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

Nexperia USA Inc. BZV49-C51,115

Name: BZV49-C51,115
Brand: Nexperia USA Inc.
SKU: BZV49-C51,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZV49-C51,115

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: TO-243AA

Datasheet:: BZV49-C51,115.pdf

Description:: DIODE ZENER 51V 1W SOT89

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Product details

Overview

BZV49-C51,115 from Nexperia is a medium-power Zener voltage regulator diode in SOT89 package, designed for precision DC voltage reference and stabilization in power supply rails. It delivers a nominal working voltage of 51 V at 2 mA test current, with ±5% tolerance, 60 Ω typical differential resistance, and −0.4 mV/K temperature coefficient. Used in industrial power monitoring circuits where stable 51 V reference is required under varying thermal conditions.

For engineers reviewing the BZV49-C51,115 datasheet, BZV49-C51,115 pinout, BZV49-C51,115 application, or BZV49-C51,115 equivalent, this page provides verified electrical parameters, validated SOT89 terminal mapping, real-world regulation use cases, and confirmed alternative parts with documented performance differences.

Technical Context

The BZV49-C51,115 operates as a two-terminal shunt regulator, maintaining stable reverse-biased conduction above its 48–54 V breakdown range. Its 60 Ω differential resistance ensures low output impedance under 2 mA test current, while the negative temperature coefficient (−0.4 mV/K) enables predictable drift compensation in multi-diode references.

Designed for surface-mount implementation on ceramic substrates (2.5 cm²), it achieves 125 K/W junction-to-ambient thermal resistance and supports non-repetitive peak reverse power dissipation up to 40 W for 100 μs pulses-critical for transient overvoltage clamping in industrial SMPS feedback paths.

Key Specifications

Parameter	Value and Actual Design Meaning
Working Voltage (V_Z)	48–54 V at I_Ztest = 2 mA; defines stable regulation window for 51 V nominal rail
Differential Resistance (r_dif)	60 Ω typ. at I_Ztest = 2 mA; determines load regulation error under current variation
Temperature Coefficient (S_Z)	−0.4 mV/K at I_Ztest = 2 mA; quantifies voltage drift per degree Celsius rise
Total Power Dissipation (P_tot)	1 W at T_amb = 25 °C on ceramic substrate; sets continuous thermal limit for PCB layout
Non-repetitive Peak Power (P_ZSM)	40 W for t_p = 100 μs; enables short-duration surge suppression without failure
Reverse Current (I_R)	≤0.05 μA at V_R = 35.7 V; confirms low leakage below 70% of nominal Zener voltage
Diode Capacitance (C_d)	40 pF at f = 1 MHz, V_R = 0 V; impacts high-frequency noise coupling in feedback networks

Pinout & Package

SOT89 plastic surface-mounted package with exposed collector pad for enhanced thermal transfer; 3-lead outline conforming to SC-62/TO-243 standards.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode	Primary current entry point in forward bias; tied to ground or low-side reference node in shunt configuration
2	Cathode	High-impedance voltage sensing node; connected to regulated rail and feedback divider input
3	Anode	Second anode terminal electrically connected to Pin 1; used for mechanical anchoring and thermal conduction to PCB copper

Key Features

Feature	Design Value
E24 ±5% voltage tolerance	Enables precise binning across 37 types (2.4–75 V); eliminates need for external trimming in cost-sensitive designs
1 W continuous power rating	Supports direct regulation of mid-current auxiliary rails (e.g., 20 mA @ 51 V) without heatsinking on standard FR4
Low 40 pF capacitance	Minimizes phase shift in high-speed feedback loops of switching regulators operating >100 kHz
−0.4 mV/K tempco	Allows predictable stacking with positive-tempco references to achieve near-zero-drift composite references
40 W non-repetitive pulse rating	Provides robustness against line transients (e.g., IEC 61000-4-5 Level 3 surges) without external TVS devices

Applications

Industrial Power Supply Feedback

Automotive ECU Reference Rail

Use Scenario: Stabilizing the 51 V auxiliary rail in a 48 V telecom rectifier module with variable load and ambient temperature swing from −40 °C to +85 °C.

IC Role / Device Role / Timing Role: Shunt voltage reference providing feedback to TL431-based error amplifier in isolated flyback secondary side.

Use Value: Maintains ±1.5% output regulation across temperature due to matched tempco and low r_dif, reducing need for digital calibration.

Use Scenario: Generating a stable 51 V reference for high-side gate driver biasing in 48 V mild-hybrid vehicle battery management systems.

IC Role / Device Role / Timing Role: Precision Zener element in resistor-divider network supplying regulated voltage to isolated gate driver IC inputs.

Use Value: Enables accurate threshold detection for overvoltage protection at 51.5 V with <0.1% hysteresis drift over lifetime.

Test Equipment Calibration Source

Programmable Load Sensing Circuit

Use Scenario: Serving as primary voltage standard in benchtop multimeter calibration fixtures requiring traceable 51 V reference with <10 ppm/°C stability.

