ZPY16-TAP Equivalent & Substitute Parts

Part Overview

The ZPY16-TAP is a 16 V, 1.3 W Zener diode manufactured by Vishay General Semiconductor - Diodes Division in DO-204AL (DO-41) axial through-hole package. This component is classified as an active product with AEC-Q101 automotive qualification and ROHS3 compliance. The ZPY16-TAP is supplied in Tape & Box (TB) packaging format.

Equivalent and substitute parts are identified based on matching electrical specifications (nominal Zener voltage, power rating, and tolerance) and mechanical compatibility (package type and mounting configuration). Alternative sources and packaging formats are available to support procurement flexibility, inventory management, and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	16	V
Tolerance	±5	%
Power - Max	1.3	W
Impedance (Max)	5	Ohms
Current - Reverse Leakage @ Vr	500 nA @ 12 V	nA
Operating Temperature	175	°C
Package / Case	DO-204AL, DO-41, Axial	-
Mounting Type	Through Hole	-
Grade	Automotive	-
Qualification	AEC-Q101	-

Substitute Part Grouping Explanation

Substitution eligibility for the ZPY16-TAP is determined by the following critical parameters:

Electrical Compatibility Requirements:

Nominal Zener voltage: 16 V (exact match required)
Tolerance: ±5% (exact match required)
Power rating: 1.3 W or greater (equal or higher acceptable)
Package type: DO-204AL / DO-41 axial through-hole (exact match required)
Mounting type: Through Hole (exact match required)

Compliance & Qualification:

RoHS3 compliance required for direct substitution
AEC-Q101 automotive qualification preferred for automotive applications
REACH compliance status: REACH Unaffected (acceptable for all substitutes)

Substitute parts are grouped into two categories:

Category 1: Direct Electrical & Mechanical Equivalents (Vishay Automotive Grade) Parts meeting all electrical specifications, automotive qualification, and identical power rating (1.3 W). These include 1N4745A-TAP and BZX85C16-TAP, both supplied by Vishay with AEC-Q101 certification.

Category 2: Functional Equivalents with Reduced Power Rating (1 W) Parts meeting nominal voltage, tolerance, and package requirements but with 1 W maximum power rating instead of 1.3 W. These include 1N4745A (Lumimax), 1N4745A-T50A (onsemi), 1N4745ATR (Fairchild), and BZX85C16 (Taiwan Semiconductor). These parts are suitable for applications where the 1.3 W rating is not required.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Impedance (Max)	Reverse Leakage @ Vr	Package	AEC-Q101	RoHS3
ZPY16-TAP	Vishay	16 V	±5%	1.3 W	5 Ohms	500 nA @ 12 V	DO-41	Yes	Yes
1N4745A-TAP	Vishay	16 V	±5%	1.3 W	16 Ohms	DO-41	Yes	Yes
BZX85C16-TAP	Vishay	16 V	±5%	1.3 W	15 Ohms	DO-41	Yes	Yes
1N4745A	Lumimax	16 V	±5%	1 W	16 Ohms	DO-41	No	Yes
1N4745A-T50A	onsemi	16 V	±5%	1 W	16 Ohms	DO-41	No	Yes
1N4745ATR	Fairchild	16 V	±5%	1 W	16 Ohms	DO-41	No	No
BZX85C16	Taiwan Semiconductor	16 V	±5%	1.3 W	15 Ohms	DO-41	No	Yes

Engineering Selection Recommendations

For Automotive Applications with AEC-Q101 Requirement:

Select 1N4745A-TAP or BZX85C16-TAP. Both parts are manufactured by Vishay, hold AEC-Q101 automotive qualification, maintain the 1.3 W power rating, and are ROHS3 compliant. These parts provide direct functional equivalence to the ZPY16-TAP with identical electrical performance and regulatory compliance.

