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

Nexperia USA Inc. BZX79-B33,133

Name: BZX79-B33,133
Brand: Nexperia USA Inc.
SKU: BZX79-B33,133
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX79-B33,133

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX79-B33,133.pdf

Description:: DIODE ZENER 33V 400MW ALF2

Quantity:: RFQ Add To RFQ list

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Inventory:9,895

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Product details

Overview

BZX79-B33,133 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal working voltage 33 V at I_Ztest = 2 mA, differential resistance ≤75 Ω, temperature coefficient +23.3 mV/K, and maximum non-repetitive peak reverse current 0.9 A (t_p = 100 μs). It operates as a low-power voltage reference in bias networks, overvoltage clamping circuits, and precision analog signal conditioning stages.

For engineers reviewing the BZX79-B33,133 datasheet, BZX79-B33,133 pinout, BZX79-B33,133 application, or BZX79-B33,133 equivalent, this device is selected for stable 33 V regulation under low-current conditions (≤5 mA), where tight voltage tolerance, predictable thermal drift, and hermetic glass-package reliability are required in space-constrained PCB layouts.

Technical Context

This Zener diode functions in reverse-biased breakdown mode, delivering precise DC voltage stabilization via controlled avalanche mechanism. Its 33 V nominal Zener voltage is specified at 2 mA test current, with differential resistance of 75 Ω (typ.) ensuring minimal output variation under load shifts up to ±1 mA.

Temperature coefficient of +23.3 mV/K indicates positive drift - voltage increases ~23.3 mV per Kelvin rise - enabling predictable compensation in thermally coupled reference designs. The SOD27 (DO-35) axial glass package provides hermetic sealing and thermal resistance R_{th j-a} = 380 K/W (lead length ≤8 mm).

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	32.3 V to 33.7 V at I_Z = 2 mA - ensures ±2% regulation accuracy in feedback loops requiring tight reference stability
Differential Resistance r_dif	≤75 Ω (typ.) - limits output voltage shift to ≤75 mV per 1 mA load change, critical for low-noise analog references
Temperature Coefficient S_Z	+23.3 mV/K - enables predictable thermal tracking; used with NTC components for compensated references
Max Power Dissipation P_tot	500 mW at T_amb = 50 °C - supports continuous operation in ambient temperatures up to 50 °C without heatsinking
Reverse Current I_R	≤50 nA at V_R = 0.7 × V_Znom = 23.1 V - guarantees negligible leakage in high-impedance sensing nodes
Diode Capacitance C_d	45 pF at f = 1 MHz, V_R = 0 V - defines high-frequency impedance; impacts noise coupling in RF-adjacent bias rails
Non-repetitive Peak I_ZSM	0.9 A (t_p = 100 μs) - allows transient surge suppression in ESD-protected input stages

Pinout & Package

Hermetically sealed axial-lead SOD27 (DO-35) glass package with cathode band marking. Leads are tinned copper-clad steel; body diameter 1.85 mm, length 4.25 mm, lead spacing 25.4 mm.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-side connection in reverse-bias configuration	Connected to circuit ground or lower-potential node when used as shunt regulator
Cathode	Zener breakdown terminal / high-side connection in reverse-bias configuration	Connected to supply rail or signal node requiring stabilized voltage; marked by band on glass body

Key Features

Feature	Design Value
±2% Zener voltage tolerance	Enables direct use in precision references without post-calibration trimming
Hermetic SOD27 glass package	Ensures long-term parameter stability and moisture resistance in industrial environments
Low differential resistance (75 Ω typ.)	Maintains regulation accuracy across varying load currents in feedback networks
Controlled positive temperature coefficient	Allows predictable thermal compensation when paired with negative-coefficient components
Non-repetitive 40 W peak power rating	Provides robustness against short-duration transients in unprotected input paths

Applications

Power Supply Reference

Overvoltage Clamp

Use Scenario: Providing stable 33 V reference for op-amp biasing and ADC voltage scaling in industrial sensor interfaces.

IC Role / Device Role / Timing Role: Shunt voltage reference connected between supply rail and ground, sinking excess current to maintain fixed node voltage.

Use Value: ±2% initial tolerance and +23.3 mV/K TC allow <±3% total drift over −40 °C to +85 °C without external compensation.

Use Scenario: Protecting microcontroller I/O pins from 36 V surges in 24 V automotive subsystems.

IC Role / Device Role / Timing Role: Reverse-biased clamping element placed between signal line and ground, conducting only above 33 V threshold.

