1N753ATR Equivalent & Substitute Parts

Part Overview

The 1N753ATR is a Zener diode manufactured by onsemi, rated at 6.2 V nominal with 500 mW power dissipation and ±5% tolerance. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The through-hole DO-35 package configuration remains widely supported across multiple manufacturers, enabling direct functional replacement with compatible alternatives.

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	nA
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	V
Operating Temperature	-65°C ~ 200°C	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—

Substitute Part Grouping Explanation

Substitution of the 1N753ATR is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 6.2 V
Tolerance: ±5% or tighter
Power - Max: 500 mW or greater
Mounting Type: Through Hole
Package / Case: DO-35 (DO-204AH) or compatible axial configuration

Secondary Compatibility Factors:

Impedance (Max): 7 Ohms or lower
Voltage - Forward (Vf) (Max) @ If: 1.5 V @ 200 mA or lower
Operating Temperature Range: Must encompass application requirements

Substitute parts are grouped into three categories based on electrical equivalence and package compatibility:

Category 1: Direct Electrical Equivalents (DO-35 Package) Parts matching all primary criteria with identical or superior electrical performance in the same DO-35 package form factor.

Category 2: Higher Power Alternatives (DO-41 Package) Parts with identical zener voltage and tolerance but increased power rating, requiring package footprint verification.

Category 3: Precision Variants (DO-35 Package) Parts with tighter tolerance specifications or enhanced performance characteristics in the DO-35 package.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Status
1N753ATR	onsemi	6.2 V	±5%	500 mW	7 Ω	1.5 V @ 200 mA	-65°C ~ 200°C	DO-35	Obsolete
1N5234B	Microchip Technology	6.2 V	±5%	500 mW	7 Ω	1.5 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N5234BTR	Fairchild Semiconductor	6.2 V	±5%	500 mW	7 Ω	1.2 V @ 200 mA	-65°C ~ 200°C	DO-35	Active
BZX79C6V2	Taiwan Semiconductor Corporation	6.2 V	±5%	500 mW	10 Ω	1.5 V @ 100 mA	-65°C ~ 175°C	DO-35	Active
1N753D	Microchip Technology	6.2 V	±1%	500 mW	7 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N753A-1	Microchip Technology	6.2 V	±5%	500 mW	3 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N4691	Microchip Technology	6.2 V	±5%	500 mW	—	1.1 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N3513A	Microchip Technology	6.2 V	±5%	400 mW	3 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N753	Microchip Technology	6.2 V	±10%	400 mW	7 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-35	Active
1N4735A	Lumimax Optoelectronic Technology	6.2 V	±5%	1 W	2 Ω	1.2 V @ 200 mA	-65°C ~ 200°C	DO-41	Active
1EZ6.2D5-TP	Micro Commercial Co	6.2 V	±5%	125 mW	2 Ω	1.2 V @ 200 mA	-55°C ~ 150°C	DO-41	Active

Engineering Selection Recommendations

Primary Recommendation: 1N5234BTR (Fairchild Semiconductor)

The 1N5234BTR provides direct electrical equivalence to the 1N753ATR with identical zener voltage (6.2 V), tolerance (±5%), power rating (500 mW), and impedance (7 Ω). This part is active in production status and maintains the same DO-35 package configuration. The operating temperature range extends to 200°C, matching the original specification. Forward voltage is reduced to 1.2 V @ 200 mA, representing improved performance. This part is suitable for direct pin-for-pin replacement without circuit modification.

Secondary Recommendation: 1N753D (Microchip Technology)

The 1N753D offers enhanced precision with ±1% tolerance compared to the ±5% specification of the 1N753ATR. Electrical parameters remain equivalent with 6.2 V zener voltage, 500 mW power rating, and DO-35 package. This part is active in production and suitable for applications requiring tighter voltage regulation. Operating temperature range is -65°C ~ 175°C, which is acceptable for most applications but does not extend to 200°C.

Tertiary Recommendation: 1N753A-1 (Microchip Technology)

The 1N753A-1 matches the 1N753ATR in zener voltage (6.2 V), tolerance (±5%), and power rating (500 mW) with DO-35 package compatibility. This part features reduced impedance (3 Ω) and lower forward voltage (1.1 V @ 200 mA), providing superior performance characteristics. Active production status and unlimited moisture sensitivity level support long-term availability.

Higher Power Alternative: 1N4735A (Lumimax Optoelectronic Technology)

The 1N4735A provides identical zener voltage (6.2 V) and tolerance (±5%) with increased power rating (1 W). This part requires verification of PCB footprint compatibility due to DO-41 package configuration. Operating temperature range extends to 200°C. This option is suitable for applications requiring higher power dissipation capacity.

