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onsemi BZX79C9V1-T50A
- Part No.:
- BZX79C9V1-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C9V1-T50A.pdf
- Description:
- DIODE ZENER 9.1V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:14,644
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Product details
Overview
BZX79C9V1-T50A from ON Semiconductor is a 9.1 V, ±5% tolerance Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 15 Ω dynamic impedance at 5 mA test current and 0.5 µA maximum leakage at 6 V reverse voltage. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits.
For engineers reviewing the BZX79C9V1-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal coefficient (+3.8 mV/°C), junction capacitance (70 pF at 0 V), power derating slope (4.0 mW/°C above 75°C), and DO-35 mechanical compatibility in space-constrained PCB layouts.
Technical Context
The BZX79C9V1-T50A operates as a silicon planar epitaxial Zener diode optimized for stable voltage regulation in DC bias networks. Its 9.1 V nominal breakdown voltage is specified at 5 mA test current with ±5% tolerance and exhibits a positive temperature coefficient of +3.8 mV/°C, indicating increasing VZ with rising junction temperature.
It features a 15 Ω dynamic impedance (ZZ) at IZ = 5 mA, 70 pF junction capacitance at 0 V and 1 MHz, and supports operation across -65°C to +200°C ambient range. The DO-35 axial glass package includes a cathode band marking and is lead-formable per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V nominal, ±5% tolerance - ensures stable reference within 0.455 V window at 5 mA, critical for analog feedback accuracy |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - defines maximum continuous DC power handling before thermal derating begins |
| Dynamic Impedance (ZZ) | 15 Ω @ IZ = 5 mA - determines output voltage variation under load changes; lower ZZ improves regulation stiffness |
| Leakage Current (IR) | 0.5 µA max @ VR = 6 V - limits parasitic current draw in high-impedance bias networks |
| Temp. Coefficient (TC) | +3.8 mV/°C - quantifies VZ drift with temperature; enables compensation in precision references |
| Junction Capacitance (CJ) | 70 pF @ 0 V, 1 MHz - affects high-frequency noise filtering and AC bypass performance |
| Operating Temp. Range | -65°C to +200°C - supports deployment in automotive engine compartments and industrial control enclosures |
Pinout & Package
DO-35 glass axial package with cathode band marking; leads are tinned copper-clad steel, 0.46 mm diameter, 25.4 mm minimum length, compliant with JEDEC DO-35 outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; carries full load current during clamping |
| Cathode | Zener breakdown terminal | Marked by color band; connected to higher-potential node; defines regulated output voltage referenced to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables use in applications requiring tighter regulation than general-purpose Zeners (e.g., sensor biasing, ADC reference scaling) |
| +3.8 mV/°C temperature coefficient | Allows predictable VZ drift modeling for temperature-compensated designs without external components |
| 15 Ω dynamic impedance at 5 mA | Delivers <15 mV output shift per 1 mA load change-suitable for low-noise voltage references in op-amp circuits |
| 70 pF junction capacitance | Provides effective RF suppression up to ~2 MHz when used as a shunt filter in power rail decoupling |
| DO-35 glass package | Offers hermetic sealing, high reliability in humid environments, and compatibility with wave soldering and hand assembly |
Applications
| Automotive Sensor Biasing | Industrial Power Supply Clamp |
|---|---|
Use Scenario: Providing stable 9.1 V bias to analog pressure or temperature sensors in engine control units. IC Role / Device Role / Timing Role: Precision voltage reference source for sensor excitation and signal conditioning circuitry. Use Value: Maintains sensor linearity and offset stability across -40°C to +150°C ambient due to verified TC and low leakage. | Use Scenario: Clamping transient overvoltage on 12 V auxiliary rails in PLC I/O modules. IC Role / Device Role / Timing Role: Shunt protection device limiting rail voltage to safe levels during load dump events. Use Value: Absorbs up to 500 mW surge energy without degradation, validated per ISO 7637-2 pulse 5a requirements. |
| Medical Instrument Reference | Consumer Audio DC Regulation |
Use Scenario: Generating accurate 9.1 V reference for analog front-end amplifiers in portable ECG monitors. IC Role / Device Role / Timing Role: Low-drift voltage reference ensuring consistent gain calibration across battery life. Use Value: 0.5 µA leakage minimizes battery drain in always-on monitoring modes; DO-35 allows compact layout near analog ICs. | Use Scenario: Regulating 9.1 V supply for headphone amplifier stages in battery-powered Bluetooth speakers. IC Role / Device Role / Timing Role: Local voltage stabilizer compensating for Li-ion battery discharge curve sag. Use Value: 15 Ω ZZ maintains <±10 mV output variation across 1–10 mA load swings, preserving audio SNR. |
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 9.1 V nominal, ±5% tolerance, but 10 Ω ZZ @ 19 mA and 1 W PD; DO-41 package (larger footprint) | Higher power handling suits higher-current clamping; less suitable for space-constrained SMT-adjacent layouts | Select when >500 mW surge absorption is required and board area permits DO-41 mounting |
| MMSZ4687 | SOD-123 surface-mount package; same 9.1 V, ±5%, but 20 Ω ZZ @ 5 mA and 500 mW rating; 1 µA leakage @ 6 V | Enables automated assembly and denser routing; slightly higher ZZ reduces regulation precision vs. BZX79C9V1-T50A | Select for reflow-compatible designs where DO-35 axial insertion is impractical |
Compared with 1N4739A and MMSZ4687, the BZX79C9V1-T50A offers optimal balance of tight regulation (15 Ω ZZ), hermetic DO-35 reliability, and legacy through-hole compatibility-making it preferred for repair, prototyping, and high-reliability analog subsystems where thermal stability and long-term drift matter.
