1N5266B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5266B is a 68 V, 500 mW Zener diode in DO-35 axial through-hole packaging manufactured by SMC Diode Solutions. This component is classified as obsolete, indicating discontinued production and limited availability from original sources. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications utilizing this Zener diode specification.

Substiute Parts

1N5266B

SMC Diode SolutionsIn Stock: 10171N5266B Datasheet

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1N5266B-TAP

Vishay General Semiconductor - Diodes DivisionIn Stock: 8351N5266B-TAP Datasheet

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1N5266B-TR

Vishay General Semiconductor - Diodes DivisionIn Stock: 731381N5266B-TR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N5266B is determined by electrical and mechanical parameter equivalence across the following criteria:

Electrical Parameters (Critical for Substitution):

• Zener voltage: 68 V nominal with ±5% tolerance
• Power dissipation: 500 mW maximum
• Impedance: 230 Ohms maximum
• Reverse leakage current: 100 nA at specified reverse voltage
• Forward voltage: 1.1 V maximum at 200 mA forward current

Mechanical Parameters (Critical for Substitution):

• Package type: DO-35 axial through-hole configuration
• Mounting: Through-hole assembly compatibility

Compliance Parameters:

• Moisture sensitivity: MSL 1 (Unlimited)
• REACH status: REACH Unaffected
• ECCN classification: EAR99

The substitute parts 1N5266B-TAP and 1N5266B-TR meet all electrical and mechanical requirements. Both are manufactured by Vishay General Semiconductor - Diodes Division and maintain identical electrical specifications. The primary differences are packaging format (Tape & Box versus Cut Tape) and product status (Active versus Obsolete).

Parameter Comparison

Engineering Selection Recommendations

1N5266B-TAP (Vishay, Tape & Box Packaging)

This substitute is suitable for applications requiring component delivery in tape and box format. The part maintains active product status with full AEC-Q101 automotive qualification and ROHS3 compliance. Operating temperature range extends to -65°C ~ 175°C, providing broader environmental coverage than the original 1N5266B. Inventory availability is 762 pieces.

1N5266B-TR (Vishay, Cut Tape Packaging)

This substitute is suitable for applications requiring component delivery in cut tape format. The part maintains active product status with full AEC-Q101 automotive qualification and ROHS3 compliance. Operating temperature range extends to -65°C ~ 175°C. Inventory availability is significantly higher at 73,098 pieces, supporting high-volume production requirements.

Selection Basis:

Both Vishay substitutes provide electrical equivalence to the 1N5266B across all critical parameters: 68 V zener voltage, 500 mW power rating, 230 Ohms impedance, and identical forward/reverse characteristics. The primary selection criterion is packaging format requirement. The 1N5266B-TR offers superior supply chain reliability due to higher inventory levels and active product status. Both parts carry automotive-grade qualification and RoHS3 compliance, exceeding the compliance profile of the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Are the 1N5266B-TAP and 1N5266B-TR electrically identical to the original 1N5266B?

A: Yes. Both substitute parts maintain identical electrical specifications: 68 V zener voltage, ±5% tolerance, 500 mW power dissipation, 230 Ohms maximum impedance, 100 nA reverse leakage current, and 1.1 V maximum forward voltage at 200 mA. All three parts are functionally equivalent for circuit applications.

Q: What is the difference between 1N5266B-TAP and 1N5266B-TR?

A: The primary difference is packaging format. The 1N5266B-TAP is supplied in Tape & Box (TB) format, while the 1N5266B-TR is supplied in Cut Tape (CT) format. Both are manufactured by Vishay and maintain identical electrical specifications. Selection depends on assembly line requirements and component handling procedures.

Q: Can I use these substitutes in existing designs without circuit modification?

A: Yes. The substitute parts are pin-compatible through-hole components in DO-35 axial packaging. No circuit modifications are required. Electrical performance is equivalent across all specified parameters.

Q: Why do the substitute parts have different operating temperature ranges?

A: The original 1N5266B specifies 200°C maximum operating temperature, while the Vishay substitutes specify -65°C ~ 175°C. The Vishay range represents standard automotive-grade specifications. For applications requiring the original 200°C specification, verify thermal requirements against actual circuit operating conditions.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both 1N5266B-TAP and 1N5266B-TR are ROHS3 compliant. The original 1N5266B does not specify RoHS status. Both substitutes meet current environmental compliance requirements.

Q: What is the inventory status for these parts?

A: The 1N5266B-TAP has 762 pieces in stock. The 1N5266B-TR has 73,098 pieces in stock. Both are active products with ongoing availability. The 1N5266B original part is obsolete with limited remaining inventory.

Q: Do these parts carry automotive qualification?

A: Yes. Both 1N5266B-TAP and 1N5266B-TR carry AEC-Q101 automotive qualification. The original 1N5266B does not specify automotive qualification. This represents an enhancement in the substitute parts.

Q: Can I mix packaging formats in the same production run?

A: Yes. Both the Tape & Box and Cut Tape formats contain electrically identical components. Mixing formats is permissible if assembly equipment can accommodate both packaging types. Verify with your assembly process specifications.