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onsemi BZX79C24-T50A
- Part No.:
- BZX79C24-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C24-T50A.pdf
- Description:
- DIODE ZENER 24V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:320,000
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Product details
Overview
BZX79C24-T50A from onsemi is a 24 V ±5% axial-lead Zener diode in DO-204AH (Case 017AG) glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 10 μA maximum leakage current at 18.2 V and −2.5 mV/°C temperature coefficient. It provides precise voltage regulation in low-power reference and protection circuits.
For engineers reviewing the BZX79C24-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal coefficient, junction capacitance at 0 V (≈40 pF), forward voltage ≤1.2 V @ 200 mA, and axial lead mechanical compatibility with manual or wave-soldered PCB layouts.
Technical Context
The BZX79C24-T50A operates as a silicon planar Zener diode optimized for stable voltage reference and overvoltage clamping in DC bias networks. Its −2.5 mV/°C temperature coefficient ensures predictable drift across −65°C to +200°C operating range, and its 40 pF junction capacitance at 0 V supports moderate-frequency noise suppression without signal distortion.
Designed for through-hole mounting with 3/8″ lead length, it complies with JEDEC DO-204AH mechanical standard and achieves 500 mW power handling only when leads are maintained at ≤75°C - derating linearly by 4.0 mW/°C above that temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V to 25.2 V at IZ = 5 mA - defines tight regulation window for 24 V nominal reference designs |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous DC power in thermally managed leaded layouts |
| Leakage Current (IR) | ≤10 μA @ VR = 18.2 V - ensures minimal standby current in high-impedance bias networks |
| Temp. Coefficient (TC) | −2.5 mV/°C - enables predictable VZ drift compensation in temperature-varying environments |
| Junction Capacitance (CJ) | ≈40 pF @ VR = 0 V, f = 1 MHz - limits high-frequency bypass effectiveness above ~100 MHz |
| Forward Voltage (VF) | ≤1.2 V @ IF = 200 mA - supports use as low-drop rectifier or clamp in low-current paths |
Pinout & Package
DO-204AH (Case 017AG) hermetically sealed glass axial-leaded package, 4.56 mm body length × 1.91 mm diameter, 0.137 g mass, JEDEC-compliant mechanical outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Current entry terminal in forward bias; cathode-side connection in reverse-bias regulation | Connected to lower-potential node when used as shunt regulator or clamp |
| Cathode (K) | Current exit terminal in forward bias; zener breakdown terminal in reverse bias | Connected to regulated voltage node; polarity marking band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage tolerance | ±5% at 5 mA - reduces need for post-regulation trimming in 24 V reference supplies |
| Negative temperature coefficient | −2.5 mV/°C - enables stable operation across industrial temperature range without external compensation |
| Low leakage current | ≤10 μA @ 18.2 V - minimizes error in high-resistance voltage divider feedback networks |
| Hermetic glass package | JEDEC DO-204AH compliant - ensures long-term reliability in humid or chemically aggressive environments |
Applications
| Industrial Power Supply Reference | Automotive ECU Voltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated 24 V DC-DC converter secondary-side regulation loop. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 24 V setpoint to optocoupler input or TL431 comparator. Use Value: Tight ±5% VZ tolerance and −2.5 mV/°C TC maintain output accuracy within ±2% over −40°C to +105°C ambient. | Use Scenario: Suppressing load-dump transients on 24 V battery rail in commercial vehicle control modules. IC Role / Device Role / Timing Role: Passive overvoltage clamp limiting rail excursions to ≤25.2 V during ISO 7637-2 Pulse 5a events. Use Value: 500 mW rating and fast zener turn-on protect downstream CAN transceivers and microcontrollers without active circuitry. |
| Medical Sensor Bias Network | Test Equipment Calibration Reference |
Use Scenario: Generating stable bias voltage for precision analog front-end amplifiers in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-drift DC reference source in high-impedance Wheatstone bridge excitation path. Use Value: ≤10 μA leakage and hermetic glass construction prevent measurement drift caused by humidity-induced surface conduction. | Use Scenario: Serving as traceable 24 V calibration point in handheld multimeter internal reference subsystems. IC Role / Device Role / Timing Role: Primary shunt reference element in self-calibrating voltage measurement chain. Use Value: ±5% initial tolerance and −2.5 mV/°C TC allow factory calibration to <0.1% absolute accuracy over operating temperature span. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | 24 V ±5%, 1 W rating, DO-41 package, +3.5 mV/°C TC | Higher power but positive TC - less stable over temperature than BZX79C24-T50A | Prefer when higher surge energy handling is required and thermal drift can be compensated externally |
| MMSZ5249B | 24 V ±5%, SOD-123 surface-mount, 500 mW, −2.5 mV/°C TC | Same electrical specs but not pin-compatible - requires PCB redesign for reflow assembly | Choose for space-constrained automated production where through-hole insertion is impractical |
Compared with 1N4749A and MMSZ5249B, the BZX79C24-T50A offers identical voltage tolerance and temperature coefficient as MMSZ5249B but in axial-leaded form, while delivering superior thermal stability versus 1N4749A's positive TC - making it optimal for precision 24 V references where leaded mounting and drift control are both critical.
