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onsemi BZX79C3V6_T50R
- Part No.:
- BZX79C3V6_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C3V6_T50R.pdf
- Description:
- DIODE ZENER 3.6V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:4,341
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Product details
Overview
BZX79C3V6_T50R from ON Semiconductor is a 3.6 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 90 Ω dynamic impedance at 5 mA test current and -3.5 mV/°C temperature coefficient. It provides precise voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the BZX79C3V6_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal coefficient, leakage current at 1 V (15 μA max), junction capacitance (185 pF at 0 V), and DO-35 mechanical compatibility with through-hole PCB layouts.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its -3.5 mV/°C temperature coefficient ensures predictable drift behavior, while 90 Ω dynamic impedance at 5 mA supports consistent regulation accuracy in feedback paths.
The device is characterized at 25°C ambient with 3/8″ lead length and specified for operation from -65°C to +200°C. Leakage current remains ≤15 μA at 1 V reverse bias, and forward voltage is ≤1.5 V at 100 mA, enabling bidirectional verification during functional testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 3.4 V min / 3.8 V max at 5 mA - defines usable regulation window for 3.6 V nominal reference |
| Power Dissipation | 500 mW @ TL ≤ 75°C - sets maximum continuous thermal load without derating |
| Dynamic Impedance | 90 Ω max @ IZ = 5 mA - determines output voltage variation under load current changes |
| Temperature Coefficient | -3.5 mV/°C - quantifies voltage drift per degree Celsius for stability-critical designs |
| Junction Capacitance | 185 pF @ 0 V, 1 MHz - impacts high-frequency noise filtering and transient response |
| Leakage Current | 15 μA max @ VR = 1 V - limits standby power loss in always-on bias networks |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; leads are unmarked anode/cathode terminals suitable for through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side in reverse-biased Zener configuration |
| Cathode | Zener breakdown terminal | Marked end; connected to higher potential side to enable regulated voltage drop |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables interchangeability within tight reference bands without recalibration |
| Low temperature coefficient (-3.5 mV/°C) | Minimizes thermal drift in industrial environments where ambient varies ±40°C |
| 500 mW power rating | Supports robust operation in battery-powered sensor nodes with intermittent surge loads |
| DO-35 glass package | Provides hermetic sealing and long-term reliability in humid or corrosive atmospheres |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stable 3.6 V reference for ADC voltage dividers and op-amp biasing in portable instrumentation. IC Role / Device Role / Timing Role: Precision shunt voltage reference providing known node voltage independent of supply ripple. Use Value: Maintains <±1% error over temperature due to matched -3.5 mV/°C TC and tight 5% VZ tolerance. | Use Scenario: Protection of microcontroller I/O pins against ESD-induced transients up to ±8 kV. IC Role / Device Role / Timing Role: Fast-acting shunt clamp that conducts above 3.8 V to divert surge energy to ground. Use Value: Limits clamped voltage to ≤3.8 V with 15 μA leakage at 1 V, minimizing standby loading on protected circuitry. |
| Current Source Bias | Signal Level Shifting |
Use Scenario: Constant-current source for LED biasing in automotive interior lighting modules. IC Role / Device Role / Timing Role: Zener-regulated current mirror reference element establishing stable base current. Use Value: Delivers <2% current variation across -40°C to +125°C using 90 Ω ZZ and -3.5 mV/°C TC compensation. | Use Scenario: DC level translation between 5 V logic and 3.3 V interface ICs in industrial PLC backplanes. IC Role / Device Role / Timing Role: Passive level shifter defining 3.6 V threshold for signal transition detection. Use Value: Enables clean logic-level conversion with 185 pF junction capacitance limiting bandwidth to ~1 MHz-sufficient for RS-485 control signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | 3.3 V nominal, ±5%, 1.0 Ω lower ZZ (89 Ω), same DO-35 package | Slightly lower regulation voltage; tighter ZZ spec but identical thermal drift | Select when 3.3 V reference is acceptable and lower impedance improves loop stability |
| BZX55C3V6 | Same 3.6 V rating, ±5%, but 100 Ω ZZ @ 5 mA and DO-35 package | Higher dynamic impedance reduces regulation precision under load variation | Prefer for cost-sensitive applications where ±2% output variation is tolerable |
Compared with 1N4728A and BZX55C3V6, BZX79C3V6_T50R offers optimal balance of voltage accuracy, thermal stability, and impedance for mid-precision analog references-especially where -3.5 mV/°C TC alignment with other system components is required.
