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onsemi BZX79C2V4-T50A
- Part No.:
- BZX79C2V4-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C2V4-T50A.pdf
- Description:
- DIODE ZENER 2.4V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:9,475
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Product details
Overview
BZX79C2V4-T50A from ON Semiconductor is a 2.4 V, ±5% tolerance, 500 mW glass-passivated Zener diode in DO-35 package, designed for voltage regulation and reference applications in low-power analog circuits, power supply feedback loops, and overvoltage protection at ambient temperatures up to +200°C.
For engineers reviewing the BZX79C2V4-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy (2.2–2.6 V), dynamic impedance (100 Ω @ 5 mA), temperature coefficient (−3.5 mV/°C), leakage current (≤100 μA @ 1 V), and thermal stability across −65°C to +200°C operating range.
Technical Context
The BZX79C2V4-T50A operates as a reverse-biased silicon Zener diode with sharp breakdown knee at nominal 2.4 V, optimized for stable DC voltage reference generation under low-current conditions (IZ = 5 mA). Its negative temperature coefficient (−3.5 mV/°C) enables predictable drift compensation in precision bias networks.
Designed for surface-mount compatible through-hole assembly, it uses a DO-35 glass axial package with cathode band marking, rated for 500 mW dissipation at TL ≤ 75°C and derated linearly at 4.0 mW/°C above that temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.2 V min / 2.6 V max at IZ = 5 mA - defines regulation window for low-voltage reference stability |
| Tolerance | ±5% - ensures predictable voltage clamping within tight analog signal chains |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - supports continuous operation in compact PCB layouts without forced cooling |
| Dynamic Impedance (ZZ) | 100 Ω max @ IZ = 5 mA - limits output voltage variation under load transients |
| Temperature Coefficient (TC) | −3.5 mV/°C - enables predictable downward drift for thermal compensation in bias networks |
| Leakage Current (IR) | ≤100 μA @ VR = 1 V - ensures minimal error current in high-impedance reference nodes |
| Operating Temperature | −65°C to +200°C - suitable for under-hood automotive, industrial sensor, and aerospace environments |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device with no internal connections beyond anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-bias regulation configuration |
| Cathode | Zener breakdown terminal | Marked with color band; connected to regulated voltage rail or feedback node |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage Zener reference | Stable 2.4 V regulation ideal for 3.3 V and 2.5 V system biasing and sensing |
| Glass passivation | Enhanced moisture resistance and long-term parameter stability vs. plastic-packaged alternatives |
| Negative TC matching | −3.5 mV/°C enables direct compensation of positive-drift components like BJTs or op-amp inputs |
| High-temperature operation | Rated up to +200°C junction temperature - validated for engine control, downhole, and industrial motor drive use |
Applications
| Automotive Engine Control Unit (ECU) Sensor Biasing | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Providing stable 2.4 V reference for thermistor or RTD signal conditioning in ECU ambient temperature monitoring circuits. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precise bias point for op-amp front-end amplifiers. Use Value: Maintains <±1% reference accuracy across −40°C to +150°C ambient due to matched TC and low ZZ. | Use Scenario: Clamping transient overvoltage on 4–20 mA current loop input channels exposed to field wiring surges. IC Role / Device Role / Timing Role: Low-energy shunt protector limiting input voltage to ADC driver stage during ESD or inductive kick events. Use Value: Responds within nanoseconds to clamp spikes to ≤2.6 V while dissipating <50 mW peak energy per event. |
| Medical Wearable Battery Monitoring | Consumer IoT Power Supply Feedback |
Use Scenario: Generating accurate threshold voltage for lithium battery cell undervoltage detection in compact wearable devices. IC Role / Device Role / Timing Role: Precision voltage comparator reference enabling reliable 2.4 V cutoff decision with minimal quiescent current draw. Use Value: Delivers sub-10 μA leakage at 1.8 V bias, extending battery life while maintaining ±5% trip-point repeatability. | Use Scenario: Setting feedback voltage for secondary-side optocoupler-based regulation in isolated AC/DC adapters. IC Role / Device Role / Timing Role: Zener reference defining regulated output voltage via TL431 or similar shunt regulator feedback network. Use Value: Enables ±2% output regulation tolerance with <0.5% unit-to-unit VZ variation across production lots. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4730A | Same 3.9 V nominal rating but higher PD (1 W), larger DO-41 package, +2 mV/°C TC | Not suitable for 2.4 V reference; requires redesign of resistor divider and layout space | Select only if higher power and different voltage are acceptable |
| BZX55C2V4 | Same 2.4 V rating and DO-35 package, but ±5% tolerance and 500 mW rating; TC = −3.5 mV/°C confirmed | Drop-in replacement with identical electrical and mechanical fit; same marking convention and sourcing footprint | Valid alternative when BZX79C2V4-T50A is unavailable; verify batch traceability for medical/automotive use |
Compared with 1N4730A and BZX55C2V4, the BZX79C2V4-T50A offers optimal combination of low-voltage precision, DO-35 form factor, and high-temperature capability-making it preferred for space-constrained, thermally demanding analog references where 2.4 V regulation is required.
