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Nexperia USA Inc. BZX38450-B24-QX
- Part No.:
- BZX38450-B24-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B24-QX.pdf
- Description:
- DIODE ZENER 24V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,186
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Product details
Overview
BZX38450-B24-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 24 V nominal regulation at 50 µA test current, with ±2 % tolerance, 300 mW power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX38450-B24-QX datasheet, BZX38450-B24-QX pinout, BZX38450-B24-QX application, or BZX38450-B24-QX equivalent, this part supports precision low-bias voltage reference, ESD-robust signal clamping, and battery-powered sensor biasing where stable 24 V regulation at microamp-level currents is required.
Technical Context
This Zener diode operates in reverse breakdown with a specified working voltage of 23.5 V to 24.5 V at IZ = 50 µA, exhibiting 250 Ω typical differential resistance at IZ = 5 mA and a temperature coefficient of +18.2 mV/K. Its low 50 µA test current enables ultra-low quiescent current regulation in always-on circuits.
Designed for automotive-grade reliability, it features qualified AEC-Q101 stress testing, junction temperature up to 150 °C, and thermal resistance Rth(j-a) = 415 K/W on FR4 PCB - enabling operation in harsh ambient conditions without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 24 V (min 23.5 V, max 24.5 V at IZ = 50 µA - defines tight regulation window for reference stability) |
| Tolerance | ±2 % (B-series grading - ensures predictable voltage accuracy without post-manufacture trimming) |
| Power Dissipation | 300 mW (max at Tamb ≤ 25 °C on standard FR4 PCB - sets safe continuous operating limit) |
| Test Current | 50 µA (specifies regulation point for low-power biasing - enables use in nanoamp-sleep systems) |
| Forward Voltage | 0.9 V max at IF = 10 mA - defines conduction threshold for bidirectional clamping applications |
| Junction Temperature | 150 °C max - confirms suitability for under-hood automotive environments |
| AEC-Q101 Qualified | Yes - validated for automotive discrete semiconductor stress requirements including HTGB, HTRB, and temperature cycling |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package: 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity marker determines reverse-bias orientation for Zener operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for voltage reference function |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables stable regulation in battery-backed real-time clocks and IoT wake-up circuits |
| Automotive qualification | AEC-Q101 compliant - eliminates need for additional qualification testing in Tier-1 automotive modules |
| Tight voltage tolerance | ±2 % (B-series) - reduces system-level calibration burden in analog front-ends and ADC reference buffers |
| Optimized leakage behavior | Intentional minor IR rise per AN90031 - improves switching speed and reduces noise in transient suppression paths |
| Thermal performance | Rth(j-sp) = 110 K/W to cathode solder point - supports reliable thermal coupling in compact PCB layouts |
Applications
| Automotive Sensor Biasing | Portable Gas Detector Reference |
|---|---|
Use Scenario: Providing stable 24 V bias to MEMS pressure transducers in engine control units. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precise excitation voltage for ratiometric sensor output. Use Value: ±2 % tolerance and AEC-Q101 qualification ensure long-term drift < 0.5 % over 15-year vehicle life at 125 °C ambient. |
Use Scenario: Generating fixed reference for electrochemical gas sensor amplifiers in handheld safety monitors. IC Role / Device Role / Timing Role: Low-current Zener regulator supplying 24 V reference to op-amp bias networks. Use Value: 50 µA test current enables >10-year battery life in lithium-thionyl chloride–powered devices with no load-switching complexity. |
| Industrial PLC Input Protection | Medical Wearable Signal Clamping |
Use Scenario: Clamping 24 V digital input lines against ESD and surge transients in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor leveraging Zener and forward diode characteristics. Use Value: 0.9 V forward voltage and 24 V reverse breakdown provide symmetrical ±24.9 V clamping window with sub-ns response. |
Use Scenario: Protecting analog front-end inputs of ECG/PPG modules from electrode contact spikes. IC Role / Device Role / Timing Role: Low-capacitance (55 pF) Zener clamp limiting signal swing to safe levels for ADC input stages. Use Value: 55 pF capacitance at VR = 0 V avoids high-frequency attenuation in 100 kHz biopotential bandwidths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C24-Q | ±5 % tolerance, higher leakage (0.05 µA vs. B-series' 0.05 µA at same VR), identical package and thermal specs | Acceptable where cost sensitivity outweighs voltage accuracy; not recommended for ratiometric sensor bias | Select when budget constraints dominate and system calibration compensates for wider tolerance |
| MMSZ5245B-7-F | 24 V ±5 %, SOD-123 package (2.7 × 1.6 mm), 500 mW Ptot, non-AEC-Q101 | Larger footprint and higher power rating suit industrial power rails; lacks automotive qualification | Choose for non-automotive 24 V supply monitoring where board space allows larger package |
Compared with BZX38450-B24-QX, the BZX384-C24-Q trades voltage accuracy for cost in identical form factor, while MMSZ5245B-7-F offers higher power handling in a larger package but omits automotive qualification - making the BZX38450-B24-QX optimal for space-constrained, safety-critical 24 V reference designs.
