1N4735A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4735A-TP is a 6.2 V, 1 W Zener diode manufactured by Micro Commercial Co in a through-hole DO-41G package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 1N4735A-TP serves voltage regulation and protection applications requiring a nominal Zener voltage of 6.2 V with ±5% tolerance and 1 W maximum power dissipation. Substitute parts must maintain identical electrical characteristics and mechanical compatibility to ensure direct replacement in existing circuit designs.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	6.2	V
Tolerance	±5%	%
Power - Max	1	W
Impedance (Max)	2	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 3 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

Substitute parts for the 1N4735A-TP are classified based on electrical parameter equivalence and product status. All substitute parts maintain the following critical parameters:

Electrical Equivalence Criteria:

Voltage - Zener (Nom): 6.2 V
Tolerance: ±5%
Power - Max: 1 W
Impedance (Max): 2 Ohms
Current - Reverse Leakage @ Vr: 10 µA @ 3 V
Voltage - Forward (Vf) (Max) @ If: 1.2 V @ 200 mA
Operating Temperature Range: -65°C to 200°C (or -65°C to 150°C for limited-range variants)
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, Axial

Substitution Categories:

Direct Manufacturer Equivalents maintain full electrical and mechanical compatibility with identical specifications across all parameters.

Similar Manufacturer Parts provide electrical equivalence with minor variations in operating temperature range or packaging format (tape & reel versus cut tape).

Parametric Equivalents deliver identical electrical performance and are suitable for direct circuit replacement.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance (%)	Power (W)	Zzt (Ohms)	Vf @ If (V @ mA)	Temp Range (°C)	Package	Product Status	RoHS Status
1N4735A-TP	Micro Commercial Co	6.2	±5	1	2	1.2 @ 200	-65 to 200	DO-41G	Obsolete	ROHS3 Compliant
1N4735A	Lumimax Optoelectronic Technology	6.2	±5	1	2	1.2 @ 200	-65 to 200	DO-41G	Active	RoHS Compliant
1N4735A,133	Nexperia USA Inc.	6.2	±5	1	2	1.2 @ 200	-65 to 200	DO-41	Active	ROHS3 Compliant
1N4735A-T50A	Fairchild Semiconductor	6.2	±5	1	2	Not Specified	-65 to 200	DO-204AL (DO-41)	Active	Not Specified
1N4735AP/TR12	Microchip Technology	6.2	±5	1	2	1.2 @ 200	-65 to 150	DO-204AL (DO-41)	Active	RoHS non-compliant
1N4735AP/TR8	Microchip Technology	6.2	±5	1	2	1.2 @ 200	-65 to 150	DO-204AL (DO-41)	Active	ROHS3 Compliant
1N4735A TR PBFREE	Central Semiconductor Corp	6.2	±5	1	2	1.2 @ 200	-65 to 200	DO-41	Active	ROHS3 Compliant
1N4735A,113	Nexperia USA Inc.	6.2	±5	1	2	1.2 @ 200	-65 to 200	DO-41	Active	ROHS3 Compliant
1N4735A-T50R	onsemi	6.2	±5	1	2	Not Specified	-65 to 200	DO-41	Obsolete	ROHS3 Compliant
1N4735ATR	onsemi	6.2	±5	1	2	Not Specified	-65 to 200	DO-41	Active	ROHS3 Compliant
1N4735G	Taiwan Semiconductor Corporation	6.2	±5	1	2	1.2 @ 200	-65 to 200	DO-204AL (DO-41)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compliance):

The following parts are recommended as primary substitutes due to active product status and full compliance certifications:

1N4735A (Lumimax Optoelectronic Technology) - Active status with RoHS compliance. Maintains full electrical and thermal specifications with -65°C to 200°C operating range.
1N4735A,133 (Nexperia USA Inc.) - Active status with ROHS3 compliance. Identical electrical parameters with DO-41 package configuration.
1N4735A,113 (Nexperia USA Inc.) - Active status with ROHS3 compliance. Full parameter equivalence with -65°C to 200°C operating range.
1N4735A TR PBFREE (Central Semiconductor Corp) - Active status with ROHS3 compliance. Maintains complete electrical specification across full temperature range.
1N4735ATR (onsemi) - Active status with ROHS3 compliance. Highest inventory availability (12,900 pcs) with full electrical equivalence.
1N4735G (Taiwan Semiconductor Corporation) - Active status with ROHS3 compliance. Complete parameter match with -65°C to 200°C operating range.