For Non-Automotive Applications or Where 1 W Power Rating is Sufficient:

The 1N4745A (Lumimax), 1N4745A-T50A (onsemi), and BZX85C16 (Taiwan Semiconductor) are acceptable alternatives. These parts meet the 16 V nominal voltage and ±5% tolerance requirements with ROHS3 compliance. The 1 W power rating is suitable for applications not requiring the full 1.3 W dissipation capability.

Packaging Considerations:

The ZPY16-TAP is supplied in Tape & Box (TB) format. The 1N4745A-TAP and BZX85C16-TAP are supplied in Cut Tape (CT) format, suitable for automated assembly. The 1N4745ATR is supplied in Bulk format. Packaging selection depends on production volume and assembly equipment compatibility.

Impedance Variation:

The ZPY16-TAP specifies 5 Ohms maximum impedance. Substitute parts specify 15 to 16 Ohms maximum impedance. This variation is within acceptable limits for standard Zener diode applications but should be verified for circuits with stringent impedance requirements.

Frequently Asked Questions (FAQ)

Q: Can 1N4745A-TAP be used as a direct replacement for ZPY16-TAP?

A: Yes. The 1N4745A-TAP is a direct substitute. Both parts share identical nominal Zener voltage (16 V), tolerance (±5%), power rating (1.3 W), package type (DO-41), and AEC-Q101 automotive qualification. The primary difference is packaging format (Cut Tape vs. Tape & Box).

Q: What is the difference between the 1.3 W and 1 W power-rated versions?

A: The ZPY16-TAP, 1N4745A-TAP, and BZX85C16-TAP are rated for 1.3 W maximum power dissipation. The 1N4745A (Lumimax), 1N4745A-T50A (onsemi), 1N4745ATR (Fairchild), and BZX85C16 (Taiwan Semiconductor) are rated for 1 W. The 1 W versions are suitable for applications where power dissipation does not exceed 1 W. For applications requiring the full 1.3 W capability, use the 1.3 W rated parts.

Q: Is AEC-Q101 qualification required for my application?

A: AEC-Q101 qualification is required for automotive applications. The ZPY16-TAP, 1N4745A-TAP, and BZX85C16-TAP hold this qualification. If your application is non-automotive, parts without AEC-Q101 qualification are acceptable provided they meet electrical and compliance requirements.

Q: What does the impedance specification mean, and why does it vary between parts?

A: Impedance (Zzt) is the dynamic impedance of the Zener diode in the reverse-biased region. The ZPY16-TAP specifies 5 Ohms maximum, while most substitutes specify 15 to 16 Ohms maximum. Lower impedance provides better voltage regulation. For standard applications, the higher impedance of substitute parts is acceptable. For precision voltage regulation circuits, verify impedance requirements against application specifications.

Q: Can I use BZX85C16 (Taiwan Semiconductor) instead of BZX85C16-TAP (Vishay)?

A: Both parts are electrically equivalent 16 V, 1.3 W Zener diodes in DO-41 package with ±5% tolerance. The primary difference is manufacturer (Taiwan Semiconductor vs. Vishay) and packaging format (Tape & Reel vs. Cut Tape). Verify that your procurement and assembly processes support the Taiwan Semiconductor source and Tape & Reel packaging.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant except 1N4745ATR (Fairchild), which is listed as RoHS compliant without specific ROHS3 designation. For applications requiring ROHS3 compliance, use ZPY16-TAP, 1N4745A-TAP, BZX85C16-TAP, 1N4745A (Lumimax), 1N4745A-T50A (onsemi), or BZX85C16 (Taiwan Semiconductor).

Q: What is the operating temperature range for each part?

A: The ZPY16-TAP specifies 175°C maximum operating temperature. The 1N4745A (Lumimax), 1N4745A-T50A (onsemi), 1N4745ATR (Fairchild), and BZX85C16 (Taiwan Semiconductor) specify -65°C to 200°C operating temperature range. The BZX85C16-TAP (Vishay) specifies 175°C maximum. Verify operating temperature requirements for your application.

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