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onsemi BZX79C10-T50A
- Part No.:
- BZX79C10-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C10-T50A.pdf
- Description:
- DIODE ZENER 10V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,982
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Product details
Overview
BZX79C10-T50A from ON Semiconductor is a 10 V, ±5% tolerance, 500 mW glass-passivated Zener diode in DO-35 package, rated for 5 mA test current, 20 Ω dynamic impedance, and 0.2 μA leakage at 7.6 V, widely used for voltage regulation and reference in power supply feedback loops.
For engineers reviewing the BZX79C10-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, power derating above 75°C, thermal stability (TC = +4.5 mV/°C), junction capacitance (70 pF at 0 V), and DO-35 mechanical compatibility with through-hole PCB layouts.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load or line conditions. It features a glass-passivated junction for enhanced reliability and moisture resistance, with thermal characteristics defined over -65°C to +200°C operating range and 500 mW power dissipation at TL ≤ 75°C.
The device exhibits a positive temperature coefficient of +4.5 mV/°C near 10 V, indicating voltage increases with temperature - a critical factor in precision reference designs where thermal drift compensation is required. Its 70 pF junction capacitance at 0 V and 1.5 V forward voltage max at 100 mA support both regulation and low-frequency signal clamping roles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.4 V min / 10.6 V max at IZ = 5 mA - defines usable regulation window for 10 V nominal reference |
| Tolerance | ±5% - sets absolute accuracy bound for voltage-sensitive analog circuits |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - limits continuous power handling without heatsinking |
| Dynamic Impedance (ZZ) | 20 Ω max at IZ = 5 mA - determines regulation stiffness against load current changes |
| Leakage Current (IR) | 0.2 μA max at VR = 7.6 V - ensures minimal error current in high-impedance bias networks |
| Temperature Coefficient (TC) | +4.5 mV/°C - quantifies voltage drift per degree rise, critical for thermal design margining |
| Junction Capacitance (CJ) | 70 pF at VR = 0 V, f = 1 MHz - affects high-frequency noise filtering and transient response |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no orientation-specific PCB footprint beyond standard 0.4 mm lead diameter and 2.5 mm body diameter.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference ground node | Connected to lower-potential side in shunt regulator; establishes reference return path |
| Cathode | Zener voltage output terminal / Reverse breakdown anode | Provides regulated 10 V output when biased above breakdown; marked with color band |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivation | Enhances long-term stability and humidity resistance vs. epoxy-coated alternatives |
| ±5% voltage tolerance | Enables cost-effective use in non-critical regulation without trimming or calibration |
| 500 mW power rating | Supports direct replacement of legacy 1N47xx series in existing 0.5 W designs |
| +4.5 mV/°C TC | Allows predictable thermal drift modeling in temperature-compensated references |
| DO-35 mechanical standardization | Ensures compatibility with automated axial insertion equipment and legacy board tooling |
Applications
| Switch-Mode Power Supply Feedback | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Provides precise 10 V reference for optocoupler-based feedback in offline AC/DC converters. IC Role / Device Role / Timing Role: Shunt voltage reference establishing secondary-side regulation threshold. Use Value: Enables stable output voltage control within ±5% despite input line variation and load transients. | Use Scenario: Generates clean reset signal for 3.3 V or 5 V microcontrollers during brown-out events. IC Role / Device Role / Timing Role: Threshold detector clamping reset line until supply reaches valid level. Use Value: Delivers deterministic release timing with <0.2 μA leakage ensuring minimal quiescent current drain. |
| Industrial Sensor Signal Conditioning | LED Constant-Current Bias Reference |
Use Scenario: Supplies stable excitation voltage to resistive bridge sensors in 4–20 mA transmitter modules. IC Role / Device Role / Timing Role: Precision voltage source for ratiometric measurement integrity. Use Value: Maintains <±0.5% full-scale error contribution over -40°C to +85°C ambient due to known TC behavior. | Use Scenario: Sets reference voltage for op-amp-controlled LED driver current mirrors. IC Role / Device Role / Timing Role: Stable voltage reference defining current setpoint in analog bias loop. Use Value: Ensures <2% LED brightness variation across 10–30 V input range using 20 Ω ZZ regulation stiffness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4740A | Same 10 V nominal, ±5%, DO-41 package; 1.0 W rating vs. 0.5 W | Higher power handling enables higher current regulation without derating | Select when >500 mW dissipation required or legacy DO-41 footprint exists |
| BZX55C10 | Same 10 V, ±5%, but DO-35 with 400 mW rating and 25 Ω ZZ | Slightly higher impedance and lower power limit affect regulation accuracy under load | Choose where tighter thermal budget or lower-cost qualification is prioritized |
Compared with BZX79C10-T50A, the 1N4740A offers double the power rating in a larger DO-41 case, while the BZX55C10 trades 100 mW power and 5 Ω impedance for potential cost savings - both require validation of thermal performance and layout clearance in target applications.
