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Nexperia USA Inc. BZX79-B24,143
- Part No.:
- BZX79-B24,143
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B24,143.pdf
- Description:
- DIODE ZENER 24V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:2,140
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Product details
Overview
BZX79-B24,143 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal 24 V breakdown voltage at 5 mA test current, 60 Ω typical differential resistance, and −22 mV/K temperature coefficient at 5 mA. It operates in low-power stabilization circuits requiring stable reference voltages under ambient temperatures up to +150 °C and is housed in a hermetically sealed SOD27 (DO-35) glass package.
For engineers reviewing the BZX79-B24,143 datasheet, BZX79-B24,143 pinout, BZX79-B24,143 application, or BZX79-B24,143 equivalent, this part serves as a precision voltage reference in analog power supply feedback loops, overvoltage protection clamps, and sensor biasing networks where tight tolerance and predictable thermal drift are critical.
Technical Context
This Zener diode functions in reverse-biased breakdown mode, delivering a stable 23.5–24.5 V regulation window at IZ = 5 mA with 60 Ω typical dynamic impedance. Its negative temperature coefficient of −22 mV/K enables predictable drift compensation in multi-diode reference strings.
Designed for operation up to 200 °C junction temperature, it supports non-repetitive surge handling up to 55 A peak reverse current (100 μs pulse) and dissipates up to 500 mW at Tamb = 50 °C with 380 K/W junction-to-ambient thermal resistance on standard PCB mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 24 V at IZ = 5 mA - defines precise DC reference point for feedback or clamp circuits |
| Voltage Tolerance | ±2% - ensures 23.5–24.5 V regulation window for high-accuracy applications |
| Differential Resistance (rdiff) | 60 Ω typical at 5 mA - determines output impedance and load regulation sensitivity |
| Temperature Coefficient (SZ) | −22 mV/K at 5 mA - quantifies voltage drift per degree Celsius for thermal design margining |
| Max Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C - sets continuous thermal limit on standard PCB without heatsink |
| Non-repetitive Peak Reverse Current (IZSM) | 1.25 A at tp = 100 μs - defines single-event surge capability for transient suppression |
| Reverse Leakage (IR) | 50 nA at VR = 16.8 V - confirms low standby current in high-impedance bias networks |
Pinout & Package
Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode indicated by a colored band. Total length 4.25 mm, body diameter 1.85 mm, lead diameter 0.56 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in Zener clamp | Connected to ground or lower potential node when used in shunt regulation |
| Cathode | Reverse breakdown terminal / regulated output node | Marked with band; connects to input rail in shunt configuration to maintain fixed VZ |
Key Features
| Feature | Design Value |
|---|---|
| ±2% voltage tolerance | Enables direct use in precision references without post-calibration trimming |
| Hermetic glass SOD27 package | Ensures long-term stability and moisture resistance in industrial environments |
| 500 mW total power rating | Supports robust operation in 12–24 V system rails with minimal derating |
| −22 mV/K tempco at 5 mA | Allows predictable thermal compensation in multi-diode reference designs |
| Low 50 nA leakage at 70% VZ | Minimizes error in high-impedance sensor bias and battery-monitoring circuits |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
|
Use Scenario: Stabilizing output voltage in linear regulators or switching converter feedback paths. IC Role / Device Role / Timing Role: Shunt-connected Zener providing precise 24 V reference to error amplifier input. Use Value: Tight ±2% tolerance and low 60 Ω dynamic impedance ensure <1% output variation across line/load changes. |
Use Scenario: Protecting microcontroller I/O pins from 24 V bus transients in industrial PLC modules. IC Role / Device Role / Timing Role: Cathode tied to protected node, anode grounded-clamps excursions above 24.5 V. Use Value: 1.25 A non-repetitive surge rating absorbs 100 μs spikes without degradation. |
| Sensor Bias Voltage Source | Temperature-Compensated Reference String |
|
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in HVAC control units. IC Role / Device Role / Timing Role: Low-leakage (50 nA) Zener supplies bias current while minimizing self-heating error. Use Value: Sub-100 nA leakage at 16.8 V ensures <0.1% measurement error in 100 kΩ bridge configurations. |
