1N4748A-T Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4748A-T is a 22 V, 1 W zener diode in DO-41 through-hole package manufactured by Diodes Incorporated. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design support and procurement. The 1N4748A-T serves voltage regulation and protection functions in electronic circuits requiring stable 22 V reference voltage with 1 W power dissipation capability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	22	V
Tolerance	±5%	%
Power - Max	1	W
Impedance (Max)	23	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 16.7 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65°C ~ 175°C	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—

Substitute Part Grouping Explanation

Substitution of the 1N4748A-T is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 22 V nominal
Tolerance: ±5%
Power rating: 1 W (minimum)
Impedance: 23 Ohms (maximum)
Reverse leakage current: 5 µA @ 16.7 V (maximum)
Forward voltage: 1.2 V @ 200 mA (maximum)
Package type: DO-41 through-hole axial configuration

Substitution Categories:

Direct Equivalents maintain all electrical parameters and 1 W power rating with active product status and improved temperature ranges or compliance certifications.

Upgrade Equivalents provide identical electrical specifications with enhanced features such as extended operating temperature ranges (-65°C to 200°C) or improved RoHS compliance while maintaining 1 W power rating.

Higher Power Alternatives exceed the 1 W specification (1.5 W or 3 W) and are suitable for applications requiring additional thermal margin or higher current handling, though they occupy the same physical package.

Lower Power Alternatives provide 500 mW rating and are suitable only for applications with reduced power dissipation requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Ir @ Vr (µA)	Vf @ If (V)	Temp Range (°C)	Product Status	Package
1N4748A-T	Diodes Incorporated	22	±5%	1	23	5 @ 16.7	1.2 @ 200 mA	-65 ~ 175	Obsolete	DO-41
1N4748A,113	Nexperia USA Inc.	22	±5%	1	23	5 @ 16.7	1.2 @ 200 mA	-65 ~ 200	Active	DO-41
1N4748AP/TR8	Microchip Technology	22	±5%	1	23	5 @ 16.7	1.2 @ 200 mA	-65 ~ 150	Active	DO-41
1N4748A	Lumimax Optoelectronic Technology	22	±5%	1	23	5 @ 16.7	1.2 @ 200 mA	-65 ~ 200	Active	DO-41
1N4748A,133	NXP USA Inc.	22	±5%	1	23	5 @ 16.7	1.2 @ 200 mA	-65 ~ 200	Active	DO-41
1N4748A-T50A	onsemi	22	±5%	1	23	5 @ 16.7	—	-65 ~ 200	Active	DO-41
1N4748ATR	onsemi	22	±5%	1	23	5 @ 16.7	—	-65 ~ 200	Active	DO-41
1N4748AGE3	Microchip Technology	22	±5%	1	23	5 @ 16.7	1.2 @ 200 mA	-65 ~ 175	Active	DO-41
1EZ22D5-TP	Micro Commercial Co	22	±5%	0.5	23	5 @ 16.7	1.2 @ 200 mA	-55 ~ 150	Active	DO-41
1N5933B3P-TP	Micro Commercial Co	22	±5%	3	17.5	1 @ 16.7	1.5 @ 200 mA	-55 ~ 150	Active	DO-41
1N5933BP-TP	Micro Commercial Co	22	±5%	1.5	17.5	1 @ 16.7	1.5 @ 200 mA	-55 ~ 175	Active	DO-41

Engineering Selection Recommendations

Direct Equivalent Selection (1 W, 22 V, ±5%)

For applications requiring exact electrical parameter matching with the 1N4748A-T, the following active alternatives are available:

1N4748A,113 (Nexperia USA Inc.) provides direct equivalence with extended operating temperature range to 200°C and active product status. This part is suitable for designs requiring long-term component availability and improved thermal performance.

1N4748A (Lumimax Optoelectronic Technology) offers identical electrical specifications with active status and 200°C maximum operating temperature. High inventory availability (10,645 units) supports production requirements.

1N4748A,133 (NXP USA Inc.) delivers full parameter equivalence with active status and 200°C operating range. Largest available inventory (50,096 units) ensures supply chain continuity.

1N4748A-T50A (onsemi) and 1N4748ATR (onsemi) maintain complete electrical equivalence with active status and 200°C operating temperature. Both parts carry ROHS3 compliance certification.

1N4748AGE3 (Microchip Technology) provides electrical equivalence with ROHS3 compliance and active product status, though operating temperature range is limited to 175°C.

1N4748AP/TR8 (Microchip Technology) offers electrical equivalence with active status but operates to 150°C maximum temperature. RoHS compliance status differs from primary alternatives.

Higher Power Alternatives (1.5 W or 3 W, 22 V, ±5%)

1N5933BP-TP (Micro Commercial Co) provides 1.5 W power rating with identical 22 V zener voltage and ±5% tolerance. Impedance is reduced to 17.5 Ohms, and reverse leakage current is 1 µA @ 16.7 V. Operating temperature range extends to 175°C. This part is suitable for applications requiring thermal margin beyond 1 W specification.

