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onsemi BZX79C47_T50R
- Part No.:
- BZX79C47_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C47_T50R.pdf
- Description:
- DIODE ZENER 47V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,679
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Product details
Overview
BZX79C47_T50R from ON Semiconductor is a 47 V ±5% tolerance Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 170 Ω dynamic impedance at 2 mA test current and 0.05 μA leakage current at 32.9 V reverse voltage. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits.
For engineers reviewing the BZX79C47_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, junction capacitance (19 pF at 0 V), dynamic impedance stability, and DO-35 mechanical compatibility in space-constrained PCB layouts.
Technical Context
The BZX79C47_T50R operates as a silicon planar Zener diode with sharp reverse breakdown at 47 V nominal, designed for stable voltage regulation under DC or low-frequency transient conditions. Its 5% voltage tolerance and −2.0 mV/°C temperature coefficient ensure predictable drift across −65°C to +200°C operating range.
It exhibits 170 Ω dynamic impedance (ZZ) measured at IZ = 2 mA, 0.05 μA maximum leakage (IR) at VR = 32.9 V, and 19 pF junction capacitance at zero bias and 1 MHz - parameters critical for noise-sensitive reference and filtering applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 44 V min / 50 V max at IZ = 2 mA - defines usable regulation window for 47 V nominal reference |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power before thermal derating begins |
| Dynamic Impedance (ZZ) | 170 Ω @ IZ = 2 mA - determines output voltage variation under load current changes |
| Leakage Current (IR) | 0.05 μA max @ VR = 32.9 V - ensures minimal error current in high-impedance bias networks |
| Junction Capacitance (C) | 19 pF @ VZ = 0 V, f = 1 MHz - impacts high-frequency noise rejection and AC coupling behavior |
| Temp. Coefficient (TC) | −2.0 mV/°C - quantifies voltage drift per degree Celsius near nominal operating point |
| Operating Temp. Range | −65°C to +200°C - supports deployment in automotive under-hood and industrial harsh environments |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no external biasing circuitry beyond series current-limiting resistor.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground node | Connected to lower potential side in reverse-biased regulation configuration |
| Cathode | Zener breakdown terminal / voltage reference output node | Marked with color band; delivers regulated 47 V when reverse biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables consistent reference accuracy without post-manufacturing trimming in cost-sensitive designs |
| DO-35 glass package | Provides hermetic sealing and thermal stability for long-term reliability in elevated ambient temperatures |
| 170 Ω dynamic impedance | Maintains <1% output voltage deviation across typical load current variations in feedback networks |
| −2.0 mV/°C tempco | Allows predictable compensation in temperature-critical voltage references without active circuitry |
| 0.05 μA leakage at 32.9 V | Minimizes loading error in high-resistance divider chains used for microcontroller ADC references |
Applications
| Industrial Sensor Signal Conditioning | Automotive ECU Reference Voltage |
|---|---|
Use Scenario: Stabilizing excitation voltage for resistive bridge sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Zener diode providing fixed 47 V reference for op-amp biasing and ADC reference scaling. Use Value: Maintains ±0.5% reference stability over −40°C to +85°C due to known tempco and low leakage. | Use Scenario: Clamping transient spikes on 48 V battery rail monitoring circuits in engine control units. IC Role / Device Role / Timing Role: Overvoltage protection element shunting surge energy above 50 V threshold. Use Value: Responds within nanoseconds to transients while surviving repeated 500 mW pulse loads per JEDEC standards. |
| Medical Instrument Power Sequencing | Telecom Line Interface Protection |
Use Scenario: Generating precise enable thresholds for multi-rail power supply sequencing in portable diagnostic devices. IC Role / Device Role / Timing Role: Voltage threshold detector triggering supervisor IC reset signals at 47 V ±5%. Use Value: Eliminates need for external comparator by leveraging sharp Zener knee and tight tolerance. | Use Scenario: Protecting RS-485 transceiver inputs against induced surges on outdoor telecom lines. IC Role / Device Role / Timing Role: Primary clamping device limiting line voltage to safe levels during lightning-induced transients. Use Value: Handles repetitive 100 A surge currents (8/20 μs) when paired with appropriate series impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4753A | Same 47 V nominal rating but ±5% tolerance, 1 W power rating, DO-41 package | Higher power handling enables use in higher-current regulation; larger footprint requires layout change | Select when >500 mW continuous dissipation is required and board space permits DO-41 |
| BZX84-C47 | 47 V ±5%, SOT-23 package, 300 mW rating, 190 Ω ZZ @ 5 mA | Surface-mount format suits automated assembly; lower power rating limits current capability | Select for space-constrained PCBs where reflow compatibility and smaller size outweigh power needs |
Compared with 1N4753A and BZX84-C47, the BZX79C47_T50R offers optimal balance of DO-35 mechanical robustness, 500 mW thermal performance, and proven reliability in through-hole industrial assemblies - making it preferred for legacy-compatible, medium-power analog reference designs.