Availability
BZX79C2V4-T50A is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical wearable battery management systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BZX79C2V4-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 (now onsemi) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX79C series is part of ON Semiconductor's legacy Zener diode portfolio engineered for high-reliability voltage reference and regulation in harsh-environment applications demanding wide temperature operation and long-term parametric stability.
FAQ
What is the nominal Zener voltage and tolerance of the BZX79C2V4-T50A?
The BZX79C2V4-T50A has a nominal Zener voltage of 2.4 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 2.2 V and 2.6 V when tested at 5 mA Zener current and 25°C ambient. This specification is verified per ON Semiconductor's BZX79C2V4/D datasheet Rev. 3 and applies directly to the BZX79C2V4-T50A variant.
What is the maximum power dissipation and thermal derating behavior of the BZX79C2V4-T50A?
The BZX79C2V4-T50A is rated for 500 mW power dissipation at lead temperature (TL) ≤ 75°C with 3/8″ lead length. Above 75°C, it derates linearly at 4.0 mW/°C. This thermal profile allows safe operation in high-ambient environments when mounted per JEDEC standards, and is a defined limit for the BZX79C2V4-T50A in all official ON Semiconductor documentation.
Does the BZX79C2V4-T50A have a positive or negative temperature coefficient, and what is its value?
The BZX79C2V4-T50A exhibits a negative temperature coefficient of −3.5 mV/°C, meaning its Zener voltage decreases predictably as temperature increases. This value is specified in the Electrical Characteristics table of the ON Semiconductor BZX79C2V4/D datasheet and is consistent across the BZX79C2V4-T50A production lot.
What package type and marking does the BZX79C2V4-T50A use?
The BZX79C2V4-T50A uses the DO-35 glass axial package with cathode identified by a color band. Marking consists of "LOGO" on line 1, "9C" on line 2, and "2V4" on line 3 - confirming its identity as a BZX79C-series 2.4 V Zener diode. This marking scheme is standardized per ON Semiconductor's top-mark information guide for the BZX79C2V4-T50A.
Is the BZX79C2V4-T50A suitable for high-temperature applications such as under-hood automotive use?
Yes, the BZX79C2V4-T50A is rated for operating and storage temperatures from −65°C to +200°C, making it suitable for under-hood automotive applications including engine control modules and transmission sensors. This full temperature range is explicitly guaranteed for the BZX79C2V4-T50A in ON Semiconductor's Absolute Maximum Ratings table.
BZX79C2V4-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):
- 2.4 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 100 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
BZX79C2V4-T50A FAQ
1.How can I place an order for BZX79C2V4-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C2V4-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 BZX79C2V4-T50A reliable?
The price and inventory of BZX79C2V4-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C2V4-T50A is usually 5 days.
3.What payment methods are accepted for BZX79C2V4-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C2V4-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C2V4-T50A?
BZX79C2V4-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C2V4-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 BZX79C2V4-T50A?
For technical support, including BZX79C2V4-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C2V4-T50A requirements.
6.How does Aetrix verify that BZX79C2V4-T50A is sourced from the original manufacturer or authorized distributors?
All BZX79C2V4-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 BZX79C2V4-T50A meets industry standards.
7.What is the process for return or replacement of BZX79C2V4-T50A?
All BZX79C2V4-T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C2V4-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 BZX79C2V4-T50A part is unused and in its original packaging.
Return procedure for BZX79C2V4-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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