1N5933B3P-TP (Micro Commercial Co) provides 3 W power rating with 22 V zener voltage and ±5% tolerance. Impedance is 17.5 Ohms with 1 µA reverse leakage current. Operating temperature range is -55°C to 150°C. This part is suitable for high-power voltage regulation applications.

Lower Power Alternative (500 mW, 22 V, ±5%)

1EZ22D5-TP (Micro Commercial Co) provides 500 mW power rating with 22 V zener voltage and ±5% tolerance. Electrical parameters match the primary part except for reduced power dissipation capability. Operating temperature range is -55°C to 150°C. This part is suitable only for applications with power dissipation below 500 mW.

Compliance and Certification Considerations

Parts carrying ROHS3 compliance (1N4748A-T50A, 1N4748ATR, 1N4748AGE3, 1N4748A,113) are preferred for applications subject to RoHS directive requirements. The 1N4748AP/TR8 is RoHS non-compliant and should be avoided in regulated applications.

All listed parts carry EAR99 export classification and HTSUS code 8541.10.0050, indicating standard commercial zener diode classification.

Frequently Asked Questions (FAQ)

Q: Can 1N4748A,113 directly replace 1N4748A-T in existing designs?

A: Yes. The 1N4748A,113 maintains identical electrical specifications: 22 V zener voltage, ±5% tolerance, 1 W power rating, 23 Ohms impedance, and 5 µA reverse leakage current. The extended operating temperature range (-65°C to 200°C) provides improved thermal performance. Both parts use DO-41 through-hole package configuration.

Q: What is the difference between 1N4748A-T50A and 1N4748ATR?

A: Both parts are manufactured by onsemi and maintain identical electrical specifications. The primary difference is packaging: 1N4748A-T50A uses Tape & Box (TB) packaging, while 1N4748ATR uses Cut Tape (CT) packaging. Electrical performance and operating temperature range (-65°C to 200°C) are identical. Selection depends on procurement and assembly requirements.

Q: When should 1N5933BP-TP be selected instead of 1N4748A,113?

A: The 1N5933BP-TP provides 1.5 W power rating compared to 1 W for 1N4748A,113. Selection of the higher power part is appropriate when circuit analysis indicates power dissipation approaching or exceeding 1 W, or when thermal margin is required for reliability. Both parts maintain 22 V zener voltage and ±5% tolerance. The 1N5933BP-TP impedance is 17.5 Ohms versus 23 Ohms for the 1N4748A,113.

Q: Is 1EZ22D5-TP suitable as a replacement for 1N4748A-T?

A: The 1EZ22D5-TP is suitable only for applications with power dissipation below 500 mW. This part provides 500 mW maximum power rating compared to 1 W for the 1N4748A-T. Zener voltage (22 V), tolerance (±5%), and impedance (23 Ohms) are identical. Operating temperature range is reduced to -55°C to 150°C. Use this part only when circuit power requirements are confirmed below 500 mW.

Q: What compliance certifications are important for component selection?

A: RoHS3 compliance is required for applications subject to RoHS directive. Parts carrying ROHS3 certification include 1N4748A-T50A, 1N4748ATR, 1N4748AGE3, and 1N4748A,113. The 1N4748AP/TR8 is RoHS non-compliant and should not be used in regulated applications. All parts carry EAR99 export classification, indicating standard commercial status.

Q: How do operating temperature ranges affect part selection?

A: The 1N4748A-T operates from -65°C to 175°C. Several alternatives extend the upper limit to 200°C (1N4748A,113; 1N4748A; 1N4748A,133; 1N4748A-T50A; 1N4748ATR), providing improved thermal margin. The 1N4748AP/TR8 and 1N4748AGE3 are limited to 150°C and 175°C respectively. Lower power alternatives (1EZ22D5-TP) and higher power alternatives (1N5933B3P-TP, 1N5933BP-TP) operate to 150°C maximum. Selection depends on circuit operating environment and thermal design requirements.

Q: Are all substitute parts available in the same DO-41 package?

A: Yes. All listed substitute parts use DO-41 through-hole axial package configuration, also designated as DO-204AL. Physical dimensions and lead spacing are identical, enabling direct mechanical substitution in existing printed circuit board designs without layout modification.

Q: What inventory considerations apply to part selection?

A: Inventory availability varies significantly among alternatives. The 1N4748A,133 (NXP USA Inc.) provides the largest inventory at 50,096 units. The 1N4748A (Lumimax) offers 10,645 units. The 1N4748ATR (onsemi) provides 21,963 units. Smaller inventories are available for specialized variants. Procurement strategy should consider both immediate availability and long-term supply continuity.

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