BZX55F2V7-TAP Equivalent & Substitute Parts

Part Overview

The BZX55F2V7-TAP is a Zener diode rated at 2.7 V, 500 mW with ±1% tolerance, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as obsolete, though 983 pieces remain in stock. The part is qualified to AEC-Q101 automotive standards and is housed in a DO-35 (DO-204AH) axial through-hole package.

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 improved availability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	2.7	V
Tolerance	±1%	—
Power - Max	500	mW
Impedance (Max)	85	Ohms
Current - Reverse Leakage @ Vr	10	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 BZX55F2V7-TAP is determined by the following critical parameters:

Electrical Specifications:

Zener voltage: 2.7 V nominal
Power dissipation: 500 mW maximum
Package type: DO-35 (DO-204AH) axial through-hole
Mounting configuration: Through-hole

Tolerance Considerations: The main part specifies ±1% tolerance. Substitute parts are grouped into tolerance classes: ±1%, ±2%, and ±5%. Parts with tighter tolerances (±1% or ±2%) are direct functional equivalents. Parts with ±5% tolerance introduce wider voltage variation and are suitable only where circuit design accommodates this deviation.

Compliance & Qualification: Automotive-grade (AEC-Q101) and military-grade (MIL-PRF-19500/127) qualifications are noted where applicable. RoHS compliance status is documented for each substitute.

Impedance & Leakage: Impedance values range from 30 to 100 Ohms across substitutes. Reverse leakage current varies from 10 µA to 75 µA at 1 V. These parameters affect circuit performance in high-impedance applications and should be evaluated against specific circuit requirements.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ 1V (µA)	Vf @ 200mA (V)	Temp Range (°C)	Package	Status	RoHS
BZX55F2V7-TAP	Vishay	2.7	±1%	500	85	10	1.5	—/175	DO-35	Obsolete	ROHS3
BZX55B2V7-TAP	Vishay	2.7	±2%	500	85	10	1.5	-65/175	DO-35	Active	ROHS3
1N4371A	Microchip	2.7	±5%	500	30	75	1.1	-65/175	DO-35	Active	Non-compliant
1N5223B	Taiwan Semiconductor	2.7	±5%	500	30	75	1.1	—/100	DO-35	Active	ROHS3
1N5223B BK TIN/LEAD	Central Semiconductor	2.7	±5%	500	30	75	1.1	-65/200	DO-35	Active	Non-compliant
1N5986B	Microchip	2.7	±5%	500	100	75	1.1	-65/175	DO-35	Active	Non-compliant
1N5986C	Microchip	2.7	±2%	500	100	75	1.1	-65/175	DO-35	Active	Non-compliant
1N5986D	Microchip	2.7	±1%	500	100	75	1.1	-65/175	DO-35	Active	Non-compliant
JAN1N4371A-1	Microchip	2.7	±5%	—	30	60	1.1	-65/175	DO-35	Active	Non-compliant

Engineering Selection Recommendations

Primary Equivalent (Active Status, Tightest Tolerance Match): BZX55B2V7-TAP is the direct successor to BZX55F2V7-TAP. Both are manufactured by Vishay and share identical electrical characteristics except for tolerance (±2% vs. ±1%) and expanded operating temperature range (-65°C to 175°C vs. 175°C maximum). This part maintains ROHS3 compliance and AEC-Q101 automotive qualification. The ±2% tolerance is acceptable in most applications where ±1% was previously specified, provided circuit design margins accommodate the additional voltage variation.

Secondary Equivalent (Matched Tolerance, Extended Temperature): 1N5986D (Microchip) matches the ±1% tolerance specification of the original part and extends the operating temperature range to -65°C to 175°C. However, this part is RoHS non-compliant and lacks automotive qualification. Impedance is higher at 100 Ohms compared to 85 Ohms in the original. This part is suitable for applications where tolerance precision is critical and RoHS compliance is not required.

Tolerance-Relaxed Alternatives (±2% Tolerance): 1N5986C (Microchip) offers ±2% tolerance with extended temperature range and higher impedance (100 Ohms). RoHS non-compliant status applies.

