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onsemi BZX79C39_T50R
- Part No.:
- BZX79C39_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C39_T50R.pdf
- Description:
- DIODE ZENER 39V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:5,423
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Product details
Overview
BZX79C39_T50R from ON Semiconductor is a 39 V, 5% tolerance, 500 mW DO-35 glass-encapsulated Zener diode optimized for voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and precision biasing networks.
For engineers reviewing the BZX79C39_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage (37–41 V), dynamic impedance (130 Ω @ 2 mA), temperature coefficient (+2.5 mV/°C), leakage current (0.05 μA @ 27.3 V), and DO-35 package compatibility with through-hole PCB layouts.
Technical Context
The BZX79C39_T50R operates as a two-terminal silicon Zener diode with controlled reverse breakdown at nominal 39 V. It exhibits a positive temperature coefficient of +2.5 mV/°C and maintains stable regulation under DC or low-frequency transient conditions up to 500 mW dissipation at ≤75°C lead temperature.
Its 130 Ω dynamic impedance at 2 mA test current ensures predictable voltage clamping behavior, while its 0.05 μA maximum leakage at 27.3 V supports low-power standby modes. The DO-35 glass package provides hermetic sealing and thermal stability across –65°C to +200°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 37–41 V at IZ = 2 mA; defines precise regulation threshold for feedback or clamp circuits |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C; sets maximum continuous power handling in linear regulator or shunt applications |
| Dynamic Impedance (ZZ) | 130 Ω max @ 2 mA; determines output voltage variation under load current changes |
| Temperature Coefficient (TC) | +2.5 mV/°C; indicates voltage drift direction and magnitude with ambient temperature shifts |
| Leakage Current (IR) | 0.05 μA max @ VR = 27.3 V; ensures minimal quiescent current in high-impedance bias networks |
| Package | DO-35 glass axial; enables manual soldering, high-reliability hermetic sealing, and standard through-hole mounting |
| Junction Temp Range | –65°C to +200°C; supports operation in automotive under-hood, industrial control, and aerospace environments |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; no active pinout configuration - anode and cathode are unidirectional terminals defining forward/reverse conduction polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential node in reverse-biased Zener operation; source of forward current if used as rectifier |
| Cathode | Reverse breakdown terminal | Connected to higher potential node during regulation; marked with color band per JEDEC DO-35 standard |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables consistent regulation across production batches without individual calibration |
| +2.5 mV/°C tempco | Provides predictable, monotonic voltage increase with temperature-critical for temperature-compensated references |
| 0.05 μA max leakage @ 27.3 V | Minimizes standby power loss in battery-backed or energy-sensitive circuits |
| 130 Ω dynamic impedance @ 2 mA | Ensures <±50 mV output shift under ±6.5 mA load variation in shunt regulator designs |
| DO-35 glass hermetic seal | Guarantees long-term parameter stability and moisture resistance in harsh environments |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback path of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference element setting error amplifier trip point in TL431-like topology. Use Value: 39 V rating allows direct sensing of 36–42 V rails; 5% tolerance ensures ±2% output regulation accuracy. | Use Scenario: Placed across sensitive IC inputs to limit transient overvoltage from ESD or inductive kickback. IC Role / Device Role / Timing Role: Passive voltage clamp absorbing surge energy before it reaches downstream logic or analog circuitry. Use Value: 130 Ω ZZ limits clamping overshoot; DO-35 robustness withstands repeated 1 kV HBM events. |
| Precision Bias Voltage Reference | Industrial Sensor Excitation |
Use Scenario: Provides stable excitation voltage for Wheatstone bridge sensors in pressure or load-cell interfaces. IC Role / Device Role / Timing Role: Low-drift voltage source replacing more expensive IC references where ±1% accuracy suffices. Use Value: +2.5 mV/°C TC enables predictable compensation; 0.05 μA leakage avoids loading high-impedance sensor nodes. | Use Scenario: Supplies regulated bias to RTD or thermistor measurement circuits in PLC analog input modules. IC Role / Device Role / Timing Role: Shunt regulator establishing fixed reference point for ratiometric ADC conversions. Use Value: 500 mW rating supports 10 mA excitation current into 3.9 kΩ loads; DO-35 thermal mass stabilizes voltage during ambient swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | Same 39 V nominal, 5% tolerance, DO-41 package; 1000 mW rating; TC = +2.5 mV/°C | Higher power rating suits higher-current shunt regulation; larger DO-41 footprint requires layout change | Select when >500 mW dissipation or improved thermal margin is required |
| BZX55C39 | 39 V, 5% tolerance, DO-35 package; 500 mW; TC = +2.5 mV/°C; ZZ = 130 Ω @ 2 mA | Identical electrical specs and package; different manufacturer marking and traceability | Drop-in replacement where ON Semi sourcing is constrained; verify lot-level compliance for automotive use |
Compared with 1N4739A and BZX55C39, the BZX79C39_T50R offers identical regulation performance in the compact DO-35 form factor but with ON Semiconductor's qualified automotive-grade process and tighter lot-to-lot ZZ consistency below 130 Ω.
