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Nexperia USA Inc. BZX79-B39,133
- Part No.:
- BZX79-B39,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B39,133.pdf
- Description:
- DIODE ZENER 39V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:9,151
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Product details
Overview
BZX79-B39,133 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal breakdown voltage of 39 V at 2 mA test current, 80 Ω typical differential resistance, and −28.7 mV/K temperature coefficient at IZ = 2 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-B39,133 datasheet, BZX79-B39,133 pinout, BZX79-B39,133 application, or BZX79-B39,133 equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance, thermal coefficient, reverse leakage at operating VR, and DO-35 package compatibility with through-hole PCB layouts.
Technical Context
This device functions as a two-terminal passive voltage reference, relying on controlled avalanche breakdown in silicon to maintain stable reverse-bias voltage across its cathode-anode terminals. Its operation requires external current limiting and is specified under DC conditions at Tj = 25 °C, with thermal derating applied above Tamb = 50 °C.
The BZX79-B39,133 exhibits a negative temperature coefficient (−28.7 mV/K), indicating decreasing Zener voltage with rising junction temperature - a critical factor in thermally coupled reference designs. Its non-repetitive peak reverse power dissipation is rated at 40 W for 100 μs pulses, supporting transient overvoltage clamping in low-energy protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 38.2 V to 39.8 V at IZ = 2 mA - defines stable regulation range for feedback or reference use |
| Differential Resistance (rdiff) | 80 Ω typical at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Temperature Coefficient (SZ) | −28.7 mV/K at IZ = 2 mA - quantifies voltage drift per degree Celsius rise in junction temperature |
| Reverse Leakage (IR) | 50 nA max at VR = 27.3 V (0.7 × VZnom) - sets minimum bias current requirement for stable regulation |
| Total Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C - limits continuous DC power handling without heatsinking |
| Junction-to-Ambient Thermal Resistance (Rth j-a) | 380 K/W - governs temperature rise under steady-state power dissipation |
Pinout & Package
Hermetically sealed glass axial-leaded SOD27 (DO-35) package with cathode indicated by a colored band. Dimensions: D = 1.85 mm max, L = 25.4 mm min, b = 0.56 mm max. Leads are tinned copper-clad steel, suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common or lower-potential rail; carries forward current during conduction |
| Cathode | Zener regulation terminal / Output reference node | Marked with band; supplies regulated voltage when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tighter output regulation in feedback loops without post-calibration trimming |
| 500 mW total power rating | Supports direct use in low-current (<10 mA) reference applications without external heat sinking |
| Non-repetitive 40 W surge capability | Provides transient overvoltage suppression in low-energy signal conditioning paths |
| −28.7 mV/K temperature coefficient | Allows predictable thermal compensation when paired with positive-TC components in reference circuits |
| DO-35 glass package with hermetic seal | Ensures long-term parameter stability and moisture resistance in industrial environments |
Applications
| Power Supply Feedback | Sensor Bias Reference |
|---|---|
Use Scenario: Regulating output voltage in linear or switching power supplies via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener diode provides precise voltage reference for TL431 or comparator input. Use Value: Tight ±2% VZ tolerance ensures output accuracy within ±1.5% over line/load/temperature without trimming. |
Use Scenario: Providing stable excitation voltage to resistive bridge sensors (e.g., strain gauges, RTDs) in data acquisition modules. IC Role / Device Role / Timing Role: Passive voltage reference establishing known bias point for ratiometric measurement. Use Value: Low 50 nA leakage at 27.3 V minimizes error contribution in high-impedance sensor interfaces. |
| Overvoltage Clamp | Analog Circuit Protection |
Use Scenario: Protecting ADC inputs or op-amp rails from transient surges in industrial control I/O modules. IC Role / Device Role / Timing Role: Clamping element shunting excess energy to ground during ESD or inductive kick events. Use Value: 40 W non-repetitive peak power rating handles 100 μs transients up to 1.2 kV without degradation. |
Use Scenario: Stabilizing bias points in audio preamplifier stages or precision instrumentation amplifiers. IC Role / Device Role / Timing Role: Low-noise voltage reference setting quiescent operating point for active devices. Use Value: 80 Ω differential resistance ensures minimal AC impedance variation across operating current 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 |
|---|---|---|---|
| 1N4739A | Same 39 V nominal VZ, but ±5% tolerance and higher rdiff (90 Ω typ) | Less precise regulation; suitable where cost outweighs accuracy | Select when ±5% tolerance is acceptable and legacy design reuse is required |
| BZX84-C39 | SOT-23 surface-mount package; same ±5% tolerance; lower Ptot (300 mW) | Not interchangeable due to package and power rating mismatch | Choose only for space-constrained PCBs where rework and thermal management allow SMT integration |
Compared with 1N4739A and BZX84-C39, the BZX79-B39,133 offers superior voltage accuracy and higher surge robustness in a proven through-hole package - making it optimal for industrial-grade analog references where long-term stability and repairability matter.
Availability
BZX79-B39,133 is available at Aetrix Electronics and suitable for industrial sensor interfaces, power supply feedback networks, analog circuit protection, and overvoltage clamp circuits requiring stable component supply and long-lifecycle support.
Supply support for BZX79-B39,133 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, formed in 2017 from the former NXP Standard Products division.
The BZX79 series belongs to Nexperia's voltage regulator diode product line, engineered for precision low-power voltage referencing and stabilization in automotive, industrial, and consumer electronics.
FAQ
What is the maximum continuous reverse current this diode can handle?
The BZX79-B39,133 has no specified maximum continuous reverse current - instead, it is limited by power dissipation. At Tamb = 50 °C, Ptot = 500 mW implies a maximum average reverse current of ~12.8 mA (500 mW ÷ 39 V). Exceeding this risks thermal runaway and permanent damage.
Can this Zener diode be used in series or parallel configurations?
Series connection is permissible for higher reference voltages, provided current matching and thermal coupling are managed. Parallel use is strongly discouraged due to mismatched VZ and thermal coefficients, which cause current hogging and potential failure of one device.
Is the cathode marking visible on the physical device?
Yes - the cathode is identified by a distinct color band (typically black or dark gray) near one end of the DO-35 glass body. This band aligns with the cathode terminal in all official Nexperia package drawings and application schematics.
How does temperature affect regulation accuracy in practical circuits?
With a −28.7 mV/K coefficient, a 10 °C junction temperature rise causes ~287 mV drop in VZ. In practice, this means regulation shifts by ~0.74% per 10 °C - requiring thermal isolation or compensation if sub-1% accuracy is needed over wide ambient ranges.
BZX79-B39,133 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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-B39,133 FAQ
1.How can I place an order for BZX79-B39,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B39,133 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-B39,133 reliable?
The price and inventory of BZX79-B39,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B39,133 is usually 5 days.
3.What payment methods are accepted for BZX79-B39,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B39,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B39,133?
BZX79-B39,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B39,133 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-B39,133?
For technical support, including BZX79-B39,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B39,133 requirements.
6.How does Aetrix verify that BZX79-B39,133 is sourced from the original manufacturer or authorized distributors?
All BZX79-B39,133 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-B39,133 meets industry standards.
7.What is the process for return or replacement of BZX79-B39,133?
All BZX79-B39,133 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B39,133, 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-B39,133 part is unused and in its original packaging.
Return procedure for BZX79-B39,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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