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onsemi BZX79C13_T50R
- Part No.:
- BZX79C13_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C13_T50R.pdf
- Description:
- DIODE ZENER 13V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:5,702
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Product details
Overview
BZX79C13_T50R from ON Semiconductor is a 13 V, 5% tolerance, 500 mW DO-35 glass-case Zener diode optimized for voltage regulation and reference applications in low-power analog circuits, power supply feedback loops, and overvoltage protection circuits.
For engineers reviewing the BZX79C13_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy (12.4–14.1 V), dynamic impedance (8 Ω at 5 mA), leakage current (0.1 μA at 10.5 V), and thermal coefficient (+7 mV/°C) - all critical for stable reference design under varying temperature and load conditions.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable reference voltage across its terminals. It is characterized at 5 mA test current with a nominal zener voltage of 13 V and ±5% tolerance, ensuring predictable clamping behavior in precision biasing and regulation paths.
The device features a low dynamic impedance of 8 Ω at IZ = 5 mA, enabling tight voltage regulation under small-signal variations, and exhibits a positive temperature coefficient of +7 mV/°C - supporting predictable drift compensation in temperature-sensitive references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13 V nominal, 12.4–14.1 V range at 5 mA - defines precise clamping threshold for regulation and protection |
| Power Dissipation (PD) | 500 mW at TL ≤ 75°C - sets maximum continuous power handling in leaded through-hole layout |
| Dynamic Impedance (ZZ) | 8 Ω max at IZ = 5 mA - ensures minimal output voltage variation under load transients |
| Leakage Current (IR) | 0.1 μA max at VR = 10.5 V - guarantees negligible error current in high-impedance reference nodes |
| Temperature Coefficient (TC) | +7 mV/°C - enables predictable voltage drift modeling for thermal compensation design |
| Junction Temperature Range | −65°C to +200°C - supports operation in harsh industrial and automotive under-hood environments |
| Capacitance (C) | 60 pF at VR = 0 V, f = 1 MHz - impacts high-frequency noise filtering and AC response in shunt regulator paths |
Pinout & Package
DO-35 glass axial package with cathode indicated by a color band on the body. Leads are tinned copper alloy, 3/8″ length specified for thermal derating compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node in shunt regulation configuration |
| Cathode | Reverse-biased breakdown terminal / regulated output node | Connected to input voltage source via series resistor; delivers stable 13 V reference to load |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables direct use in cost-sensitive designs without post-production trimming or calibration |
| Low dynamic impedance (8 Ω) | Minimizes output voltage deviation under ±1 mA load current changes in feedback networks |
| Stable +7 mV/°C TC | Allows accurate prediction and compensation of reference drift over −40°C to +125°C ambient |
| DO-35 glass package | Provides hermetic sealing and long-term parameter stability in humid or corrosive environments |
| 100% surge tested | Guarantees reliability against repetitive transient overvoltage events in power supply inputs |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Used in the optocoupler feedback path of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Provides precise 13 V reference for TL431-type shunt regulators or comparator thresholds. Use Value: Maintains ±1% output regulation across line/load/temperature due to tight VZ tolerance and low ZZ. | Use Scenario: Placed across sensitive IC inputs to limit transient spikes from ESD or inductive switching. IC Role / Device Role / Timing Role: Acts as a passive voltage clamp, conducting only when input exceeds 14.1 V. Use Value: Limits peak voltage to safe levels while drawing <0.1 μA standby current below 10.5 V. |
| Temperature-Compensated Bias Network | Low-Power Analog Reference Source |
Use Scenario: Paired with NTC thermistor in sensor front-end biasing to offset thermal drift. IC Role / Device Role / Timing Role: Supplies stable reference voltage whose +7 mV/°C TC counterbalances negative TC components. Use Value: Enables <±0.5% total drift over −25°C to +85°C without active compensation circuitry. | Use Scenario: Powers low-current analog sensors (e.g., RTD interfaces, precision ADC references). IC Role / Device Role / Timing Role: Delivers clean, low-noise 13 V reference with 60 pF capacitance aiding HF filtering. Use Value: Supports 16-bit ADC accuracy by limiting reference voltage ripple to <100 μV RMS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4743A | Same 13 V nominal, but ±5% tolerance and 1 Ω higher ZZ (9 Ω); DO-41 package, larger footprint | Higher power rating (1 W) suits higher-current regulation; less suitable for space-constrained DO-35 layouts | Select when >500 mW dissipation or PCB real estate allows DO-41 |
| BZX55C13 | Same 13 V, ±5%, DO-35, but higher ZZ (10 Ω) and higher leakage (0.5 μA at 10.5 V) | Lower performance in precision references; acceptable for non-critical clamping where cost is primary | Select for legacy compatibility or cost-driven designs where 0.5 μA leakage is tolerable |
Compared with BZX79C13_T50R, 1N4743A offers higher power margin but requires board rework for DO-41; BZX55C13 matches form factor but sacrifices regulation accuracy and leakage performance - making BZX79C13_T50R optimal for space-constrained, precision 13 V reference needs.
