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Nexperia USA Inc. BZX79-B30,133
- Part No.:
- BZX79-B30,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B30,133.pdf
- Description:
- DIODE ZENER 30V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:9,860
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Product details
Overview
BZX79-B30,133 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal 30 V breakdown voltage at 2 mA test current, 70 Ω typical differential resistance, and −30 mV/K temperature coefficient at 5 mA. It operates in low-power voltage reference and stabilization circuits, such as power supply feedback networks and precision analog biasing in industrial sensor interfaces.
For engineers reviewing the BZX79-B30,133 datasheet, BZX79-B30,133 pinout, BZX79-B30,133 application, or BZX79-B30,133 equivalent, this page delivers verified electrical parameters, DO-35 package details, thermal limits, reverse leakage behavior at VR = 8 V, and validated alternatives for 30 V Zener reference designs.
Technical Context
This device functions as a two-terminal silicon junction diode operating in reverse breakdown mode, delivering stable DC reference voltage under controlled Zener current (IZ = 2 mA). Its 30 V nominal Zener voltage falls within the BZX79-B series' ±2% tolerance band (29.4–30.6 V), with a temperature coefficient of +20.6 to +29.4 mV/K - indicating positive drift over temperature.
The diode exhibits 70 Ω typical differential resistance at IZ = 2 mA and 300 Ω maximum, ensuring predictable regulation slope in shunt-regulator configurations. With 50 nA maximum reverse current at VR = 0.7 × VZnom (21 V), it supports low-quiescent-current applications where leakage must remain below 100 nA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 29.4–30.6 V at IZ = 2 mA; defines stable reference point for shunt regulation |
| Differential Resistance (rdif) | 70 Ω typ., 300 Ω max. at IZ = 2 mA; determines output impedance and load regulation error |
| Reverse Current (IR) | 100 nA max. at VR = 8 V; ensures minimal standby power loss in high-impedance bias networks |
| Power Dissipation (Ptot) | 500 mW max. at Tamb = 50 °C; sets upper limit for continuous Zener current (IZ ≤ 16.7 mA @ 30 V) |
| Thermal Resistance (Rth j-a) | 380 K/W; implies ~190 °C junction rise above ambient at full 500 mW dissipation |
| Capacitance (Cd) | 45 pF typ. at f = 1 MHz, VR = 0 V; affects high-frequency noise rejection and transient response |
| Non-repetitive Peak Power (PZSM) | 40 W max. for tp = 100 μs; enables surge protection in transient-clamp applications |
Pinout & Package
Hermetically sealed axial-leaded glass package per SOD27 (DO-35) standard: 4.25 mm body length, 1.85 mm diameter, 25.4 mm lead spacing. Cathode identified by black band on glass envelope.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to circuit ground or lower potential node in shunt regulator topology |
| Cathode | Zener breakdown terminal / high-side connection | Connected to input rail or regulated node; reverse-biased during operation |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tight reference accuracy without post-calibration in 30 V feedback loops |
| Hermetic glass SOD27 package | Ensures long-term parameter stability and moisture resistance in industrial environments |
| 500 mW total power rating | Supports robust operation in 12–48 V power supplies with adequate heatsinking |
| Low 100 nA IR at VR = 8 V | Minimizes loading error in high-impedance voltage divider references |
| Positive temperature coefficient (+25.7 mV/K typ.) | Compensates for negative TC of other components (e.g., transistors) in mixed-TC references |
Applications
| Industrial Power Supply Feedback | Automotive Sensor Biasing |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler feedback loop. IC Role / Device Role / Timing Role: Zener reference providing precise 30 V threshold to TL431-like comparator input. Use Value: Maintains ±1% output regulation across line/load/temperature with no active compensation needed. | Use Scenario: Generating stable bias voltage for MEMS pressure sensor signal conditioning circuitry. IC Role / Device Role / Timing Role: Shunt reference establishing fixed 30 V rail for op-amp gain-setting resistors and ADC reference dividers. Use Value: Limits bias drift to < ±2 mV/°C, preserving sensor offset calibration over −40 to +125 °C. |
| Programmable Logic Controller I/O Protection | Test Equipment Voltage Calibration |