Use Scenario: Building a 48 V reference using two series-connected BZX79-B24,143 diodes. IC Role / Device Role / Timing Role: Paired devices with matched −22 mV/K tempco cancel thermal drift across operating range. Use Value: Combined tempco remains near zero, enabling <±0.02%/°C stability in precision instrumentation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics BZT52-B24 | Same 24 V ±2%, but SOD-123 package (surface-mount); 400 mW Ptot; 70 Ω rdiff | Requires rework for through-hole PCBs; better suited for automated assembly | Select for space-constrained designs needing RoHS-compliant SMT placement |
| ON Semiconductor MMBZ5249BS | 24 V ±5%, SOT-23 package; 350 mW Ptot; 30 Ω rdiff; 100 nA IR at 16.8 V | Lower accuracy and higher leakage; optimized for cost-sensitive consumer electronics | Select only where ±5% tolerance and surface-mount are acceptable trade-offs |
Compared with BZX79-B24,143, the BZT52-B24 offers identical regulation accuracy in a smaller footprint but reduced power handling, while the MMBZ5249BS sacrifices tolerance and leakage performance for SMT compatibility and lower unit cost-making the original optimal for through-hole, high-stability industrial references.
Availability
BZX79-B24,143 is available at Aetrix Electronics and suitable for industrial power supply feedback, overvoltage protection circuits, and sensor biasing networks requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for BZX79-B24,143 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 semiconductors, formed in 2017 from the former NXP Standard Products division, with focus on automotive, industrial, and computing markets.
BZX79-B24,143 belongs to the BZX79 series of precision Zener diodes designed specifically for low-power voltage regulation and reference applications in harsh-environment electronics.
FAQ
What is the maximum continuous power dissipation for BZX79-B24,143 at 70 °C ambient?
At 70 °C ambient, the device must be derated from its 500 mW rating at 50 °C. Using the 380 K/W junction-to-ambient thermal resistance, the allowable power drops to approximately 368 mW to maintain Tj ≤ 200 °C. This is calculated via P = (Tjmax − Tamb) / Rth j-a.
Can BZX79-B24,143 be used in series for higher voltage references?
Yes-two BZX79-B24,143 diodes in series yield a 48 V reference with matched −22 mV/K temperature coefficients, resulting in near-zero net drift. The combined differential resistance is ~120 Ω, and total power dissipation must remain within 500 mW per device under operating conditions.
Is the cathode marking consistent across all BZX79-B24,143 units?
Yes-the cathode is always marked by a distinct color band on the glass body, per SOD27 package specification. This marking is laser-etched or painted during manufacturing and verified per JEDEC DO-35 standards; no exceptions exist in production lots.
How does reverse leakage compare between BZX79-B24,143 and BZX79-C24?
At VR = 16.8 V (70% of nominal), BZX79-B24,143 specifies 50 nA max, while the ±5% BZX79-C24 variant specifies 100 nA max. The tighter tolerance grade achieves lower leakage due to tighter process control during Zener junction formation.
BZX79-B24,143 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±2%
- 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-B24,143 FAQ
1.How can I place an order for BZX79-B24,143 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B24,143 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-B24,143 reliable?
The price and inventory of BZX79-B24,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B24,143 is usually 5 days.
3.What payment methods are accepted for BZX79-B24,143?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B24,143 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B24,143?
BZX79-B24,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B24,143 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-B24,143?
For technical support, including BZX79-B24,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B24,143 requirements.
6.How does Aetrix verify that BZX79-B24,143 is sourced from the original manufacturer or authorized distributors?
All BZX79-B24,143 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-B24,143 meets industry standards.
7.What is the process for return or replacement of BZX79-B24,143?
All BZX79-B24,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B24,143, 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-B24,143 part is unused and in its original packaging.
Return procedure for BZX79-B24,143:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79-B24,143 Tags
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