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Nexperia USA Inc. BZX79-C24,143
- Part No.:
- BZX79-C24,143
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-C24,143.pdf
- Description:
- DIODE ZENER 24V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:892
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Product details
Overview
BZX79-C24,143 from Nexperia is a ±5% tolerance Zener voltage regulator diode in a hermetically sealed SOD27 (DO-35) glass package, rated for 24 V nominal working voltage at 5 mA test current, 500 mW total power dissipation at 50 °C ambient, and 55 Ω typical differential resistance. It serves as a low-power voltage reference in linear power supply feedback paths and precision bias networks.
For engineers reviewing the BZX79-C24,143 datasheet, BZX79-C24,143 pinout, BZX79-C24,143 application, or BZX79-C24,143 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (380 K/W), non-repetitive peak reverse power (40 W), and cathode-marked axial lead configuration for unambiguous PCB orientation.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable DC voltage under varying load and temperature conditions. Its 24 V nominal Zener voltage is specified at IZtest = 5 mA with ±5% tolerance, and exhibits a positive temperature coefficient of +15.9 to +22.0 mV/K across that current range.
The device uses a hermetically sealed glass axial package (SOD27/DO-35) with cathode indicated by a band, enabling reliable operation up to 200 °C junction temperature. Thermal resistance from junction to ambient is 380 K/W under standard mounting conditions (unmetallized PCB, max 8 mm lead length).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V to 25.6 V at IZ = 5 mA - defines stable regulation window for feedback sensing |
| Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C - sets maximum continuous DC power handling on standard PCB |
| Differential Resistance (rdif) | 60 Ω (min), 250 Ω (max) at IZ = 5 mA - determines output impedance and load regulation error |
| Reverse Current (IR) | 50 nA max at VR = 0.7 × VZnom - ensures minimal leakage in high-impedance reference nodes |
| Non-repetitive Peak Power (PZSM) | 40 W for 100 μs square wave - supports transient overvoltage clamping without failure |
| Thermal Resistance (Rth j-a) | 380 K/W - defines junction-to-ambient temperature rise per watt under standard mounting |
Pinout & Package
Hermetically sealed axial-leaded glass package (SOD27 / DO-35), 2-terminal device with cathode identified by a colored band. Leads are tinned copper-clad steel; body diameter 1.85 mm, length 4.25 mm, lead spacing 25.4 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in reverse-biased Zener mode | Connected to lower potential node when used as shunt regulator; carries forward current during polarity reversal |
| Cathode | Zener breakdown terminal / reference output node | Marked with band; connected to regulated voltage node; sinks current to maintain VZ under load variation |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables cost-optimized voltage referencing where tight regulation is not required, e.g., non-critical biasing |
| 500 mW power rating at 50 °C | Supports continuous operation in compact linear regulators without forced cooling or derating below 50 °C ambient |
| Hermetic glass SOD27 package | Provides long-term stability and moisture resistance for industrial environments with >20-year shelf life |
| Low leakage (50 nA max) | Minimizes error in high-impedance voltage divider networks and battery-powered reference circuits |
Applications
| Linear Power Supply Feedback | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Stabilizing output voltage in 24 V AC/DC wall adapters using TL431-based feedback loop. IC Role / Device Role / Timing Role: Zener diode provides precise 24 V reference to comparator input, enabling accurate output regulation. Use Value: ±5% tolerance allows robust operation across component aging and temperature drift while maintaining ±3% output accuracy. | Use Scenario: Generating clean reset signal for STM32F4 microcontrollers during brown-out conditions. IC Role / Device Role / Timing Role: Shunt regulator holds reset line at 24 V until main rail stabilizes, then releases reset via external transistor. Use Value: 50 nA max reverse leakage prevents false triggering in high-impedance reset networks. |
| Industrial Sensor Biasing | Overvoltage Protection Clamp |
Use Scenario: Providing stable excitation voltage to 4–20 mA current-loop pressure transmitters. IC Role / Device Role / Timing Role: Zener diode acts as passive voltage reference for op-amp bias network driving sensor bridge. Use Value: 60–250 Ω differential resistance ensures <0.5% regulation error across 1–10 mA load variation. | Use Scenario: Clamping 24 V CAN bus lines against ESD transients in automotive body control modules. IC Role / Device Role / Timing Role: Fast-acting shunt clamp diverts surge energy before downstream transceiver damage occurs. Use Value: 40 W non-repetitive peak power rating absorbs IEC 61000-4-2 Level 4 (15 kV air) surges without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX79-B24,113 | ±2% tolerance, 23.5–24.5 V range at 5 mA, lower rdif (60–150 Ω) | Higher precision needed for feedback loops requiring <1% output error | Select when tighter voltage stability outweighs cost sensitivity |
| 1N4749A | 24 V nominal, ±5%, but TO-92 plastic package, higher Rth j-a (500 K/W), no hermetic seal | Less demanding environmental reliability requirements; consumer-grade applications | Select for cost-sensitive, non-industrial designs with adequate board-level moisture protection |
Compared with BZX79-B24,113, the BZX79-C24,143 trades voltage precision for lower unit cost and broader tolerance margin; compared with 1N4749A, it offers superior long-term stability and thermal performance due to hermetic glass construction and lower thermal resistance.
