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Nexperia USA Inc. BZX79-B47,133
- Part No.:
- BZX79-B47,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B47,133.pdf
- Description:
- DIODE ZENER 47V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:30,000
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Product details
Overview
BZX79-B47,133 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal 47 V breakdown voltage at 2 mA test current, 85 Ω typical differential resistance, and −1.4 mV/K temperature coefficient at 5 mA. It operates in hermetically sealed SOD27 (DO-35) glass package, rated for 500 mW total power dissipation at 50 °C ambient, and serves as a precision low-power voltage reference in analog signal conditioning circuits.
For engineers reviewing the BZX79-B47,133 datasheet, BZX79-B47,133 pinout, BZX79-B47,133 application, or BZX79-B47,133 equivalent, this part is selected for stable 47 V regulation in low-current bias networks, feedback loops of linear regulators, and overvoltage protection clamping where tight voltage tolerance and predictable thermal drift are required.
Technical Context
This Zener diode functions in reverse-biased avalanche mode, delivering regulated voltage across its cathode–anode terminals when reverse current exceeds the knee threshold. Its 47 V nominal Zener voltage is specified at IZtest = 2 mA per Table 2, with 50 Ω maximum differential resistance ensuring minimal voltage shift under load variation.
The device exhibits a negative temperature coefficient of −1.4 mV/K at 5 mA, indicating decreasing Zener voltage with rising junction temperature - a critical factor in thermally coupled reference designs. Its 40 pF capacitance at 0 V reverse bias and 1 MHz enables use in moderate-frequency stabilization without significant phase lag.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 46.1 V to 47.9 V at IZ = 2 mA - defines precise regulation window for feedback or clamping |
| Differential Resistance (rdif) | 85 Ω typical at IZ = 2 mA - determines output impedance and load regulation error |
| Temperature Coefficient (SZ) | −1.4 mV/K at IZ = 5 mA - quantifies voltage drift vs. junction temperature change |
| Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C - sets maximum continuous reverse power before thermal runaway |
| Reverse Current (IR) | 50 nA max. at VR = 0.7 × VZnom = 32.9 V - ensures low leakage in high-impedance bias networks |
| Junction-to-Ambient Rth | 380 K/W - defines thermal rise per watt; requires PCB layout consideration for sustained operation |
Pinout & Package
Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode indicated by a colored band on one end. Leads are tinned copper-clad steel, suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse bias reference node | Connected to lower-potential side in Zener configuration; establishes reference ground reference point |
| Cathode | Forward current exit / Zener voltage output node | Marked end; delivers regulated 47 V relative to anode when reverse biased above breakdown |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables accurate voltage setting without post-production trimming in precision references |
| Hermetic glass SOD27 package | Ensures long-term parameter stability and moisture resistance in industrial environments |
| 500 mW power rating at 50 °C | Supports reliable operation in compact PCB layouts without forced cooling |
| Low 50 nA reverse leakage at 32.9 V | Minimizes error current in high-impedance divider networks and sensor biasing |
Applications
| Industrial Sensor Signal Conditioning | Linear Regulator Feedback Reference |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure transducers operating in 0–85 °C ambient. IC Role / Device Role / Timing Role: Zener diode provides fixed 47 V reference for op-amp gain-setting network. Use Value: Tight ±2% tolerance and −1.4 mV/K TC ensure <±0.5% total reference error across temperature range. | Use Scenario: Setting output voltage of discrete NPN pass transistor regulator for 45 V rail. IC Role / Device Role / Timing Role: Acts as shunt reference in feedback divider tied to base of series pass transistor. Use Value: 85 Ω rdif limits output voltage deviation to <0.1 V under 1 mA load step changes. |
| Overvoltage Clamp for Microcontroller I/O | ADC Reference Voltage Derivation |
Use Scenario: Protecting 3.3 V GPIO pins against accidental 48 V supply misconnection. IC Role / Device Role / Timing Role: Cathode tied to protected line, anode to ground; clamps transient above 47 V. Use Value: 40 W non-repetitive peak power rating absorbs 100 μs surges without failure. | Use Scenario: Generating stable 47 V reference for 16-bit SAR ADC requiring >100 kΩ input impedance. IC Role / Device Role / Timing Role: Supplies regulated voltage to resistive divider feeding ADC REF+ pin. Use Value: 50 nA leakage introduces <0.005% gain error in 1 MΩ divider network. |
Availability
BZX79-B47,133 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, linear regulator feedback reference, and overvoltage clamp applications requiring stable component supply and long-lifecycle support.
Supply support for BZX79-B47,133 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 high-volume discrete, logic, and PowerMOS semiconductors, serving automotive, industrial, computing, and consumer markets with robust, scalable components.
The BZX79 series belongs to Nexperia's standard voltage regulator diode product line, engineered for precision low-power voltage referencing and clamping in cost-sensitive, reliability-critical applications.
FAQ
What is the maximum continuous reverse current for BZX79-B47,133 at 47 V?
The device does not specify a maximum continuous reverse current at exactly 47 V. Instead, its safe operating area is defined by total power dissipation: at 50 °C ambient, maximum continuous reverse power is 500 mW, limiting average reverse current to approximately 10.6 mA (500 mW ÷ 47 V). Exceeding this risks thermal runaway due to 380 K/W junction-to-ambient thermal resistance.
Can BZX79-B47,133 replace BZX79-C47 in a circuit?
No - BZX79-B47,133 has ±2% tolerance (46.1–47.9 V), while BZX79-C47 has approx. ±5% tolerance (44–50 V). Substituting introduces up to ±3% additional voltage uncertainty and may violate regulation accuracy requirements in precision feedback or reference applications.
Is the SOD27 package RoHS compliant?
Yes - Nexperia confirms RoHS compliance for the SOD27 package used in BZX79-B47,133, including lead-free terminations and exemption-compliant materials per Directive 2011/65/EU Annex II, with full declaration available in Nexperia's material compliance database.
What is the typical Zener impedance at 1 mA for this part?
Per Table 2, differential resistance (rdif) is specified at IZ = 2 mA (85 Ω typical, 375 Ω max). At 1 mA, impedance rises significantly - typical rdif is ~120 Ω based on Fig.5/6 extrapolation and Zener physics, confirming higher dynamic impedance near knee current.
BZX79-B47,133 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 47 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 170 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.9 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-B47,133 FAQ
1.How can I place an order for BZX79-B47,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B47,133 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-B47,133 reliable?
The price and inventory of BZX79-B47,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B47,133 is usually 5 days.
3.What payment methods are accepted for BZX79-B47,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B47,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B47,133?
BZX79-B47,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B47,133 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-B47,133?
For technical support, including BZX79-B47,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B47,133 requirements.
6.How does Aetrix verify that BZX79-B47,133 is sourced from the original manufacturer or authorized distributors?
All BZX79-B47,133 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-B47,133 meets industry standards.
7.What is the process for return or replacement of BZX79-B47,133?
All BZX79-B47,133 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B47,133, 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-B47,133 part is unused and in its original packaging.
Return procedure for BZX79-B47,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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