Secondary Substitutes (Temperature or Compliance Limitations):

1N4735AP/TR8 (Microchip Technology) - Active status with ROHS3 compliance. Operating temperature limited to -65°C to 150°C. Suitable for applications not requiring full 200°C upper limit.
1N4735AP/TR12 (Microchip Technology) - Active status but RoHS non-compliant. Operating temperature limited to -65°C to 150°C. Use only in applications where RoHS compliance is not required.
1N4735A-T50A (Fairchild Semiconductor) - Active status with highest inventory (45,811 pcs). RoHS status not specified. Maintains full electrical specifications.

Obsolete Alternatives (Not Recommended for New Designs):

1N4735A-T50R (onsemi) - Obsolete status. Use only for legacy system maintenance where active alternatives are unavailable.

Frequently Asked Questions (FAQ)

Q: Can I use 1N4735AP/TR8 as a direct replacement for 1N4735A-TP?

A: The 1N4735AP/TR8 provides electrical equivalence for the critical Zener voltage, power rating, and impedance specifications. However, the operating temperature range is limited to -65°C to 150°C compared to the original -65°C to 200°C. Use this substitute only if your application does not require operation above 150°C.

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

A: DO-41 and DO-204AL are equivalent package designations for the same through-hole axial diode form factor. Both are mechanically and electrically compatible for circuit board mounting and soldering.

Q: Are all substitute parts ROHS3 compliant?

A: No. The 1N4735AP/TR12 (Microchip Technology) is RoHS non-compliant. All other listed substitutes are either ROHS3 compliant or RoHS compliant. Verify compliance requirements for your application before selection.

Q: Which substitute has the best inventory availability?

A: The 1N4735A-T50A (Fairchild Semiconductor) has the highest inventory with 45,811 pcs in stock. The 1N4735ATR (onsemi) is the second option with 12,900 pcs available.

Q: Can I use 1N4735A-T50R for new designs?

A: No. The 1N4735A-T50R is classified as obsolete. For new designs, select from active-status alternatives such as 1N4735A, 1N4735A,133, 1N4735ATR, or 1N4735G.

Q: What are the key electrical parameters that determine substitutability?

A: The critical parameters are Zener voltage (6.2 V), tolerance (±5%), maximum power (1 W), impedance (2 Ohms maximum), reverse leakage current (10 µA @ 3 V), and forward voltage (1.2 V @ 200 mA). All listed substitutes maintain these specifications.

Q: Is the forward voltage specification important for my application?

A: Forward voltage becomes relevant only if the diode conducts in forward bias during circuit operation. For typical Zener regulation applications where the diode operates in reverse bias, forward voltage is not a primary selection criterion. Verify your circuit topology to determine relevance.

Q: Can I mix different manufacturers' parts in the same circuit board?

A: Yes. All listed substitutes are electrically and mechanically equivalent. Mixing manufacturers is acceptable from an engineering standpoint, though procurement and quality assurance processes may impose additional requirements.

Q: What does "Cut Tape (CT)" packaging mean?

A: Cut Tape packaging indicates individual components cut from a continuous tape reel. This format is suitable for manual assembly or small-quantity applications. Tape & Reel (TR) packaging maintains components on continuous tape for automated assembly equipment.

Q: Should I select based on operating temperature range?

A: Select based on your application's actual operating temperature requirements. If your circuit operates only within -65°C to 150°C, the 1N4735AP/TR8 or 1N4735AP/TR12 are acceptable. For applications requiring the full -65°C to 200°C range, select alternatives with extended temperature specifications.

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