1N4744A-T Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4744A-T is a 15 V, 1 W Zener diode manufactured by Diodes Incorporated in DO-41 axial through-hole packaging. This component is classified as obsolete, with 5200 units currently in stock. The part operates across a temperature range of -65°C to 175°C and maintains ±5% voltage tolerance with a maximum impedance of 14 Ohms.

Due to the obsolete status of the 1N4744A-T, equivalent and substitute parts from active manufacturers are necessary to ensure continued design support, procurement reliability, and long-term component availability. Substitute parts maintain identical electrical specifications while offering active product status from alternative manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	15	V
Power - Maximum	1	W
Tolerance	±5	%
Impedance (Maximum)	14	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 11.4 V
Voltage - Forward (Maximum) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial

Substitute Part Grouping Explanation

Substitution of the 1N4744A-T is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Voltage - Zener (Nominal): 15 V
Power - Maximum: 1 W
Tolerance: ±5%
Impedance (Maximum): 14 Ohms
Current - Reverse Leakage @ Vr: 5 µA @ 11.4 V
Voltage - Forward (Maximum) @ If: 1.2 V @ 200 mA

Mechanical Equivalence Criteria:

Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, Axial

Substitution Categories:

Direct Equivalents (1 W, 15 V): Parts maintaining identical 1 W power rating and 15 V zener voltage with active product status. These include 1N4744A,113 (Nexperia), 1N4744AP/TR8 (Microchip), 1N4744A (Microchip), 1N4744A,133 (NXP), 1N4744A-T50A (onsemi), 1N4744A-T50R (Fairchild), and 1N4744ATR (onsemi).

Higher Power Alternatives: Parts with identical 15 V zener voltage but increased power dissipation capability. These include 1N5929B3P-TP (3 W) and 1N5352BRLG (5 W), suitable for applications requiring enhanced thermal performance.

Lower Power Alternative: 1N5245B (500 mW) provides reduced power dissipation in a different package (DO-35), applicable to circuits with lower power requirements.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (W)	Tolerance (%)	Zzt (Ohms)	Reverse Leakage (µA @ V)	Vf Max (V @ mA)	Temp Range (°C)	Package	Status
1N4744A-T	Diodes Inc.	15	1	±5	14	5 @ 11.4	1.2 @ 200	-65 to 175	DO-41	Obsolete
1N4744A,113	Nexperia	15	1	±5	14	5 @ 11.4	1.2 @ 200	-65 to 200	DO-41	Active
1N4744AP/TR8	Microchip	15	1	±5	14	5 @ 11.4	1.2 @ 200	-65 to 150	DO-204AL	Active
1N4744A	Microchip	15	1	±5	14	5 @ 11.4	1.2 @ 200	-65 to 175	DO-204AL	Discontinued
1N4744A,133	NXP	15	1	±5	14	5 @ 11.4	1.2 @ 200	-65 to 200	DO-41	Active
1N4744A-T50A	onsemi	15	1	±5	14	5 @ 11.4	Not specified	-65 to 200	DO-41	Active
1N4744A-T50R	Fairchild	15	1	±5	14	5 @ 11.4	Not specified	-65 to 200	DO-41	Active
1N4744ATR	onsemi	15	1	±5	14	5 @ 11.4	Not specified	-65 to 200	DO-41	Active
1N5929B3P-TP	Micro Commercial Co	15	3	±5	9	1 @ 11.4	1.5 @ 200	-55 to 150	DO-41	Active
1N5352BRLG	onsemi	15	5	±5	2.5	1 @ 11.5	1.2 @ 1000	-65 to 200	Axial	Active
1N5245B	Microchip	15	0.5	±5	16	0.1 @ 11	1.5 @ 200	-65 to 175	DO-35	Active

Engineering Selection Recommendations

Primary Direct Substitutes (Recommended for 1:1 Replacement):

The following parts provide direct electrical and mechanical equivalence to the 1N4744A-T with active product status:

1N4744A,113 (Nexperia USA Inc.) - Active status with extended operating temperature to 200°C and ROHS3 compliance. Cut Tape packaging with 44,269 units in stock.

1N4744A,133 (NXP Semiconductors) - Active status with extended operating temperature to 200°C. Bulk packaging with 26,007 units in stock.

1N4744ATR (onsemi) - Active status with extended operating temperature to 200°C and ROHS3 compliance. Cut Tape packaging with 5,272 units in stock.

1N4744A-T50A (onsemi) - Active status with extended operating temperature to 200°C and ROHS3 compliance. Cut Tape packaging with 6,269 units in stock.

Secondary Direct Substitutes (Alternative Packaging):

1N4744AP/TR8 (Microchip Technology) - Active status in Tape & Reel packaging. Operating temperature limited to 150°C. RoHS non-compliant. 742 units in stock.

1N4744A-T50R (Fairchild Semiconductor) - Active status with extended operating temperature to 200°C. Bulk packaging with 14,550 units in stock. RoHS status not applicable.

Higher Power Alternatives (For Enhanced Thermal Performance):

1N5929B3P-TP (Micro Commercial Co) - 3 W power rating with identical 15 V zener voltage. Maintains DO-41 package compatibility. Operating temperature range -55°C to 150°C. 1,050 units in stock.