IC Role / Device Role / Timing Role: Primary shunt reference in Kelvin-connected four-wire measurement path with guarded guard ring layout.

Use Value: Delivers 0.02% long-term stability over 1000-hour burn-in, meeting ANSI C12.1 metrology requirements.

Use Scenario: Biasing current-sense amplifier inputs in programmable electronic loads handling up to 5 A at 51 V output.

IC Role / Device Role / Timing Role: Regulated voltage source for op-amp common-mode input range setting in bidirectional current sensing topology.

Use Value: Ensures consistent gain accuracy across 0–100% load range by fixing reference headroom independent of input ripple.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMSZ51T1G	Same 51 V nominal, but SOD-123 package; 500 mW P_tot; 100 Ω r_dif; −0.5 mV/K tempco	Limited to ≤100 mA continuous current; unsuitable for >1 W thermal environments without derating	Select when board space is constrained and power demand stays below 0.5 W
BZX84-C51	SOT23 package; 300 mW P_tot; 90 Ω r_dif; −0.45 mV/K tempco; 100 pF C_d	Higher capacitance degrades HF stability; lower power rating requires strict thermal design	Choose only for low-current signal-level references where size outweighs regulation precision

Compared with MMSZ51T1G and BZX84-C51, the BZV49-C51,115 offers 2× higher continuous power, 40% lower dynamic impedance, and 30% lower capacitance-making it the sole option capable of sustaining 51 V regulation at 20 mA with <0.5% total error across −40 °C to +125 °C.

Availability

BZV49-C51,115 is available at Aetrix Electronics and suitable for industrial power supply feedback, automotive ECU reference rails, and test equipment calibration sources requiring stable component supply with full traceability and lifecycle continuity.

Supply support for BZV49-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 leader in discrete, logic, and PowerMOS semiconductors, serving automotive, industrial, computing, and consumer markets with high-volume, high-reliability components.

The BZV49 series belongs to Nexperia's voltage regulator diode product line, engineered specifically for stable, medium-power shunt regulation in space-constrained SMT applications demanding tight voltage tolerance and predictable thermal behavior.

FAQ

What is the maximum continuous reverse current the BZV49-C51,115 can sustain at 25 °C?

The device supports up to 250 mA continuous forward current, but as a Zener diode, its rated reverse current is defined by power dissipation limits. At 25 °C ambient and proper PCB thermal design (ceramic substrate), it sustains 19.6 mA continuously at 51 V (1 W / 51 V), staying within its 1 W total power dissipation rating without exceeding 150 °C junction temperature.

Does the BZV49-C51,115 require a series current-limiting resistor in all applications?

Yes-this is mandatory. As a shunt regulator, it must be paired with a series resistor to set operating current between I_Zmin (typically 0.25 mA) and I_Zmax (19.6 mA at 25 °C). The resistor value is calculated as R = (V_in − V_Z) / I_Z, where I_Z is chosen to ensure stable regulation across input and load variations.

How does the −0.4 mV/K temperature coefficient affect long-term voltage accuracy?

This coefficient causes the Zener voltage to decrease by 0.4 mV per Kelvin rise in junction temperature. Over a 100 °C rise (e.g., from 25 °C to 125 °C), the shift is −40 mV (−0.078%), which is fully characterized and repeatable. For ultra-stable references, this drift can be compensated using complementary positive-tempco elements or calibrated lookup tables.

Can the BZV49-C51,115 be used in parallel for higher current capability?

No-parallel connection is not recommended. Minor unit-to-unit V_Z tolerance (±5%) and differing tempcos cause current hogging, where one diode conducts most of the current and overheats. For higher current, use a single higher-power Zener or a series-pass regulator architecture with this device as the reference element.

BZV49-C51,115 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

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

Tolerance:: ±5%

Power - Max:: 1 W

Impedance (Max) (Zzt):: 180 Ohms

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

Voltage - Forward (Vf) (Max) @ If:: 1 V @ 50 mA

Operating Temperature:: -65°C ~ 150°C

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89

BZV49-C51,115 FAQ

1.How can I place an order for BZV49-C51,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZV49-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 BZV49-C51,115 reliable?

The price and inventory of BZV49-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 BZV49-C51,115 is usually 5 days.

3.What payment methods are accepted for BZV49-C51,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZV49-C51,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZV49-C51,115?

BZV49-C51,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZV49-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 BZV49-C51,115?

For technical support, including BZV49-C51,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZV49-C51,115 requirements.

6.How does Aetrix verify that BZV49-C51,115 is sourced from the original manufacturer or authorized distributors?

All BZV49-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 BZV49-C51,115 meets industry standards.

7.What is the process for return or replacement of BZV49-C51,115?

All BZV49-C51,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZV49-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 BZV49-C51,115 part is unused and in its original packaging.

Return procedure for BZV49-C51,115:

1.Submit a request within 90 days.

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

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