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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Nexperia USA Inc. BZV55-C51,115

Name: BZV55-C51,115
Brand: Nexperia USA Inc.
SKU: BZV55-C51,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZV55-C51,115

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: DO-213AC, MINI-MELF, SOD-80

Datasheet:: BZV55-C51,115.pdf

Description:: DIODE ZENER 51V 500MW LLDS

Quantity:: RFQ Add To RFQ list

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Inventory:2,349

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Product details

Overview

BZV55-C51,115 from Nexperia is a 51 V ±5 % tolerance Zener voltage regulator diode in a hermetically sealed SOD80C glass SMD package, rated for 500 mW total power dissipation and 40 W non-repetitive peak reverse power, used for precision low-power voltage reference and regulation in analog sensor signal conditioning circuits.

For engineers reviewing the BZV55-C51,115 datasheet, BZV55-C51,115 pinout, BZV55-C51,115 application, or BZV55-C51,115 equivalent, this part serves as a stable shunt reference in low-current bias networks, power supply feedback paths, and overvoltage clamp stages where tight thermal coefficient control (±0.4 mV/K typical at I_Z = 2 mA) and low differential resistance (90 Ω max at I_Z = 2 mA) are required.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable 51 V reference across its terminals under controlled current conditions. Its temperature coefficient of +0.4 mV/K (typical at I_Z = 2 mA) ensures predictable drift behavior in ambient-temperature-varying environments, and its 90 Ω maximum differential resistance enables minimal output voltage variation with load current changes.

The device uses a planar epitaxial construction with hermetic glass encapsulation, delivering high reliability in humid or thermally cycling environments. It supports surge handling up to 40 W for 100 µs pulses and maintains reverse leakage below 50 nA at 35.7 V (0.7 × V_Z(nom)) - critical for low-power standby regulation.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	51 V ±5 % - defines regulated output voltage under 2 mA test current; actual range 48.0–54.0 V.
Total Power Dissipation	500 mW - maximum continuous DC power at T_amb ≤ 50 °C on ceramic substrate; limits usable current to ~9.8 mA at 51 V.
Differential Resistance	90 Ω max at I_Z = 2 mA - determines output impedance; enables <100 mV deviation per 1 mA load change.
Temperature Coefficient	+0.4 mV/K typical at I_Z = 2 mA - quantifies voltage drift vs. junction temperature; enables ±2.55 mV shift over 0–65 °C ambient.
Reverse Leakage Current	50 nA max at V_R = 35.7 V - ensures negligible quiescent current draw in high-impedance reference nodes.
Forward Voltage	0.9 V max at I_F = 10 mA - defines anode-cathode drop during forward conduction; relevant for polarity protection or dual-use clamping.
Package	SOD80C - 3.3–3.7 mm length, 1.45–1.60 mm width, 0.3 mm height glass SMD; compatible with standard reflow profiles.

Pinout & Package

SOD80C is a two-terminal surface-mount glass package with axial lead configuration: cathode marked by a band, anode unmarked. The compact 3.5 mm × 1.5 mm footprint supports high-density PCB layouts and automated placement.

Pin/Terminal	Circuit Role	Design Meaning
1 (banded end)	Cathode	Connected to regulated voltage node; reverse-biased during Zener operation; carries full Zener current.
2 (unmarked end)	Anode	Connected to circuit ground or lower-potential rail; completes current path during regulation/clamp operation.

Key Features

Feature	Design Value
Hermetic glass sealing	Prevents moisture ingress and long-term parameter drift; supports >10-year stability in industrial environments.
Low differential resistance	90 Ω max ensures <100 mV output variation across ±1 mA Zener current change - critical for precision references.
Controlled temperature coefficient	+0.4 mV/K typical minimizes thermal-induced error in battery-powered or unheated sensor front-ends.
Non-repetitive surge rating	40 W for 100 µs enables transient overvoltage clamping without degradation - suitable for ESD-protected I/O lines.

Applications

Industrial Sensor Signal Conditioning

Low-Power Microcontroller Reference

Use Scenario: Stabilizing excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs) in programmable logic controllers.

IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 51 V bias to bridge top rail, enabling ratiometric ADC measurement.

Use Value: Maintains ±0.1 % regulation over 0–70 °C due to low rdif and predictable TC, improving measurement repeatability.

Use Scenario: Supplying precise reference voltage to internal ADC or comparator in ultra-low-power MCU sleep modes.

IC Role / Device Role / Timing Role: Low-quiescent-current Zener source (<50 nA leakage) generating stable 51 V rail for external voltage divider feeding 3.3 V LDO input.

Use Value: Enables accurate 12-bit ADC conversion without external reference IC, reducing BOM count and standby power.

