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onsemi BZX79C13-T50A
- Part No.:
- BZX79C13-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C13-T50A.pdf
- Description:
- DIODE ZENER 13V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:8,935
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Product details
Overview
BZX79C13-T50A 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 stages. It delivers stable Zener voltage at 5 mA test current, exhibits 30 Ω dynamic impedance, and supports operation from −65°C to +200°C.
For engineers reviewing the BZX79C13-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include its 13.0 V nominal Zener voltage, ±5% tolerance, 30 Ω Zener impedance at 5 mA, 0.1 μA maximum leakage at 10.4 V, and DO-35 axial package with cathode band marking.
Technical Context
The BZX79C13-T50A operates as a two-terminal voltage reference device relying on controlled reverse-biased avalanche breakdown. Its Zener voltage is specified at IZ = 5 mA with thermal equilibrium at TL = 30°C and 3/8″ lead length, ensuring repeatable measurement conditions across production lots.
It features a temperature coefficient of +7 mV/°C (typical), indicating positive drift above 6 V, and a junction capacitance of 60 pF at VR = 0 V, f = 1 MHz - parameters critical for stability in precision biasing and noise-sensitive regulation paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12.4 V min / 14.1 V max at IZ = 5 mA - defines usable regulation window for 13 V nominal design |
| Tolerance | ±5% - enables predictable voltage margining without binning in cost-sensitive consumer and industrial designs |
| Zener Impedance (ZZ) | 30 Ω max at IZ = 5 mA - determines output voltage deviation under load transients |
| Leakage Current (IR) | 0.1 μA max at VR = 10.4 V - ensures minimal error current in high-impedance reference nodes |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous DC power handling in free-air mounting |
| Operating Temperature | −65°C to +200°C - supports deployment in automotive engine compartments and industrial control enclosures |
| Junction Capacitance (CJ) | 60 pF at VR = 0 V, f = 1 MHz - impacts high-frequency ripple rejection in switching regulator feedback networks |
Pinout & Package
Package: DO-35 glass axial package with cathode indicated by a single color band; leads are tinned and suitable for wave or hand soldering. Dimensions conform to JEDEC DO-35 standard (length ≈ 4.5 mm, diameter ≈ 1.8 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground node | Connected to circuit ground or lower-potential rail when used in shunt regulation configuration |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input voltage source through series resistor; provides stable 13 V reference to load |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage at 5 mA | Ensures consistent regulation point across manufacturing batches and temperature ranges |
| +7 mV/°C temperature coefficient | Compensates for typical silicon-based circuit drift, improving system-level thermal stability |
| DO-35 glass package | Provides hermetic sealing and long-term reliability in humid or chemically aggressive environments |
| 0.1 μA max leakage at 10.4 V | Minimizes loading error in high-impedance voltage divider or op-amp reference circuits |
| 500 mW power rating with 4.0 mW/°C derating | Enables predictable thermal management using standard PCB copper pour or lead-length heat sinking |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in linear regulators or flyback SMPS feedback loops. IC Role / Device Role / Timing Role: Shunt voltage reference providing error signal to optocoupler or error amplifier. Use Value: Maintains ±5% output accuracy over line/load/temperature with minimal external components. |
Use Scenario: Protecting microcontroller I/O pins from transient surges exceeding 13 V. IC Role / Device Role / Timing Role: Clamping element diverting excess energy to ground during ESD or inductive kick events. Use Value: Limits voltage to 14.1 V peak with sub-μA standby leakage, preserving signal integrity. |
| Voltage Reference | Current Source Bias |
Use Scenario: Generating stable bias for analog sensor conditioning circuits or ADC references. IC Role / Device Role / Timing Role: Precision DC reference node in ratiometric or compensated measurement systems. Use Value: Delivers 13 V ±0.65 V with <30 Ω dynamic impedance, reducing sensitivity to supply ripple. |
Use Scenario: Setting constant current in LED driver or transistor bias networks. IC Role / Device Role / Timing Role: Voltage-controlled current sink via series resistor and Zener-regulated base/gate drive. Use Value: Enables predictable 1–10 mA current setting with <1% variation across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | 12 V nominal, ±5%, 1 W power rating, DO-41 package | Higher power handling but larger footprint; requires layout revision | Select when >500 mW dissipation or higher surge immunity is required |
| BZX55C13 | 13 V nominal, ±5%, 500 mW, DO-35, but 45 Ω ZZ max vs. 30 Ω | Slightly higher impedance reduces regulation tightness under dynamic load | Acceptable where cost is prioritized over low-Z performance in non-critical references |
Compared with 1N4742A and BZX55C13, the BZX79C13-T50A offers tighter Zener impedance (30 Ω) in the compact DO-35 package, making it optimal for space-constrained, low-power regulation where voltage stability under varying current is essential.
