BZX55F3V3-TAP Equivalent & Substitute Parts

Part Overview

The BZX55F3V3-TAP is a 3.3 V Zener diode rated at 500 mW with ±1% tolerance, manufactured by Vishay General Semiconductor - Diodes Division in a through-hole DO-35 package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters. Substitute parts are selected based on matching nominal Zener voltage, power dissipation rating, package type, and mounting configuration.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±1%	—
Power - Max	500	mW
Impedance (Max)	85	Ohms
Current - Reverse Leakage @ Vr	2	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
Operating Temperature	175	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the BZX55F3V3-TAP is determined by the following critical parameters:

Primary Matching Criteria:

Nominal Zener voltage: 3.3 V
Maximum power dissipation: 500 mW
Mounting type: Through Hole
Package type: DO-35 (DO-204AH) or compatible axial configuration

Secondary Compatibility Factors:

Tolerance range (±1% to ±5% acceptable within circuit design margins)
Impedance (Zzt) variation (24 to 95 Ohms)
Reverse leakage current (2 to 25 µA @ 1 V)
Forward voltage (Vf) at 200 mA (1.1 to 1.5 V)
Operating temperature range (-65°C to 200°C)

Compliance Considerations:

RoHS3 compliance status
AEC-Q101 automotive qualification
Product status (Active vs. Obsolete)

Substitute parts meeting these criteria are functionally equivalent for standard voltage regulation and transient suppression applications.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Status	RoHS
BZX55F3V3-TAP	Vishay	3.3 V	±1%	500 mW	85 Ω	1.5 V @ 200 mA	–/175°C	DO-35	Obsolete	ROHS3
BZX55B3V3-TAP	Vishay	3.3 V	±2%	500 mW	90 Ω	1.5 V @ 200 mA	-65/175°C	DO-35	Active	ROHS3
1N3506A	Microchip	3.3 V	±5%	500 mW	24 Ω	1.1 V @ 200 mA	-65/175°C	DO-35	Active	Non-compliant
1N4620-1	Microchip	3.3 V	±5%	500 mW	1650 Ω	1.1 V @ 200 mA	-65/175°C	DO-7	Active	Non-compliant
1N5226BTR	Fairchild	3.3 V	±5%	500 mW	28 Ω	1.2 V @ 200 mA	-65/200°C	DO-35	Active	—
1N5988B	Microchip	3.3 V	±5%	500 mW	95 Ω	1.1 V @ 200 mA	-65/175°C	DO-35	Active	Non-compliant
1N5988C	Microchip	3.3 V	±2%	500 mW	95 Ω	1.1 V @ 200 mA	-65/175°C	DO-35	Active	Non-compliant
BZX79C3V3	Taiwan Semiconductor	3.3 V	±5%	500 mW	95 Ω	1.5 V @ 100 mA	-65/175°C	DO-35	Active	ROHS3
BZX79C3V3-T50A	Fairchild	3.3 V	±5%	500 mW	95 Ω	1.5 V @ 100 mA	-65/200°C	DO-35	Active	—

Engineering Selection Recommendations

Primary Recommendation: BZX55B3V3-TAP

The BZX55B3V3-TAP is the direct successor from the same manufacturer (Vishay). It maintains identical electrical specifications (3.3 V, 500 mW, DO-35 package) with relaxed tolerance (±2% vs. ±1%), expanded operating temperature range (-65°C to 175°C), and active product status. RoHS3 compliance is maintained. This part provides the highest compatibility with the obsolete BZX55F3V3-TAP.

Secondary Recommendation: BZX79C3V3

The BZX79C3V3 from Taiwan Semiconductor Corporation offers identical nominal voltage, power rating, and package configuration. RoHS3 compliance is confirmed. Impedance and reverse leakage characteristics are within acceptable ranges for standard applications. Product status is active with adequate inventory.

Alternative Options: 1N5226BTR, 1N5988B, 1N5988C, BZX79C3V3-T50A

These parts meet core electrical requirements (3.3 V, 500 mW, DO-35 package, through-hole mounting) and are actively manufactured. Selection among these alternatives depends on specific circuit requirements regarding tolerance, impedance, and temperature range. Note that 1N5988B, 1N5988C, and 1N3506A are RoHS non-compliant; use only where RoHS compliance is not mandated.

Package Consideration: 1N4620-1

The 1N4620-1 uses a DO-7 package instead of DO-35. This part is electrically equivalent but physically incompatible with DO-35 footprints. Use only if PCB layout accommodates DO-7 axial leads.

Frequently Asked Questions (FAQ)

Q: Can BZX55B3V3-TAP directly replace BZX55F3V3-TAP?

A: Yes. Both parts share identical nominal Zener voltage (3.3 V), power rating (500 mW), and DO-35 package. The BZX55B3V3-TAP has relaxed tolerance (±2% vs. ±1%) and expanded temperature range, making it a direct functional equivalent. Both are Vishay products with AEC-Q101 qualification.

Q: What is the difference between DO-35 and DO-7 packages?

A: DO-35 (DO-204AH) and DO-7 (DO-204AA) are both axial through-hole packages but have different physical dimensions. DO-35 is smaller and more compact. The 1N4620-1 uses DO-7 and is not mechanically compatible with DO-35 PCB footprints without layout modification.

Q: Does tolerance affect substitution?

A: Tolerance differences (±1%, ±2%, ±5%) affect voltage regulation precision. The BZX55F3V3-TAP specifies ±1% tolerance. Substitutes with ±2% or ±5% tolerance are acceptable for applications with wider voltage margins. For precision voltage reference circuits, select parts with ±1% or ±2% tolerance (BZX55B3V3-TAP or 1N5988C).

Q: Are RoHS non-compliant parts acceptable?

A: RoHS compliance is mandatory in many jurisdictions and industries. Parts marked as RoHS non-compliant (1N3506A, 1N5988B, 1N5988C) are suitable only for applications where RoHS compliance is not required. For new designs, prioritize RoHS3-compliant alternatives (BZX55B3V3-TAP, BZX79C3V3).

Q: What is the significance of impedance (Zzt) variation?

A: Impedance affects transient response and voltage regulation quality. Lower impedance (24 Ω for 1N3506A) provides faster response to current changes. Higher impedance (1650 Ω for 1N4620-1) results in slower response. For standard applications, impedance values between 24 and 95 Ohms are functionally equivalent. High-impedance parts (>1000 Ω) are suitable only for low-frequency or low-speed transient suppression.

Q: Can I use a substitute with a higher operating temperature range?

A: Yes. Parts rated to -65°C to 200°C (1N5226BTR, BZX79C3V3-T50A) provide extended thermal capability compared to the original -65°C to 175°C specification. This is a beneficial upgrade for applications in high-temperature environments.

Q: What inventory considerations apply?

A: BZX55B3V3-TAP (30,287 pcs), BZX79C3V3-T50A (36,095 pcs), and 1N5226BTR (55,759 pcs) have substantial inventory availability. Parts with lower inventory (1N3506A: 717 pcs, 1N5988B: 797 pcs, 1N5988C: 733 pcs) may have longer lead times or supply constraints.

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