1N5226B A0G Equivalent & Substitute Parts

Part Overview

The 1N5226B A0G is a Zener diode rated at 3.3 V nominal voltage with 500 mW power dissipation capacity, packaged in the DO-35 (DO-204AH) through-hole configuration. Manufactured by Taiwan Semiconductor Corporation, this component is classified as Active and RoHS3 compliant. Alternative equivalent parts are necessary when the primary manufacturer part is unavailable, when specific compliance requirements differ, or when inventory constraints require sourcing from alternative suppliers while maintaining identical electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	28 - 95	Ohms
Current - Reverse Leakage @ Vr	25	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.1 - 1.5	V @ 100-200 mA
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-

Substitute Part Grouping Explanation

Substitution of the 1N5226B A0G is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Voltage - Zener (Nom): 3.3 V
Power - Max: 500 mW
Tolerance: ±5%
Mounting Type: Through Hole
Package / Case: DO-35 (DO-204AH)

Secondary Compatibility Parameters:

Current - Reverse Leakage @ Vr: 25 µA @ 1 V
Impedance (Max): 28 - 95 Ohms (acceptable range for this application category)
Voltage - Forward (Vf) (Max) @ If: 1.1 - 1.5 V (acceptable range)

Parts are classified as Direct equivalents when all primary criteria match exactly. Parts are classified as Similar when primary criteria match but secondary parameters show acceptable variation within the specified ranges. All substitute parts listed maintain identical zener voltage, power rating, tolerance, and package configuration as the main part.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Operating Temp	RoHS Status	Product Status
1N5226B A0G	Taiwan Semiconductor Corporation	3.3 V	±5%	500 mW	28 Ω	1.1 V @ 200 mA	100°C (TJ)	ROHS3 Compliant	Active
1N5226B	Microchip Technology	3.3 V	±5%	500 mW	28 Ω	1.5 V @ 200 mA	-65°C ~ 175°C (TJ)	RoHS non-compliant	Active
1N5226BTR	Fairchild Semiconductor	3.3 V	±5%	500 mW	28 Ω	1.2 V @ 200 mA	-65°C ~ 200°C	Not specified	Active
BZX79C3V3	Taiwan Semiconductor Corporation	3.3 V	±5%	500 mW	95 Ω	1.5 V @ 100 mA	-65°C ~ 175°C (TJ)	ROHS3 Compliant	Active
BZX79C3V3-T50A	Fairchild Semiconductor	3.3 V	±5%	500 mW	95 Ω	1.5 V @ 100 mA	-65°C ~ 200°C	Not specified	Active

Engineering Selection Recommendations

Direct Equivalent Selection:

The 1N5226BTR (Fairchild Semiconductor) provides direct functional equivalence with identical primary specifications. This part maintains the 3.3 V zener voltage, 500 mW power rating, ±5% tolerance, and DO-35 package configuration. The 1N5226BTR offers an extended operating temperature range (-65°C ~ 200°C) compared to the main part, providing broader thermal performance capability. This part is suitable for applications requiring direct pin-for-pin and functional replacement.

The 1N5226B (Microchip Technology) also provides direct functional equivalence with identical electrical specifications. However, this variant is RoHS non-compliant, which may restrict its use in applications subject to RoHS3 regulatory requirements. Selection of this part requires verification of compliance requirements in the target application.

Similar Equivalent Selection:

The BZX79C3V3 (Taiwan Semiconductor Corporation) and BZX79C3V3-T50A (Fairchild Semiconductor) are classified as similar equivalents. These parts maintain identical zener voltage (3.3 V), power rating (500 mW), tolerance (±5%), and package configuration (DO-35). The impedance specification differs (95 Ω versus 28 Ω), and forward voltage characteristics vary slightly. These parts are functionally compatible for applications where the impedance and forward voltage variations fall within acceptable circuit tolerances.

The BZX79C3V3 maintains RoHS3 compliance and is manufactured by Taiwan Semiconductor Corporation, matching the original manufacturer. The BZX79C3V3-T50A extends the operating temperature range to -65°C ~ 200°C.

Compliance Considerations:

For applications requiring RoHS3 compliance, select either the 1N5226B A0G (original part), BZX79C3V3, or 1N5226BTR. The Microchip 1N5226B variant is RoHS non-compliant and should be avoided in regulated applications.

All listed parts maintain REACH Unaffected or REACH Affected status as specified. ECCN classification (EAR99) and HTSUS code (8541.10.0050) are consistent across all variants.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 1N5226B A0G with the Microchip 1N5226B?

A: The Microchip 1N5226B provides identical electrical specifications and package configuration. However, it is RoHS non-compliant, whereas the original part is RoHS3 compliant. Substitution is permissible only in applications where RoHS compliance is not required. The forward voltage specification differs slightly (1.5 V versus 1.1 V @ 200 mA), which may affect circuit performance in voltage-sensitive applications.

Q: What is the difference between the 1N5226BTR and BZX79C3V3 variants?

A: Both parts maintain the 3.3 V zener voltage, 500 mW power rating, and DO-35 package. The primary differences are impedance (28 Ω for 1N5226BTR versus 95 Ω for BZX79C3V3) and forward voltage characteristics. The 1N5226BTR is classified as a direct equivalent, while the BZX79C3V3 is classified as a similar equivalent. Selection depends on circuit impedance and forward voltage requirements.

Q: Are all substitute parts available in the same packaging format?

A: All listed substitute parts are packaged in DO-35 (DO-204AH) through-hole configuration, matching the original part. Packaging variants differ only in supplier delivery format (Bulk, Tape & Reel). The physical component package remains identical across all variants.

Q: Which substitute part offers the widest operating temperature range?

A: Both the 1N5226BTR (Fairchild Semiconductor) and BZX79C3V3-T50A (Fairchild Semiconductor) offer the extended operating temperature range of -65°C ~ 200°C, compared to the original part specification of 100°C (TJ). These variants are suitable for applications requiring operation across broader temperature extremes.

Q: Can I use the BZX79C3V3 as a direct replacement in all applications?

A: The BZX79C3V3 is classified as a similar equivalent rather than a direct equivalent due to impedance variation (95 Ω versus 28 Ω). While the zener voltage and power rating are identical, the higher impedance may affect circuit performance in applications sensitive to dynamic impedance characteristics. Circuit validation is necessary to confirm compatibility in impedance-critical applications.

Q: What compliance certifications should I verify before selecting a substitute part?

A: Verify RoHS compliance status based on application requirements. The original 1N5226B A0G, BZX79C3V3, and 1N5226BTR maintain appropriate compliance certifications. All parts are classified as EAR99 for export control purposes and share the same HTSUS code (8541.10.0050). REACH status varies between REACH Unaffected and REACH Affected; confirm applicability to your regulatory jurisdiction.

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