Availability
BZX79C3V6_T50R is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and current source bias applications requiring stable component supply and long-term obsolescence management.
Supply support for BZX79C3V6_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, sensors, and connectivity solutions for automotive, industrial, and consumer markets.
The BZX79C series was designed for general-purpose voltage regulation and protection in cost-sensitive, space-constrained applications where DO-35 reliability and ±5% tolerance meet design requirements without premium packaging.
FAQ
What is the Zener voltage tolerance for BZX79C3V6_T50R?
The BZX79C3V6_T50R has a Zener voltage tolerance of ±5%, resulting in a guaranteed range of 3.4 V to 3.8 V at 5 mA test current. This tolerance is measured under thermal equilibrium conditions at lead temperature of 30°C ±1°C with 3/8″ lead length. The specification ensures predictable performance in voltage reference and clamping circuits where tight regulation bands are required.
What is the maximum power dissipation of BZX79C3V6_T50R and how does it change with temperature?
BZX79C3V6_T50R is rated for 500 mW power dissipation at lead temperature (TL) ≤ 75°C. Above 75°C, it derates linearly at 4.0 mW/°C. This means at 100°C TL, its maximum allowable power drops to 400 mW. The derating curve ensures safe operation across extended industrial temperature ranges without exceeding junction temperature limits.
What is the dynamic impedance of BZX79C3V6_T50R and why does it matter?
The dynamic impedance (ZZ) of BZX79C3V6_T50R is 90 Ω maximum at 5 mA test current. This parameter reflects how much the Zener voltage changes with small variations in current-lower ZZ yields better regulation stability. In practice, this value ensures minimal output voltage shift (<45 mV) for ±0.5 mA load changes, critical for precision analog references.
Does BZX79C3V6_T50R have a specified junction capacitance, and what is its value?
Yes, BZX79C3V6_T50R has a junction capacitance of 185 pF measured at 0 V and 1 MHz. This value affects high-frequency behavior in clamping and filtering applications. For example, in ESD protection, it forms part of the RC time constant with series resistance-185 pF enables effective suppression of transients up to ~1 MHz without excessive signal distortion.
What is the temperature coefficient of BZX79C3V6_T50R and how does it affect circuit performance?
The temperature coefficient of BZX79C3V6_T50R is -3.5 mV/°C, meaning its Zener voltage decreases by 3.5 mV per degree Celsius rise in junction temperature. This predictable drift allows designers to compensate for thermal effects in reference circuits or select complementary components with matching TC, improving overall system stability across operating temperatures.
BZX79C3V6_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):
- 3.6 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 15 µA @ 1 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
BZX79C3V6_T50R FAQ
1.How can I place an order for BZX79C3V6_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C3V6_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 BZX79C3V6_T50R reliable?
The price and inventory of BZX79C3V6_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C3V6_T50R is usually 5 days.
3.What payment methods are accepted for BZX79C3V6_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C3V6_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C3V6_T50R?
BZX79C3V6_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C3V6_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 BZX79C3V6_T50R?
For technical support, including BZX79C3V6_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C3V6_T50R requirements.
6.How does Aetrix verify that BZX79C3V6_T50R is sourced from the original manufacturer or authorized distributors?
All BZX79C3V6_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 BZX79C3V6_T50R meets industry standards.
7.What is the process for return or replacement of BZX79C3V6_T50R?
All BZX79C3V6_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C3V6_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 BZX79C3V6_T50R part is unused and in its original packaging.
Return procedure for BZX79C3V6_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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