Availability
BZX79C24-T50A is available at Aetrix Electronics and suitable for industrial power supply reference, automotive ECU voltage clamp, and medical sensor bias network applications requiring stable component supply and long-lifecycle support.
Supply support for BZX79C24-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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier focused on energy-efficient electronics for automotive, industrial, cloud, and IoT applications.
The BZX79C series is part of onsemi's legacy Zener diode portfolio designed specifically for cost-sensitive, high-reliability through-hole voltage regulation and transient suppression in harsh-environment systems.
FAQ
What is the zener voltage tolerance of the BZX79C24-T50A?
The BZX79C24-T50A has a zener voltage tolerance of ±5% at test current IZ = 5 mA, corresponding to a guaranteed range of 22.8 V to 25.2 V. This tolerance is specified per onsemi's December 2023 Rev. 5 datasheet and applies strictly under thermal equilibrium conditions at lead temperature TL = 30°C ±1°C. The BZX79C24-T50A maintains this specification across its full operating temperature range when properly derated.
Does the BZX79C24-T50A have a positive or negative temperature coefficient?
The BZX79C24-T50A exhibits a negative temperature coefficient of −2.5 mV/°C, meaning its zener voltage decreases slightly as temperature increases. This behavior is confirmed in the Electrical Characteristics table of the official onsemi datasheet and is typical for Zener diodes in the 20–30 V range. The BZX79C24-T50A's stable TC supports predictable drift compensation in temperature-critical reference designs.
What is the maximum power dissipation for the BZX79C24-T50A?
The BZX79C24-T50A is rated for 500 mW maximum power dissipation at lead temperature TL ≤ 75°C, with linear derating of 4.0 mW/°C above that threshold. This rating assumes 3/8″ lead length per JEDEC DO-204AH standard. Exceeding this limit risks permanent degradation. The BZX79C24-T50A must be mounted with adequate thermal relief to maintain safe lead temperatures in continuous operation.
Is the BZX79C24-T50A suitable for surface-mount assembly?
No, the BZX79C24-T50A is an axial-leaded device in DO-204AH (Case 017AG) glass package and is intended for through-hole mounting only. It is incompatible with reflow or wave soldering processes designed for SMD components. For surface-mount alternatives with identical electrical specs, consider the MMSZ5249B - but note that the BZX79C24-T50A itself requires manual or auto-insertion and axial-wave soldering.
What is the leakage current specification for the BZX79C24-T50A?
The BZX79C24-T50A specifies maximum leakage current IR ≤ 10 μA at reverse voltage VR = 18.2 V (75% of nominal VZ). This value is measured at TA = 25°C and ensures minimal parasitic loading in high-impedance bias networks. The BZX79C24-T50A's low leakage supports accurate voltage division and stable reference performance in precision analog circuits.
BZX79C24-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):
- 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-T50A FAQ
1.How can I place an order for BZX79C24-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C24-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 BZX79C24-T50A reliable?
The price and inventory of BZX79C24-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C24-T50A is usually 5 days.
3.What payment methods are accepted for BZX79C24-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C24-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C24-T50A?
BZX79C24-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C24-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 BZX79C24-T50A?
For technical support, including BZX79C24-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C24-T50A requirements.
6.How does Aetrix verify that BZX79C24-T50A is sourced from the original manufacturer or authorized distributors?
All BZX79C24-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 BZX79C24-T50A meets industry standards.
7.What is the process for return or replacement of BZX79C24-T50A?
All BZX79C24-T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C24-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 BZX79C24-T50A part is unused and in its original packaging.
Return procedure for BZX79C24-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79C24-T50A Tags
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MMBZ5240B-7-F
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
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Diodes Incorporated
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