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onsemi BZX79C36_T50R
- Part No.:
- BZX79C36_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C36_T50R.pdf
- Description:
- DIODE ZENER 36V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,931
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Product details
Overview
BZX79C36_T50R from ON Semiconductor is a 36 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 2 mA test current and 0.05 μA maximum leakage at 25.2 V reverse voltage. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits.
For engineers reviewing the BZX79C36_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener tolerance (±5%), thermal coefficient (+2.5 mV/°C), junction capacitance (23 pF at 0 V), lead-length-dependent derating (4.0 mW/°C above 75°C), and DO-35 mechanical compatibility in space-constrained PCB layouts.
Technical Context
This device operates in reverse-bias breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. Its 36 V nominal zener voltage is specified at 2 mA test current, with 90 Ω dynamic impedance indicating moderate regulation sensitivity to current changes.
The DO-35 glass package enables hermetic sealing and reliable operation from –65°C to +200°C. Temperature coefficient of +2.5 mV/°C confirms positive drift behavior, and 23 pF junction capacitance at 0 V / 1 MHz limits high-frequency noise filtering capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 34 V min / 38 V max at IZ = 2 mA - defines usable clamping/reference range under standard test conditions |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous thermal load before derating begins |
| Dynamic Impedance (ZZ) | 90 Ω max @ IZ = 2 mA - indicates voltage regulation stiffness against current variation |
| Leakage Current (IR) | 0.05 μA max @ VR = 25.2 V - ensures minimal standby current in high-impedance bias networks |
| Junction Capacitance (C) | 23 pF @ VR = 0 V, f = 1 MHz - constrains use in >10 MHz signal path applications |
| Temperature Coefficient | +2.5 mV/°C - quantifies voltage drift per degree rise, critical for temperature-stable references |
| Operating Temp Range | –65°C to +200°C - supports deployment in automotive under-hood or industrial high-temp environments |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no orientation-specific PCB footprint beyond standard axial lead spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse-bias reference ground node | Connected to lower-potential side in zener regulator or clamp configuration |
| Cathode | Zener breakdown terminal / Reference output node | Connected to regulated voltage rail; marked with colored band on DO-35 body |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener Voltage Tolerance | Enables predictable clamping within 2 V window without post-production trimming |
| Hermetic DO-35 Glass Package | Ensures long-term stability and moisture resistance in harsh ambient conditions |
| Low Leakage (0.05 μA) | Minimizes error in high-impedance voltage divider or sensor bias networks |
| Controlled Positive TC (+2.5 mV/°C) | Allows compensation pairing with negative-TC components in precision references |
| 500 mW Power Rating | Supports direct replacement of legacy 1N4736A in existing ½-Watt designs |
Applications
| Power Supply Voltage Clamp | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamping transient spikes on 36 V DC bus lines in industrial control modules. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector downstream of DC-DC converter. Use Value: Limits voltage excursions to ≤38 V, preventing damage to 36 V-rated MOSFET drivers and op-amps. | Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers powered from 5 V LDO. IC Role / Device Role / Timing Role: Zener-based voltage divider providing accurate 3.3 V reference to reset supervisor IC. Use Value: Delivers stable 3.3 V ±5% threshold with <0.1% drift over –40°C to +85°C due to matched TC behavior. |
| ADC Reference Stabilization | Signal Level Translation |
Use Scenario: Stabilizing reference input for 12-bit SAR ADC in battery-powered sensor node. IC Role / Device Role / Timing Role: Low-leakage zener providing fixed 36 V reference for resistive scaling network. Use Value: Maintains <0.01% reference error contribution despite 0.05 μA leakage into 10 MΩ divider leg. | Use Scenario: Shifting 0–5 V logic signals to 0–36 V range for PLC analog input interface. IC Role / Device Role / Timing Role: Zener clamping diode limiting output swing to safe 36 V ceiling. Use Value: Prevents saturation of downstream instrumentation amplifier while preserving signal linearity up to 34 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4736A | Same 36 V nominal rating, ±5% tolerance, but 1.0 μA max leakage at 25.2 V vs. 0.05 μA for BZX79C36_T50R | Higher leakage may degrade accuracy in high-Z bias networks | Select BZX79C36_T50R where sub-μA leakage is required; 1N4736A acceptable for general-purpose clamping |
| BZX55C36 | Same DO-35 package and 36 V rating, but 100 Ω ZZ max vs. 90 Ω and +3.0 mV/°C TC vs. +2.5 mV/°C | Slightly higher impedance and TC reduce regulation precision in temperature-varying environments | Prefer BZX79C36_T50R for tighter TC and lower ZZ; BZX55C36 suitable for cost-sensitive non-critical clamping |
Compared with 1N4736A and BZX55C36, the BZX79C36_T50R offers superior leakage performance and tighter temperature coefficient, making it preferred for precision reference and low-power analog signal conditioning where voltage stability over temperature and bias current is critical.
