1N758ATR Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N758ATR is a 10 V, 500 mW Zener diode manufactured by onsemi in DO-35 axial through-hole packaging. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements. The part maintains electrical specifications suitable for voltage regulation and protection applications within its power and voltage ratings. Equivalent parts are available from multiple manufacturers with active product status, ensuring supply chain continuity and design flexibility.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	10	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	17	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 1 V	nA
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	V
Operating Temperature Range	-65°C to 200°C	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-

Substitute Part Grouping Explanation

Substitution of the 1N758ATR is determined by the following critical parameters: nominal Zener voltage (10 V), tolerance (±5%), maximum power dissipation (500 mW), and through-hole axial mounting configuration. Parts are grouped into three categories based on substitution compatibility:

Direct Equivalents (Same Voltage, Power, Package): Parts matching 10 V nominal voltage, 500 mW power rating, and DO-35 packaging with ±5% tolerance. These parts are functionally interchangeable in applications designed for the 1N758ATR specifications.

Similar Substitutes (Same Voltage, Higher Power Rating): Parts with 10 V nominal voltage and ±5% tolerance but higher power ratings (1 W, 1.5 W, or 3 W) in alternative through-hole packages (DO-41 or axial). These parts operate within the same voltage regulation range but accommodate higher power dissipation requirements.

Non-Recommended Substitutes: Parts with different nominal voltages (12 V) are excluded from substitution consideration due to voltage specification mismatch.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Package	Product Status	Operating Temp
1N758ATR	onsemi	10 V	±5%	500 mW	17 Ohms	DO-35	Obsolete	-65°C to 200°C
BZX79C10	Taiwan Semiconductor Corporation	10 V	±5%	500 mW	20 Ohms	DO-35	Active	-65°C to 175°C
BZX79C10-T50A	onsemi	10 V	±5%	500 mW	20 Ohms	DO-35	Active	-65°C to 200°C
1N5240B	Microchip Technology	10 V	±5%	500 mW	17 Ohms	DO-35	Active	-65°C to 175°C
1N5240BTR	Fairchild Semiconductor	10 V	±5%	500 mW	17 Ohms	DO-35	Active	-65°C to 200°C
1N4740A	Lumimax Optoelectronic Technology	10 V	±5%	1 W	7 Ohms	DO-41	Active	-65°C to 200°C
1EZ10D5-AP	Micro Commercial Co	10 V	±5%	1 W	7 Ohms	DO-41	Active	-55°C to 150°C
1EZ10D5-TP	Micro Commercial Co	10 V	±5%	1 W	7 Ohms	DO-41	Active	-55°C to 150°C
1N5067	Microchip Technology	10 V	±5%	3 W	4 Ohms	Axial	Active	-65°C to 175°C
1N5925BP-TP	Micro Commercial Co	10 V	±5%	1.5 W	4.5 Ohms	DO-41	Active	-55°C to 175°C

Engineering Selection Recommendations

Direct Equivalents for Pin-Compatible Replacement:

BZX79C10-T50A (onsemi) and 1N5240BTR (Fairchild Semiconductor) are direct functional equivalents with identical voltage (10 V), power (500 mW), and DO-35 packaging. Both parts are active products with RoHS3 compliance and REACH unaffected status. BZX79C10-T50A extends the operating temperature range to 200°C, matching the original 1N758ATR specification. 1N5240BTR maintains the same impedance (17 Ohms) as the original part.

BZX79C10 (Taiwan Semiconductor Corporation) provides equivalent electrical performance in DO-35 packaging with active product status. Operating temperature is limited to 175°C, which may be a constraint in high-temperature applications.

1N5240B (Microchip Technology) offers identical impedance (17 Ohms) and voltage specifications in DO-35 packaging with active status. Operating temperature is limited to 175°C.

Higher Power Alternatives for Increased Dissipation:

1N4740A (Lumimax Optoelectronic Technology) and 1EZ10D5-AP/1EZ10D5-TP (Micro Commercial Co) provide 1 W power rating in DO-41 packaging with 10 V nominal voltage. These parts accommodate applications requiring higher power dissipation while maintaining voltage regulation specifications. Operating temperature for Micro Commercial Co parts is limited to 150°C.

1N5925BP-TP (Micro Commercial Co) provides 1.5 W power rating in DO-41 packaging with improved impedance characteristics (4.5 Ohms). Operating temperature range extends to 175°C.

1N5067 (Microchip Technology) offers 3 W power rating in axial packaging with superior impedance (4 Ohms) for high-power applications. Operating temperature is limited to 175°C.

Compliance Considerations:

Parts with RoHS3 compliance (BZX79C10-T50A, 1N5925BP-TP) are suitable for applications subject to RoHS directives. All listed substitutes maintain REACH unaffected status, consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can BZX79C10-T50A directly replace 1N758ATR in existing PCB designs?

A: Yes. BZX79C10-T50A is a direct equivalent with identical 10 V nominal voltage, 500 mW power rating, and DO-35 axial through-hole packaging. The part is pin-compatible and electrically interchangeable. Operating temperature extends to 200°C, matching the original specification.

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 suitable for 500 mW power dissipation. DO-41 is a larger package designed for higher power ratings (1 W and above). Physical dimensions differ, requiring PCB layout modifications if substituting between these packages.

Q: Can I use a 1 W Zener diode (1N4740A) in place of the 500 mW 1N758ATR?

A: Yes, provided the PCB layout accommodates the larger DO-41 package. The 1N4740A maintains the same 10 V nominal voltage and ±5% tolerance. The higher power rating (1 W) allows operation in applications with greater power dissipation. Impedance is lower (7 Ohms vs. 17 Ohms), which may affect voltage regulation characteristics in specific circuit configurations.

Q: Are there RoHS-compliant alternatives to the 1N758ATR?

A: Yes. BZX79C10-T50A (onsemi) and 1N5925BP-TP (Micro Commercial Co) are RoHS3 compliant. Both maintain 10 V nominal voltage and ±5% tolerance. BZX79C10-T50A provides 500 mW in DO-35 packaging. 1N5925BP-TP provides 1.5 W in DO-41 packaging.

Q: What is the impedance specification and why does it matter?

A: Impedance (Zzt) is the dynamic impedance of the Zener diode at the specified test current. Lower impedance indicates better voltage regulation characteristics with reduced voltage variation across the operating current range. The original 1N758ATR has 17 Ohms impedance. Direct equivalents (1N5240B, 1N5240BTR) maintain this specification. Higher-power alternatives have lower impedance (4 to 7 Ohms), providing improved regulation but potentially different circuit behavior.

Q: Can I substitute a 12 V Zener diode for the 10 V 1N758ATR?

A: No. Voltage rating is a critical parameter that cannot be substituted. A 12 V Zener diode will regulate at a different voltage level and is not functionally equivalent for applications designed for 10 V regulation.

Q: What is the operating temperature range limitation for substitute parts?

A: The original 1N758ATR operates from -65°C to 200°C. BZX79C10-T50A and 1N5240BTR maintain this full range. Other substitutes are limited to -65°C to 175°C (BZX79C10, 1N5240B, 1N5067) or -55°C to 150°C (1EZ10D5-AP, 1EZ10D5-TP). Temperature range selection depends on application requirements.

Q: Are all substitute parts in active production status?

A: Yes. All listed substitute parts have active product status, ensuring ongoing availability and supply chain reliability. The original 1N758ATR is obsolete, making active substitutes necessary for new designs and ongoing production.

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