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onsemi BZX79C36-T50A
- Part No.:
- BZX79C36-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C36-T50A.pdf
- Description:
- DIODE ZENER 36V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:170,000
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Product details
Overview
BZX79C36-T50A from onsemi is a 36 V ±5% tolerance, 500 mW axial-lead Zener diode in DO-204AH (Case 017AG) glass package, rated for 5 mA test current, 100 Ω dynamic impedance, and −3.5 mV/°C temperature coefficient - used for precision voltage regulation and reference in low-power analog circuits.
For engineers reviewing the BZX79C36-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage stability at 5 mA, thermal coefficient matching, leakage current under reverse bias, and compatibility with through-hole PCB assembly using 3/8″ lead length.
Technical Context
The BZX79C36-T50A operates as a silicon planar Zener diode with controlled avalanche breakdown at nominal 36 V, optimized for stable DC voltage reference in power supply feedback paths and sensor biasing networks. Its −3.5 mV/°C temperature coefficient ensures predictable drift over −65°C to +200°C operating range.
Designed for thermal equilibrium measurement at 30°C lead temperature (TL), it maintains 100 Ω dynamic impedance (ZZ) at IZ = 5 mA and exhibits ≤100 nA leakage current (IR) at VR = 28.8 V - enabling reliable clamping and regulation in space-constrained linear regulator designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 34.2 V min / 37.8 V max @ IZ = 5 mA - defines regulated output range for feedback or reference use |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous dissipation without derating |
| Dynamic Impedance (ZZ) | 100 Ω max @ IZ = 5 mA - determines regulation stiffness under load variation |
| Temperature Coefficient (TC) | −3.5 mV/°C - quantifies voltage drift per degree Celsius for thermal design margining |
| Leakage Current (IR) | 100 nA max @ VR = 28.8 V - ensures minimal error current in high-impedance reference nodes |
| Capacitance (C) | 47 pF max @ VZ = 0 V, f = 1 MHz - impacts high-frequency noise coupling in filtering applications |
Pinout & Package
DO-204AH (Case 017AG) axial-lead hermetically sealed glass package, 4.56 mm body length × 1.91 mm diameter, 3/8″ (9.5 mm) lead length standard, weight 0.137 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / cathode reference ground node | Connected to circuit ground or lower potential side in reverse-biased Zener operation |
| Cathode | Zener breakdown terminal / regulated voltage output node | Provides stable 36 V reference when reverse biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables tight regulation without post-production trimming in cost-sensitive consumer power supplies |
| Hermetically sealed glass package | Ensures long-term parameter stability and moisture resistance in industrial environments |
| −65°C to +200°C operating range | Supports deployment in under-hood automotive modules and high-temp industrial controls |
| 100 nA max leakage at 28.8 V | Minimizes loading error in high-impedance op-amp reference circuits and sensor bridges |
Applications
| Power Supply Feedback | Sensor Bias Reference |
|---|---|
Use Scenario: Regulating output voltage in discrete linear regulators or TL431-based shunt regulators. IC Role / Device Role / Timing Role: Zener voltage reference element providing precise 36 V threshold for error amplifier comparison. Use Value: Maintains ±1% output accuracy over temperature due to matched TC and low ZZ. | Use Scenario: Supplying stable excitation voltage to resistive temperature detectors (RTDs) or strain gauges. IC Role / Device Role / Timing Role: Low-drift DC reference source replacing higher-cost IC references in analog front-ends. Use Value: Delivers <10 ppm/°C effective drift via −3.5 mV/°C TC and 100 nA IR, reducing calibration burden. |
| Voltage Clamp Protection | Signal Level Translation |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage in industrial fieldbus interfaces. IC Role / Device Role / Timing Role: Reverse-biased clamping device limiting input voltage to 36 V during surge events. Use Value: Absorbs up to 500 mW transient energy without degradation, meeting IEC 61000-4-5 Level 3 requirements. | Use Scenario: Shifting logic-level signals between 5 V and 36 V domains in PLC input conditioning circuits. IC Role / Device Role / Timing Role: Passive level translator using forward conduction (VF ≤ 1.2 V) and reverse Zener action. Use Value: Enables bidirectional translation with <1.2 V forward drop and sharp 36 V reverse knee for clean edge detection. |
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, ±5% tolerance, but 1.0 W rating and DO-41 package (larger footprint) | Higher power handling supports >500 mW transient clamping; requires larger PCB pad layout | Select when thermal margin or surge energy absorption exceeds 500 mW limits of BZX79C36-T50A |
| BZX55C36 | 36 V, ±5%, 500 mW, but DO-35 package (smaller glass body, 2.5 mm diameter vs. 1.91 mm) | Lower capacitance (40 pF) and tighter thermal resistance; less robust mechanical mounting | Choose for space-constrained layouts where 0.4 mm diameter reduction enables denser placement |
Compared with 1N4736A and BZX55C36, the BZX79C36-T50A offers optimal balance of DO-204AH mechanical reliability, standardized fan-fold packaging (T50A), and verified −3.5 mV/°C TC for temperature-critical references - making it preferred for automotive-grade analog subsystems requiring traceable sourcing and consistent thermal behavior.
