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onsemi BZX79C24_T50R
- Part No.:
- BZX79C24_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C24_T50R.pdf
- Description:
- DIODE ZENER 24V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:4,962
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Product details
Overview
BZX79C24_T50R from ON Semiconductor is a 24 V, 5% tolerance, 500 mW DO-35 glass-encapsulated Zener diode optimized for voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and precision biasing networks.
For engineers reviewing the BZX79C24_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy at 5 mA test current, low dynamic impedance (33 Ω), temperature coefficient (+18.4 mV/°C), and leakage current ≤ 0.05 μA at 16.8 V reverse bias - all critical for stable low-power reference design.
Technical Context
The BZX79C24_T50R operates as a two-terminal silicon junction device with controlled reverse-breakdown behavior. Its zener voltage is specified at IZ = 5 mA, with a typical dynamic impedance of 33 Ω and a positive temperature coefficient of +18.4 mV/°C, indicating increasing VZ with rising junction temperature.
It features a maximum power dissipation of 500 mW at lead temperature ≤ 75°C, derating linearly by 4.0 mW/°C above that threshold, and supports operation across –65°C to +200°C ambient and storage conditions - suitable for industrial and automotive under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V min / 25.6 V max at IZ = 5 mA - defines regulated output range for feedback or clamp circuits |
| Tolerance | ±5% - ensures predictable voltage setpoint without post-calibration in cost-sensitive designs |
| Dynamic Impedance (ZZ) | 33 Ω max - limits output voltage variation under load current changes in shunt regulator topologies |
| Leakage Current (IR) | ≤ 0.05 μA at VR = 16.8 V - enables ultra-low standby power in battery-backed systems |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets thermal design boundary for PCB trace width and copper pour |
| Temperature Coefficient (TC) | +18.4 mV/°C - quantifies VZ drift per degree, critical for temperature-stable references |
| Junction Temp Range | –65°C to +200°C - supports extended-range operation in harsh-environment electronics |
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 | Forward conduction terminal / Reverse breakdown reference node | Connected to lower-potential side in shunt regulation; carries full load current during clamping |
| Cathode | Zener voltage reference terminal / Breakdown anode | Marked with color band; connected to higher-potential rail to establish regulated voltage drop |
Key Features
| Feature | Design Value |
|---|---|
| Stable 24 V reference | Guaranteed 22.8–25.6 V range at 5 mA enables repeatable voltage setting without trimming |
| Low leakage current | ≤ 0.05 μA at 16.8 V allows use in micropower sensor nodes and energy-harvesting circuits |
| High-temperature operation | Rated up to +200°C junction temperature supports under-hood automotive and industrial motor control |
| DO-35 mechanical standardization | Industry-standard axial glass package ensures compatibility with legacy through-hole assembly and rework processes |
| 5% voltage tolerance | Cost-effective alternative to tighter-tolerance devices where ±5% regulation meets system requirements |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference providing precise 24 V threshold to TL431 or optocoupler LED drive circuit. Use Value: Maintains ±5% output regulation across line/load variations without auxiliary winding or digital controller. | Use Scenario: Protecting microcontroller I/O pins from transient surges on 24 V industrial fieldbus lines. IC Role / Device Role / Timing Role: Shunt clamp absorbing excess energy when bus voltage exceeds 25.6 V. Use Value: Limits peak voltage to safe level with <0.05 μA standby leakage, preserving signal integrity during normal operation. |
| Temperature-Stable Bias Network | Low-Power Sensor Reference |
Use Scenario: Generating stable bias for op-amp input stages in analog front-ends operating across –40°C to +125°C. IC Role / Device Role / Timing Role: Precision voltage reference compensating for amplifier offset drift. Use Value: +18.4 mV/°C TC enables predictable compensation slope in matched-pair bias circuits. | Use Scenario: Providing excitation voltage for RTD or thermistor bridges in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Low-power voltage reference sourcing <1 μA total current. Use Value: Enables >10-year battery life due to sub-100 nW quiescent power consumption at 16.8 V reverse bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | Same 24 V nominal rating, but ±5% tolerance and 1.0 Ω higher ZZ (34 Ω vs. 33 Ω); DO-41 package (larger footprint) | Higher thermal mass suits higher average power, but requires PCB layout change | Select when board space allows larger package and marginally higher impedance is acceptable |
| BZX55C24 | Same DO-35 package and 24 V rating, but wider VZ spread (22.8–27.2 V) and higher leakage (≤ 0.1 μA) | Less precise regulation; suited for non-critical clamping where cost is primary driver | Choose for cost-sensitive consumer-grade protection where ±5% is sufficient and leakage <0.05 μA is not required |
Compared with 1N4749A and BZX55C24, the BZX79C24_T50R delivers tighter regulation consistency in DO-35 form factor, lower leakage for micropower designs, and superior thermal stability - making it optimal for industrial feedback and precision biasing where package compatibility and parameter repeatability are essential.
