Equivalent & Substitute Parts for ZPY30-TR Zener Diode

Part Overview

The ZPY30-TR is a 30 V, 1.3 W Zener diode manufactured by Vishay General Semiconductor - Diodes Division, housed in a DO-204AL (DO-41) axial through-hole package. This component is classified as an automotive-grade diode with AEC-Q101 qualification and is currently active in production with 1896 units in stock. Zener diodes are essential voltage regulation and protection components in electronic circuits. Identifying equivalent and substitute parts is necessary when the primary part number becomes unavailable, when alternative packaging formats are required, or when sourcing from multiple suppliers is strategically beneficial.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	30	V
Tolerance	±5%	-
Power - Maximum	1.3	W
Impedance (Maximum)	10	Ohms
Current - Reverse Leakage @ Vr	500 nA @ 22.5 V	-
Operating Temperature	175	°C
Grade	Automotive	-
Qualification	AEC-Q101	-
Package / Case	DO-204AL (DO-41)	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the ZPY30-TR is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 30 V (nominal)
Voltage tolerance: ±5%
Package type: DO-204AL (DO-41) axial through-hole
Mounting type: Through-hole

Secondary Compatibility Parameters:

Power dissipation rating: 1.3 W or higher
Impedance (Zzt): Maximum 40 Ohms (allows for variation within acceptable circuit performance)
Reverse leakage current: Specified at similar voltage reference points
Operating temperature range: Minimum 175°C junction temperature
Compliance: RoHS3 compliant

Substitute parts are grouped into three categories based on their relationship to the main part:

Parametric Equivalent - Identical electrical specifications and packaging
Direct Manufacturer Substitute - Same manufacturer, alternative packaging designation
Cross-Manufacturer Equivalent - Different manufacturer, compatible electrical and mechanical specifications

Parameter Comparison

Parameter	ZPY30-TR	ZPY30-TAP	1N4751A-TAP	1N4751A	1N4751A-T50A	JANS1N4476
Manufacturer	Vishay	Vishay	Vishay	Lumimax	Fairchild	Semtech
Voltage - Zener (Nom)	30 V	30 V	30 V	30 V	30 V	30 V
Tolerance	±5%	±5%	±5%	±5%	±5%	±5%
Power - Max	1.3 W	1.3 W	1.3 W	1 W	1 W	1.5 W
Impedance (Max)	10 Ohms	10 Ohms	40 Ohms	40 Ohms	40 Ohms	20 Ohms
Reverse Leakage @ Vr	500 nA @ 22.5 V	500 nA @ 22.5 V	5 µA @ 22.8 V	5 µA @ 22.8 V	5 µA @ 22.8 V	50 nA @ 24 V
Operating Temperature	175°C	175°C	175°C (TJ)	-65°C ~ 200°C	-65°C ~ 200°C	-55°C ~ 175°C
Grade	Automotive	Automotive	Automotive	-	-	Military
Qualification	AEC-Q101	AEC-Q101	AEC-Q101	-	-	MIL-PRF-19500/406
Package / Case	DO-204AL (DO-41)	DO-204AL (DO-41)	DO-204AL (DO-41)	DO-204AL (DO-41)	DO-204AL (DO-41)	DO-204AL (DO-41)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	Not applicable	-
Product Status	Active	Active	Active	Active	Active	Discontinued

Engineering Selection Recommendations

Tier 1 - Preferred Substitutes (Highest Compatibility):

ZPY30-TAP is the primary parametric equivalent. It shares identical electrical specifications with the ZPY30-TR, including 30 V nominal voltage, ±5% tolerance, 1.3 W power rating, 10 Ohms maximum impedance, and 500 nA reverse leakage current. Both parts carry automotive-grade classification with AEC-Q101 qualification and are ROHS3 compliant. The only difference is packaging designation (TAP vs. TR cut tape format). This part is actively produced with 17,622 units in stock and is the recommended first choice for direct substitution.

Tier 2 - Compatible Substitutes (Acceptable with Circuit Verification):

1N4751A-TAP (Vishay) and 1N4751A-T50A (Fairchild) are cross-manufacturer equivalents with the same 30 V nominal voltage and ±5% tolerance. Both maintain automotive-grade AEC-Q101 qualification. However, these parts differ in power rating (1.3 W vs. 1 W) and impedance (10 Ohms vs. 40 Ohms). The higher impedance may affect circuit regulation characteristics in applications requiring low dynamic impedance. These substitutes are suitable for applications where the 1 W power rating is sufficient and impedance variation is acceptable.

1N4751A (Lumimax) provides equivalent electrical performance but lacks automotive-grade certification and AEC-Q101 qualification. This part is suitable only for non-automotive applications. Operating temperature range extends to 200°C, providing enhanced thermal margin.

