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onsemi BZX79C24
- Part No.:
- BZX79C24
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C24.pdf
- Description:
- DIODE ZENER 24V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:2,359
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Product details
Overview
BZX79C24 from ON Semiconductor is a 24 V, 5% tolerance, 500 mW glass-passivated Zener diode in DO-35 package, designed for voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and precision biasing networks.
For engineers reviewing the BZX79C24 datasheet, pinout, applications, or equivalent options, key selection criteria include its 22.8–25.6 V zener voltage range at 5 mA test current, 70 Ω dynamic impedance, 0.05 μA leakage at 16.8 V, ±3.8 mV/°C temperature coefficient, and DO-35 thermal derating profile.
Technical Context
The BZX79C24 operates as a reverse-biased silicon junction device with stable breakdown behavior under controlled current conditions. Its zener voltage is specified at IZ = 5 mA, with dynamic impedance measured at the same bias point and temperature coefficient derived from VZ drift across operating temperature.
It features glass passivation for enhanced reliability and moisture resistance, and its DO-35 axial leaded package supports through-hole mounting with cathode band identification. Thermal performance is defined up to TL = 75°C, with linear derating beyond that point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V min to 25.6 V max at IZ = 5 mA - defines regulated output voltage window under nominal bias |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling before thermal derating begins |
| Dynamic Impedance (ZZ) | 70 Ω max at IZ = 5 mA - determines regulation stiffness and output voltage variation under load changes |
| Leakage Current (IR) | 0.05 μA max at VR = 16.8 V - ensures minimal parasitic current in off-state or standby operation |
| Temperature Coefficient (TC) | ±3.8 mV/°C - quantifies VZ drift per degree Celsius, critical for temperature-stable references |
| Junction Temperature Range | −65°C to +200°C - enables use in extended industrial and automotive under-hood environments |
| Capacitance (C) | 33 pF max at VR = 0 V, f = 1 MHz - impacts high-frequency noise filtering and transient response |
Pinout & Package
DO-35 glass axial-leaded package with cathode identified by a color band on the body. Leads are tinned copper-clad steel, suitable for wave or hand soldering. Package dimensions conform to JEDEC DO-35 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node when used in reverse-bias regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Connected to regulated node; marked by color band; carries reverse current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables predictable regulation without post-production trimming in cost-sensitive designs |
| Glass passivated junction | Provides superior long-term stability and humidity resistance vs. epoxy-coated alternatives |
| DO-35 mechanical standardization | Ensures compatibility with legacy PCB footprints and automated insertion equipment |
| Low leakage at rated VR | Minimizes quiescent current draw in battery-powered or low-power monitoring circuits |
| Controlled temperature coefficient | Supports stable reference generation across −40°C to +125°C ambient ranges |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Used in the optocoupler feedback path of isolated AC/DC flyback converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference element setting error amplifier threshold in secondary-side regulation loop. Use Value: Delivers stable 24 V reference with <70 Ω impedance, minimizing output ripple and improving load regulation accuracy. | Use Scenario: Placed across DC bus rails in motor drive inverters to limit transient overvoltage spikes. IC Role / Device Role / Timing Role: Passive shunt clamp absorbing energy during IGBT switching transients. Use Value: Activates at 22.8–25.6 V to divert surge current before downstream MOSFETs exceed VDS(max). |
| Precision Bias Network | Reference Voltage Generator |
Use Scenario: Supplies bias voltage to op-amp input stages in industrial sensor signal conditioning modules. IC Role / Device Role / Timing Role: Low-drift DC reference source for analog front-end calibration. Use Value: Maintains ±3.8 mV/°C drift over −40°C to +85°C, enabling <0.5% total error in 12-bit ADC systems. | Use Scenario: Forms part of a dual-Zener reference stack generating stable mid-rail voltage in single-supply data acquisition systems. IC Role / Device Role / Timing Role: One half of complementary reference pair defining VREF/2 node. Use Value: Provides matched TC and tight VZ tolerance to minimize common-mode offset drift in differential amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | Same 24 V nominal rating, 5% tolerance, but 1 W power rating and DO-41 package | Higher power handling suits higher-current clamping; larger footprint requires layout change | Select when >500 mW dissipation is required or existing DO-41 footprint is fixed |
| MMSZ5249B | 24 V, 5% tolerance, SOD-123 surface-mount package, 500 mW rating, 70 Ω ZZ | Enables compact PCB layouts and reflow assembly; lacks axial lead mechanical robustness | Select for space-constrained or automated SMT production where DO-35 is impractical |
Compared with 1N4749A and MMSZ5249B, the BZX79C24 offers identical electrical regulation performance in a legacy-compatible DO-35 through-hole package, making it optimal for repair, prototyping, and industrial control boards where axial mounting and proven field reliability are prioritized.
