1N758A Zener Diode 10V 500mW Equivalent & Substitute Parts

Part Overview

The 1N758A is a through-hole zener diode rated at 10 V nominal voltage with 500 mW maximum power dissipation and ±5% tolerance. Manufactured by Central Semiconductor Corp in DO-35 (DO-204AH) axial package, this component is classified as Active product status. Substitute parts are necessary when the original manufacturer part becomes unavailable, when alternative packaging formats are required for assembly compatibility, or when enhanced thermal performance or compliance certifications are needed for specific applications.

Key Parameters

Parameter	Value	Unit	Significance for Substitution
Voltage - Zener (Nom)	10	V	Critical - must match exactly
Tolerance	±5%	%	Defines voltage regulation accuracy
Power - Max	500	mW	Thermal capability - determines current handling
Impedance (Max)	17	Ohms	Dynamic resistance - affects regulation quality
Current - Reverse Leakage @ Vr	100	nA @ 1 V	Leakage characteristics
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA	Forward conduction characteristics
Operating Temperature	-65 to 200	°C	Thermal operating range
Mounting Type	Through Hole	-	PCB assembly compatibility
Package / Case	DO-35, DO-204AH, Axial	-	Physical form factor and footprint

Substitute Part Grouping Explanation

Substitute parts for the 1N758A are grouped based on strict electrical and mechanical compatibility criteria. All substitute candidates must maintain the following core parameters:

Mandatory Matching Parameters:

Voltage - Zener (Nom): 10 V (exact match required)
Tolerance: ±5% or better (±5% acceptable, ±10% represents degraded specification)
Power - Max: 500 mW minimum (higher ratings acceptable for thermal margin)
Mounting Type: Through Hole (required for PCB assembly compatibility)
Package / Case: DO-35, DO-204AH, or DO-41 axial packages (mechanical compatibility)

Acceptable Variation Parameters:

Impedance (Max): 17 Ohms or lower (lower impedance improves regulation)
Current - Reverse Leakage: Higher values acceptable within application limits
Voltage - Forward (Vf): Variations acceptable if within circuit design margins
Operating Temperature: Range of -65°C to 200°C or -65°C to 175°C both acceptable

Substitutes are organized into three categories: Direct Package Equivalents (DO-35 form factor), Higher Power Alternatives (1 W and above for enhanced thermal capability), and Alternative Package Options (DO-7 and DO-41 for different assembly requirements).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Package	Temp Range	RoHS Status
1N758A	Central Semiconductor Corp	10 V	±5%	500 mW	17 Ω	DO-35	-65 to 200°C	Non-compliant
1N758A	Good-Ark Semiconductor	10 V	±5%	500 mW	17 Ω	DO-35	-65 to 175°C	ROHS3 Compliant
1N5240B	Microchip Technology	10 V	±5%	500 mW	17 Ω	DO-35	-65 to 175°C	Non-compliant
1N961B	Microchip Technology	10 V	±5%	500 mW	8.5 Ω	DO-7	-65 to 175°C	Non-compliant
1N961A	Microchip Technology	10 V	±10%	500 mW	8.5 Ω	DO-7	-65 to 175°C	Non-compliant
1N4104	Microchip Technology	10 V	±5%	500 mW	200 Ω	DO-7	-65 to 175°C	Non-compliant
1N4740A,113	Nexperia USA Inc.	10 V	±5%	1 W	7 Ω	DO-41	-65 to 200°C	ROHS3 Compliant
1N4740A,133	NXP Semiconductors	10 V	±5%	1 W	7 Ω	DO-41	-65 to 200°C	Not specified
1N4465	Microchip Technology	10 V	±5%	1.5 W	5 Ω	DO-41	-65 to 175°C	Non-compliant
BZV85-C10,133	NXP Semiconductors	10 V	±5%	1.3 W	8 Ω	DO-41	-65 to 200°C	Not specified
1N5925BRLG	onsemi	10 V	±5%	3 W	4.5 Ω	DO-41	-65 to 200°C	ROHS3 Compliant

Engineering Selection Recommendations

Direct Package Equivalent (DO-35 Form Factor):

The 1N758A manufactured by Good-Ark Semiconductor provides identical electrical specifications with ROHS3 compliance certification. This substitute maintains the same DO-35 package geometry, 10 V nominal voltage, ±5% tolerance, and 500 mW power rating. The operating temperature range is -65°C to 175°C, which is 25°C lower than the original part. This substitute is suitable for applications where RoHS compliance is required and the reduced upper temperature limit does not conflict with circuit design requirements.

The 1N5240B from Microchip Technology also provides DO-35 package compatibility with identical electrical parameters. This part maintains 17 Ohms maximum impedance and 500 mW power rating. RoHS compliance status is non-compliant, matching the original 1N758A classification.

Alternative Package Options (DO-7 Form Factor):

The 1N961B from Microchip Technology provides 10 V nominal voltage with ±5% tolerance and 500 mW power rating in DO-7 package. This part features lower impedance (8.5 Ohms versus 17 Ohms), which improves voltage regulation characteristics. The DO-7 package is mechanically different from DO-35, requiring PCB footprint modification. This substitute is applicable when DO-7 package compatibility exists in the circuit design.

The 1N961A from Microchip Technology is electrically similar to 1N961B but with ±10% tolerance specification. This represents degraded voltage accuracy and is suitable only when circuit design tolerates ±10% zener voltage variation.