Availability
BZX79C24_T50R is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, temperature-stable bias networks, and low-power sensor references requiring stable component supply and long-term manufacturability.
Supply support for BZX79C24_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, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX79C series is designed for general-purpose voltage regulation and reference applications, emphasizing reliability, wide temperature operation, and standardized through-hole packaging for high-volume manufacturing.
FAQ
What is the zener voltage range of the BZX79C24_T50R?
The BZX79C24_T50R has a zener voltage range of 22.8 V minimum to 25.6 V maximum, measured at a test current of 5 mA and ambient temperature of 25°C. This 5% tolerance window ensures predictable regulation performance in feedback and clamp circuits without requiring post-production calibration. The BZX79C24_T50R maintains this specification across its rated operating temperature range.
What is the maximum power dissipation for the BZX79C24_T50R?
The BZX79C24_T50R is rated for 500 mW maximum power dissipation at a lead temperature of 75°C or below. Above 75°C, it derates linearly at 4.0 mW/°C - meaning at 100°C lead temperature, usable power drops to 400 mW. This derating curve must be applied in thermal design to avoid junction overheating. The BZX79C24_T50R's DO-35 package relies on lead conduction for heat transfer, so PCB trace width directly impacts thermal performance.
What is the leakage current specification for the BZX79C24_T50R?
The BZX79C24_T50R exhibits a maximum leakage current of 0.05 μA when reverse-biased at 16.8 V (70% of nominal VZ). This ultra-low leakage enables use in battery-powered systems where standby current must remain below 100 nW. The BZX79C24_T50R achieves this performance while maintaining stable 24 V regulation, distinguishing it from higher-leakage alternatives like BZX55C24.
Does the BZX79C24_T50R have a defined temperature coefficient?
Yes, the BZX79C24_T50R has a specified temperature coefficient of +18.4 mV/°C, indicating its zener voltage increases with rising junction temperature. This positive TC is characteristic of Zener diodes above ~5 V and enables predictable drift compensation in bias networks. The BZX79C24_T50R's TC value is confirmed in the official ON Semiconductor datasheet and applies across its full operating temperature range.
What package type does the BZX79C24_T50R use?
The BZX79C24_T50R uses the DO-35 glass axial package, identified by a cathode color band and standardized lead spacing. This industry-common through-hole package supports wave soldering, manual rework, and legacy assembly lines. The BZX79C24_T50R's DO-35 footprint is identical to other BZX79C-series devices, enabling direct substitution within the same voltage family without layout changes.
BZX79C24_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):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 16.8 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
BZX79C24_T50R FAQ
1.How can I place an order for BZX79C24_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C24_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 BZX79C24_T50R reliable?
The price and inventory of BZX79C24_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C24_T50R is usually 5 days.
3.What payment methods are accepted for BZX79C24_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C24_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C24_T50R?
BZX79C24_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C24_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 BZX79C24_T50R?
For technical support, including BZX79C24_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C24_T50R requirements.
6.How does Aetrix verify that BZX79C24_T50R is sourced from the original manufacturer or authorized distributors?
All BZX79C24_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 BZX79C24_T50R meets industry standards.
7.What is the process for return or replacement of BZX79C24_T50R?
All BZX79C24_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C24_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 BZX79C24_T50R part is unused and in its original packaging.
Return procedure for BZX79C24_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79C24_T50R Tags
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