Availability
BZX79C47_T50R is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive ECU reference voltage generation, and medical instrument power sequencing requiring stable component supply and long-lifecycle support.
Supply support for BZX79C47_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 power management, analog, sensor, and logic devices for automotive, industrial, and consumer markets.
The BZX79C series was developed for general-purpose voltage regulation and reference applications, emphasizing tight tolerance, stable tempco, and rugged DO-35 packaging for reliability in demanding environments.
FAQ
What is the Zener voltage tolerance of the BZX79C47_T50R?
The BZX79C47_T50R has a Zener voltage tolerance of ±5%, meaning its breakdown voltage falls between 44 V and 50 V when tested at 2 mA. This tolerance is specified at TA = 25°C and applies across the full operating temperature range. The BZX79C47_T50R achieves this consistency via tightly controlled diffusion processes in ON Semiconductor's silicon fabrication line.
What is the maximum power dissipation for the BZX79C47_T50R?
The BZX79C47_T50R is rated for 500 mW maximum power dissipation at lead temperature (TL) ≤ 75°C with 3/8″ lead length. Above 75°C, it derates linearly at 4.0 mW/°C. This rating reflects thermal limits of the DO-35 glass package and must be applied with appropriate PCB copper area and airflow considerations. The BZX79C47_T50R remains functional up to +200°C junction temperature.
Does the BZX79C47_T50R have a specified junction capacitance?
Yes, the BZX79C47_T50R has a junction capacitance of 19 pF measured at zero bias and 1 MHz frequency. This value is critical for high-frequency noise filtering and AC coupling applications where parasitic capacitance affects signal integrity. The BZX79C47_T50R's capacitance remains stable across its operating voltage range and contributes to predictable transient response in clamping circuits.
What is the leakage current specification for the BZX79C47_T50R?
The BZX79C47_T50R specifies a maximum leakage current (IR) of 0.05 μA at VR = 32.9 V, measured at TA = 25°C. This ultra-low leakage ensures minimal error in high-impedance reference networks and preserves accuracy in battery-powered systems. The BZX79C47_T50R maintains this performance across its full −65°C to +200°C storage and operating temperature range.
How is the cathode identified on the BZX79C47_T50R package?
The cathode of the BZX79C47_T50R is marked by a distinct color band on the DO-35 glass body, consistent with industry-standard polarity marking. This band aligns with the second-line marking "9C" and third-line "47" in the top-marking scheme. The BZX79C47_T50R follows ON Semiconductor's standardized marking protocol, ensuring unambiguous identification during manual or automated assembly.
BZX79C47_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):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 170 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.9 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
BZX79C47_T50R FAQ
1.How can I place an order for BZX79C47_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C47_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 BZX79C47_T50R reliable?
The price and inventory of BZX79C47_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C47_T50R is usually 5 days.
3.What payment methods are accepted for BZX79C47_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C47_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C47_T50R?
BZX79C47_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C47_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 BZX79C47_T50R?
For technical support, including BZX79C47_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C47_T50R requirements.
6.How does Aetrix verify that BZX79C47_T50R is sourced from the original manufacturer or authorized distributors?
All BZX79C47_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 BZX79C47_T50R meets industry standards.
7.What is the process for return or replacement of BZX79C47_T50R?
All BZX79C47_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C47_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 BZX79C47_T50R part is unused and in its original packaging.
Return procedure for BZX79C47_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79C47_T50R Tags
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