Equivalent & Substitute Parts for ZPY9V1-TAP Zener Diode

Part Overview

The ZPY9V1-TAP is a 9.1 V Zener diode rated at 1.3 W maximum power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This through-hole component operates in the DO-204AL (DO-41) package and is qualified to AEC-Q101 automotive standards. The part is currently active in production with 622 pieces in stock. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility is required while maintaining electrical and mechanical compatibility within specified tolerances.

Substiute Parts

ZPY9V1-TAP

Vishay General Semiconductor - Diodes DivisionIn Stock: 670ZPY9V1-TAP Datasheet

Current PartRFQ

1N4739A-TAP

Vishay General Semiconductor - Diodes DivisionIn Stock: 352041N4739A-TAP Datasheet

DirectRFQ

1N4739ATR

Fairchild SemiconductorIn Stock: 362751N4739ATR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of Zener diodes is determined by strict equivalence in the following parameters:

Critical Parameters (Must Match):

• Voltage - Zener (Nominal): 9.1 V
• Tolerance: ±5%
• Package / Case: DO-204AL (DO-41), Axial
• Mounting Type: Through Hole

Allowable Variation Parameters:

• Power - Maximum: Substitute must equal or exceed 1.3 W
• Impedance (Maximum): Substitute must not exceed 5 Ohms
• Current - Reverse Leakage: Substitute specifications are acceptable within automotive-grade performance
• Operating Temperature: Substitute must support minimum 175°C operation

Compliance Requirements:

• Grade: Automotive
• Qualification: AEC-Q101
• RoHS Status: ROHS3 Compliant

The substitute parts listed below meet all critical parameters and allowable variation criteria, ensuring functional and mechanical compatibility with the ZPY9V1-TAP in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

1N4739A-TAP (Vishay General Semiconductor - Diodes Division)

The 1N4739A-TAP is a direct functional equivalent to the ZPY9V1-TAP. Both components are manufactured by Vishay, share identical nominal Zener voltage (9.1 V) and power rating (1.3 W), and carry AEC-Q101 automotive qualification with ROHS3 compliance. The primary difference is packaging format: 1N4739A-TAP is supplied in Cut Tape (CT) format with 35,100 pieces in stock, compared to the main part's Tape & Box (TB) format. This substitute is suitable for applications where packaging format flexibility is acceptable and higher inventory availability is advantageous.

1N4739ATR (Fairchild Semiconductor)

The 1N4739ATR maintains the critical 9.1 V nominal Zener voltage and ±5% tolerance specification. However, this part differs in the following aspects: maximum power rating is 1 W (versus 1.3 W for the main part), operating temperature range extends to -65°C ~ 200°C (broader than the main part's 175°C specification), and automotive-grade qualification and AEC-Q101 certification are not documented in the provided parameters. This substitute is applicable only in applications where the 1 W power dissipation limit is sufficient and automotive qualification is not a design requirement. The Bulk packaging format provides 36,200 pieces in stock.

Selection Criteria:

• For automotive applications requiring AEC-Q101 qualification: Use 1N4739A-TAP
• For applications where power dissipation approaches or exceeds 1 W: Use 1N4739A-TAP
• For non-automotive applications with power dissipation ≤ 1 W: 1N4739ATR is acceptable
• For packaging format requirements: Verify compatibility with assembly equipment specifications

Frequently Asked Questions (FAQ)

Q: Can 1N4739A-TAP replace ZPY9V1-TAP in automotive applications?

A: Yes. Both parts are manufactured by Vishay, carry AEC-Q101 automotive qualification, and share identical electrical specifications: 9.1 V nominal Zener voltage, ±5% tolerance, 1.3 W maximum power, and DO-204AL (DO-41) through-hole package. The only difference is packaging format (Cut Tape versus Tape & Box).

Q: What is the difference between 1N4739A-TAP and 1N4739ATR?

A: Both parts have 9.1 V nominal Zener voltage and ±5% tolerance. Key differences: 1N4739A-TAP is rated 1.3 W (Vishay, AEC-Q101 qualified), while 1N4739ATR is rated 1 W (Fairchild, automotive qualification not specified). 1N4739ATR has a broader operating temperature range (-65°C ~ 200°C) compared to 1N4739A-TAP (175°C).

Q: Can I use 1N4739ATR in place of ZPY9V1-TAP?

A: Substitution depends on application requirements. If the circuit requires 1.3 W power dissipation capability, 1N4739ATR is not suitable due to its 1 W maximum rating. If the application requires automotive-grade AEC-Q101 qualification, 1N4739ATR does not meet this requirement based on provided specifications. Use 1N4739ATR only when power dissipation is ≤ 1 W and automotive qualification is not mandated.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the DO-204AL (DO-41) axial through-hole package with identical pin configuration and mechanical dimensions, enabling direct board-level substitution without layout modifications.

Q: What is the impedance difference between the main part and substitutes?

A: ZPY9V1-TAP has maximum impedance of 2 Ohms, while both 1N4739A-TAP and 1N4739ATR have maximum impedance of 5 Ohms. Higher impedance may affect circuit response characteristics in high-frequency or precision applications; verify impedance requirements for your specific circuit design.

Q: Do all parts meet RoHS compliance?

A: ZPY9V1-TAP and 1N4739A-TAP are both ROHS3 compliant. RoHS status for 1N4739ATR is not specified in the provided parameters; verify with the supplier if RoHS compliance is a design requirement.

Q: What is the reverse leakage current difference?

A: ZPY9V1-TAP specifies 500 nA reverse leakage at 7 V, while both 1N4739A-TAP and 1N4739ATR specify 10 µA at 7 V. The main part exhibits lower leakage current, which may be significant in low-power or precision analog circuits; evaluate circuit sensitivity to leakage current before substitution.