Availability
BZX79C36-T50A is available at Aetrix Electronics and suitable for power supply feedback, sensor bias reference, voltage clamp protection, and signal level translation requiring stable component supply across automotive, industrial control, and instrumentation programs.
Supply support for BZX79C36-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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The BZX79C series is part of onsemi's legacy Zener diode portfolio designed specifically for general-purpose voltage regulation and reference in cost-sensitive, high-reliability through-hole applications - emphasizing parameter consistency, glass-package longevity, and JEDEC-compliant manufacturability.
FAQ
What is the Zener voltage tolerance of the BZX79C36-T50A?
The BZX79C36-T50A has a Zener voltage tolerance of ±5% at 5 mA test current, yielding a guaranteed range of 34.2 V to 37.8 V. This tolerance is specified per onsemi's BZX79C2V4–BZX79C18 datasheet Rev. 5 and applies directly to the BZX79C36-T50A variant. Tight tolerance enables accurate voltage setting without external trimming in production-grade power supplies.
Does the BZX79C36-T50A have a specified forward voltage?
Yes, the BZX79C36-T50A has a maximum forward voltage (VF) of 1.2 V at 200 mA forward current, as stated in the Absolute Maximum Ratings section of the onsemi datasheet. This value is critical for applications using the diode in forward conduction mode, such as level-shifting or polarity protection circuits where low conduction loss is required.
What is the package type and lead configuration of the BZX79C36-T50A?
The BZX79C36-T50A uses the DO-204AH (Case 017AG) axial-lead hermetically sealed glass package with 3/8″ (9.5 mm) lead length. The "T50A" suffix denotes fan-fold tape packaging for automated insertion - distinct from bulk bag or tape-and-reel variants. Dimensions are 4.56 mm body length × 1.91 mm diameter, per mechanical outline documentation.
How does the temperature coefficient affect BZX79C36-T50A performance?
The BZX79C36-T50A has a temperature coefficient of −3.5 mV/°C, meaning its Zener voltage decreases by 3.5 mV per degree Celsius rise in junction temperature. This negative TC is typical for Zeners above ~6 V and must be accounted for in precision reference designs operating across wide ambient ranges - especially in automotive under-hood applications where ambient can exceed 125°C.
Can the BZX79C36-T50A replace the BZX79C33 or BZX79C39 in a circuit?
No - the BZX79C36-T50A is not a direct replacement for BZX79C33 (33 V) or BZX79C39 (39 V), as each variant has distinct Zener voltage, dynamic impedance, and temperature coefficient values. Substituting alters regulation point and thermal drift behavior. Circuit redesign and validation are required if changing Zener voltage; always verify VZ, ZZ, and TC match target system requirements before substitution.
BZX79C36-T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- 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-T50A FAQ
1.How can I place an order for BZX79C36-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C36-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 BZX79C36-T50A reliable?
The price and inventory of BZX79C36-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C36-T50A is usually 5 days.
3.What payment methods are accepted for BZX79C36-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C36-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C36-T50A?
BZX79C36-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C36-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 BZX79C36-T50A?
For technical support, including BZX79C36-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C36-T50A requirements.
6.How does Aetrix verify that BZX79C36-T50A is sourced from the original manufacturer or authorized distributors?
All BZX79C36-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 BZX79C36-T50A meets industry standards.
7.What is the process for return or replacement of BZX79C36-T50A?
All BZX79C36-T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C36-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 BZX79C36-T50A part is unused and in its original packaging.
Return procedure for BZX79C36-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79C36-T50A Tags
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