1N5352BRLG (onsemi) - 5 W power rating with identical 15 V zener voltage. Axial package with ROHS3 compliance. Extended operating temperature to 200°C. 40,200 units in stock.

Lower Power Alternative (For Reduced Power Dissipation):

1N5245B (Microchip Technology) - 500 mW power rating with identical 15 V zener voltage. DO-35 package (different from DO-41). Operating temperature -65°C to 175°C. 1,375 units in stock.

Compliance Considerations:

For applications requiring ROHS3 compliance, select from: 1N4744A,113, 1N4744A-T50A, 1N4744ATR, or 1N5352BRLG.

For applications requiring REACH compliance, all listed substitutes are REACH Unaffected except 1N4744A,113 which is REACH Affected.

For extended operating temperature requirements beyond 175°C, select parts rated to 200°C: 1N4744A,113, 1N4744A,133, 1N4744A-T50A, 1N4744A-T50R, 1N4744ATR, or 1N5352BRLG.

Frequently Asked Questions (FAQ)

Q: Can 1N4744A,113 directly replace 1N4744A-T in existing designs?

A: Yes. The 1N4744A,113 maintains identical electrical specifications (15 V, 1 W, ±5% tolerance, 14 Ohms impedance) and mechanical compatibility (DO-41 through-hole package). The extended operating temperature range (-65°C to 200°C versus -65°C to 175°C) provides additional thermal margin. Active product status ensures long-term availability.

Q: What is the difference between 1N4744A,113 and 1N4744ATR?

A: Both parts are electrically identical 15 V, 1 W Zener diodes from different manufacturers (Nexperia and onsemi respectively). Primary differences are packaging format (Cut Tape for both) and inventory levels. Both are ROHS3 compliant and rated to 200°C. Selection between these parts depends on supplier availability and procurement preferences.

Q: Can I use 1N5929B3P-TP as a substitute for 1N4744A-T?

A: Yes, with design considerations. The 1N5929B3P-TP maintains the identical 15 V zener voltage and ±5% tolerance but provides 3 W power dissipation versus 1 W. This higher power rating is suitable for applications requiring enhanced thermal performance. The DO-41 package is mechanically compatible. Operating temperature range is -55°C to 150°C, which is narrower than the original part. Lower impedance (9 Ohms versus 14 Ohms) and reduced reverse leakage (1 µA versus 5 µA) provide improved performance characteristics.

Q: Why would I select 1N5352BRLG over direct 1 W equivalents?

A: The 1N5352BRLG provides 5 W power dissipation with identical 15 V zener voltage. Selection is appropriate for circuits requiring higher power handling, improved thermal stability, or reduced impedance (2.5 Ohms). The axial package differs from DO-41, requiring board layout modification. Extended operating temperature to 200°C and ROHS3 compliance support modern design requirements.

Q: Is 1N5245B a suitable substitute for 1N4744A-T?

A: The 1N5245B maintains the identical 15 V zener voltage and ±5% tolerance but provides only 500 mW power dissipation versus 1 W. This lower power rating is suitable only for circuits with reduced power requirements. The DO-35 package differs from DO-41, requiring board layout modification. Selection is appropriate when thermal constraints or circuit design specifically require lower power dissipation.

Q: What packaging options are available for 1N4744A-T substitutes?

A: Direct 1 W equivalents are available in DO-41 axial through-hole package (1N4744A,113, 1N4744A,133, 1N4744ATR, 1N4744A-T50A, 1N4744A-T50R) and DO-204AL package (1N4744AP/TR8, 1N4744A). Higher power alternatives use T-18 axial package (1N5352BRLG). Lower power alternative uses DO-35 package (1N5245B). All are through-hole mounting types suitable for manual or automated assembly.

Q: Which substitute offers the best long-term availability?

A: 1N5352BRLG (onsemi) demonstrates the highest inventory level at 40,200 units in stock with active product status. Among direct 1 W equivalents, 1N4744A,113 (Nexperia) offers 44,269 units in stock. Both parts are ROHS3 compliant and rated to 200°C, supporting long-term design support and procurement reliability.

Q: Are there RoHS compliance differences between substitutes?

A: Yes. Direct equivalents 1N4744A,113, 1N4744A-T50A, 1N4744ATR, and higher power alternative 1N5352BRLG are ROHS3 compliant. Parts 1N4744AP/TR8 and 1N4744A are RoHS non-compliant. Part 1N4744A-T50R has RoHS status not applicable. Part 1N5245B is RoHS non-compliant. For applications requiring ROHS3 certification, select from the compliant options.

Q: What is the significance of impedance differences between substitutes?

A: Impedance (Zzt) affects voltage regulation performance under load changes. The original 1N4744A-T specifies 14 Ohms maximum impedance. Direct 1 W equivalents maintain this specification. The 1N5929B3P-TP provides lower impedance at 9 Ohms, improving voltage regulation. The 1N5352BRLG provides significantly lower impedance at 2.5 Ohms, suitable for applications requiring superior voltage stability. The 1N5245B specifies 16 Ohms, slightly higher impedance. Selection depends on circuit voltage regulation requirements.

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