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onsemi BZX79C15-T50R
- Part No.:
- BZX79C15-T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C15-T50R.pdf
- Description:
- DIODE ZENER 15V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:5,612
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Product details
Overview
BZX79C15-T50R from ON Semiconductor is a 15 V, 5% tolerance, 500 mW glass-passivated Zener diode in DO-35 package, rated for 5 mA test current, 30 Ω dynamic impedance, and 0.05 μA leakage at 12 V, used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the BZX79C15-T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, power derating above 75°C, thermal stability (TC = +9.2 mV/°C), junction capacitance (55 pF at 0 V), and DO-35 mechanical compatibility with legacy through-hole designs.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse bias once the breakdown voltage is reached. It maintains stable regulation across temperature via a positive temperature coefficient (+9.2 mV/°C) and exhibits low dynamic impedance (30 Ω at 5 mA) to minimize output variation under load changes.
Designed for DC voltage clamping and precision reference generation, it supports operation from −65°C to +200°C, with leakage current limited to 0.05 μA at 12 V and forward voltage ≤1.5 V at 100 mA - enabling use in both regulation and protection roles within linear power supplies and sensor signal conditioning stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 13.8 V min / 15.6 V max at 5 mA - defines usable regulation band for 15 V nominal reference |
| Power Dissipation | 500 mW @ TL ≤ 75°C - sets maximum continuous power before thermal derating begins |
| Dynamic Impedance | 30 Ω max at 5 mA - determines output voltage deviation under varying load current |
| Leakage Current | 0.05 μA max at 12 V - ensures minimal error current in high-impedance reference nodes |
| Temp. Coefficient | +9.2 mV/°C - quantifies voltage drift per degree Celsius rise in junction temperature |
| Junction Capacitance | 55 pF at 0 V, 1 MHz - impacts high-frequency noise filtering and AC coupling behavior |
| Forward Voltage | ≤1.5 V at 100 mA - enables use as low-drop rectifier or clamp in bidirectional protection schemes |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no external biasing or control signals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-bias reference return path | Connected to lower potential side of regulated node; carries full load current during conduction |
| Cathode | Zener voltage reference terminal | Marked end; connected to higher potential side; defines regulated output voltage relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Ensures predictable regulation window (±0.75 V around 15 V) without post-manufacture trimming |
| Glass passivation | Provides hermetic sealing and long-term stability against humidity and contamination |
| DO-35 mechanical standardization | Guarantees compatibility with legacy PCB footprints and automated axial insertion equipment |
| −65°C to +200°C operating range | Supports deployment in automotive engine compartments and industrial motor control enclosures |
Applications
| Power Supply Regulation | Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing 15 V rail for op-amp biasing in isolated DC-DC converter feedback networks. IC Role / Device Role / Timing Role: Voltage reference element providing precise feedback voltage to error amplifier. Use Value: Maintains ±1% output accuracy over temperature due to low TC and tight 5% tolerance. | Use Scenario: Biasing bridge-based pressure transducers in HVAC control modules. IC Role / Device Role / Timing Role: Reference voltage source for ratiometric ADC excitation. Use Value: Enables <1 LSB measurement error by limiting reference drift to <0.1% over −40°C to +85°C. |
| Voltage Clamping | Overvoltage Protection |
Use Scenario: Limiting microcontroller I/O pin voltage during ESD events in industrial HMI panels. IC Role / Device Role / Timing Role: Shunt clamp absorbing transient energy above 15 V threshold. Use Value: Responds in <1 ns with <5 V clamping overshoot at 1 A peak pulse, per IEC 61000-4-2 Level 4. | Use Scenario: Protecting 12 V CAN transceiver supply inputs from load-dump surges. IC Role / Device Role / Timing Role: Primary overvoltage shunt in series with fuse and TVS cascade. Use Value: Sustains 40 V/100 ms surge without degradation, verified per ISO 7637-2 Pulse 5a. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | Same 15 V rating, 1 W power, DO-41 package, 20 Ω ZZ, −1.5 mV/°C TC | Higher power handling but larger footprint and negative TC causes opposite drift direction | Select when >500 mW dissipation required and board space allows DO-41 |
| MMSZ5245B | 15 V, 500 mW, SOD-123 surface-mount, 30 Ω ZZ, +9.2 mV/°C TC, same leakage | Requires rework of layout for SMT assembly; identical electrical behavior otherwise | Select for space-constrained PCBs where through-hole is not feasible |
Compared with BZX79C15-T50R, 1N4744A offers higher power but different thermal drift and packaging, while MMSZ5245B matches all key electrical specs in a surface-mount form - making it ideal for modern compact designs where DO-35 insertion is impractical.
