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Nexperia USA Inc. BZX79-B3V3,133
- Part No.:
- BZX79-B3V3,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B3V3,133.pdf
- Description:
- DIODE ZENER 3.3V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:1,175
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Product details
Overview
BZX79-B3V3,133 from Nexperia is a ±2% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, rated for 3.3 V nominal stabilization at 5 mA test current, with 350 Ω typical differential resistance and −2.4 mV/K temperature coefficient. It delivers stable low-voltage reference in power supply feedback loops, sensor biasing, and overvoltage protection circuits.
For engineers reviewing the BZX79-B3V3,133 datasheet, BZX79-B3V3,133 pinout, BZX79-B3V3,133 application, or BZX79-B3V3,133 equivalent, this page provides verified electrical parameters, thermal behavior, reverse leakage at 1 V (5 μA max), non-repetitive surge capability (6.0 A), and direct substitution guidance against industry-standard 3.3 V Zeners.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining a stable 3.3 V output across its cathode-anode terminals under reverse-biased conditions when current exceeds the knee threshold (~1 mA). Its low 5 μA reverse leakage at VR = 1 V ensures minimal standby power loss in precision bias networks.
The diode's −2.4 mV/K temperature coefficient indicates predictable, slightly negative drift over temperature-critical for applications requiring stable references across −65 °C to +200 °C operating range. Its 350 Ω differential resistance at 5 mA defines regulation stiffness and load transient response in simple linear regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 3.3 V at IZ = 5 mA - defines precise regulation point for low-voltage reference design |
| Voltage Tolerance | ±2% - enables tight-specified feedback paths without post-calibration |
| Differential Resistance (rdif) | 350 Ω max at 5 mA - determines output impedance and load regulation error |
| Reverse Leakage Current (IR) | 5 μA max at VR = 1 V - limits quiescent current in always-on bias circuits |
| Non-repetitive Peak Reverse Current (IZSM) | 6.0 A at tp = 100 μs - supports transient overvoltage clamping in ESD-sensitive nodes |
| Total Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C - sets maximum continuous DC power handling on standard PCB |
| Temperature Coefficient (SZ) | −2.4 mV/K at 5 mA - quantifies voltage drift per degree, enabling thermal error budgeting |
Pinout & Package
Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode indicated by a colored band. Dimensions: D = 4.25 mm max, L = 25.4 mm min, b = 0.56 mm max, G1 = 1.85 mm max. Lead spacing accommodates standard through-hole PCB mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to system ground or low-side return; carries forward current up to 250 mA |
| Cathode | Zener regulation terminal / stabilized output node | Connected to regulated rail; sinks reverse current to maintain 3.3 V under load or surge |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass packaging | Ensures long-term parameter stability and moisture resistance in industrial environments |
| Low 5 μA reverse leakage at 1 V | Minimizes standby current in battery-powered sensor references and portable devices |
| −2.4 mV/K tempco at 5 mA | Enables predictable, compensated voltage drift in temperature-critical analog front-ends |
| 6.0 A non-repetitive surge rating | Provides robust transient suppression without external TVS in cost-sensitive designs |
| 350 Ω differential resistance | Delivers adequate regulation line/load regulation for <10 mA load variations |
Applications
| Power Supply Feedback Reference | Sensor Biasing Network |
|---|---|
Use Scenario: Used in the feedback divider of a 3.3 V linear regulator IC to set output voltage precisely. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 3.3 V reference point for error amplifier comparison. Use Value: ±2% tolerance eliminates need for trimmer resistors; low tempco reduces output drift over −40 °C to +85 °C ambient. | Use Scenario: Supplies bias current to a silicon photodiode in an optical smoke detector. IC Role / Device Role / Timing Role: Low-noise, stable voltage source establishing reverse-bias potential across photodiode junction. Use Value: 5 μA max leakage prevents signal corruption; hermetic package ensures reliability over 10-year field life. |
| Overvoltage Clamp for MCU I/O | ADC Reference Stabilization |
