ZPY24-TAP Zener Diode Equivalent & Substitute Parts

Part Overview

The ZPY24-TAP is a 24 V, 1.3 W Zener diode manufactured by Vishay General Semiconductor - Diodes Division, packaged in DO-204AL (DO-41) axial through-hole configuration with tape and box packaging. This component is classified as Active product status with AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain discontinuity, or application-specific packaging preferences while maintaining the same functional specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	24	V
Tolerance	±5%	-
Power - Max	1.3	W
Impedance (Max)	8	Ohms
Current - Reverse Leakage @ Vr	500 nA @ 18 V	-
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 is determined by strict alignment with the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 24 V (exact match required)
Tolerance: ±5% (exact match required)
Package / Case: DO-204AL, DO-41, Axial (mechanical compatibility)
Mounting Type: Through Hole (required for circuit board integration)

Secondary Compatibility Parameters:

Power - Max: Minimum 1.3 W (equal or greater acceptable)
Operating Temperature: Minimum 175°C (equal or greater acceptable)
Current - Reverse Leakage: Lower values indicate superior performance

Substitute parts are grouped into two categories based on power rating alignment:

Category A - Direct Electrical Equivalents (1.0 W to 1.3 W Power Rating): Parts with power ratings between 1.0 W and 1.3 W maintain functional equivalence within the original design envelope. These include 1N4749A-TAP, 1N4749A (Lumimax), 1N4749A-T50A (onsemi), and 1N4749ATR (Fairchild).

Category B - Enhanced Performance Substitutes (≥1.25 W Power Rating): Parts with power ratings of 1.25 W or greater provide superior thermal performance and current handling capacity. These include 1N5934BG (1.25 W) and 1N5934BRNG/1N5934BRLG (3 W).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Ir @ Vr	Temp Operating	Package	Packaging Type
ZPY24-TAP	Vishay	24 V	±5%	1.3 W	8 Ω	500 nA @ 18 V	175°C	DO-204AL (DO-41)	Tape & Box
1N4749A-TAP	Vishay	24 V	±5%	1.3 W	25 Ω	5 µA @ 18.2 V	175°C	DO-204AL (DO-41)	Cut Tape
1N4749A	Lumimax	24 V	±5%	1 W	25 Ω	5 µA @ 18.2 V	-65°C ~ 200°C	DO-41G	-
1N4749A-T50A	onsemi	24 V	±5%	1 W	25 Ω	5 µA @ 18.2 V	-65°C ~ 200°C	DO-204AL (DO-41)	Cut Tape
1N4749ATR	Fairchild	24 V	±5%	1 W	25 Ω	5 µA @ 18.2 V	-65°C ~ 200°C	DO-204AL (DO-41)	Bulk
1N5934BG	Microsemi	24 V	±5%	1.25 W	19 Ω	1 µA @ 18.2 V	-65°C ~ 175°C	DO-204AL (DO-41)	Bulk
1N5934BRNG	onsemi	24 V	±5%	3 W	19 Ω	1 µA @ 18.2 V	-65°C ~ 200°C	DO-204AL (DO-41)	-
1N5934BRLG	onsemi	24 V	±5%	3 W	19 Ω	1 µA @ 18.2 V	-65°C ~ 200°C	DO-204AL (DO-41) Axial	Cut Tape

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

The 1N4749A-TAP (Vishay, Cut Tape packaging) provides direct electrical equivalence with identical 24 V nominal voltage, ±5% tolerance, and 1.3 W power rating. This part maintains the same impedance and operating temperature specifications as the ZPY24-TAP. Selection is appropriate when tape packaging is acceptable and Vishay component continuity is required.

For Equivalent Performance with Extended Temperature Range:

The 1N4749A-T50A (onsemi) and 1N4749ATR (Fairchild) both deliver 24 V, ±5% tolerance specifications with extended operating temperature range (-65°C to 200°C). Power rating is 1 W, which is lower than the original 1.3 W specification. These parts are suitable for applications where the 1 W power dissipation envelope is sufficient and extended temperature performance is beneficial. Both parts maintain AEC-Q101 or equivalent automotive-grade qualification status.

For Enhanced Thermal Performance:

The 1N5934BRNG and 1N5934BRLG (onsemi, 3 W rating) provide superior power handling capacity at 24 V with ±5% tolerance. These parts are suitable for applications requiring higher current dissipation or thermal margin. The 1N5934BRLG offers Cut Tape packaging for automated assembly compatibility.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status. The 1N5934BG (Microsemi) is RoHS non-compliant and should be avoided in applications requiring RoHS certification.

Frequently Asked Questions (FAQ)

Q1: Can the 1N4749A-T50A (1 W) replace the ZPY24-TAP (1.3 W)?

A: The 1N4749A-T50A maintains identical 24 V nominal voltage and ±5% tolerance specifications. The 1 W power rating is lower than the original 1.3 W specification. Substitution is valid only when circuit design analysis confirms that maximum power dissipation does not exceed 1 W under all operating conditions. Verify thermal requirements before selection.

Q2: What is the difference between 1N5934BRNG and 1N5934BRLG?

A: Both parts are manufactured by onsemi with identical electrical specifications: 24 V nominal voltage, ±5% tolerance, 3 W power rating, and 19 Ω maximum impedance. The primary difference is packaging: 1N5934BRNG is supplied in standard DO-41 format, while 1N5934BRLG is supplied in Cut Tape (CT) format suitable for automated pick-and-place assembly. Electrical performance is identical.

Q3: Why does the ZPY24-TAP have lower impedance (8 Ω) compared to substitute parts (19-25 Ω)?

A: Impedance variation is a characteristic of different manufacturing processes and internal device design. Lower impedance indicates superior dynamic response characteristics. However, all parts meet the 24 V ±5% voltage regulation requirement. Impedance differences do not prevent functional substitution in standard voltage regulation applications.

Q4: Is the Lumimax 1N4749A suitable for automotive applications?

A: The Lumimax 1N4749A does not carry AEC-Q101 qualification designation in the provided specifications. The original ZPY24-TAP carries AEC-Q101 automotive qualification. For applications requiring automotive-grade components, select substitutes with documented AEC-Q101 qualification or equivalent automotive certification.

Q5: Can I use the 1N5934BG (Microsemi) in a new design?

A: The 1N5934BG is RoHS non-compliant. If your application or customer requirements mandate RoHS3 compliance, this part is not suitable. Select ROHS3-compliant alternatives such as 1N4749A-TAP, 1N4749A-T50A, 1N4749ATR, 1N5934BRNG, or 1N5934BRLG.

Q6: What packaging options are available for automated assembly?

A: Cut Tape (CT) packaging is available for automated pick-and-place assembly: 1N4749A-TAP (Vishay), 1N4749A-T50A (onsemi), and 1N5934BRLG (onsemi). Bulk and Tape & Box packaging require manual handling or reel-based feeding systems.

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