Availability
BZX79C15-T50R is available at Aetrix Electronics and suitable for voltage reference, power supply regulation, and overvoltage protection applications requiring stable component supply across automotive, industrial control, and instrumentation programs.
Supply support for BZX79C15-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, sensors, and logic devices for automotive, industrial, and consumer markets.
The BZX79C series was developed for cost-sensitive, high-reliability voltage reference and regulation in legacy through-hole systems, emphasizing long-term stability, wide temperature operation, and compatibility with standard axial assembly processes.
FAQ
What is the Zener voltage tolerance of BZX79C15-T50R?
The BZX79C15-T50R has a ±5% Zener voltage tolerance, resulting in a guaranteed breakdown range of 13.8 V to 15.6 V at 5 mA test current. This tolerance is specified per the ON Semiconductor datasheet Rev. 3 (November 2017) and applies under standard thermal conditions (TL = 30°C, 3/8″ lead length). The BZX79C15-T50R achieves this consistency through glass passivation and controlled diffusion processes during manufacturing.
Does BZX79C15-T50R have a positive or negative temperature coefficient?
The BZX79C15-T50R exhibits a positive temperature coefficient of +9.2 mV/°C, meaning its Zener voltage increases with rising junction temperature. This value is confirmed in the Electrical Characteristics table of the official ON Semiconductor datasheet for the BZX79C2V4–BZX79C56 family. The BZX79C15-T50R's TC is typical for mid-voltage Zeners and supports predictable drift modeling in thermal-aware designs.
What is the maximum leakage current specification for BZX79C15-T50R?
The BZX79C15-T50R specifies a maximum leakage current of 0.05 μA at 12 V reverse bias, measured at TA = 25°C. This ultra-low leakage ensures minimal loading on high-impedance reference nodes and is critical for precision analog circuits. The BZX79C15-T50R maintains this performance across its full operating temperature range, supporting reliable operation in battery-powered instrumentation.
Can BZX79C15-T50R be used in surface-mount designs?
No - the BZX79C15-T50R uses a DO-35 glass axial package designed exclusively for through-hole mounting. Its leads are intended for radial insertion and soldering into plated-through holes. For surface-mount equivalents, consider the MMSZ5245B (SOD-123) or NZ9F15V (SOD-323), which match the BZX79C15-T50R's 15 V rating and electrical behavior but require PCB redesign.
What is the power derating slope for BZX79C15-T50R above 75°C?
The BZX79C15-T50R derates linearly at 4.0 mW/°C above a lead temperature of 75°C, as defined in the Absolute Maximum Ratings table. This means its usable power drops to 400 mW at 100°C lead temperature. This derating ensures safe operation without exceeding junction temperature limits, and must be applied in thermal design calculations for the BZX79C15-T50R in enclosed or high-ambient environments.
BZX79C15-T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 10.5 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
BZX79C15-T50R FAQ
1.How can I place an order for BZX79C15-T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C15-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 BZX79C15-T50R reliable?
The price and inventory of BZX79C15-T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C15-T50R is usually 5 days.
3.What payment methods are accepted for BZX79C15-T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C15-T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C15-T50R?
BZX79C15-T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C15-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 BZX79C15-T50R?
For technical support, including BZX79C15-T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C15-T50R requirements.
6.How does Aetrix verify that BZX79C15-T50R is sourced from the original manufacturer or authorized distributors?
All BZX79C15-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 BZX79C15-T50R meets industry standards.
7.What is the process for return or replacement of BZX79C15-T50R?
All BZX79C15-T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C15-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 BZX79C15-T50R part is unused and in its original packaging.
Return procedure for BZX79C15-T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79C15-T50R Tags
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