Overvoltage Clamp for RS-485 Transceivers

Feedback Voltage Divider in Isolated Flyback Supplies

Use Scenario: Protecting RS-485 receiver inputs against transients exceeding ±30 V common-mode range.

IC Role / Device Role / Timing Role: Bidirectional clamping element (with series resistor) limiting line voltage to ±51 V relative to ground.

Use Value: Absorbs 40 W surges for 100 µs without failure, meeting IEC 61000-4-5 Level 3 immunity requirements.

Use Scenario: Setting output voltage in secondary-side regulated flyback converters using optocoupler feedback.

IC Role / Device Role / Timing Role: Upper leg of voltage divider connected to TL431 cathode; provides stable 51 V reference point for error amplifier.

Use Value: Reduces output voltage drift to <±0.5 % over line/load/temperature due to low rdif and tight tolerance.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener voltage regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX55-C51	Same 51 V ±5 % rating, but in larger DO-35 glass package (not SMD); 500 mW rating, higher R_th(j-a) (500 K/W).	Requires through-hole assembly; unsuitable for high-density or automated SMT lines.	Select when legacy through-hole design or manual prototyping is preferred.
MMSZ5257B	51 V ±5 %, SOD-123 package; 500 mW rating but higher typical rdif (130 Ω) and less stable TC (±2 mV/K).	Lower regulation accuracy under varying load/temperature; reduced surge margin (25 W).	Select only for cost-sensitive, non-critical regulation where ±1 % output stability suffices.

Compared with BZX55-C51 and MMSZ5257B, BZV55-C51,115 delivers superior thermal stability and SMT compatibility in a compact hermetic package - making it optimal for space-constrained, high-reliability industrial sensing and power feedback designs.

Availability

BZV55-C51,115 is available at Aetrix Electronics and suitable for industrial sensor interfaces, isolated power supply feedback networks, and RS-485 transient protection circuits requiring stable component supply and guaranteed traceable sourcing.

Supply support for BZV55-C51,115 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified and industrial-grade components.

The BZV55 series belongs to Nexperia's precision Zener regulator portfolio, engineered specifically for stable low-power voltage reference and clamping in harsh-environment industrial and communication equipment.

FAQ

What is the maximum continuous Zener current for BZV55-C51,115 at 25 °C?

At 25 °C ambient and mounted on a 10 × 10 × 0.6 mm ceramic substrate, the maximum continuous Zener current is 9.8 mA - calculated from P_tot = 500 mW ÷ V_Z = 500 mW ÷ 51 V. Derating applies above 50 °C ambient per the thermal resistance curve.

Can BZV55-C51,115 be used in place of a 5.1 V Zener diode?

No - BZV55-C51,115 is a 51 V device, not 5.1 V. Confusion may arise from the "51" suffix, but per Nexperia's ordering code, BZV55-C51 denotes nominal 51 V regulation. For 5.1 V, use BZV55-C5V1,115 instead.

Is this diode suitable for automotive applications?

No - BZV55-C51,115 is not automotive-qualified. The datasheet explicitly states "Non-automotive qualified products" and confirms no AEC-Q200 testing or qualification. It is intended for industrial, communications, and consumer equipment only.

How does the SOD80C package affect thermal performance compared to DO-35?

SOD80C offers lower thermal resistance to solder point (R_th(j-sp) = 300 K/W) than DO-35 (≈450 K/W), enabling better heat transfer to PCB copper. However, its smaller mass reduces surge energy absorption - so while steady-state regulation improves, single-pulse robustness relies more on layout and external series resistance.

BZV55-C51,115 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: DO-213AC, MINI-MELF, SOD-80

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 51 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 180 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 35.7 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -65°C ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: LLDS; MiniMelf

BZV55-C51,115 FAQ

1.How can I place an order for BZV55-C51,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZV55-C51,115 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BZV55-C51,115 reliable?

The price and inventory of BZV55-C51,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZV55-C51,115 is usually 5 days.

3.What payment methods are accepted for BZV55-C51,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZV55-C51,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZV55-C51,115?

BZV55-C51,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZV55-C51,115 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BZV55-C51,115?

For technical support, including BZV55-C51,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZV55-C51,115 requirements.

6.How does Aetrix verify that BZV55-C51,115 is sourced from the original manufacturer or authorized distributors?

All BZV55-C51,115 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BZV55-C51,115 meets industry standards.

7.What is the process for return or replacement of BZV55-C51,115?

All BZV55-C51,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZV55-C51,115, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BZV55-C51,115 part is unused and in its original packaging.

Return procedure for BZV55-C51,115:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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