DL4742A-TP Equivalent & Substitute Parts

Part Overview

The DL4742A-TP is a Zener diode rated at 12 V, 1 W, manufactured by Micro Commercial Co in a surface mount MELF (DO-213AB) package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The part is RoHS3 compliant and suitable for voltage regulation and protection applications across the operating temperature range of -65°C to 175°C.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	12 V
Tolerance	±5%
Power - Max	1 W
Impedance (Max)	9 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 9.1 V
Voltage - Forward (Vf) (Max)	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

Substitution of the DL4742A-TP is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

Zener voltage: 12 V nominal
Tolerance: ±5%
Maximum power dissipation: 1 W
Maximum impedance: 9 Ohms
Reverse leakage current: 5 µA @ 9.1 V
Forward voltage: 1.2 V @ 200 mA

Mechanical & Environmental Parameters (Must Match):

Mounting type: Surface Mount
Operating temperature range: -65°C to 175°C (minimum)
RoHS3 compliance
Moisture sensitivity level: 1

Package Considerations: Substitutes may utilize different surface mount packages (MELF or SMA) provided all electrical specifications remain within tolerance. Package differences require PCB layout verification.

Two substitute parts meet these criteria: SMAJ4742A-TP (active status, SMA package) and 1N4742AUR/TR (active status, MELF package).

Parameter Comparison

Parameter	DL4742A-TP	SMAJ4742A-TP	1N4742AUR/TR
Manufacturer	Micro Commercial Co	Micro Commercial Co	Microchip Technology
Product Status	Obsolete	Active	Active
Voltage - Zener (Nom)	12 V	12 V	12 V
Tolerance	±5%	±5%	±5%
Power - Max	1 W	1 W	1 W
Impedance (Max)	9 Ohms	9 Ohms	9 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 9.1 V	5 µA @ 9.1 V	5 µA @ 9.1 V
Voltage - Forward (Vf) (Max)	1.2 V @ 200 mA	1.2 V @ 100 mA	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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Not specified

Engineering Selection Recommendations

1N4742AUR/TR (Microchip Technology)

This part is the preferred parametric equivalent for direct replacement of the DL4742A-TP. It maintains identical electrical specifications, operates across the full temperature range (-65°C to 175°C), and utilizes the same MELF package format. The part is currently in active production status with RoHS3 compliance. No PCB layout modifications are required for this substitution.

SMAJ4742A-TP (Micro Commercial Co)

This part provides electrical equivalence with the DL4742A-TP but operates within a reduced temperature range (-65°C to 150°C). The package format differs (DO-214AC SMA versus DO-213AB MELF), requiring PCB layout and footprint modifications. This substitute is suitable for applications where the upper temperature limit of 150°C is acceptable. The part is currently in active production status with RoHS3 compliance.

Both substitutes are RoHS3 compliant and carry REACH Unaffected status, matching the regulatory compliance profile of the original part.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4742A-TP be used as a direct replacement without PCB modifications?

A: No. The SMAJ4742A-TP uses a DO-214AC (SMA) package, while the DL4742A-TP uses a DO-213AB (MELF) package. These packages have different footprints and require PCB layout changes. The 1N4742AUR/TR maintains the MELF package and requires no layout modifications.

Q: What is the temperature limitation of SMAJ4742A-TP compared to the original part?

A: The SMAJ4742A-TP operates from -65°C to 150°C, while the DL4742A-TP operates from -65°C to 175°C. Applications requiring operation above 150°C must use the 1N4742AUR/TR.

Q: Are all three parts RoHS3 compliant?

A: Yes. The DL4742A-TP, SMAJ4742A-TP, and 1N4742AUR/TR are all RoHS3 compliant.

Q: What is the difference in forward voltage specifications between the substitutes?

A: The 1N4742AUR/TR specifies 1.2 V @ 200 mA, matching the original DL4742A-TP. The SMAJ4742A-TP specifies 1.2 V @ 100 mA. Both meet the 1.2 V maximum specification but at different current levels.

Q: Which substitute has the best inventory availability?

A: The SMAJ4742A-TP has 7705 pieces in stock, compared to 1000 pieces for the 1N4742AUR/TR. However, inventory levels are subject to change and should be confirmed with the supplier.

Q: Can I use either substitute interchangeably in my design?

A: Electrical interchangeability is confirmed for both parts. However, package differences and temperature range limitations must be evaluated against your specific application requirements. The 1N4742AUR/TR is the direct replacement requiring no design changes.

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