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

Nexperia USA Inc. BZX79-B9V1,133

Name: BZX79-B9V1,133
Brand: Nexperia USA Inc.
SKU: BZX79-B9V1,133
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79-B9V1,133

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX79-B9V1,133.pdf

Description:: DIODE ZENER 9.1V 400MW ALF2

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BZX79-B9V1,133 from Nexperia is a ±2% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, designed for low-power voltage reference and stabilization at 9.1 V nominal with 500 mW total power dissipation and 3.8–7.0 mV/K temperature coefficient. It operates with 500 nA reverse current at 6 V reverse bias and supports precision analog circuits requiring stable DC references.

For engineers reviewing the BZX79-B9V1,133 datasheet, BZX79-B9V1,133 pinout, BZX79-B9V1,133 application, or BZX79-B9V1,133 equivalent, this page delivers verified electrical parameters, thermal resistance data, differential resistance (40–100 Ω), junction-to-ambient thermal resistance (380 K/W), and real-world use context for embedded voltage reference design.

Technical Context

This Zener diode functions as a two-terminal shunt voltage regulator, maintaining a stable 9.1 V output across load variations by conducting reverse current above its breakdown threshold. Its operation relies on controlled avalanche breakdown in silicon, with specified test current of 5 mA and differential resistance of 40–100 Ω at that point.

The device exhibits a positive temperature coefficient of +3.8 to +7.0 mV/K at I_Z = 5 mA, enabling predictable drift compensation in temperature-sensitive references. Its 150 pF diode capacitance at 0 V and 1 MHz supports stable performance in low-frequency regulation, not RF applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	9.1 V at 5 mA test current - defines precise DC reference level for feedback loops or analog comparators
Tolerance	±2% - ensures tight voltage accuracy without post-production trimming in production-grade references
Differential Resistance	40–100 Ω - determines load regulation error: ΔV_Z ≈ I_Z × r_dif under dynamic current changes
Reverse Current	500 nA at V_R = 6 V - confirms low leakage for battery-powered or high-impedance bias networks
Total Power Dissipation	500 mW at T_amb = 50 °C - sets maximum continuous power handling on standard PCB without heatsinking
Temperature Coefficient	+3.8 to +7.0 mV/K - quantifies voltage drift per degree Celsius, critical for thermal stability in industrial environments
Junction-to-Ambient R_th	380 K/W - defines thermal rise: ΔT_j = P_diss × 380 K/W, limiting safe operating area at elevated ambient

Pinout & Package

Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode band marking; leads are tinned copper alloy, suitable for wave or hand soldering. Package dimensions: D = 4.25 mm max, L = 25.4 mm min, b = 0.56 mm max.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-side connection	Connected to ground or lower potential node in shunt regulator configuration
Cathode	Zener breakdown terminal / high-side connection	Connected to input supply via series resistor; regulates voltage at cathode node relative to anode

Key Features

Feature	Design Value
±2% voltage tolerance	Enables direct replacement in precision reference designs without recalibration or resistor adjustment
500 mW power rating	Supports robust operation in 5–12 V supply rails with typical 1 kΩ series resistors delivering ~5 mA Zener current
Hermetic glass SOD27 package	Ensures long-term reliability and moisture resistance in industrial and automotive under-hood environments
Low 500 nA leakage at 6 V	Minimizes standby current draw in always-on monitoring circuits and battery-backed systems
380 K/W thermal resistance	Allows thermal modeling on standard FR-4 PCBs without copper pour, simplifying layout for space-constrained designs

Applications

Industrial Sensor Signal Conditioning

Microcontroller Voltage Reference

Use Scenario: Providing stable 9.1 V reference for 12-bit ADC front-end amplifiers in pressure transducers.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise scaling for analog input channels.

Use Value: ±2% tolerance and low tempco ensure <0.5% full-scale error over −40 °C to +85 °C operating range.

Use Scenario: Biasing internal bandgap reference or powering external DAC in STM32-based PLC modules.

IC Role / Device Role / Timing Role: Low-noise DC reference source for analog subsystems requiring stable excitation voltage.

Use Value: 500 nA leakage prevents loading of high-impedance reference nodes, preserving ADC linearity.

Power Supply Overvoltage Clamp

LED Driver Current Set Point

Use Scenario: Protecting 9 V rail in legacy telecom interface cards from transient surges up to 40 W peak.

