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onsemi BZX79C9V1_T50R
- Part No.:
- BZX79C9V1_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C9V1_T50R.pdf
- Description:
- DIODE ZENER 9.1V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:2,492
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Product details
Overview
BZX79C9V1_T50R from ON Semiconductor is a 9.1 V ±5% 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_T50R 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), maximum leakage, and DO-35 mechanical compatibility in space-constrained PCB layouts.
Technical Context
The BZX79C9V1_T50R operates as a silicon planar Zener diode optimized for stable voltage regulation in low-current (<20 mA) bias conditions. Its 9.1 V nominal breakdown voltage is specified at 5 mA test current, with a positive temperature coefficient of +3.8 mV/°C - indicating increasing VZ with rising junction temperature.
It exhibits 15 Ω dynamic impedance (ZZ) at IZ = 5 mA, 70 pF junction capacitance at 0 V, and 0.5 μA maximum reverse leakage (IR) at VR = 6 V. The device is rated for operation from –65°C to +200°C and derates linearly at 4.0 mW/°C above 75°C lead temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.5 V min / 9.6 V max at IZ = 5 mA - defines usable regulation window under standard test conditions |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous DC power handling on standard 3/8″ leads |
| Dynamic Impedance (ZZ) | 15 Ω max @ IZ = 5 mA - determines output voltage stability under small-signal load variations |
| Reverse Leakage (IR) | 0.5 μA max @ VR = 6 V - critical for low-power standby circuits where quiescent current must be minimized |
| Temp. Coefficient (TC) | +3.8 mV/°C - quantifies VZ drift per degree rise; enables thermal error budgeting in precision references |
| Junction Capacitance (CJ) | 70 pF @ VR = 0 V, f = 1 MHz - impacts high-frequency noise filtering and AC coupling performance |
| Operating Temp. Range | –65°C to +200°C - supports deployment in automotive under-hood, industrial, and aerospace environments |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device with no internal connections beyond anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side in reverse-bias regulation; carries full load current during clamping |
| Cathode | Zener breakdown terminal | Marked with color band; connected to higher potential side; defines regulated output node in shunt configuration |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-manufacturing trimming in cost-sensitive consumer and industrial designs |
| Low leakage (0.5 μA @ 6 V) | Minimizes standby power loss in battery-powered sensors and always-on monitoring circuits |
| Stable +3.8 mV/°C TC | Allows accurate thermal compensation in voltage references used across wide ambient temperature ranges |
| DO-35 glass package | Provides hermetic sealing and proven reliability for long-life applications in harsh environments |
| 500 mW power rating | Supports direct replacement of legacy 1N4739A in existing 9.1 V reference designs without thermal redesign |
Applications
| Automotive Cabin Sensors | Industrial PLC Input Protection |
|---|---|
Use Scenario: Voltage clamping on 12 V supply rails feeding cabin temperature/humidity sensor ICs. IC Role / Device Role / Timing Role: Shunt regulator providing stable 9.1 V reference and transient overvoltage suppression. Use Value: Prevents sensor IC damage from load-dump spikes while maintaining <1 μA quiescent current in sleep mode. | Use Scenario: Input stage protection for 24 V digital input modules in programmable logic controllers. IC Role / Device Role / Timing Role: Reverse-biased Zener clamping diode limiting input voltage to safe levels for optocoupler drivers. Use Value: Absorbs 500 mW surge energy without degradation, enabling compliance with IEC 61000-4-5 Level 3 surge immunity. |
| Medical Wearable Battery Monitoring | Consumer IoT Power Management |
Use Scenario: Reference voltage source for ADC measurement of Li-ion cell voltage in compact wearable health monitors. IC Role / Device Role / Timing Role: Precision Zener reference generating stable 9.1 V for ratiometric ADC scaling. Use Value: Delivers ±0.45 V regulation window (±5%) and +3.8 mV/°C TC, enabling sub-1% voltage measurement accuracy over 0–50°C. | Use Scenario: Overvoltage protection on USB-powered smart home hubs with mixed 3.3 V / 5 V / 9 V rail domains. IC Role / Device Role / Timing Role: Standby-mode clamp on auxiliary 9 V rail feeding isolated DC-DC converters. Use Value: Blocks >9.6 V transients with <0.5 μA leakage, preserving system sleep current below 5 μA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | Same 9.1 V nominal, ±5% tolerance, DO-41 package (larger than DO-35); 10 Ω ZZ vs. 15 Ω | Higher power (1 W) but requires larger PCB footprint; not suitable for ultra-compact layouts | Select when higher surge power handling is required and board space permits DO-41 |
| MMSZ4687 | SOD-123 surface-mount package; same 9.1 V, ±5%, but only 500 mW derated to 300 mW at 25°C ambient | No axial leads - eliminates manual through-hole insertion; better for automated assembly | Select for reflow-compatible designs where DO-35 hand-soldering is impractical |
Compared with 1N4739A and MMSZ4687, the BZX79C9V1_T50R offers optimal balance of DO-35 mechanical robustness, 500 mW power capability, and tight thermal coefficient for analog reference use - making it preferred for repair, prototyping, and legacy through-hole systems where lead-forming and axial mounting are retained.
