DL4759A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The DL4759A-TP is a 62 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 equivalent substitute parts for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical specifications while offering alternative packaging formats or active product status from current manufacturers.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	62 V
Tolerance	±5%
Power - Max	1 W
Impedance (Max)	125 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 47.1 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA
Operating Temperature Range	-65°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	DO-213AB, MELF
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the DL4759A-TP are qualified based on the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

Zener voltage: 62 V nominal
Tolerance: ±5%
Maximum power dissipation: 1 W
Maximum impedance: 125 Ohms
Reverse leakage current: 5 µA @ 47.1 V
Forward voltage: 1.2 V @ 200 mA

Mechanical Compatibility Criteria:

Surface mount mounting type
Operating temperature range compatibility
RoHS3 compliance
MSL rating of 1 (Unlimited)

Substitute parts are grouped into two categories: direct package equivalents and parametric equivalents with alternative packaging. All substitutes maintain identical electrical performance specifications while differing in package format or manufacturer source.

Parameter Comparison

Parameter	DL4759A-TP (Main)	SMAJ4759A-TP (Substitute)	1N4759AUR/TR (Substitute)
Manufacturer	Micro Commercial Co	Micro Commercial Co	Microchip Technology
Voltage - Zener (Nom)	62 V	62 V	62 V
Tolerance	±5%	±5%	±5%
Power - Max	1 W	1 W	1 W
Impedance (Max)	125 Ohms	125 Ohms	125 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 47.1 V	5 µA @ 47.1 V	5 µA @ 47.1 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	Not specified	1.2 V @ 200 mA
Operating Temperature Range	-65°C ~ 175°C	-65°C ~ 150°C	-65°C ~ 175°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AB, MELF	DO-214AC, SMA	DO-213AB, MELF
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Not specified

Engineering Selection Recommendations

SMAJ4759A-TP (Micro Commercial Co): This substitute offers active product status with identical electrical specifications. The primary difference is the package format: DO-214AC (SMA) versus the original DO-213AB (MELF). The operating temperature range is reduced to -65°C ~ 150°C, which is 25°C lower at the maximum temperature. This part is suitable for applications where the reduced upper temperature limit is acceptable and where SMA package footprint compatibility exists. ROHS3 compliance and MSL rating of 1 are maintained.

1N4759AUR/TR (Microchip Technology): This substitute maintains the original DO-213AB (MELF) package format and operating temperature range (-65°C ~ 175°C), providing direct mechanical and thermal compatibility. Electrical specifications are identical to the main part. Active product status from Microchip Technology ensures long-term availability. ROHS3 compliance is confirmed. This part is the preferred substitute when package format and thermal operating range must remain unchanged.

Selection between substitutes depends on PCB layout constraints and thermal requirements. The 1N4759AUR/TR provides maximum compatibility with the original design. The SMAJ4759A-TP requires PCB layout modification but offers alternative sourcing from the original manufacturer.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4759A-TP be used as a direct replacement for DL4759A-TP?

A: SMAJ4759A-TP is electrically equivalent but uses a different package format (DO-214AC/SMA versus DO-213AB/MELF). PCB layout and footprint modifications are required. The operating temperature maximum is reduced from 175°C to 150°C.

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

A: The 1N4759AUR/TR maintains the original MELF package and full -65°C to 175°C temperature range. The SMAJ4759A-TP uses an SMA package and operates to 150°C maximum. Both are electrically identical at rated specifications.

Q: Are all three parts RoHS3 compliant?

A: Yes. DL4759A-TP, SMAJ4759A-TP, and 1N4759AUR/TR are all ROHS3 compliant.

Q: Does the reduced operating temperature range of SMAJ4759A-TP affect functionality?

A: The SMAJ4759A-TP operates from -65°C to 150°C versus -65°C to 175°C for the main part and 1N4759AUR/TR. Applications requiring operation above 150°C must use the 1N4759AUR/TR.

Q: What is the moisture sensitivity level for all parts?

A: DL4759A-TP and SMAJ4759A-TP both have MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions. MSL data for 1N4759AUR/TR is not provided in the specification.

Q: Can these parts be used interchangeably in the same PCB design?

A: 1N4759AUR/TR can be used as a direct replacement without PCB modifications. SMAJ4759A-TP requires footprint changes due to different package format and may require thermal design review due to the reduced maximum operating temperature.

Q: What is the base product number for each part?

A: DL4759A-TP base number is DL4759. SMAJ4759A-TP base number is SMAJ4759. 1N4759AUR/TR is based on the 1N4759A series.

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