Availability
BZX79C24 is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and precision biasing applications requiring stable component supply across industrial, instrumentation, and embedded control markets.
Supply support for BZX79C24 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX79C series was developed for general-purpose voltage regulation and reference functions in cost-sensitive, high-reliability applications where DO-35 packaging and glass passivation deliver long-term stability.
FAQ
What is the zener voltage range of the BZX79C24?
The BZX79C24 has a guaranteed zener voltage range of 22.8 V to 25.6 V when tested at IZ = 5 mA and TA = 25°C. This 5% tolerance window reflects the device's specification per ON Semiconductor's BZX79C2V4–BZX79C56 family datasheet Rev. 3. The BZX79C24 maintains this range across its qualified operating temperature span, supporting predictable regulation in production designs.
What is the maximum power dissipation for the BZX79C24?
The BZX79C24 is rated for 500 mW maximum 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 is defined in the Absolute Maximum Ratings table of the official ON Semiconductor datasheet and must be applied in PCB layout and heatsinking decisions for reliable long-term operation of the BZX79C24.
Does the BZX79C24 have a specified dynamic impedance?
Yes, the BZX79C24 has a maximum dynamic impedance (ZZ) of 70 Ω, measured at IZ = 5 mA and TA = 25°C. This parameter directly affects regulation accuracy under varying load conditions and is documented in the Electrical Characteristics table of the ON Semiconductor BZX79C2V4–BZX79C56 datasheet. Lower ZZ values indicate tighter voltage control, and the BZX79C24's 70 Ω value supports stable performance in feedback and reference roles.
What is the leakage current specification for the BZX79C24?
The BZX79C24 specifies a maximum leakage current (IR) of 0.05 μA at reverse voltage (VR) = 16.8 V and TA = 25°C. This ultra-low leakage ensures minimal current draw in standby or high-impedance bias networks, preserving battery life and reducing measurement errors in precision analog circuits. The value is confirmed in the Electrical Characteristics table of the official ON Semiconductor datasheet for the BZX79C24.
What package type does the BZX79C24 use?
The BZX79C24 uses the DO-35 glass axial-leaded package, with cathode identified by a color band. This JEDEC-standard package provides mechanical robustness, thermal reliability, and compatibility with legacy through-hole assembly processes. The DO-35 outline and marking convention-including "9C" second-line code and "24" third-line voltage designation-are fully documented in the ON Semiconductor BZX79C2V4–BZX79C56 datasheet.
BZX79C24 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- 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-204AH (DO-35)
BZX79C24 FAQ
1.How can I place an order for BZX79C24 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C24 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 reliable?
The price and inventory of BZX79C24 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C24 is usually 5 days.
3.What payment methods are accepted for BZX79C24?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C24 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C24?
BZX79C24 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C24 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?
For technical support, including BZX79C24 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C24 requirements.
6.How does Aetrix verify that BZX79C24 is sourced from the original manufacturer or authorized distributors?
All BZX79C24 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 meets industry standards.
7.What is the process for return or replacement of BZX79C24?
All BZX79C24 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C24, 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 part is unused and in its original packaging.
Return procedure for BZX79C24:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79C24 Tags
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