1N4744AW-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4744AW-TP is a 15 V, 1 W Zener diode manufactured by Micro Commercial Co in SOD-123 surface mount packaging. This component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical performance within the specified voltage, power, and thermal operating parameters while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	15	V
Tolerance	±5	%
Power - Maximum	1	W
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the 1N4744AW-TP are selected based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Electrical Parameters:

Zener voltage: 15 V nominal
Tolerance: ±5%
Maximum power dissipation: 1 W
Operating temperature range: -55°C to 150°C

Mechanical Parameters:

Mounting type: Surface Mount
Package compatibility: SOD-123 or SOD-123F variants

Compliance Requirements:

RoHS3 compliance
Moisture Sensitivity Level 1

All identified substitutes meet these core parameters. Secondary electrical characteristics such as impedance, reverse leakage current, and forward voltage are provided for detailed circuit analysis but do not disqualify substitution eligibility when primary parameters align.

Parameter Comparison

Parameter	1N4744AW-TP	DFLZ15-TP	MM1W15
Manufacturer	Micro Commercial Co	Micro Commercial Co	NextGen Components
Voltage - Zener (Nom)	15 V	15 V	15 V
Tolerance	±5%	±5%	±5%
Power - Max	1 W	1 W	1 W
Impedance (Max)	14 Ohms	10 Ohms	14 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 11.4 V	1 µA @ 1 V	5 µA @ 11 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 10 mA
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C (TJ)	-55°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-123	SOD-123F	SOD-123
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

DFLZ15-TP (Micro Commercial Co)

The DFLZ15-TP is a direct manufacturer substitute from Micro Commercial Co with active product status. This part maintains identical electrical specifications (15 V, 1 W, ±5% tolerance) and operating temperature range. The SOD-123F package is mechanically compatible with SOD-123 footprints in standard surface mount applications. The DFLZ15-TP exhibits improved reverse leakage characteristics (1 µA @ 1 V versus 5 µA @ 11.4 V) and lower impedance (10 Ohms versus 14 Ohms), representing enhanced performance. ROHS3 compliance and unlimited moisture sensitivity rating match the original specification. This substitute is recommended for direct replacement in new production and redesign efforts.

MM1W15 (NextGen Components)

The MM1W15 is a parametric equivalent from NextGen Components with active product status. This part matches all primary electrical parameters (15 V, 1 W, ±5% tolerance) and operating temperature range. The SOD-123 package provides identical mechanical compatibility. Impedance and reverse leakage characteristics are equivalent to the original 1N4744AW-TP. RoHS compliance and unlimited moisture sensitivity rating are maintained. The MM1W15 is suitable for applications requiring cross-manufacturer sourcing or supply chain diversification.

Frequently Asked Questions (FAQ)

Q: Can the DFLZ15-TP replace the 1N4744AW-TP in existing designs?

A: Yes. The DFLZ15-TP maintains identical zener voltage (15 V), power rating (1 W), tolerance (±5%), and operating temperature range (-55°C to 150°C). The SOD-123F package is mechanically compatible with SOD-123 footprints. Both parts are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between SOD-123 and SOD-123F packages?

A: SOD-123F is a variant of the SOD-123 package. Both are surface mount packages with compatible footprints for standard PCB applications. The DFLZ15-TP uses SOD-123F packaging while the 1N4744AW-TP and MM1W15 use SOD-123.

Q: Are there differences in electrical performance between the substitutes?

A: The DFLZ15-TP exhibits lower impedance (10 Ohms versus 14 Ohms) and improved reverse leakage characteristics (1 µA @ 1 V). The MM1W15 matches the original impedance and reverse leakage specifications. All three parts meet the 15 V, 1 W, ±5% tolerance requirements and are suitable for equivalent circuit operation.

Q: Why is the 1N4744AW-TP classified as obsolete?

A: The 1N4744AW-TP is no longer in active production. The DFLZ15-TP and MM1W15 are active alternatives that provide equivalent or improved electrical performance with current manufacturing support and compliance certifications.

Q: Do all substitutes meet RoHS compliance requirements?

A: Yes. The DFLZ15-TP is ROHS3 compliant. The MM1W15 is RoHS compliant. Both meet environmental and regulatory requirements for current manufacturing standards.

Q: Can the MM1W15 be used interchangeably with the DFLZ15-TP?

A: Yes. Both parts meet identical primary electrical specifications (15 V, 1 W, ±5% tolerance, -55°C to 150°C operating range) and surface mount requirements. The MM1W15 uses SOD-123 packaging while the DFLZ15-TP uses SOD-123F, but both are compatible with standard SOD-123 footprints. Selection between these two substitutes depends on supply availability and manufacturer preference.

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