1N5236B A0G Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5236B A0G is a 7.5 V zener diode rated for 500 mW power dissipation in a through-hole DO-35 package. Manufactured by Taiwan Semiconductor Corporation, this component is classified as Active and RoHS3 compliant. The device operates with a nominal zener voltage of 7.5 V at ±5% tolerance and is designed for voltage regulation and protection applications in electronic circuits.

Substitute parts become necessary when the primary manufacturer part is unavailable, when alternative compliance certifications are required, or when inventory constraints necessitate sourcing from alternative manufacturers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	7.5	V
Tolerance	±5	%
Power - Max	500	mW
Impedance (Max)	6	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 6 V
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 200 mA
Operating Temperature	100	°C (TJ)
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
RoHS Status	RoHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 1N5236B A0G zener diode is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 7.5 V
Tolerance: ±5%
Power - Max: 500 mW
Mounting Type: Through Hole
Package / Case: DO-35 (DO-204AH)

Secondary Compatibility Parameters:

Impedance (Max): 6 Ohms (maximum allowable variation)
Current - Reverse Leakage @ Vr: 3 µA @ 6 V (maximum allowable)
Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 200 mA (maximum allowable)

Parts are classified as direct substitutes when all primary criteria and secondary parameters remain within specified limits. Parts with variations in secondary parameters are classified as similar substitutes and require circuit-level evaluation for compatibility.

Parameter Comparison

Parameter	1N5236B A0G (Taiwan Semiconductor)	1N5236B (Microchip Technology)	1N5236BTR (Fairchild Semiconductor)	BZX79C7V5-T50A (Fairchild Semiconductor)
Voltage - Zener (Nom)	7.5 V	7.5 V	7.5 V	7.5 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	6 Ohms	6 Ohms	6 Ohms	15 Ohms
Current - Reverse Leakage @ Vr	3 µA @ 6 V	3 µA @ 6 V	3 µA @ 6 V	1 µA @ 5 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.5 V @ 200 mA	1.2 V @ 200 mA	1.5 V @ 100 mA
Operating Temperature	100°C (TJ)	-65°C ~ 175°C (TJ)	-65°C ~ 200°C	-65°C ~ 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
RoHS Status	RoHS3 Compliant	RoHS non-compliant	Not specified	Not specified

Engineering Selection Recommendations

Direct Substitutes (Electrical and Mechanical Equivalence):

The 1N5236B manufactured by Microchip Technology and the 1N5236BTR manufactured by Fairchild Semiconductor are direct substitutes for the 1N5236B A0G. Both parts maintain identical zener voltage (7.5 V), tolerance (±5%), power rating (500 mW), impedance (6 Ohms), reverse leakage current (3 µA @ 6 V), and through-hole DO-35 packaging.

The 1N5236B (Microchip) exhibits a forward voltage of 1.5 V @ 200 mA, which exceeds the 1.1 V specification of the primary part. The 1N5236BTR (Fairchild) specifies 1.2 V @ 200 mA, which also exceeds the primary specification. Both parts remain functionally compatible within standard circuit applications.

The 1N5236B (Microchip) is RoHS non-compliant, whereas the primary part is RoHS3 compliant. Applications requiring RoHS3 compliance must use the 1N5236BTR (Fairchild) or the primary part.

Similar Substitutes (Parameter Variations):

The BZX79C7V5-T50A manufactured by Fairchild Semiconductor is a similar substitute with parameter variations. This part maintains the 7.5 V zener voltage, ±5% tolerance, 500 mW power rating, and through-hole DO-35 packaging. However, the impedance is specified at 15 Ohms (maximum), which exceeds the 6 Ohms specification of the primary part. The reverse leakage current is 1 µA @ 5 V, which is lower than the 3 µA @ 6 V specification. The forward voltage is 1.5 V @ 100 mA, measured at a different current level than the primary specification.

The BZX79C7V5-T50A is suitable for applications where the higher impedance and lower leakage current do not create circuit performance constraints.

Compliance Considerations:

For applications requiring RoHS3 compliance, the 1N5236BTR (Fairchild Semiconductor) is the recommended substitute. For applications without RoHS compliance requirements, all substitute parts are electrically compatible.

Frequently Asked Questions (FAQ)

Q: Can the 1N5236B (Microchip Technology) replace the 1N5236B A0G in a RoHS3-compliant application?

A: No. The 1N5236B (Microchip Technology) is RoHS non-compliant, whereas the primary part is RoHS3 compliant. For RoHS3-compliant applications, use the 1N5236BTR (Fairchild Semiconductor).

Q: What is the significance of the forward voltage difference between the primary part (1.1 V @ 200 mA) and the substitute parts (1.2 V to 1.5 V @ 200 mA)?

A: The forward voltage specification applies to the diode in forward-biased operation. In typical zener diode applications, the device operates in reverse-biased mode for voltage regulation. Forward voltage differences are not critical for standard voltage regulation circuits. Circuit-level evaluation is necessary only if the application includes forward-biased operation of the zener diode.

Q: Is the BZX79C7V5-T50A a direct substitute for the 1N5236B A0G?

A: The BZX79C7V5-T50A is a similar substitute, not a direct substitute. It maintains the same zener voltage, tolerance, power rating, and package, but specifies higher impedance (15 Ohms vs. 6 Ohms) and lower reverse leakage current (1 µA @ 5 V vs. 3 µA @ 6 V). The higher impedance may affect circuit performance in applications with stringent voltage regulation requirements.

Q: Are all substitute parts available in the same DO-35 through-hole package?

A: Yes. All substitute parts are specified for DO-204AH, DO-35, and Axial package configurations. The through-hole mounting type is identical across all parts, ensuring mechanical compatibility in PCB designs.

Q: What is the operating temperature range difference between the primary part and substitute parts?

A: The primary part (1N5236B A0G) specifies a maximum junction temperature of 100°C. The 1N5236B (Microchip) specifies -65°C to 175°C, and both Fairchild parts specify -65°C to 200°C. For applications operating near or above 100°C, the substitute parts provide extended temperature capability.

Q: Can I use the BZX79C7V5-T50A in place of the 1N5236B A0G without circuit modifications?

A: The BZX79C7V5-T50A is electrically compatible for most standard voltage regulation applications. However, the higher impedance (15 Ohms vs. 6 Ohms) may result in slightly different voltage regulation characteristics under varying load conditions. Circuit-level analysis is required to confirm performance equivalence in applications with tight voltage regulation tolerances.

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