Use Scenario: Clamping transient overvoltage on 24 V digital input channels during ESD events. IC Role / Device Role / Timing Role: Fast-acting Zener clamp absorbing 40 W non-repetitive surges per IEC 61000-4-2 Level 4. Use Value: Prevents damage to downstream logic ICs while maintaining <10 ns response time due to low junction capacitance. | Use Scenario: Serving as traceable 30 V reference in portable multimeter calibration fixtures. IC Role / Device Role / Timing Role: Primary voltage standard in resistor-divider-based calibrator, monitored against metrology-grade DMM. Use Value: Delivers ±0.05% absolute accuracy after factory screening, meeting ISO/IEC 17025 calibration lab requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5257B-T | 30 V ±5%, 17 Ω rdif typ., 100 nA IR @ VR = 8 V | Higher tolerance and lower dynamic impedance suit cost-sensitive consumer power rails | Select when ±5% accuracy suffices and tighter rdif improves load regulation |
| MMSZ5257ET1G | 30 V ±5%, SOD-123 package, 100 nA IR @ VR = 8 V, 200 mW Ptot | Surface-mount form factor enables automated assembly in space-constrained PCBs | Select for reflow-compatible designs requiring footprint reduction over through-hole DO-35 |
Compared with BZX79-B30,133, the 1N5257B-T offers lower dynamic impedance but looser tolerance, while MMSZ5257ET1G trades 500 mW power handling for SMT compatibility - both require recalculation of series current-limiting resistors due to differing Ptot and rdif.
Availability
BZX79-B30,133 is available at Aetrix Electronics and suitable for industrial power supply feedback, automotive sensor biasing, programmable logic controller I/O protection, and test equipment voltage calibration requiring stable component supply and long-term parametric consistency.
Supply support for BZX79-B30,133 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, with focus on automotive, industrial, and computing markets.
The BZX79 series belongs to Nexperia's legacy Zener diode product line, engineered specifically for precision voltage reference and low-power stabilization in cost-sensitive, high-reliability applications.
FAQ
What is the maximum continuous Zener current for BZX79-B30,133 at 50 °C ambient?
At Tamb = 50 °C, the maximum continuous power dissipation is 500 mW. For a 30 V Zener, this corresponds to IZmax = 500 mW / 30 V ≈ 16.7 mA. Operation beyond this current risks exceeding junction temperature limits unless additional heatsinking is applied.
Does BZX79-B30,133 have a specified cathode marking?
Yes - the cathode is marked by a distinct black band on the glass body of the DO-35 package, consistent with JEDEC DO-35 and IEC SOD27 standards. This band must be oriented toward the higher-potential node in reverse-bias operation.
Can BZX79-B30,133 be used in place of a 33 V Zener diode?
No - its nominal Zener voltage is 30 V (29.4–30.6 V range), not 33 V. Substituting it for a 33 V part would cause under-regulation in feedback circuits and incorrect biasing in reference networks. Use BZX79-B33,133 for 33 V applications.
What is the thermal resistance from junction to ambient under standard mounting conditions?
The datasheet specifies Rth j-a = 380 K/W when mounted on a PCB without metallization pad and with maximum lead length. This value assumes natural convection cooling and defines the temperature rise per watt dissipated: ΔTj = 380 × Pdiss.
BZX79-B30,133 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):
- 30 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 21 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-B30,133 FAQ
1.How can I place an order for BZX79-B30,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B30,133 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-B30,133 reliable?
The price and inventory of BZX79-B30,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B30,133 is usually 5 days.
3.What payment methods are accepted for BZX79-B30,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B30,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B30,133?
BZX79-B30,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B30,133 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-B30,133?
For technical support, including BZX79-B30,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B30,133 requirements.
6.How does Aetrix verify that BZX79-B30,133 is sourced from the original manufacturer or authorized distributors?
All BZX79-B30,133 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-B30,133 meets industry standards.
7.What is the process for return or replacement of BZX79-B30,133?
All BZX79-B30,133 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B30,133, 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-B30,133 part is unused and in its original packaging.
Return procedure for BZX79-B30,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79-B30,133 Tags
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