Availability
BZX79C10-T50A is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, microcontroller reset circuits, and LED driver bias networks requiring stable component supply and long-lifecycle availability.
Supply support for BZX79C10-T50A 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 manufacturer specializing in energy-efficient power management, analog, and logic devices for automotive, industrial, and consumer markets.
The BZX79C series was designed for general-purpose voltage regulation and reference in cost-sensitive, high-reliability through-hole applications - emphasizing robustness, tight tolerance, and standardized DO-35 packaging.
FAQ
What is the exact zener voltage range for BZX79C10-T50A at 5 mA test current?
The BZX79C10-T50A has a guaranteed zener voltage range of 9.4 V minimum to 10.6 V maximum when measured at IZ = 5 mA and TL = 30°C ± 1°C. This ±5% tolerance reflects the full spread across production lots and is specified in the ON Semiconductor datasheet Rev. 3. The BZX79C10-T50A achieves this performance using a glass-passivated silicon junction optimized for stability and low noise.
Does BZX79C10-T50A have a positive or negative temperature coefficient, and what is its value?
The BZX79C10-T50A exhibits a positive temperature coefficient of +4.5 mV/°C, meaning its zener voltage increases linearly with rising junction temperature. This value is measured near the 10 V nominal point and is critical for predicting regulation drift in thermally unconstrained environments. The BZX79C10-T50A's TC is documented in the Electrical Characteristics table of the official ON Semiconductor datasheet.
What is the maximum leakage current specification for BZX79C10-T50A, and at what reverse voltage is it tested?
The BZX79C10-T50A specifies a maximum leakage current of 0.2 μA at a reverse voltage (VR) of 7.6 V, measured at TA = 25°C. This low leakage ensures minimal error current in high-impedance reference networks and supports accurate operation in battery-powered or low-quiescent-current applications. The BZX79C10-T50A maintains this spec across its qualified temperature range.
Can BZX79C10-T50A be used as a substitute for 1N4740A in existing designs?
The BZX79C10-T50A shares the same 10 V nominal zener voltage and ±5% tolerance as the 1N4740A, but differs in power rating (500 mW vs. 1000 mW) and package (DO-35 vs. DO-41). Substitution is feasible only if power dissipation remains below 500 mW and PCB footprint accommodates the smaller DO-35 case. The BZX79C10-T50A must be verified for thermal performance in the target layout before replacement.
What is the junction capacitance of BZX79C10-T50A, and how does it impact high-frequency performance?
The BZX79C10-T50A has a typical junction capacitance of 70 pF at 0 V reverse bias and 1 MHz frequency. This capacitance introduces phase shift and attenuation in high-frequency signal paths, limiting use in RF or fast transient suppression. For BZX79C10-T50A applications involving switching noise filtering, designers should model its capacitive reactance (XC ≈ 2.3 kΩ at 1 MHz) to ensure adequate impedance mismatch with source impedances.
BZX79C10-T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 10 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 200 nA @ 7 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
BZX79C10-T50A FAQ
1.How can I place an order for BZX79C10-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C10-T50A 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 BZX79C10-T50A reliable?
The price and inventory of BZX79C10-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C10-T50A is usually 5 days.
3.What payment methods are accepted for BZX79C10-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C10-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C10-T50A?
BZX79C10-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C10-T50A 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 BZX79C10-T50A?
For technical support, including BZX79C10-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C10-T50A requirements.
6.How does Aetrix verify that BZX79C10-T50A is sourced from the original manufacturer or authorized distributors?
All BZX79C10-T50A 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 BZX79C10-T50A meets industry standards.
7.What is the process for return or replacement of BZX79C10-T50A?
All BZX79C10-T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C10-T50A, 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 BZX79C10-T50A part is unused and in its original packaging.
Return procedure for BZX79C10-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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