BZX55F3V9-TAP Equivalent & Substitute Parts

Part Overview

The BZX55F3V9-TAP is a 3.9 V Zener diode rated at 500 mW with ±1% tolerance, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as obsolete, though 792 pieces remain in stock as new original inventory. The part is housed in a DO-35 (DO-204AH) axial through-hole package and meets AEC-Q101 automotive qualification standards with ROHS3 compliance.

Due to the obsolete product status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and long-term component availability. Substitute parts listed below maintain the core electrical specifications while offering active product status and expanded availability.

Key Parameters

Parameter	BZX55F3V9-TAP
Voltage - Zener (Nom)	3.9 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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the BZX55F3V9-TAP is determined by the following core electrical and mechanical parameters:

Critical Matching Parameters:

Zener voltage: 3.9 V nominal
Power rating: 500 mW maximum
Package type: DO-35 (DO-204AH) through-hole axial configuration
Mounting: Through-hole technology

Tolerance Considerations: Substitute parts are grouped by voltage tolerance specification. The BZX55F3V9-TAP specifies ±1% tolerance. Substitutes with tighter tolerances (±1%, ±2%) provide direct functional equivalence. Substitutes with wider tolerances (±5%, ±10%) remain electrically compatible but with relaxed voltage accuracy specifications.

Impedance and Leakage Characteristics: Impedance values range from 23 to 1650 Ohms across the substitute group. Reverse leakage current specifications vary from 2 µA to 25 µA. These variations reflect different manufacturing processes and semiconductor materials but do not prevent functional substitution in standard voltage regulation applications.

Temperature and Compliance: All substitute parts maintain through-hole mounting and automotive-grade qualification where specified. Operating temperature ranges extend to 200°C for Central Semiconductor parts, providing enhanced thermal performance. RoHS3 compliance is maintained across Vishay and Central Semiconductor substitutes.

Parameter Comparison

Parameter	BZX55F3V9-TAP	BZX55B3V9-TAP	1N5228B BK PBFREE	1N5228B TR PBFREE	1N5990A	1N5990B	1N5990C	BZX79C3V9
Manufacturer	Vishay	Vishay	Central Semiconductor	Central Semiconductor	Microchip	Microchip	Microchip	Taiwan Semiconductor
Voltage - Zener (Nom)	3.9 V	3.9 V	3.9 V	3.9 V	3.9 V	3.9 V	3.9 V	3.9 V
Tolerance	±1%	±2%	±5%	±5%	±10%	±5%	±2%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	85 Ohms	90 Ohms	23 Ohms	23 Ohms	95 Ohms	90 Ohms	90 Ohms	90 Ohms
Current - Reverse Leakage @ Vr	2 µA @ 1 V	2 µA @ 1 V	10 µA @ 1 V	10 µA @ 1 V	25 µA @ 1 V	10 µA @ 1 V	10 µA @ 1 V	10 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.5 V @ 100 mA
Operating Temperature	175°C	-65°C ~ 175°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
Package / Case	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: BZX55B3V9-TAP

The BZX55B3V9-TAP is the direct Vishay equivalent with active product status. It maintains the same manufacturer lineage, automotive AEC-Q101 qualification, and ROHS3 compliance. The tolerance specification increases from ±1% to ±2%, representing a minimal deviation acceptable in standard voltage regulation circuits. Impedance increases marginally from 85 to 90 Ohms. This part offers 9,081 units in stock, ensuring production continuity.

Secondary Recommendation: 1N5990C

The 1N5990C from Microchip Technology provides ±2% tolerance matching the BZX55B3V9-TAP with identical impedance specification (90 Ohms). Active product status and 1,029 units in stock support long-term availability. Note that RoHS compliance status is non-compliant; this part is suitable for applications where RoHS3 compliance is not mandated.

Tertiary Recommendation: 1N5228B TR PBFREE

The 1N5228B TR PBFREE from Central Semiconductor offers the widest operating temperature range (-65°C to 200°C) and ROHS3 compliance. The ±5% tolerance and 23 Ohm impedance represent relaxed specifications but remain functionally compatible. Cut tape packaging and 7,768 units in stock provide excellent availability.

