1N753A Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N753A is a 6.2 V, 500 mW Zener diode manufactured by onsemi in a DO-35 through-hole package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements. The 1N753A serves voltage regulation and protection applications where a 6.2 V reference voltage with ±5% tolerance and 500 mW power dissipation capacity is required.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	6.2	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	7	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 1 V	—
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	—
Operating Temperature	-65°C ~ 200°C	—
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—

Substitute Part Grouping Explanation

Substitution of the 1N753A is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 6.2 V
Tolerance: ±5%
Power - Max: 500 mW (minimum requirement)
Mounting Type: Through Hole
Package / Case: DO-35 or equivalent axial package

Substitution Logic:

Parts are grouped into three categories based on electrical and mechanical compatibility:

Direct Equivalents (Same Package, Same Power Rating): Parts with identical 6.2 V nominal voltage, ±5% tolerance, 500 mW power rating, and DO-35 package. These provide pin-for-pin and functional equivalence.
Higher Power Substitutes (Same Package, Higher Power Rating): Parts with 6.2 V nominal voltage, ±5% tolerance, and power ratings exceeding 500 mW in DO-35 or larger packages. These are suitable for applications requiring additional thermal margin or higher current capacity.
Lower Power Substitutes (Same Package, Lower Power Rating): Parts with 6.2 V nominal voltage, ±5% tolerance, and power ratings below 500 mW. These are suitable only for applications with reduced power dissipation requirements.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Package	Zzt (Ohms)	Vf @ If (V @ mA)	Operating Temp (°C)	Product Status
1N753A	onsemi	6.2	±5%	500	DO-35	7	1.5 @ 200	-65 ~ 200	Obsolete
1N753A TR PBFREE	Central Semiconductor Corp	6.2	±5%	500	DO-35	7	1.5 @ 200	-65 ~ 200	Active
1N753A-1	Microchip Technology	6.2	±5%	500	DO-35	3	1.1 @ 200	-65 ~ 175	Active
1N4691	Microchip Technology	6.2	±5%	500	DO-35	—	1.1 @ 200	-65 ~ 175	Active
1N5234B	Microchip Technology	6.2	±5%	500	DO-35	7	1.5 @ 200	-65 ~ 175	Active
BZX79C6V2	Taiwan Semiconductor Corporation	6.2	±5%	500	DO-35	10	1.5 @ 100	-65 ~ 175	Active
1N753	Microchip Technology	6.2	±10%	400	DO-35	7	1.1 @ 200	-65 ~ 175	Active
1N3513A	Microchip Technology	6.2	±5%	400	DO-35	3	1.1 @ 200	-65 ~ 175	Active
1N4735A	Lumimax Optoelectronic Technology	6.2	±5%	1000	DO-41	2	1.2 @ 200	-65 ~ 200	Active
1N5920BP-TP	Micro Commercial Co	6.2	±5%	1500	DO-41	2	1.5 @ 200	-55 ~ 175	Active
1EZ6.2D5-TP	Micro Commercial Co	6.2	±5%	125	DO-41	2	1.2 @ 200	-55 ~ 150	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended for 1:1 Replacement):

The following parts provide functional and mechanical equivalence to the 1N753A and are suitable for direct substitution in applications requiring 6.2 V, 500 mW, ±5% tolerance Zener diodes in DO-35 packages:

1N753A TR PBFREE (Central Semiconductor Corp): Active product with identical electrical specifications and extended operating temperature range (-65°C to 200°C). RoHS3 compliant. Highest compatibility for direct replacement.
1N5234B (Microchip Technology): Active product with matching 6.2 V, 500 mW, ±5% specifications in DO-35 package. Impedance and forward voltage characteristics identical to original. Operating temperature range -65°C to 175°C.
1N753A-1 (Microchip Technology): Active product with 6.2 V, 500 mW, ±5% specifications. Lower impedance (3 Ohms vs. 7 Ohms) and lower forward voltage (1.1 V vs. 1.5 V @ 200 mA). Operating temperature -65°C to 175°C.
1N4691 (Microchip Technology): Active product with 6.2 V, 500 mW, ±5% specifications in DO-35 package. Lower forward voltage (1.1 V @ 200 mA). Operating temperature -65°C to 175°C.
BZX79C6V2 (Taiwan Semiconductor Corporation): Active product with 6.2 V, 500 mW, ±5% specifications in DO-35 package. RoHS3 compliant. Slightly higher impedance (10 Ohms). Operating temperature -65°C to 175°C.