The 1N4104 from Microchip Technology maintains 10 V voltage and 500 mW power in DO-7 package but features significantly higher impedance (200 Ohms). This higher impedance degrades voltage regulation performance and is suitable only when impedance variation does not impact circuit function.

Higher Power Alternatives (1 W and Above):

The 1N4740A,113 from Nexperia USA Inc. and 1N4740A,133 from NXP Semiconductors provide 1 W power rating in DO-41 package with 10 V nominal voltage and ±5% tolerance. These parts feature lower impedance (7 Ohms) and extended operating temperature to 200°C. The 1N4740A,113 carries ROHS3 compliance certification. DO-41 package requires PCB footprint modification. These substitutes are applicable when enhanced thermal capability is required or when DO-41 package compatibility exists.

The 1N4465 from Microchip Technology provides 1.5 W power rating in DO-41 package with 10 V voltage and ±5% tolerance. Impedance is 5 Ohms, providing superior voltage regulation. Operating temperature range is -65°C to 175°C. This substitute is suitable for applications requiring higher power dissipation capability.

The BZV85-C10,133 from NXP Semiconductors provides 1.3 W power rating in DO-41 package with 10 V voltage and ±5% tolerance. Impedance is 8 Ohms. Operating temperature extends to 200°C. This substitute offers balanced thermal capability and regulation characteristics.

The 1N5925BRLG from onsemi provides 3 W power rating in DO-41 package with 10 V voltage and ±5% tolerance. This part features the lowest impedance (4.5 Ohms) among all substitutes, providing optimal voltage regulation. Operating temperature range is -65°C to 200°C. ROHS3 compliance is certified. This substitute is applicable for applications requiring maximum thermal margin and superior regulation performance.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 1N758A with a higher power rated zener diode such as the 1N4740A or 1N5925BRLG?

A: Yes, higher power rated zener diodes are functionally compatible substitutes provided the 10 V nominal voltage and ±5% tolerance specifications are maintained. Higher power ratings provide additional thermal margin and do not degrade circuit function. However, the DO-41 package used by these higher power alternatives requires different PCB footprint and lead spacing compared to the DO-35 package of the 1N758A. Physical board layout modification is necessary.

Q: What is the difference between the 1N961A and 1N961B?

A: Both parts are 10 V zener diodes in DO-7 package with 500 mW power rating. The primary difference is voltage tolerance: 1N961A specifies ±10% tolerance while 1N961B specifies ±5% tolerance. The 1N758A original part specifies ±5% tolerance, making 1N961B the more accurate substitute. The 1N961A is suitable only when circuit design tolerates the wider ±10% voltage variation.

Q: Why does the 1N4104 have much higher impedance (200 Ohms) compared to other substitutes?

A: Impedance variation reflects different manufacturing processes and internal device characteristics among manufacturers. Higher impedance (200 Ohms for 1N4104 versus 17 Ohms for 1N758A) results in poorer voltage regulation under load current changes. The 1N4104 is suitable only when the application does not require tight voltage regulation or when impedance variation is within acceptable circuit design margins.

Q: Is the Good-Ark Semiconductor 1N758A substitute acceptable for RoHS-compliant applications?

A: Yes, the Good-Ark Semiconductor 1N758A carries ROHS3 compliance certification, making it suitable for applications requiring RoHS compliance. The original Central Semiconductor Corp 1N758A is RoHS non-compliant. The Good-Ark substitute maintains identical electrical specifications (10 V, ±5%, 500 mW, DO-35 package) with the addition of RoHS3 certification.

Q: Can I use the 1N5925BRLG (3 W) in place of the 1N758A (500 mW)?

A: Yes, the 1N5925BRLG is electrically compatible as a substitute. The higher 3 W power rating provides additional thermal capability without degrading circuit function. The 1N5925BRLG features superior impedance characteristics (4.5 Ohms versus 17 Ohms), resulting in better voltage regulation. However, the DO-41 package requires PCB footprint modification compared to the DO-35 package of the 1N758A.

Q: What is the significance of operating temperature range differences between substitutes?

A: The 1N758A specifies -65°C to 200°C operating range. Some substitutes such as 1N961B and 1N5240B specify -65°C to 175°C, which is 25°C lower at the upper limit. If the application requires operation at temperatures above 175°C, only substitutes with -65°C to 200°C range are acceptable. For applications operating below 175°C, both ranges are functionally equivalent.

Q: Are there any compliance or certification differences I should consider?

A: Yes. The original 1N758A is RoHS non-compliant. Several substitutes carry ROHS3 compliance certification: Good-Ark Semiconductor 1N758A, Nexperia 1N4740A,113, and onsemi 1N5925BRLG. All parts listed carry REACH Unaffected status and EAR99 ECCN classification. If RoHS compliance is required for your application, select only ROHS3-certified substitutes.

Q: What package considerations are important when selecting a substitute?

A: The 1N758A uses DO-35 (DO-204AH) axial package. Direct substitutes maintaining DO-35 package include the Good-Ark 1N758A and Microchip 1N5240B, requiring no PCB layout changes. Alternative packages include DO-7 (1N961A, 1N961B, 1N4104) and DO-41 (1N4740A, 1N4465, BZV85-C10, 1N5925BRLG). Each package has different lead spacing and footprint geometry. Verify PCB footprint compatibility before selecting a substitute with different package designation.

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