Use Value: 0.9 A non-repetitive surge capability absorbs 100 μs transients without degradation, verified per IEC 61000-4-5.

Current Source Bias

Analog Signal Level Shifting

Use Scenario: Setting bias current for JFET amplifiers in audio preamplifier front-ends.

IC Role / Device Role / Timing Role: Series-connected Zener providing fixed voltage drop to establish gate-source bias point.

Use Value: 75 Ω differential resistance ensures <±0.15 V error across 2–3 mA operating range, preserving gain linearity.

Use Scenario: Translating ±10 V DAC output to 0–33 V range for driving high-voltage op-amps.

IC Role / Device Role / Timing Role: Clamped reference node defining upper rail of level-shifting amplifier stage.

Use Value: 45 pF capacitance minimizes phase lag at audio frequencies (<20 kHz), avoiding signal distortion.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5263B,215	Surface-mount SOT-23 package; 33 V ±5%; r_dif = 90 Ω (typ.); I_ZSM = 0.5 A	Lower surge rating and higher dynamic impedance limit use in high-transient or precision analog roles	Select for automated assembly where board space is constrained and ±5% tolerance is acceptable
1N4747A	DO-41 package; 33 V ±5%; P_tot = 1 W; r_dif = 35 Ω (typ.); S_Z = +23 mV/K	Higher power handling but larger footprint and looser tolerance reduce suitability for compact precision references	Select when >500 mW continuous dissipation is needed and ±5% tolerance suffices

Compared with MMBZ5263B,215 and 1N4747A, BZX79-B33,133 uniquely combines ±2% tolerance, hermetic DO-35 reliability, and optimized 75 Ω impedance for mid-precision analog references where thermal drift predictability and long-term stability outweigh surface-mount convenience or raw power capacity.

Availability

BZX79-B33,133 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive ECU input protection, and precision analog signal conditioning requiring stable component supply and traceable sourcing.

Supply support for BZX79-B33,133 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, formed in 2017 from the former NXP Standard Products division, specializing in high-volume, high-reliability components for automotive and industrial markets.

The BZX79 series belongs to Nexperia's legacy Zener diode portfolio, designed specifically for cost-sensitive, space-constrained applications demanding stable voltage references with proven long-term parametric consistency.

FAQ

What is the maximum continuous power dissipation for BZX79-B33,133 at 50 °C ambient?

The maximum continuous power dissipation is 500 mW when mounted on a PCB with leads ≤8 mm and tie-point temperature ≤50 °C, per IEC 60134 limiting values. Derating begins above 50 °C at 3.3 mW/°C based on R_{th j-a} = 380 K/W.

How is polarity identified on the BZX79-B33,133 package?

The cathode is marked by a distinct color band (typically black or dark gray) on the glass body of the SOD27 (DO-35) package. When installed, the banded end connects to the higher-potential node in reverse-bias Zener operation.

Does BZX79-B33,133 meet automotive AEC-Q200 requirements?

No - BZX79-B33,133 is not AEC-Q200 qualified. It is rated for industrial-grade operation (−65 °C to +200 °C storage, −65 °C to +200 °C junction), but lacks the stress testing, failure analysis, and qualification documentation required for automotive applications.

Can BZX79-B33,133 be used in series to achieve higher Zener voltage?

Yes - multiple BZX79-B33,133 diodes may be connected in series to increase total Zener voltage, but ensure equal current sharing using balancing resistors (≥1 kΩ) due to manufacturing spread in V_Z and r_dif, especially under temperature variation.

BZX79-B33,133 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):: 33 V

Tolerance:: ±2%

Power - Max:: 400 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 23.1 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-B33,133 FAQ

1.How can I place an order for BZX79-B33,133 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX79-B33,133 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-B33,133 reliable?

The price and inventory of BZX79-B33,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B33,133 is usually 5 days.

3.What payment methods are accepted for BZX79-B33,133?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B33,133 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX79-B33,133?

BZX79-B33,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX79-B33,133 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-B33,133?

For technical support, including BZX79-B33,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B33,133 requirements.

6.How does Aetrix verify that BZX79-B33,133 is sourced from the original manufacturer or authorized distributors?

All BZX79-B33,133 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-B33,133 meets industry standards.

7.What is the process for return or replacement of BZX79-B33,133?

All BZX79-B33,133 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B33,133, 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-B33,133 part is unused and in its original packaging.

Return procedure for BZX79-B33,133:

1.Submit a request within 90 days.

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

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