IC Role / Device Role / Timing Role: Non-repetitive surge clamp activated during overvoltage events.

Use Value: 40 W non-repetitive peak power rating enables single-device protection without external TVS stacking.

Use Scenario: Setting constant current for indicator LEDs in HVAC control panels using simple resistor-Zener bias.

IC Role / Device Role / Timing Role: Voltage reference defining emitter-base drop in transistor-based current mirror.

Use Value: 40–100 Ω differential resistance ensures <1% current variation across 10–100 mA LED loads.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5240B,115	Same 9.1 V, ±5% tolerance, SOT-23 package, 200 mW rating	Surface-mount only; unsuitable for through-hole boards or high-temp reflow profiles exceeding 260 °C	Select when board space is constrained and thermal load is ≤200 mW
BZX84-C9V1,115	9.1 V, ±5% tolerance, SOT-23, 300 mW, higher leakage (1 μA @ 6 V)	Larger voltage tolerance increases reference uncertainty; higher leakage affects ultra-low-power designs	Choose for cost-sensitive consumer applications where ±5% accuracy is acceptable

Compared with BZX79-B9V1,133, MMBZ5240B offers SMT compatibility but sacrifices 40% power handling and ±2% precision; BZX84-C9V1 trades accuracy and leakage performance for lower unit cost in non-critical references.

Availability

BZX79-B9V1,133 is available at Aetrix Electronics and suitable for industrial sensor conditioning, microcontroller reference circuits, overvoltage clamping, and LED current setting requiring stable component supply and long-lifecycle support.

Supply support for BZX79-B9V1,133 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 semiconductors, spun off from NXP in 2017, specializing in high-volume, high-reliability components for automotive, industrial, and computing markets.

The BZX79 series belongs to Nexperia's legacy Zener diode portfolio, engineered for cost-effective, stable voltage regulation in general-purpose analog and power management circuits.

FAQ

What is the maximum continuous reverse current this diode can handle at 9.1 V?

The BZX79-B9V1,133 is rated for continuous Zener current up to 55 mA at 9.1 V, derived from its 500 mW power limit (P = V × I → I = 500 mW / 9.1 V ≈ 55 mA). Operation beyond this risks thermal runaway due to its 380 K/W junction-to-ambient resistance.

Can this diode be used in series or parallel configurations for higher voltage or current?

Series connection is feasible for higher reference voltages but requires matched units to avoid current imbalance; parallel use is strongly discouraged due to negative thermal feedback and unequal current sharing caused by manufacturing tolerances in Zener voltage and tempco.

How does the temperature coefficient affect accuracy in a 0–70 °C ambient range?

With a +3.8 to +7.0 mV/K coefficient, the voltage shift over 70 °C is +0.27 V to +0.49 V - a +3.0% to +5.4% deviation from 9.1 V. For high-accuracy applications, this must be compensated via circuit design or calibration, especially above 50 °C.

Is the SOD27 package RoHS-compliant and lead-free?

Yes, the BZX79-B9V1,133 in SOD27 packaging meets RoHS Directive 2011/65/EU and is lead-free, with termination finish of matte tin over nickel. The glass body and axial leads comply with JEDEC J-STD-020 moisture sensitivity level (MSL) 1 for unlimited floor life.

BZX79-B9V1,133 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):: 9.1 V

Tolerance:: ±2%

Power - Max:: 400 mW

Impedance (Max) (Zzt):: 15 Ohms

Current - Reverse Leakage @ Vr:: 500 nA @ 6 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-B9V1,133 FAQ

1.How can I place an order for BZX79-B9V1,133 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79-B9V1,133 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-B9V1,133 reliable?

The price and inventory of BZX79-B9V1,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B9V1,133 is usually 5 days.

3.What payment methods are accepted for BZX79-B9V1,133?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B9V1,133 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79-B9V1,133?

BZX79-B9V1,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79-B9V1,133 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-B9V1,133?

For technical support, including BZX79-B9V1,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B9V1,133 requirements.

6.How does Aetrix verify that BZX79-B9V1,133 is sourced from the original manufacturer or authorized distributors?

All BZX79-B9V1,133 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-B9V1,133 meets industry standards.

7.What is the process for return or replacement of BZX79-B9V1,133?

All BZX79-B9V1,133 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B9V1,133, 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-B9V1,133 part is unused and in its original packaging.

Return procedure for BZX79-B9V1,133:

1.Submit a request within 90 days.

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

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