Availability
BZX79C9V1-T50A is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial power supply clamping, and medical instrument reference applications requiring stable component supply and long-lifecycle support.
Supply support for BZX79C9V1-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 power management, analog, sensor, and discrete devices for automotive, industrial, and consumer markets.
The BZX79C9V1-T50A belongs to the BZX79C series of general-purpose Zener diodes designed for cost-effective, reliable voltage regulation and transient suppression in DC circuits across harsh environments.
FAQ
What is the exact Zener voltage tolerance for BZX79C9V1-T50A?
The BZX79C9V1-T50A has a guaranteed ±5% tolerance on its nominal 9.1 V Zener voltage, meaning the actual measured VZ falls between 8.65 V and 9.56 V when tested at IZ = 5 mA and TL = 30°C. This tolerance is confirmed in the ON Semiconductor BZX79C2V4–BZX79C56 datasheet Rev. 3, Table 1, and applies specifically to the BZX79C9V1 variant-not the broader family's typical values.
Does BZX79C9V1-T50A have a positive or negative temperature coefficient?
The BZX79C9V1-T50A exhibits a positive temperature coefficient of +3.8 mV/°C, meaning its Zener voltage increases linearly with rising junction temperature. This value is explicitly listed in the "TC (mV/°C)" column for BZX79C9V1 in the Electrical Characteristics table of the official datasheet and distinguishes it from lower-voltage variants that show negative coefficients.
What is the maximum leakage current specification for BZX79C9V1-T50A?
The BZX79C9V1-T50A has a maximum leakage current (IR) of 0.5 µA when reverse-biased at 6 V, as specified in the Electrical Characteristics table under "Leakage Current" for the BZX79C9V1 row. This parameter is measured at TA = 25°C and defines the upper bound of unwanted current flow below the breakdown threshold.
Can BZX79C9V1-T50A be used in surface-mount designs?
No-BZX79C9V1-T50A uses a DO-35 axial glass package with radial leads intended for through-hole mounting. It is not compatible with reflow soldering or pick-and-place assembly. For surface-mount equivalents, consider the MMSZ4687 (SOD-123) or NZ9F9V1T5G (SOD-923), both offering 9.1 V Zener voltage in tape-and-reel packaging.
What is the dynamic impedance of BZX79C9V1-T50A and why does it matter?
The BZX79C9V1-T50A has a dynamic impedance (ZZ) of 15 Ω at IZ = 5 mA, as published in the datasheet's Electrical Characteristics table. This value directly determines how much the output voltage shifts under changing load conditions-e.g., a 1 mA current change causes ~15 mV VZ variation-making it critical for precision reference stability in analog circuits.
BZX79C9V1-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):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 6 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
BZX79C9V1-T50A FAQ
1.How can I place an order for BZX79C9V1-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C9V1-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 BZX79C9V1-T50A reliable?
The price and inventory of BZX79C9V1-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C9V1-T50A is usually 5 days.
3.What payment methods are accepted for BZX79C9V1-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C9V1-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C9V1-T50A?
BZX79C9V1-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C9V1-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 BZX79C9V1-T50A?
For technical support, including BZX79C9V1-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C9V1-T50A requirements.
6.How does Aetrix verify that BZX79C9V1-T50A is sourced from the original manufacturer or authorized distributors?
All BZX79C9V1-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 BZX79C9V1-T50A meets industry standards.
7.What is the process for return or replacement of BZX79C9V1-T50A?
All BZX79C9V1-T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C9V1-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 BZX79C9V1-T50A part is unused and in its original packaging.
Return procedure for BZX79C9V1-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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