Higher Power Alternatives (For Increased Thermal Margin):

1N4735A (Lumimax Optoelectronic Technology): 1 W power rating in DO-41 package. Suitable for applications requiring higher power dissipation capacity. Extended operating temperature range (-65°C to 200°C). RoHS compliant.
1N5920BP-TP (Micro Commercial Co): 1.5 W power rating in DO-41 package. Highest power capacity among substitutes. RoHS3 compliant. Suitable for high-current applications.

Lower Power Alternative (For Reduced Power Requirements):

1N3513A (Microchip Technology): 400 mW power rating in DO-35 package. Suitable only for applications with confirmed power dissipation below 400 mW.
1EZ6.2D5-TP (Micro Commercial Co): 125 mW power rating in DO-41 package. Suitable only for low-power applications with confirmed power dissipation below 125 mW.

Tolerance Consideration:

1N753 (Microchip Technology): ±10% tolerance (vs. ±5% for 1N753A). Acceptable only for applications with relaxed voltage tolerance requirements.

Frequently Asked Questions (FAQ)

Q: Can I use 1N753A-1 as a direct replacement for 1N753A?

A: Yes. Both parts have identical 6.2 V nominal voltage, ±5% tolerance, and 500 mW power rating in DO-35 packages. The 1N753A-1 has lower impedance (3 Ohms vs. 7 Ohms) and lower forward voltage (1.1 V vs. 1.5 V @ 200 mA), which are favorable characteristics. Operating temperature range is -65°C to 175°C (vs. -65°C to 200°C for the original).

Q: What is the difference between DO-35 and DO-41 packages?

A: DO-35 and DO-41 are both axial through-hole packages for diodes. DO-35 is a smaller package, while DO-41 is larger. Parts in DO-41 packages (such as 1N4735A and 1N5920BP-TP) typically have higher power ratings due to increased thermal dissipation capability. DO-41 parts are not pin-for-pin compatible with DO-35 footprints and require PCB layout modifications.

Q: Can I use a higher power-rated Zener diode (1 W or 1.5 W) in place of the 500 mW 1N753A?

A: Yes, if the application circuit permits package change from DO-35 to DO-41. Higher power-rated diodes (1N4735A at 1 W, 1N5920BP-TP at 1.5 W) provide additional thermal margin and are electrically compatible with 6.2 V, ±5% specifications. However, PCB layout modifications are required due to different package dimensions.

Q: What does ±5% tolerance mean for a Zener diode?

A: Zener voltage tolerance specifies the acceptable deviation from the nominal 6.2 V specification. ±5% tolerance means the actual Zener voltage will be between 5.89 V and 6.51 V. The 1N753 with ±10% tolerance has a wider acceptable range (5.58 V to 6.82 V) and is suitable only for applications with relaxed voltage regulation requirements.

Q: Is BZX79C6V2 suitable for my application?

A: BZX79C6V2 is electrically compatible with 1N753A (6.2 V, 500 mW, ±5%, DO-35 package). It has slightly higher impedance (10 Ohms vs. 7 Ohms) and operates at a lower maximum temperature (175°C vs. 200°C). It is RoHS3 compliant and suitable for applications where compliance is required.

Q: Why does 1N753A TR PBFREE have the same specifications as 1N753A but is listed as active?

A: 1N753A TR PBFREE is the lead-free (PBFREE) version of the 1N753A manufactured by Central Semiconductor Corp. It maintains identical electrical specifications and is RoHS3 compliant. The original 1N753A by onsemi is obsolete; the TR PBFREE variant is the active equivalent.

Q: Can I use 1N3513A (400 mW) instead of 1N753A (500 mW)?

A: Only if your application circuit dissipates less than 400 mW in the Zener diode. If the circuit requires the full 500 mW capacity, 1N3513A will exceed its power rating and may fail. Verify actual power dissipation in your circuit before selecting a lower-rated substitute.

Q: What is the significance of impedance (Zzt) in Zener diode selection?

A: Impedance (Zzt) affects the dynamic voltage regulation characteristics of the Zener diode. Lower impedance provides better voltage regulation under varying load conditions. Parts with lower impedance (such as 1N753A-1 at 3 Ohms or 1N4735A at 2 Ohms) offer superior regulation compared to higher impedance parts (such as BZX79C6V2 at 10 Ohms).

Q: Are all substitute parts RoHS compliant?

A: No. 1N753A-1, 1N4691, and 1N3513A are listed as RoHS non-compliant. 1N753A TR PBFREE, 1N4735A, 1N5920BP-TP, and BZX79C6V2 are RoHS3 compliant. Verify RoHS compliance requirements for your application before final part selection.

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