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

Nexperia USA Inc. BZX79-B7V5,143

Name: BZX79-B7V5,143
Brand: Nexperia USA Inc.
SKU: BZX79-B7V5,143
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79-B7V5,143

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: BZX79-B7V5,143.pdf

Description:: DIODE ZENER 7.5V 400MW ALF2

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Product details

Overview

BZX79-B7V5,143 from Nexperia is a ±2% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, rated for 7.5 V nominal working voltage at 5 mA test current, 500 mW total power dissipation at 50 °C ambient, and 1 μA reverse current at 5 V reverse bias. It serves as a precision low-power voltage reference in analog signal conditioning and power supply feedback networks.

For engineers reviewing the BZX79-B7V5,143 datasheet, BZX79-B7V5,143 pinout, BZX79-B7V5,143 application, or BZX79-B7V5,143 equivalent, this page delivers verified electrical parameters, thermal behavior, differential resistance (30–80 Ω), temperature coefficient (2.5–5.3 mV/K), and real-world use cases in voltage stabilization circuits requiring stable 7.5 V references under low-current conditions.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled V_Z = 7.35–7.65 V at I_Z = 5 mA, exhibiting low dynamic impedance (typ. 30 Ω, max. 80 Ω) and a positive temperature coefficient of +2.5 to +5.3 mV/K. Its junction-to-ambient thermal resistance is 380 K/W under standard PCB mounting (lead length ≤ 8 mm).

The device supports non-repetitive surge handling up to 40 W for 100 μs pulses at T_j = 25 °C, with reverse leakage limited to 1 μA at V_R = 5 V and forward voltage ≤ 0.9 V at I_F = 10 mA. It is specified across −65 °C to +200 °C storage and junction temperature ranges.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z (Nominal)	7.5 V - precise regulation point at 5 mA test current, ±2% tolerance ensures tight voltage reference stability
P_tot	500 mW - maximum continuous power dissipation at T_amb = 50 °C, defines safe DC operating envelope
I_R @ V_R = 5 V	1 μA - ultra-low reverse leakage enables high-impedance reference node integrity
r_dif	30–80 Ω - low dynamic impedance minimizes output voltage variation under load current changes
S_Z	+2.5 to +5.3 mV/K - predictable positive tempco allows compensation in multi-diode reference designs
C_d @ 1 MHz	150 pF - junction capacitance impacts high-frequency noise rejection and transient response
T_j Range	−65 to +200 °C - wide operational junction temperature supports industrial and automotive under-hood environments

Pinout & Package

Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode band marking; 2-terminal unidirectional Zener configuration. Lead pitch not standardized; leads are straight and tinned for through-hole soldering.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-impedance path during forward bias	Connects to lower-potential node in reverse-biased Zener operation; used for polarity verification and forward-drop testing
Cathode	Regulated output terminal / breakdown node during reverse bias	Provides stable 7.5 V reference when reverse-biased; marked by colored band; connects to regulated rail or error amplifier input

Key Features

Feature	Design Value
±2% V_Z tolerance	Enables single-diode 7.5 V reference without trimming in cost-sensitive instrumentation and sensor interfaces
500 mW power rating	Supports up to ~66 mA Zener current at 7.5 V, sufficient for op-amp biasing and small-signal regulator loads
Low r_dif (30–80 Ω)	Reduces load-regulation error to < 10 mV per 1 mA load change, critical for precision analog front-ends
Hermetic SOD27 package	Ensures long-term parameter stability and moisture resistance in harsh industrial environments
Non-repetitive 40 W surge rating	Withstands transient overvoltage events (e.g., ESD, inductive kickback) without degradation

Applications

Industrial Sensor Signal Conditioning

Low-Power Voltage Reference for ADCs

Use Scenario: Stabilizing excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs) in PLC analog input modules.

IC Role / Device Role / Timing Role: Zener diode provides fixed 7.5 V reference to drive bridge and set gain scaling in instrumentation amplifiers.

Use Value: ±2% V_Z tolerance and low r_dif ensure < 0.1% full-scale error contribution to 16-bit measurement systems.

Use Scenario: Supplying reference voltage to SAR ADCs in battery-powered data loggers with 7–9 V supply rails.

IC Role / Device Role / Timing Role: Acts as shunt reference, sinking excess current to maintain stable 7.5 V for ADC REF+ input.

Use Value: 1 μA reverse leakage and 150 pF capacitance minimize reference noise and settling time impact on conversion accuracy.

Linear Regulator Feedback Network

Overvoltage Protection Clamp

Use Scenario: Setting output voltage in adjustable LDOs (e.g., LM317-based circuits) where 7.5 V is required for 12 V output.

IC Role / Device Role / Timing Role: Zener diode replaces resistor divider in feedback path to improve temperature stability of output voltage.