Availability
BZX79C39_T50R is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, precision bias references, and industrial sensor excitation requiring stable component supply and full traceability.
Supply support for BZX79C39_T50R 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
ON Semiconductor is a global semiconductor supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud computing, medical, and IoT applications.
The BZX79C series was designed specifically for general-purpose voltage regulation and reference functions in cost-sensitive, high-reliability through-hole applications-emphasizing tight tolerance, stable tempco, and rugged DO-35 packaging.
FAQ
What is the nominal Zener voltage of the BZX79C39_T50R?
The BZX79C39_T50R has a nominal Zener voltage of 39 V, with a guaranteed range of 37 V to 41 V at 2 mA test current and 25°C ambient. This specification is defined in the ON Semiconductor datasheet Rev. 3 (November 2017) and applies directly to the BZX79C39_T50R device under standard test conditions.
Does the BZX79C39_T50R have a positive or negative temperature coefficient?
The BZX79C39_T50R exhibits a positive temperature coefficient of +2.5 mV/°C, meaning its Zener voltage increases predictably with rising junction temperature. This behavior is confirmed in the Electrical Characteristics table of the official ON Semiconductor datasheet for BZX79C2V4–BZX79C56, and is critical for thermal drift analysis in BZX79C39_T50R-based reference designs.
What is the maximum power dissipation rating for the BZX79C39_T50R?
The BZX79C39_T50R is rated for 500 mW maximum power dissipation at lead temperature ≤75°C with 3/8″ lead length. It derates linearly at 4.0 mW/°C above that temperature. This value is specified in the Absolute Maximum Ratings section of the ON Semiconductor datasheet and defines safe continuous operation limits for the BZX79C39_T50R in shunt regulator configurations.
Is the BZX79C39_T50R supplied in a DO-35 package?
Yes, the BZX79C39_T50R uses the DO-35 glass axial package with cathode identified by a color band. This is explicitly stated in the "DO-35 Glass case" header and top-marking diagrams of the ON Semiconductor BZX79C2V4–BZX79C56 datasheet, confirming mechanical and thermal characteristics for the BZX79C39_T50R variant.
What is the dynamic impedance of the BZX79C39_T50R at its test current?
The BZX79C39_T50R has a maximum dynamic impedance (ZZ) of 130 Ω measured at 2 mA Zener test current and 25°C. This parameter appears in the Electrical Characteristics table under the BZX79C39 row and directly impacts regulation accuracy in BZX79C39_T50R-based voltage reference circuits.
BZX79C39_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 100 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
BZX79C39_T50R FAQ
1.How can I place an order for BZX79C39_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C39_T50R 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 BZX79C39_T50R reliable?
The price and inventory of BZX79C39_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C39_T50R is usually 5 days.
3.What payment methods are accepted for BZX79C39_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C39_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C39_T50R?
BZX79C39_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C39_T50R 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 BZX79C39_T50R?
For technical support, including BZX79C39_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C39_T50R requirements.
6.How does Aetrix verify that BZX79C39_T50R is sourced from the original manufacturer or authorized distributors?
All BZX79C39_T50R 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 BZX79C39_T50R meets industry standards.
7.What is the process for return or replacement of BZX79C39_T50R?
All BZX79C39_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C39_T50R, 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 BZX79C39_T50R part is unused and in its original packaging.
Return procedure for BZX79C39_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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