Alternative for Automotive Applications: BZX79C3V9

The BZX79C3V9 from Taiwan Semiconductor Corporation maintains AEC-Q101 automotive qualification and ROHS3 compliance with active product status. The ±5% tolerance and 90 Ohm impedance are consistent with other active substitutes. This part is suitable where automotive-grade certification is required.

Not Recommended: 1N4622-1

The 1N4622-1 from Microchip Technology uses a different package format (DO-7 instead of DO-35) and exhibits significantly higher impedance (1650 Ohms), making it unsuitable for direct substitution despite matching voltage and power specifications.

Frequently Asked Questions (FAQ)

Q: Can the BZX55F3V9-TAP be directly replaced with BZX55B3V9-TAP?

A: Yes. Both parts are manufactured by Vishay, share the same 3.9 V nominal voltage and 500 mW power rating, and use identical DO-35 through-hole packaging. The tolerance increases from ±1% to ±2%, which is acceptable in standard voltage regulation applications. The BZX55B3V9-TAP has active product status with significantly higher inventory availability.

Q: What is the difference between the 1N5990 series variants (1N5990A, 1N5990B, 1N5990C)?

A: The 1N5990 series differs by tolerance specification. The 1N5990A specifies ±10% tolerance, 1N5990B specifies ±5% tolerance, and 1N5990C specifies ±2% tolerance. All three maintain 3.9 V nominal voltage, 500 mW power rating, and DO-35 packaging. Selection depends on voltage accuracy requirements for the application.

Q: Are all substitute parts compatible with automotive applications?

A: Not all substitutes carry automotive qualification. The BZX55B3V9-TAP, BZX79C3V9, and the original BZX55F3V9-TAP maintain AEC-Q101 automotive qualification. The 1N5990 series and 1N5228B parts do not specify automotive qualification. Verify automotive requirements before selecting substitutes.

Q: What is the significance of the impedance differences across substitute parts?

A: Impedance values range from 23 Ohms (1N5228B series) to 1650 Ohms (1N4622-1). Lower impedance values provide better voltage regulation stability and faster transient response. Higher impedance values may introduce voltage ripple in sensitive applications. For standard voltage regulation, impedance values between 85 and 95 Ohms are functionally equivalent to the original BZX55F3V9-TAP.

Q: Can I use 1N5228B parts in place of BZX55F3V9-TAP?

A: Yes, with considerations. The 1N5228B maintains 3.9 V nominal voltage and 500 mW power rating in DO-35 packaging. However, the ±5% tolerance is wider than the original ±1% specification, and RoHS compliance status differs. The 1N5228B TR PBFREE variant offers ROHS3 compliance and extended operating temperature range (-65°C to 200°C), making it suitable for most applications.

Q: What packaging options are available for substitutes?

A: All recommended substitutes use DO-35 (DO-204AH) axial through-hole packaging, matching the original BZX55F3V9-TAP. Packaging variants include Cut Tape (CT) for the BZX55B3V9-TAP and 1N5228B TR PBFREE, and Tape & Reel (TR) for the BZX79C3V9. Bulk packaging is available for 1N4622-1, 1N5228B BK PBFREE, and the 1N5990 series. Select packaging based on production volume and handling requirements.

Q: Is RoHS3 compliance important for my application?

A: RoHS3 compliance is mandatory for products sold in the European Union and many other regulated markets. The BZX55B3V9-TAP, 1N5228B variants, and BZX79C3V9 are ROHS3 compliant. The 1N5990 series and 1N4622-1 are RoHS non-compliant. Verify regulatory requirements before selecting non-compliant substitutes.

Q: What is the difference between forward voltage specifications at different current levels?

A: Forward voltage (Vf) specifications vary by test current. The BZX55F3V9-TAP specifies 1.5 V @ 200 mA, while most substitutes specify 1.1 V @ 200 mA. The BZX79C3V9 specifies 1.5 V @ 100 mA. These differences reflect different semiconductor materials and manufacturing processes. For standard applications, forward voltage variations of this magnitude do not affect circuit performance.

Q: Can I substitute the BZX55F3V9-TAP with 1N4622-1?

A: No. Although both parts share 3.9 V nominal voltage and 500 mW power rating, the 1N4622-1 uses DO-7 packaging instead of DO-35, making it physically incompatible with existing PCB layouts. Additionally, the 1N4622-1 exhibits 1650 Ohm impedance, significantly higher than the original 85 Ohm specification, which may degrade voltage regulation performance.

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