Reduced Power Alternative: 1EZ6.2D5-TP (Micro Commercial Co)

The 1EZ6.2D5-TP maintains 6.2 V zener voltage and ±5% tolerance but with reduced power rating (125 mW). This part is suitable only for low-power applications and requires verification that circuit current requirements do not exceed 125 mW dissipation. DO-41 package requires footprint verification. Operating temperature range is limited to -55°C ~ 150°C.

Compliance Considerations:

Parts with active production status are preferred for new designs. The 1N5234B and 1N5234BTR are RoHS non-compliant; applications requiring RoHS compliance should select BZX79C6V2 (ROHS3 Compliant) or 1N4735A. All recommended parts maintain REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can the 1N753ATR be directly replaced with the 1N5234B?

A: Yes. The 1N5234B provides direct electrical equivalence with identical zener voltage (6.2 V), tolerance (±5%), power rating (500 mW), and DO-35 package. The operating temperature range is -65°C ~ 175°C, which is acceptable for most applications. This part is active in production and suitable for pin-for-pin replacement.

Q: What is the difference between 1N5234B and 1N5234BTR?

A: Both parts share identical electrical specifications (6.2 V, ±5%, 500 mW, DO-35). The primary difference is manufacturer: 1N5234B is manufactured by Microchip Technology, while 1N5234BTR is manufactured by Fairchild Semiconductor. The 1N5234BTR offers extended operating temperature range to 200°C and reduced forward voltage (1.2 V @ 200 mA), making it more closely aligned with the original 1N753ATR specification.

Q: Why is the 1N753D recommended as a precision variant?

A: The 1N753D maintains all electrical equivalence parameters (6.2 V, 500 mW, DO-35) but provides tighter tolerance specification of ±1% compared to the ±5% of the 1N753ATR. This enhanced precision is beneficial for voltage regulation applications requiring stricter zener voltage control. All other electrical parameters remain equivalent.

Q: Can the 1N4735A be used as a direct replacement?

A: The 1N4735A provides identical zener voltage (6.2 V) and tolerance (±5%) but uses a DO-41 package instead of DO-35. PCB footprint verification is required before substitution. The increased power rating (1 W versus 500 mW) is beneficial for high-current applications but does not affect pin compatibility if the footprint is verified as compatible.

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

A: Impedance (Zzt) affects the dynamic regulation characteristics of the zener diode. Lower impedance values provide better voltage regulation under varying load conditions. The 1N753ATR specifies 7 Ω maximum impedance. Substitute parts with lower impedance (such as 1N753A-1 at 3 Ω) provide improved regulation performance, while parts with higher impedance (such as BZX79C6V2 at 10 Ω) may exhibit slightly reduced regulation quality.

Q: Are there RoHS-compliant alternatives available?

A: Yes. The BZX79C6V2 manufactured by Taiwan Semiconductor Corporation is ROHS3 Compliant and provides equivalent electrical specifications (6.2 V, ±5%, 500 mW, DO-35). The 1N4735A is also available and suitable for applications requiring RoHS compliance. The 1N5234B and 1N5234BTR are RoHS non-compliant and should not be used in applications with RoHS requirements.

Q: What is the impact of operating temperature range differences?

A: The 1N753ATR specifies -65°C ~ 200°C operating range. Most substitute parts (1N5234B, BZX79C6V2, 1N753D, 1N753A-1, 1N4691, 1N3513A, 1N753) operate to -65°C ~ 175°C, which is acceptable for most industrial and commercial applications. The 1N5234BTR and 1N4735A extend to 200°C, matching the original specification. The 1EZ6.2D5-TP is limited to -55°C ~ 150°C and should be used only in temperature-controlled environments.

Q: Can the 1N3513A be used as a substitute despite lower power rating?

A: The 1N3513A is rated at 400 mW compared to the 1N753ATR's 500 mW. This part is suitable only if circuit design ensures maximum zener current does not exceed the 400 mW dissipation limit. Verification of actual circuit power requirements is necessary before substitution. The part maintains equivalent zener voltage (6.2 V), tolerance (±5%), and DO-35 package.

Q: What does "Obsolete" status mean for the 1N753ATR?

A: Obsolete status indicates that onsemi has discontinued production of the 1N753ATR. While existing inventory may be available, long-term procurement cannot be guaranteed. Selection of an active substitute part ensures continued availability for future production runs and design revisions. All recommended substitute parts maintain active production status.

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