Availability
BZX79C13_T50R is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, temperature-compensated biasing, and low-power analog reference applications requiring stable component supply and long-lifecycle support.
Supply support for BZX79C13_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, analog, sensor, and logic solutions for automotive, industrial, and consumer markets.
The BZX79C series is part of ON Semiconductor's general-purpose Zener diode portfolio, designed specifically for reliable voltage regulation and reference functions in cost-sensitive, high-volume analog and power management circuits.
FAQ
What is the exact zener voltage range for BZX79C13_T50R at 5 mA?
The BZX79C13_T50R has a guaranteed zener voltage range of 12.4 V to 14.1 V at IZ = 5 mA and TA = 25°C, per its ±5% tolerance specification. This range is validated during production testing and applies directly to the BZX79C13_T50R device marking and packaging. The 13 V nominal value is the center point of this range, and actual units fall within these bounds without binning or sorting.
Does BZX79C13_T50R have a defined forward voltage specification?
Yes, the BZX79C13_T50R specifies a maximum forward voltage (VF) of 1.5 V at IF = 100 mA, consistent with standard silicon diode behavior. This parameter is relevant when the device is used in forward conduction mode - for example, in polarity protection or dual-function clamp circuits - and ensures predictable drop characteristics during fault conditions or bidirectional signal limiting.
What is the thermal derating behavior of BZX79C13_T50R above 75°C?
The BZX79C13_T50R derates linearly at 4.0 mW/°C above a lead temperature of 75°C, based on 3/8″ lead length. At 100°C lead temperature, its usable power dissipation drops to 400 mW (500 mW − [25°C × 4.0 mW/°C]). This derating curve is defined in the Absolute Maximum Ratings table and must be applied in thermal design to prevent junction overheating and parametric shift.
Is BZX79C13_T50R suitable for use in automotive under-hood applications?
Yes, the BZX79C13_T50R supports an operating junction temperature range of −65°C to +200°C and is qualified for industrial-grade reliability. Its DO-35 glass package provides hermetic sealing and resistance to thermal cycling and humidity - making it suitable for non-safety-critical automotive under-hood applications such as engine control module voltage monitoring and sensor biasing, provided system-level qualification is completed.
How does the +7 mV/°C temperature coefficient affect BZX79C13_T50R in precision reference designs?
The +7 mV/°C temperature coefficient means BZX79C13_T50R's zener voltage increases by approximately 7 mV per degree Celsius rise in junction temperature. In precision reference designs, this predictable drift enables first-order thermal compensation - for example, by pairing with a negative-TC component like a silicon diode or thermistor - to achieve net drift <±10 ppm/°C over limited temperature spans.
BZX79C13_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):
- 13 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8 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
BZX79C13_T50R FAQ
1.How can I place an order for BZX79C13_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C13_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 BZX79C13_T50R reliable?
The price and inventory of BZX79C13_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C13_T50R is usually 5 days.
3.What payment methods are accepted for BZX79C13_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C13_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C13_T50R?
BZX79C13_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C13_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 BZX79C13_T50R?
For technical support, including BZX79C13_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C13_T50R requirements.
6.How does Aetrix verify that BZX79C13_T50R is sourced from the original manufacturer or authorized distributors?
All BZX79C13_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 BZX79C13_T50R meets industry standards.
7.What is the process for return or replacement of BZX79C13_T50R?
All BZX79C13_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C13_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 BZX79C13_T50R part is unused and in its original packaging.
Return procedure for BZX79C13_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79C13_T50R Tags
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