Tier 3 - Limited Substitutes (Specialized Applications Only):

JANS1N4476 (Semtech) is a military-grade component with MIL-PRF-19500/406 qualification and superior reverse leakage performance (50 nA @ 24 V). Power rating is 1.5 W, exceeding the main part specification. However, this part is discontinued at DiGi Electronics and inventory is limited to 681 units. Use only when military-grade qualification is explicitly required and availability is confirmed.

Selection Logic:

For automotive applications requiring AEC-Q101 compliance: Select ZPY30-TAP or 1N4751A-TAP
For general-purpose applications without automotive requirements: 1N4751A (Lumimax) is acceptable
For military or high-reliability applications: JANS1N4476 if availability permits
Avoid substitution if circuit design depends on impedance values below 20 Ohms

Frequently Asked Questions (FAQ)

Q1: Can ZPY30-TAP directly replace ZPY30-TR without circuit modification?

A: Yes. ZPY30-TAP is a parametric equivalent with identical electrical specifications (30 V, ±5%, 1.3 W, 10 Ohms impedance) and the same automotive-grade AEC-Q101 qualification. The only difference is the packaging designation (TAP vs. TR cut tape format), which does not affect electrical performance or mechanical fit in DO-41 through-hole applications.

Q2: What is the difference between 1N4751A-TAP and 1N4751A-T50A?

A: Both parts share the same 30 V nominal voltage, ±5% tolerance, and AEC-Q101 automotive qualification. The primary differences are manufacturer (Vishay vs. Fairchild), power rating (1.3 W vs. 1 W), and impedance (10 Ohms vs. 40 Ohms). The 1N4751A-T50A has higher impedance, which may reduce regulation performance in circuits requiring low dynamic impedance. Select based on power dissipation requirements and impedance tolerance of the application.

Q3: Why does JANS1N4476 show as discontinued?

A: JANS1N4476 is discontinued at DiGi Electronics, though 681 units remain in stock. This military-grade part (MIL-PRF-19500/406) is no longer in active production. Use only when military qualification is mandatory and availability is confirmed through alternative distributors.

Q4: Can I use 1N4751A (Lumimax) in an automotive application?

A: No. The Lumimax 1N4751A lacks automotive-grade classification and AEC-Q101 qualification. It is suitable only for general-purpose and consumer applications. For automotive designs, use ZPY30-TAP, 1N4751A-TAP (Vishay), or 1N4751A-T50A (Fairchild), all of which carry AEC-Q101 certification.

Q5: What does impedance (Zzt) mean, and why does it vary between substitutes?

A: Impedance (Zzt) is the dynamic impedance of the Zener diode at the specified test current. Lower impedance (10 Ohms) provides better voltage regulation and faster transient response. Higher impedance (40 Ohms) may result in greater voltage ripple under load changes. ZPY30-TR and ZPY30-TAP both specify 10 Ohms, while 1N4751A variants specify 40 Ohms. Select based on circuit regulation requirements.

Q6: Are all substitute parts RoHS3 compliant?

A: ZPY30-TAP, 1N4751A-TAP, and 1N4751A are ROHS3 compliant. 1N4751A-T50A (Fairchild) shows "Not applicable" RoHS status. JANS1N4476 does not specify RoHS status. For applications requiring RoHS3 compliance, use ZPY30-TAP, 1N4751A-TAP, or 1N4751A.

Q7: What is the difference between DO-41 and DO-204AL packaging?

A: DO-41 and DO-204AL are equivalent designations for the same axial through-hole package. DO-204AL is the formal JEDEC designation, while DO-41 is the legacy industry designation. Both refer to identical physical dimensions and pin configurations suitable for through-hole PCB mounting.

Q8: Can I substitute a 1 W rated diode (1N4751A) for a 1.3 W rated diode (ZPY30-TR)?

A: Substitution is possible only if circuit power dissipation does not exceed 1 W. If the application requires the full 1.3 W dissipation capability, the 1 W rated substitute will overheat and fail. Verify actual power dissipation in the circuit before selecting a lower-rated substitute.

Q9: Why does reverse leakage current vary significantly between parts?

A: Reverse leakage current depends on semiconductor material quality, doping profile, and manufacturing process. JANS1N4476 (50 nA @ 24 V) has superior leakage performance due to military-grade manufacturing. ZPY30-TR (500 nA @ 22.5 V) and 1N4751A variants (5 µA @ 22.8 V) have higher leakage. For applications sensitive to leakage current, select parts with lower specified values.

Q10: Which substitute offers the best overall compatibility with ZPY30-TR?

A: ZPY30-TAP is the best overall substitute. It is manufactured by the same company (Vishay), carries identical electrical specifications, maintains automotive-grade AEC-Q101 qualification, and is actively produced with high inventory (17,622 units). It requires no circuit modification and provides drop-in compatibility.

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