Availability
BZX79C9V1_T50R is available at Aetrix Electronics and suitable for automotive cabin sensors, industrial PLC input protection, and medical wearable battery monitoring requiring stable component supply and long-term obsolescence management.
Supply support for BZX79C9V1_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 manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX79C9V1_T50R belongs to the BZX79C series of general-purpose Zener diodes designed for reliable voltage regulation and transient suppression in cost-sensitive, high-volume applications across industrial control and consumer electronics.
FAQ
What is the exact Zener voltage range for BZX79C9V1_T50R at 5 mA test current?
The BZX79C9V1_T50R has a guaranteed Zener voltage range of 8.5 V minimum to 9.6 V maximum when measured at IZ = 5 mA and TL = 30°C ± 1°C with 3/8″ lead length. This ±5% tolerance is confirmed in the ON Semiconductor datasheet revision 3 (November 2017) and applies strictly to the BZX79C9V1_T50R variant within the BZX79C2V4–BZX79C56 family.
Does BZX79C9V1_T50R have a specified forward voltage?
Yes - the BZX79C9V1_T50R has a maximum forward voltage (VF) of 1.5 V at IF = 100 mA, as stated in the "Electrical Characteristics" section of the official ON Semiconductor datasheet. This parameter is consistent across the entire BZX79C2V4–BZX79C56 series and reflects the diode's silicon PN junction behavior in forward conduction.
What is the junction capacitance of BZX79C9V1_T50R and at what condition is it measured?
The junction capacitance of BZX79C9V1_T50R is 70 pF, measured at VR = 0 V and f = 1 MHz. This value is explicitly listed in the "Electrical Characteristics" table for the BZX79C9V1 row under the C (pF) column and is critical for high-frequency decoupling and noise filtering applications where parasitic capacitance affects signal integrity.
Can BZX79C9V1_T50R be used in place of 1N4739A without circuit modification?
The BZX79C9V1_T50R shares identical electrical specifications (9.1 V ±5%, 500 mW, 15 Ω ZZ) with 1N4739A but uses a smaller DO-35 package versus DO-41. While electrically compatible, mechanical substitution requires verification of PCB pad spacing and thermal relief - the BZX79C9V1_T50R cannot be considered a drop-in replacement without layout review due to differing package dimensions and lead geometry.
What is the maximum reverse leakage current for BZX79C9V1_T50R and at what voltage is it specified?
The maximum reverse leakage current for BZX79C9V1_T50R is 0.5 μA, specified at VR = 6 V and TA = 25°C. This value is documented in the "Electrical Characteristics" table under the IR (μA) column for the BZX79C9V1 row and is essential for low-power design validation where standby current must remain below 1 μA.
BZX79C9V1_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):
- 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_T50R FAQ
1.How can I place an order for BZX79C9V1_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C9V1_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 BZX79C9V1_T50R reliable?
The price and inventory of BZX79C9V1_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C9V1_T50R is usually 5 days.
3.What payment methods are accepted for BZX79C9V1_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C9V1_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C9V1_T50R?
BZX79C9V1_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C9V1_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 BZX79C9V1_T50R?
For technical support, including BZX79C9V1_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C9V1_T50R requirements.
6.How does Aetrix verify that BZX79C9V1_T50R is sourced from the original manufacturer or authorized distributors?
All BZX79C9V1_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 BZX79C9V1_T50R meets industry standards.
7.What is the process for return or replacement of BZX79C9V1_T50R?
All BZX79C9V1_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C9V1_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 BZX79C9V1_T50R part is unused and in its original packaging.
Return procedure for BZX79C9V1_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79C9V1_T50R Tags
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