Availability
BZX79-C24,143 is available at Aetrix Electronics and suitable for linear power supplies, microcontroller reset circuits, industrial sensor biasing, and overvoltage protection clamps requiring stable component supply and long-lifecycle support.
Supply support for BZX79-C24,143 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
Nexperia is a global leader in discrete, logic, and PowerMOS semiconductors, serving automotive, industrial, computing, and consumer markets with high-reliability components.
The BZX79 series belongs to Nexperia's legacy Zener diode product line, engineered for low-power voltage regulation and reference applications where stability, hermetic sealing, and standardized E24 voltage values are critical.
FAQ
What is the maximum continuous power dissipation for BZX79-C24,143 at 70 °C ambient?
The datasheet specifies 400 mW at Tamb = 50 °C (note 1). Derating follows linear rule: 500 mW − ((70 − 50) × 1.33 mW/°C) = 473 mW. However, absolute maximum rating remains 500 mW only at ≤50 °C; above that, use 400 mW limit per note 1.
Does BZX79-C24,143 have a defined cathode marking, and how is it oriented on PCB?
Yes - the cathode is marked by a distinct color band near one end of the glass body. During PCB layout, the banded end must connect to the higher-potential node (e.g., regulated output rail), while the anode connects to ground or lower-voltage reference.
Can BZX79-C24,143 be used in place of a 24 V Zener in a 100 kHz switching regulator feedback path?
No - its 55 pF typical junction capacitance and 60–250 Ω dynamic impedance cause phase shift and instability in high-frequency feedback loops. It is intended for DC or low-frequency (<1 kHz) regulation; use low-capacitance Zeners like BZX84-C24 for switch-mode applications.
What is the guaranteed reverse leakage current at 18 V reverse bias and 125 °C junction temperature?
The datasheet specifies IR ≤ 50 nA at VR = 0.7 × VZnom = 16.8 V and Tj = 25 °C. At 125 °C, leakage increases exponentially; typical data shows ~200 nA at 18 V and 125 °C, but no guaranteed max is provided beyond 25 °C.
BZX79-C24,143 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 16.8 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ALF2
BZX79-C24,143 FAQ
1.How can I place an order for BZX79-C24,143 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-C24,143 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 BZX79-C24,143 reliable?
The price and inventory of BZX79-C24,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-C24,143 is usually 5 days.
3.What payment methods are accepted for BZX79-C24,143?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-C24,143 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-C24,143?
BZX79-C24,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-C24,143 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 BZX79-C24,143?
For technical support, including BZX79-C24,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-C24,143 requirements.
6.How does Aetrix verify that BZX79-C24,143 is sourced from the original manufacturer or authorized distributors?
All BZX79-C24,143 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 BZX79-C24,143 meets industry standards.
7.What is the process for return or replacement of BZX79-C24,143?
All BZX79-C24,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-C24,143, 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 BZX79-C24,143 part is unused and in its original packaging.
Return procedure for BZX79-C24,143:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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