Tolerance-Relaxed Alternatives (±5% Tolerance): 1N4371A, 1N5223B, 1N5223B BK TIN/LEAD, 1N5986B, and JAN1N4371A-1 all specify ±5% tolerance. These parts are suitable only where circuit design accommodates ±5% voltage variation. 1N5223B maintains ROHS3 compliance. JAN1N4371A-1 carries military-grade qualification (MIL-PRF-19500/127) and is appropriate for defense and aerospace applications.

Compliance Considerations: For applications requiring ROHS3 compliance, select BZX55B2V7-TAP or 1N5223B. For automotive applications requiring AEC-Q101 qualification, BZX55B2V7-TAP is the only active substitute listed. For military applications, JAN1N4371A-1 is qualified to MIL-PRF-19500/127.

Frequently Asked Questions (FAQ)

Q: Can BZX55B2V7-TAP directly replace BZX55F2V7-TAP? A: Yes. Both parts are manufactured by Vishay, share identical electrical specifications (2.7 V, 500 mW, DO-35 package), and maintain AEC-Q101 automotive qualification. The tolerance difference (±2% vs. ±1%) and expanded temperature range (-65°C to 175°C vs. 175°C maximum) are the only variations. BZX55B2V7-TAP is the active production equivalent.

Q: What is the difference between ±1%, ±2%, and ±5% tolerance specifications? A: Tolerance defines the acceptable deviation of the Zener voltage from the nominal 2.7 V specification. ±1% tolerance allows deviation of ±0.027 V (2.673 V to 2.727 V). ±2% tolerance allows ±0.054 V (2.646 V to 2.754 V). ±5% tolerance allows ±0.135 V (2.565 V to 2.835 V). Circuit designs must accommodate the specified tolerance range. Tighter tolerances are required in precision voltage reference applications.

Q: Why do some substitutes have higher impedance values (100 Ohms vs. 85 Ohms)? A: Impedance (Zzt) is the dynamic impedance of the Zener diode and affects voltage regulation performance under varying load conditions. Higher impedance results in greater voltage variation with load current changes. The 1N5986 series (100 Ohms) exhibits higher impedance than the BZX55 series (85 Ohms). Circuit designs sensitive to load regulation should account for this difference.

Q: What does RoHS compliance mean for this component? A: RoHS (Restriction of Hazardous Substances) compliance indicates the component does not contain restricted materials such as lead, mercury, cadmium, or hexavalent chromium. ROHS3 compliant parts meet current EU regulations. Non-compliant parts may contain lead and are restricted in certain markets and applications. Verify RoHS requirements for your specific application and region.

Q: Is AEC-Q101 qualification important for my application? A: AEC-Q101 is an automotive industry qualification standard. Components meeting this standard are tested and validated for automotive environments, including temperature cycling, vibration, and reliability requirements. If your application is automotive or requires automotive-grade reliability, select AEC-Q101 qualified parts. BZX55B2V7-TAP is the only active substitute with this qualification.

Q: Can I use a military-grade part (JAN1N4371A-1) in a commercial application? A: Yes. Military-grade parts exceed commercial specifications and are fully compatible with commercial applications. JAN1N4371A-1 is qualified to MIL-PRF-19500/127 and carries ±5% tolerance. However, military-grade parts typically have higher cost and longer lead times. Use military-grade parts only when military qualification is specifically required.

Q: What is the significance of reverse leakage current (Ir)? A: Reverse leakage current is the small current that flows through the Zener diode when reverse-biased below the Zener voltage. The BZX55F2V7-TAP specifies 10 µA at 1 V, while most substitutes specify 75 µA. Higher leakage current increases power dissipation and affects circuit performance in high-impedance applications. For applications sensitive to leakage, the original part or BZX55B2V7-TAP are preferred.

Q: Does forward voltage (Vf) affect my circuit design? A: Forward voltage is the voltage drop across the diode when conducting in the forward direction. The BZX55F2V7-TAP specifies 1.5 V at 200 mA, while most substitutes specify 1.1 V at 200 mA. This difference affects power dissipation and circuit behavior when the diode conducts forward current. Verify that your circuit design accommodates the forward voltage specification of the selected substitute.

Q: What is the difference between DO-35 and DO-204AH package designations? A: DO-35 and DO-204AH refer to the same physical package: a two-lead axial through-hole component with a cylindrical body. DO-35 is the common industry designation, while DO-204AH is the formal JEDEC designation. Both terms are interchangeable and describe identical physical and electrical interfaces.

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