TZX3V9A-TAP Equivalent & Substitute Parts

Part Overview

The TZX3V9A-TAP is a 3.9 V Zener diode rated at 500 mW in a DO-35 through-hole package, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as an active product with automotive-grade qualification (AEC-Q101) and ROHS3 compliance. Substitute parts are necessary when the primary part is unavailable, when specific packaging formats are required, or when alternative compliance certifications are needed for particular applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	3.9	V
Power - Maximum	500	mW
Package / Case	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	—
Operating Temperature Range	-65°C to 175°C	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the TZX3V9A-TAP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nominal): 3.9 V (exact match required)
Power - Maximum: 500 mW (exact match required)
Package / Case: DO-204AH, DO-35, Axial (exact match required)
Mounting Type: Through Hole (exact match required)

Secondary Compatibility Parameters:

Operating Temperature Range: Minimum -65°C to 175°C (substitute must meet or exceed this range)
Tolerance: ±5% or better (substitute tolerance must not exceed ±5%)
Current - Reverse Leakage @ Vr: 10 µA @ 1 V or lower (substitute leakage must not exceed this value)
Voltage - Forward (Vf) (Max) @ If: Substitute must not exceed 1.5 V @ 200 mA

All substitute parts listed maintain the same nominal zener voltage, maximum power dissipation, and through-hole DO-35 package configuration. Variations in impedance, forward voltage, and leakage current are acceptable within the specified limits.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Power (Max)	Tolerance	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	RoHS Status
TZX3V9A-TAP	Vishay	3.9 V	500 mW	—	100 Ω	5 µA @ 1 V	1.5 V @ 200 mA	-65°C to 175°C	DO-35	ROHS3
1N5228B	Microchip Technology	3.9 V	500 mW	±5%	23 Ω	10 µA @ 1 V	1.5 V @ 200 mA	-65°C to 175°C	DO-35	RoHS non-compliant
1N5228B TR PBFREE	Central Semiconductor Corp	3.9 V	500 mW	±5%	23 Ω	10 µA @ 1 V	1.1 V @ 200 mA	-65°C to 200°C	DO-35	ROHS3
1N5228BTR	Fairchild Semiconductor	3.9 V	500 mW	±5%	23 Ω	10 µA @ 1 V	1.2 V @ 200 mA	-65°C to 200°C	DO-35	—
1N748A-1	Microchip Technology	3.9 V	500 mW	±5%	20 Ω	2 µA @ 1 V	1.1 V @ 200 mA	-65°C to 175°C	DO-35	RoHS non-compliant
BZX79C3V9	Taiwan Semiconductor Corporation	3.9 V	500 mW	±5%	90 Ω	10 µA @ 1 V	1.5 V @ 100 mA	-65°C to 175°C	DO-35	ROHS3
BZX79C3V9-T50A	onsemi	3.9 V	500 mW	±5%	90 Ω	10 µA @ 1 V	1.5 V @ 100 mA	-65°C to 200°C	DO-35	ROHS3

Engineering Selection Recommendations

Primary Substitute (Highest Compatibility): The 1N5228B TR PBFREE (Central Semiconductor Corp) is the preferred substitute when RoHS3 compliance is required. This part maintains the 3.9 V nominal zener voltage and 500 mW power rating while offering an extended operating temperature range (-65°C to 200°C) and improved forward voltage characteristics (1.1 V @ 200 mA). It is available in Cut Tape packaging.

Alternative Substitutes (Equivalent Electrical Performance): The 1N5228BTR (Fairchild Semiconductor) and BZX79C3V9-T50A (onsemi) both provide equivalent electrical performance with extended temperature ranges to 200°C. The BZX79C3V9-T50A offers ROHS3 compliance and is available in Cut Tape format with higher inventory levels (16,044 units).

Legacy Application Compatibility: The 1N748A-1 (Microchip Technology) is suitable for applications where lower reverse leakage current (2 µA @ 1 V) is beneficial, though it lacks RoHS3 compliance. The BZX79C3V9 (Taiwan Semiconductor Corporation) provides ROHS3 compliance with similar electrical characteristics to the main part.

Compliance Considerations: For automotive-grade applications requiring AEC-Q101 qualification, the TZX3V9A-TAP remains the specified component. Substitute parts should be evaluated against specific application compliance requirements, as not all substitutes carry automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can I substitute the TZX3V9A-TAP with any of the listed parts? A: All listed parts share the same nominal zener voltage (3.9 V), maximum power rating (500 mW), and DO-35 through-hole package. Electrical substitution is valid based on these core parameters. However, compliance certifications and operating temperature ranges differ; verify these against your application requirements.

Q: What is the difference between the 1N5228B and 1N5228B TR PBFREE? A: Both parts have identical electrical specifications (3.9 V, 500 mW, ±5% tolerance). The primary differences are: 1N5228B TR PBFREE is ROHS3 compliant and lead-free, operates to 200°C (versus 175°C), has lower forward voltage (1.1 V versus 1.5 V @ 200 mA), and is supplied in Cut Tape packaging. The standard 1N5228B is RoHS non-compliant.

Q: Why do some substitutes have different impedance values? A: Impedance (Zzt) variations reflect differences in internal diode construction and doping profiles between manufacturers. The TZX3V9A-TAP has 100 Ω impedance, while most substitutes range from 20 Ω to 90 Ω. These variations do not affect substitutability for standard voltage regulation applications, as all parts maintain the specified 3.9 V nominal zener voltage.

Q: Are there packaging format differences among the substitutes? A: Yes. The TZX3V9A-TAP is supplied in Tape & Box format. Substitutes are available in Bulk, Cut Tape, and Tape & Reel formats. All maintain the same DO-35 axial through-hole package configuration, so mechanical compatibility is preserved regardless of supply format.

Q: Which substitute has the lowest reverse leakage current? A: The 1N748A-1 has the lowest reverse leakage current at 2 µA @ 1 V, compared to 5 µA for the main part and 10 µA for most other substitutes. This characteristic may be advantageous in high-impedance circuit applications.

Q: Can I use these substitutes in automotive applications? A: The TZX3V9A-TAP carries AEC-Q101 automotive qualification. Substitute parts do not carry this certification. For automotive applications requiring AEC-Q101 compliance, the TZX3V9A-TAP is the specified component. Substitutes may be used in non-automotive or non-safety-critical applications.

Q: What is the temperature range difference between parts? A: The TZX3V9A-TAP and most substitutes operate from -65°C to 175°C. Three substitutes extend to 200°C: 1N5228B TR PBFREE, 1N5228BTR, and BZX79C3V9-T50A. Select the extended-range parts if your application requires operation above 175°C.

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