Availability
BZX79C13-T50A is available at Aetrix Electronics and suitable for power supply feedback, overvoltage clamp, and voltage reference applications requiring stable component supply, long-lifecycle availability, and traceable sourcing for industrial and automotive electronics.
Supply support for BZX79C13-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, sensing, and connectivity solutions for automotive, industrial, and consumer markets.
The BZX79C13-T50A belongs to the BZX79C2V4–BZX79C56 family of general-purpose Zener diodes designed for cost-effective, reliable voltage regulation and reference functions in low-to-medium power analog systems.
FAQ
What is the Zener voltage tolerance of the BZX79C13-T50A?
The BZX79C13-T50A has a ±5% Zener voltage tolerance, meaning its rated 13 V nominal value falls between 12.4 V and 14.1 V when measured at IZ = 5 mA and TL = 30°C. This tolerance is guaranteed per ON Semiconductor's datasheet Rev. 3 and applies to all units shipped as BZX79C13-T50A. Designers should use the min/max bounds-not the nominal-for worst-case analysis in BZX79C13-T50A applications.
Does the BZX79C13-T50A have a specified forward voltage?
Yes, the BZX79C13-T50A specifies a maximum forward voltage (VF) of 1.5 V at IF = 100 mA, consistent with standard silicon diode behavior. While primarily used in reverse breakdown, this parameter matters when the device may experience forward conduction during startup, fault conditions, or AC-coupled signals. The BZX79C13-T50A's VF aligns with other DO-35 Zeners in the BZX79C series.
What is the thermal derating behavior of the BZX79C13-T50A?
The BZX79C13-T50A derates linearly at 4.0 mW/°C above a lead temperature (TL) of 75°C, down to zero power at 200°C. This means at TL = 100°C, its usable power drops to 400 mW (500 mW − [25 × 4.0]). This derating curve is defined in the Absolute Maximum Ratings table and must be applied in thermally constrained layouts where BZX79C13-T50A lead temperature exceeds 75°C.
Is the BZX79C13-T50A RoHS compliant?
Yes, the BZX79C13-T50A is RoHS compliant per ON Semiconductor's product change notices and packaging data. It contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE), and meets EU Directive 2011/65/EU requirements. Compliance documentation for BZX79C13-T50A is available through ON Semiconductor's quality portal and distributor certifications.
How is the cathode identified on the BZX79C13-T50A package?
The cathode of the BZX79C13-T50A is marked by a single color band on the DO-35 glass body, positioned adjacent to the cathode lead. This marking follows JEDEC standard polarity identification and is visible before and after soldering. When installed, the banded end connects to the higher-potential node (e.g., input rail or feedback point), while the unbanded end (anode) connects to ground or the reference return path in BZX79C13-T50A shunt regulator configurations.
BZX79C13-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):
- 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-T50A FAQ
1.How can I place an order for BZX79C13-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C13-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 BZX79C13-T50A reliable?
The price and inventory of BZX79C13-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C13-T50A is usually 5 days.
3.What payment methods are accepted for BZX79C13-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C13-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C13-T50A?
BZX79C13-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C13-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 BZX79C13-T50A?
For technical support, including BZX79C13-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C13-T50A requirements.
6.How does Aetrix verify that BZX79C13-T50A is sourced from the original manufacturer or authorized distributors?
All BZX79C13-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 BZX79C13-T50A meets industry standards.
7.What is the process for return or replacement of BZX79C13-T50A?
All BZX79C13-T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C13-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 BZX79C13-T50A part is unused and in its original packaging.
Return procedure for BZX79C13-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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