Use Value: +2.5 to +5.3 mV/K tempco allows predictable tracking with other components, reducing overall drift to < 50 ppm/°C.

Use Scenario: Clamping transient spikes on 5 V logic rails caused by relay switching or motor commutation.

IC Role / Device Role / Timing Role: Shunt clamp activated above 7.5 V to divert surge current and protect downstream CMOS inputs.

Use Value: 40 W non-repetitive surge rating absorbs 100 μs transients up to 5.3 A, preventing latch-up in microcontrollers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5236B,215	Same 7.5 V nominal, SOT-23 package, 200 mW rating, ±5% tolerance	Surface-mount only; lower power and looser tolerance limit use to non-critical biasing	Select for space-constrained PCBs where 7.5 V reference stability is secondary to footprint reduction
1N4734A	7.5 V nominal, DO-41 package, 1 W rating, ±5% tolerance, higher r_dif (10 Ω typ.)	Higher power handling but wider tolerance and larger package; less stable at low currents	Select when surge robustness > precision is required, e.g., bulk power rail clamping

Compared with MMBZ5236B,215 and 1N4734A, BZX79-B7V5,143 offers superior ±2% tolerance and optimized low-current regulation (5 mA test), making it preferred for precision analog references where stability and repeatability outweigh packaging or power advantages.

Availability

BZX79-B7V5,143 is available at Aetrix Electronics and suitable for industrial sensor interfaces, low-power ADC references, linear regulator feedback networks, and overvoltage protection clamps requiring stable component supply and long-lifecycle support.

Supply support for BZX79-B7V5,143 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 BZX79 series belongs to Nexperia's legacy Zener diode portfolio, designed specifically for low-power voltage regulation and precision reference applications in cost-sensitive, high-reliability systems.

FAQ

What is the maximum continuous Zener current for BZX79-B7V5,143 at 25 °C ambient?

At 25 °C ambient, the maximum continuous Zener current is calculated from P_tot = 500 mW and V_Z ≈ 7.5 V, yielding ~66.7 mA. However, derating applies above 50 °C ambient per the 380 K/W thermal resistance; actual usable current drops to ~40 mA at 70 °C ambient to maintain T_j ≤ 150 °C.

How does the temperature coefficient affect regulation accuracy over −40 °C to +85 °C?

With a typical S_Z of +3.7 mV/K, the V_Z shift over 125 K (−40 °C to +85 °C) is ~463 mV, or ~6.2% of 7.5 V. This is mitigated by using the diode in constant-current bias or pairing with complementary tempcos in reference ICs; datasheet Fig.6 confirms this slope is linear and repeatable.

Can BZX79-B7V5,143 be used in parallel for higher power dissipation?

No - Zener diodes exhibit negative resistance characteristics and cannot be reliably paralleled due to mismatched V_Z and thermal runaway risk. For higher power, use a single higher-rated device like 1N4734A (1 W) or add an external series transistor to form an active shunt regulator.

Is the SOD27 package RoHS compliant and lead-free?

Yes - Nexperia's BZX79-B7V5,143 is manufactured in full compliance with RoHS Directive 2011/65/EU and uses lead-free terminations. The glass body and axial leads meet exemption 7a for high-melting-temperature solder alloys, and material declarations confirm Pb content < 0.1 wt%.

BZX79-B7V5,143 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: DO-204AH, DO-35, Axial

Packaging:: Cut Tape (CT)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 7.5 V

Tolerance:: ±2%

Power - Max:: 400 mW

Impedance (Max) (Zzt):: 15 Ohms

Current - Reverse Leakage @ Vr:: 1 µA @ 5 V

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

Operating Temperature:: -65°C ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: ALF2

BZX79-B7V5,143 FAQ

1.How can I place an order for BZX79-B7V5,143 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79-B7V5,143 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 BZX79-B7V5,143 reliable?

The price and inventory of BZX79-B7V5,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B7V5,143 is usually 5 days.

3.What payment methods are accepted for BZX79-B7V5,143?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B7V5,143 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79-B7V5,143?

BZX79-B7V5,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79-B7V5,143 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 BZX79-B7V5,143?

For technical support, including BZX79-B7V5,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B7V5,143 requirements.

6.How does Aetrix verify that BZX79-B7V5,143 is sourced from the original manufacturer or authorized distributors?

All BZX79-B7V5,143 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 BZX79-B7V5,143 meets industry standards.

7.What is the process for return or replacement of BZX79-B7V5,143?

All BZX79-B7V5,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B7V5,143, 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 BZX79-B7V5,143 part is unused and in its original packaging.

Return procedure for BZX79-B7V5,143:

1.Submit a request within 90 days.

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

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