1N4746A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4746A-TP is an 18 V, 1 W Zener diode manufactured by Micro Commercial Co in a DO-41G through-hole axial package. This component is classified as obsolete, though 792 pieces remain in stock as new original inventory. The part operates across a temperature range of -65°C to 200°C and maintains ±5% voltage tolerance with a maximum impedance of 20 Ohms. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	18	V
Power - Maximum	1	W
Tolerance	±5	%
Impedance (Maximum)	20	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 13.7 V
Voltage - Forward (Maximum) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65 to 200	°C
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial

Substitute Part Grouping Explanation

Substitution of the 1N4746A-TP is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nominal): 18 V
Power - Maximum: 1 W
Tolerance: ±5%
Impedance (Maximum): 20 Ohms
Current - Reverse Leakage @ Vr: 5 µA @ 13.7 V
Voltage - Forward (Maximum) @ If: 1.2 V @ 200 mA
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial

Secondary Considerations:

Operating Temperature Range: Minimum -65°C to maximum 200°C (or equivalent)
RoHS Compliance Status
Product Status (Active preferred for long-term availability)

Substitute parts are grouped into three categories:

Direct Equivalents (Active Status): Parts with identical electrical parameters and active product status from established manufacturers.
Parametric Equivalents: Parts meeting all electrical specifications but with variations in packaging format or temperature range within acceptable limits.
Functional Alternatives: Parts with different power ratings or package types that may serve similar circuit functions but require design verification.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (W)	Tolerance (%)	Zzt (Ohms)	Temp Range (°C)	Package	Status	RoHS
1N4746A-TP	Micro Commercial Co	18	1	±5	20	-65 to 200	DO-41G	Obsolete	ROHS3
1N4746AP-TP	Micro Commercial Co	18	1	±5	20	-65 to 150	DO-41	Active	ROHS3
1N4746A-T50A	onsemi	18	1	±5	20	-65 to 200	DO-41	Active	ROHS3
1N4746AP/TR8	Microchip Technology	18	1	±5	20	-65 to 150	DO-204AL	Active	Non-compliant
1N4746A	Microchip Technology	18	1	±5	20	-65 to 200	DO-204AL	Active	Non-compliant
1N4746AGE3	Microchip Technology	18	1	±5	20	-65 to 175	DO-41	Active	ROHS3
1N4746A TR PBFREE	Central Semiconductor Corp	18	1	±5	20	-65 to 200	DO-41	Active	ROHS3
1N4746A,113	Nexperia USA Inc.	18	1	±5	20	-65 to 200	DO-41	Active	ROHS3
1N5073	Microchip Technology	18	3	±5	8	-65 to 175	Axial	Active	Not specified
1N5248BTR	Fairchild Semiconductor	18	0.5	±5	21	-65 to 200	DO-35	Active	Not specified

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Recommended for Primary Selection):

1N4746A-T50A (onsemi): Provides full electrical equivalence with identical temperature range (-65°C to 200°C) and ROHS3 compliance. Active product status ensures long-term availability. Cut tape packaging supports automated assembly.
1N4746A,113 (Nexperia USA Inc.): Meets all electrical specifications with full temperature range coverage and ROHS3 compliance. Highest inventory availability (125,300 pieces) provides supply security. Cut tape packaging suitable for production environments.
1N4746A TR PBFREE (Central Semiconductor Corp): Delivers complete parametric equivalence with -65°C to 200°C operating range and ROHS3 compliance. Lead-free formulation supports environmental requirements. Adequate inventory (5,314 pieces) for sustained procurement.

Tier 2 - Acceptable Substitutes (Limited Temperature Range):

1N4746AP-TP (Micro Commercial Co): Maintains electrical equivalence but operates to 150°C maximum. Suitable for applications not requiring full 200°C upper temperature limit. Active status and ROHS3 compliance confirmed.
1N4746AP/TR8 (Microchip Technology): Provides electrical equivalence with 150°C maximum operating temperature. RoHS non-compliance requires evaluation against procurement standards. Tape & reel packaging supports high-volume assembly.
1N4746AGE3 (Microchip Technology): Meets electrical specifications with 175°C maximum operating temperature. ROHS3 compliant. Bulk packaging format requires manual handling.

Tier 3 - Functional Alternatives (Design Verification Required):

1N5073 (Microchip Technology): Maintains 18 V zener voltage and ±5% tolerance but increases power rating to 3 W with reduced impedance (8 Ohms). Suitable for applications requiring higher power dissipation. Axial package format differs from original. Temperature range limited to 175°C.
1N5248BTR (Fairchild Semiconductor): Maintains 18 V zener voltage and ±5% tolerance but reduces power rating to 500 mW. Impedance increases to 21 Ohms. DO-35 package differs from original DO-41. Suitable only for lower-power circuit implementations.

Frequently Asked Questions (FAQ)

Q: Can 1N4746AP-TP substitute for 1N4746A-TP in all applications?

A: 1N4746AP-TP provides electrical equivalence but operates to 150°C maximum versus 200°C for the original part. Substitution is valid for applications where the maximum operating temperature does not exceed 150°C. Verify circuit thermal requirements before selection.

Q: What is the difference between DO-41 and DO-204AL packages?

A: Both designations refer to the same axial through-hole package format. DO-41 is the industry standard designation, while DO-204AL is the formal JEDEC classification. Parts specified with either designation are mechanically and electrically interchangeable.

Q: Why is 1N4746A,113 preferred over other substitutes?

A: 1N4746A,113 from Nexperia USA Inc. combines full electrical equivalence, complete temperature range coverage (-65°C to 200°C), ROHS3 compliance, and the highest inventory availability (125,300 pieces). These factors ensure design compatibility and long-term supply continuity.

Q: Can 1N5073 replace 1N4746A-TP in existing designs?

A: 1N5073 maintains the 18 V zener voltage specification but increases power rating to 3 W and changes package format to axial. This part functions as a higher-power alternative suitable only for redesigned circuits requiring increased power dissipation. Direct substitution in existing layouts is not recommended.

Q: What does ROHS3 compliance indicate?

A: ROHS3 compliance certifies that the component meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. ROHS3 compliant parts are required for many industrial and consumer applications subject to environmental regulations.

Q: Is the 1N4746A TR PBFREE suitable for high-reliability applications?

A: 1N4746A TR PBFREE from Central Semiconductor Corp meets all electrical specifications with ROHS3 compliance and full temperature range coverage. Lead-free formulation supports environmental standards. Suitability for high-reliability applications depends on specific qualification requirements and procurement standards of the end application.

Q: How do impedance differences affect circuit performance?

A: Maximum impedance (Zzt) values of 20 Ohms for primary substitutes and 21 Ohms for 1N5248BTR are within acceptable tolerance for most voltage regulation circuits. The 8 Ohms impedance of 1N5073 indicates lower dynamic resistance, affecting voltage regulation characteristics. Impedance differences require circuit analysis for applications with strict regulation requirements.

Q: What packaging formats are available for 1N4746A equivalents?

A: Available packaging formats include Cut Tape (CT), Tape & Reel (TR), and Bulk. Cut tape and tape & reel formats support automated assembly processes. Bulk packaging requires manual component handling. Selection depends on production volume and assembly methodology.

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