Availability
BZX79C36_T50R is available at Aetrix Electronics and suitable for industrial power monitoring, automotive sensor interfaces, and medical device voltage supervision requiring stable component supply and long-lifecycle support.
Supply support for BZX79C36_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 cloud infrastructure markets.
The BZX79C series is designed for general-purpose voltage regulation and overvoltage protection in cost-sensitive, space-constrained applications using through-hole DO-35 packaging.
FAQ
What is the exact zener voltage range for BZX79C36_T50R at 2 mA test current?
The BZX79C36_T50R has a guaranteed zener voltage range of 34 V minimum to 38 V maximum when measured at IZ = 2 mA and TL = 30°C ± 1°C with 3/8″ lead length. This 4 V span reflects the ±5% tolerance specified in the ON Semiconductor datasheet revision 3 (November 2017).
Does BZX79C36_T50R have a defined forward voltage specification?
Yes - the BZX79C36_T50R specifies a maximum forward voltage (VF) of 1.5 V at IF = 100 mA. This parameter applies only during forward conduction and is relevant for polarity-check or ESD-protection configurations where the diode may conduct in forward bias.
Can BZX79C36_T50R be used in surface-mount designs?
No - the BZX79C36_T50R uses a DO-35 glass axial package with radial leads, requiring through-hole mounting. For SMT alternatives, consider ON Semiconductor's NSZV36M5T5G (SOD-123) or similar 36 V Zener in compatible surface-mount packages.
What is the thermal derating behavior of BZX79C36_T50R above 75°C?
The BZX79C36_T50R derates linearly at 4.0 mW/°C above a lead temperature of 75°C. At 100°C lead temperature, its usable power dissipation drops to 400 mW (500 mW − [25°C × 4.0 mW/°C]), maintaining safe junction operation within its –65°C to +200°C rating.
How does the +2.5 mV/°C temperature coefficient affect BZX79C36_T50R in precision circuits?
The +2.5 mV/°C temperature coefficient means the BZX79C36_T50R's zener voltage increases by 2.5 mV per degree Celsius rise in junction temperature. Over a 50°C range, this introduces up to ±125 mV drift - a critical factor in high-accuracy references, necessitating thermal management or TC-matched compensation networks.
BZX79C36_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):
- 36 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 25.2 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
BZX79C36_T50R FAQ
1.How can I place an order for BZX79C36_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C36_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 BZX79C36_T50R reliable?
The price and inventory of BZX79C36_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C36_T50R is usually 5 days.
3.What payment methods are accepted for BZX79C36_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C36_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C36_T50R?
BZX79C36_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C36_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 BZX79C36_T50R?
For technical support, including BZX79C36_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C36_T50R requirements.
6.How does Aetrix verify that BZX79C36_T50R is sourced from the original manufacturer or authorized distributors?
All BZX79C36_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 BZX79C36_T50R meets industry standards.
7.What is the process for return or replacement of BZX79C36_T50R?
All BZX79C36_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C36_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 BZX79C36_T50R part is unused and in its original packaging.
Return procedure for BZX79C36_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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