1N4738A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4738A-TP is a through-hole zener diode rated at 8.2 V nominal voltage with 1 W maximum power dissipation, manufactured by Micro Commercial Co in the DO-41G package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design and procurement requirements. The electrical and mechanical specifications of this diode establish the baseline criteria for determining compatible alternatives across multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	8.2	V
Tolerance	±5%	%
Power - Max	1	W
Impedance (Max)	4.5	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 6 V
Voltage - Forward (Vf) (Max) @ 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 1N4738A-TP is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Voltage - Zener (Nom): 8.2 V
Tolerance: ±5%
Power - Max: 1 W
Impedance (Max): 4.5 Ohms
Current - Reverse Leakage @ Vr: 10 µA @ 6 V
Voltage - Forward (Vf) (Max) @ If: 1.2 V @ 200 mA

Mechanical Equivalence Criteria:

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

Operating Condition Criteria:

Operating Temperature Range: -65°C to 200°C (primary specification); -65°C to 150°C (acceptable for most applications with reduced upper temperature margin)

All substitute parts listed maintain identical electrical specifications. Variations in operating temperature range, packaging format (Tape & Reel, Cut Tape, Bulk, Tape & Box), and manufacturer do not affect functional equivalence when the above parameters are matched.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Vf @ If (V @ mA)	Temp Range (°C)	Package	Product Status
1N4738A-TP	Micro Commercial Co	8.2	±5%	1	4.5	1.2 @ 200	-65 to 200	DO-41G	Obsolete
1N4738AP-TP	Micro Commercial Co	8.2	±5%	1	4.5	1.2 @ 200	-65 to 150	DO-41	Active
1N4738A	Lumimax Optoelectronic Technology	8.2	±5%	1	4.5	1.2 @ 200	-65 to 200	DO-41G	Active
1N4738A,133	NXP Semiconductors	8.2	±5%	1	4.5	1.2 @ 200	-65 to 200	DO-41	Active
1N4738A-T50A	onsemi	8.2	±5%	1	4.5	Not specified	-65 to 200	DO-41	Active
1N4738AP/TR8	Microchip Technology	8.2	±5%	1	4.5	1.2 @ 200	-65 to 150	DO-204AL (DO-41)	Active
1N4738A TR PBFREE	Central Semiconductor Corp	8.2	±5%	1	4.5	1.2 @ 200	-65 to 200	DO-41	Active
1N4738A,113	Nexperia USA Inc.	8.2	±5%	1	4.5	1.2 @ 200	-65 to 200	DO-41	Active
1N4738A-T50R	Fairchild Semiconductor	8.2	±5%	1	4.5	Not specified	-65 to 200	DO-204AL (DO-41)	Active
1N4738ATR	Fairchild Semiconductor	8.2	±5%	1	4.5	Not specified	-65 to 200	DO-204AL (DO-41)	Active
1N4738G	Taiwan Semiconductor Corporation	8.2	±5%	1	4.5	1.2 @ 200	-65 to 200	DO-204AL (DO-41)	Active

Engineering Selection Recommendations

Primary Substitutes (Full Specification Match with Extended Temperature Range):

The following parts maintain complete electrical and mechanical equivalence with the original 1N4738A-TP and support the full operating temperature range of -65°C to 200°C:

1N4738A (Lumimax Optoelectronic Technology): Active status, 10,110 units in stock, Tape & Box packaging, RoHS Compliant
1N4738A,133 (NXP Semiconductors): Active status, 134,082 units in stock, Bulk packaging, RoHS Compliant
1N4738A-T50A (onsemi): Active status, 989 units in stock, Tape & Box packaging, ROHS3 Compliant
1N4738A TR PBFREE (Central Semiconductor Corp): Active status, 5,740 units in stock, Cut Tape packaging, ROHS3 Compliant
1N4738A,113 (Nexperia USA Inc.): Active status, 16,190 units in stock, Cut Tape packaging, ROHS3 Compliant
1N4738A-T50R (Fairchild Semiconductor): Active status, 16,129 units in stock, Bulk packaging
1N4738ATR (Fairchild Semiconductor): Active status, 14,080 units in stock, Bulk packaging
1N4738G (Taiwan Semiconductor Corporation): Active status, 825 units in stock, Tape & Reel packaging, ROHS3 Compliant

Secondary Substitutes (Reduced Upper Temperature Limit):

The following parts are electrically equivalent but specify a maximum operating temperature of 150°C instead of 200°C:

1N4738AP-TP (Micro Commercial Co): Active status, 700 units in stock, Tape & Reel packaging, ROHS3 Compliant
1N4738AP/TR8 (Microchip Technology): Active status, 1,030 units in stock, Tape & Reel packaging

These secondary substitutes are suitable for applications where the operating temperature does not exceed 150°C.

Compliance Considerations:

All listed substitutes maintain REACH Unaffected status and EAR99 export classification. RoHS compliance varies by manufacturer; designs requiring ROHS3 Compliant certification should prioritize parts explicitly marked as such.

Frequently Asked Questions (FAQ)

Q: Can I use 1N4738AP-TP as a direct replacement for 1N4738A-TP?

A: The 1N4738AP-TP is electrically equivalent but specifies a maximum operating temperature of 150°C compared to the original 200°C specification. It is suitable for replacement in applications where the junction temperature remains below 150°C. Verify your thermal design to confirm this constraint is met.

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

A: DO-41 and DO-204AL are equivalent designations for the same axial through-hole package. Both refer to the same physical form factor and pin configuration. Parts specified as DO-204AL (DO-41) or DO-41G are mechanically interchangeable.

Q: Are all substitute parts RoHS compliant?

A: RoHS compliance status varies by manufacturer and part number. Parts explicitly marked as ROHS3 Compliant or RoHS Compliant meet the directive requirements. The 1N4738AP/TR8 from Microchip Technology is marked as RoHS non-compliant. Verify compliance requirements for your application and select accordingly.

Q: What is the significance of different packaging formats (Tape & Reel, Cut Tape, Bulk)?

A: Packaging format affects procurement and assembly processes but does not alter electrical or mechanical performance. Tape & Reel (TR) and Cut Tape (CT) formats are suitable for automated assembly. Bulk packaging is used for manual assembly or reel consolidation. Select based on your manufacturing process requirements.

Q: Can I substitute a part with a lower maximum operating temperature?

A: Substitution with a lower maximum operating temperature is permissible only if your circuit design ensures the component junction temperature remains within the specified limit. Perform thermal analysis to confirm the component will not exceed 150°C in your application before using secondary substitutes.

Q: Are there any electrical performance differences between manufacturers?

A: All listed substitutes maintain identical electrical specifications: 8.2 V nominal zener voltage, ±5% tolerance, 1 W maximum power, 4.5 Ohms maximum impedance, and 10 µA reverse leakage current at 6 V. Electrical performance is equivalent across all manufacturers.

Q: What inventory levels should I consider for procurement?

A: Inventory availability varies significantly. NXP Semiconductors (1N4738A,133) offers the highest stock level at 134,082 units. Lumimax (1N4738A) provides 10,110 units. Fairchild Semiconductor parts (1N4738A-T50R and 1N4738ATR) each offer approximately 14,000-16,000 units. Select based on your procurement timeline and volume requirements.

Q: Is the 1N4738G from Taiwan Semiconductor Corporation a suitable substitute?

A: Yes, the 1N4738G is fully equivalent electrically and mechanically, supporting the full -65°C to 200°C operating range. It is available in Tape & Reel packaging with 825 units in stock and carries ROHS3 Compliant certification.

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