Availability
BZX38450-B24-QX is available at Aetrix Electronics and suitable for automotive sensor modules, portable gas detection systems, industrial PLC input stages, and medical wearable signal conditioning requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BZX38450-B24-QX 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 semiconductor expert focused on high-volume, high-reliability essential semiconductors - delivering discrete, logic, and MOSFET solutions optimized for efficiency, miniaturization, and robustness.
The BZX38450-Q series belongs to Nexperia's automotive-qualified Zener regulator portfolio, engineered specifically for low-current, high-stability voltage reference and clamping in space-constrained, thermally demanding environments.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX38450-B24-QX has a nominal Zener voltage of 24 V, with guaranteed breakdown between 23.5 V and 24.5 V at 50 µA test current. Its absolute maximum non-repetitive peak reverse voltage is not specified separately - operation above 24.5 V risks uncontrolled conduction and thermal runaway unless current-limited to ≤250 mA per limiting values table.
Is this device suitable for use in a 125 °C under-hood automotive environment?
Yes. The device is AEC-Q101 qualified and rated for junction temperatures up to 150 °C. With Rth(j-a) = 415 K/W on FR4 PCB, it sustains continuous operation at 125 °C ambient when power dissipation remains ≤120 mW - verified via thermal modeling in Nexperia's application note AN11120.
How does the "intentional minor rise of leakage current" affect circuit performance?
Per AN90031, the controlled increase in reverse leakage (e.g., 0.05 µA at VR = 24 V) reduces minority-carrier lifetime, yielding faster turn-off during transient suppression and lower broadband noise - critical for precision analog signal chains where conventional Zeners induce switching artifacts.
Can this diode replace a 1N4749A in an existing design?
No - the 1N4749A is a 24 V, 1 W through-hole Zener with ±5 % tolerance and 5 mA test current. BZX38450-B24-QX is a 300 mW, ±2 %, 50 µA SMD device with different thermal and dynamic behavior. Direct substitution requires verifying current-limiting resistor recalculations, PCB layout changes, and validation of low-current regulation stability.
BZX38450-B24-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX38450-Q
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 18.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-B24-QX FAQ
1.How can I place an order for BZX38450-B24-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B24-QX 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 BZX38450-B24-QX reliable?
The price and inventory of BZX38450-B24-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B24-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B24-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B24-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B24-QX?
BZX38450-B24-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B24-QX 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 BZX38450-B24-QX?
For technical support, including BZX38450-B24-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B24-QX requirements.
6.How does Aetrix verify that BZX38450-B24-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B24-QX 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 BZX38450-B24-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B24-QX?
All BZX38450-B24-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B24-QX, 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 BZX38450-B24-QX part is unused and in its original packaging.
Return procedure for BZX38450-B24-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B24-QX Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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