (Vf) (Max)	1.2 V
Operating Temperature Range	-65°C ~ 175°C (DL4761A-TP) / -65°C ~ 150°C (SMAJ4761A-TP)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution between the DL4761A-TP and SMAJ4761A-TP is based on electrical parameter equivalence across the following criteria:

Electrical Equivalence Parameters:

Nominal zener voltage: 75 V
Voltage tolerance: ±5%
Maximum power dissipation: 1 W
Maximum impedance: 175 Ohms
Reverse leakage current: 5 µA @ 56 V
Forward voltage: 1.2 V maximum

Mechanical Compatibility Considerations:

Both components utilize surface mount technology
Package formats differ: DL4761A-TP uses MELF (DO-213AB); SMAJ4761A-TP uses DO-214AC (SMA)
PCB footprint redesign is required when transitioning between package types

Compliance Alignment:

Both parts maintain ROHS3 compliance
Both parts are REACH unaffected
Both parts carry MSL rating of 1 (Unlimited)

Parameter Comparison

Parameter	DL4761A-TP (Main Part)	SMAJ4761A-TP (Substitute)	Match Status
Manufacturer	Micro Commercial Co	Micro Commercial Co	Identical
Category	Diodes, Zener	Diodes, Zener	Identical
Voltage - Zener (Nom)	75 V	75 V	Identical
Tolerance	±5%	±5%	Identical
Power - Max	1 W	1 W	Identical
Impedance (Max)	175 Ohms	175 Ohms	Identical
Current - Reverse Leakage @ Vr	5 µA @ 56 V	5 µA @ 56 V	Identical
Voltage - Forward (Vf) (Max)	1.2 V @ 200 mA	1.2 V @ 100 mA	Equivalent
Operating Temperature Range	-65°C ~ 175°C	-65°C ~ 150°C	Substitute Range Narrower
Mounting Type	Surface Mount	Surface Mount	Identical
Package / Case	DO-213AB, MELF	DO-214AC, SMA	Different
Product Status	Obsolete	Active	Substitute Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Identical

Engineering Selection Recommendations

Primary Substitute: SMAJ4761A-TP

The SMAJ4761A-TP is the direct electrical equivalent for the obsolete DL4761A-TP. Selection of this substitute is based on:

Electrical Specification Match: All critical zener parameters (voltage, tolerance, power rating, impedance, and leakage current) are identical between the two parts.
Active Product Status: The SMAJ4761A-TP maintains active product status with significantly higher inventory availability (57,333 pcs vs. 830 pcs), ensuring long-term procurement viability.
Compliance Continuity: Both parts maintain identical ROHS3 compliance, REACH unaffected status, and MSL rating of 1, supporting regulatory and environmental requirements.
Package Transition Requirement: Implementation of SMAJ4761A-TP requires PCB footprint modification due to package format change from MELF (DO-213AB) to DO-214AC (SMA). This is a mechanical consideration only and does not affect electrical performance.
Operating Temperature Consideration: The substitute part operates across -65°C to 150°C, compared to the main part's -65°C to 175°C range. Applications requiring operation above 150°C must retain the original part or identify alternative solutions.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4761A-TP directly replace DL4761A-TP without circuit modification?

A: Electrical substitution is direct. However, PCB layout modification is required due to package format differences (MELF vs. SMA). The component footprints are not interchangeable.

Q: What is the primary difference between these two parts?

A: The parts are electrically identical. The main differences are package format (MELF vs. DO-214AC SMA) and product status (obsolete vs. active). The substitute offers improved availability and active manufacturer support.

Q: Are there any performance differences in the forward voltage specification?

A: Forward voltage maximum is 1.2 V for both parts. The test current differs (200 mA for DL4761A-TP vs. 100 mA for SMAJ4761A-TP), but this does not affect circuit performance at the specified maximum rating.

Q: Does the operating temperature range difference affect substitution?

A: The substitute part operates to 150°C maximum, while the original operates to 175°C. For applications requiring operation above 150°C, the original part specification must be retained. For applications within the 150°C limit, substitution is valid.

Q: Are both parts RoHS compliant?

A: Yes. Both DL4761A-TP and SMAJ4761A-TP are ROHS3 compliant with MSL rating of 1 (Unlimited), supporting standard manufacturing and storage conditions.

Q: What is the impact of switching from MELF to SMA package?

A: The package change requires PCB footprint redesign. Both packages are surface mount and offer equivalent electrical performance. The SMA package (DO-214AC) is more widely used in modern designs and offers better availability.

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