Use Scenario: Placed between microcontroller GPIO and chassis ground to clamp ESD transients. IC Role / Device Role / Timing Role: Fast-acting shunt protector limiting pin voltage to 3.3 V during 8 kV HBM events. Use Value: 6.0 A peak surge rating handles IEC 61000-4-2 Level 4 pulses without degradation. | Use Scenario: Stabilizes reference input of a 12-bit SAR ADC in a precision data acquisition module. IC Role / Device Role / Timing Role: Low-drift voltage reference ensuring <±0.5 LSB integral nonlinearity over temperature. Use Value: −2.4 mV/K tempco contributes <±0.1% full-scale error across 0–70 °C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5226BS-7-F (Diodes Inc.) | Same 3.3 V/±5%, SOT-23 package, 150 mW Ptot, higher 10 μA IR at 1 V | Suitable only for space-constrained PCBs; lower power rating limits continuous use in >5 mA bias networks | Select when board area is critical and thermal derating allows 150 mW operation |
| 1N4728A (ON Semiconductor) | 3.3 V/±5%, DO-41 package, 1 W Ptot, 500 Ω rdif, 100 nA IR at 1 V | Better leakage and power handling, but larger footprint and looser tolerance than BZX79-B3V3,133 | Select when ultra-low leakage or higher surge energy absorption is required, and ±5% tolerance is acceptable |
Compared with MMBZ5226BS-7-F and 1N4728A, BZX79-B3V3,133 offers tighter ±2% tolerance and 500 mW power in the compact DO-35 form factor-ideal for cost-sensitive, medium-precision analog references where leakage and tempco are balanced trade-offs.
Availability
BZX79-B3V3,133 is available at Aetrix Electronics and suitable for low-voltage reference design, sensor biasing, and ESD protection requiring stable component supply in industrial control, automotive body electronics, and consumer IoT end equipment.
Supply support for BZX79-B3V3,133 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, 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, engineered for cost-effective, stable voltage regulation in general-purpose analog circuits where precision, reliability, and manufacturability are prioritized.
FAQ
What is the maximum continuous reverse current for reliable long-term operation?
The BZX79-B3V3,133 is rated for 500 mW total power dissipation at 50 °C ambient, corresponding to ~152 mA continuous reverse current (3.3 V × 0.152 A). Derating is required above 50 °C per the 380 K/W junction-to-ambient thermal resistance; sustained operation above 100 mA at room temperature is not recommended without heatsinking.
Does this Zener diode require a series current-limiting resistor in all applications?
Yes-a series resistor is mandatory to limit reverse current to within safe operating limits. For example, with a 5 V supply and 3.3 V Zener, a minimum 110 Ω resistor limits current to 15 mA at full supply, staying well below the 250 mA absolute maximum forward current and avoiding thermal runaway at the specified 350 Ω differential resistance.
How does the −2.4 mV/K temperature coefficient affect circuit accuracy over temperature?
At 3.3 V nominal, −2.4 mV/K translates to −0.073% per °C drift. Over a 100 °C range (−25 °C to +75 °C), this yields ~−240 mV total shift, or −7.3% of nominal voltage. Designers must include this drift in total error budgets for precision references, especially when used without compensation networks or trimming.
Can BZX79-B3V3,133 be used in place of a 3.3 V TVS diode for ESD protection?
No-it is not rated or characterized for ESD immunity standards like IEC 61000-4-2. While it can clamp short-duration surges up to 6.0 A (100 μs), its slow response time and lack of defined clamping voltage at fast transients make it unsuitable as a dedicated ESD protector. Use purpose-built TVS diodes such as PESD3V3L1BA for compliant protection.
BZX79-B3V3,133 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):
- 3.3 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 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-B3V3,133 FAQ
1.How can I place an order for BZX79-B3V3,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B3V3,133 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-B3V3,133 reliable?
The price and inventory of BZX79-B3V3,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B3V3,133 is usually 5 days.
3.What payment methods are accepted for BZX79-B3V3,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B3V3,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B3V3,133?
BZX79-B3V3,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B3V3,133 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-B3V3,133?
For technical support, including BZX79-B3V3,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B3V3,133 requirements.
6.How does Aetrix verify that BZX79-B3V3,133 is sourced from the original manufacturer or authorized distributors?
All BZX79-B3V3,133 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-B3V3,133 meets industry standards.
7.What is the process for return or replacement of BZX79-B3V3,133?
All BZX79-B3V3,133 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B3V3,133, 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-B3V3,133 part is unused and in its original packaging.
Return procedure for BZX79-B3V3,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79-B3V3,133 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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