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Nexperia USA Inc. BZX38450-B22-QX
- Part No.:
- BZX38450-B22-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B22-QX.pdf
- Description:
- DIODE ZENER 22V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,155
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Product details
Overview
BZX38450-B22-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 22 V nominal working voltage at 50 µA test current, ±2 % tolerance, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive use.
For engineers reviewing the BZX38450-B22-QX datasheet, BZX38450-B22-QX pinout, BZX38450-B22-QX application, or BZX38450-B22-QX equivalent, key selection criteria include low-bias regulation stability, thermal resistance (Rth(j-a) = 415 K/W), cathode-anode polarity marking, and leakage optimization per AN90031 for noise-sensitive portable systems.
Technical Context
This device operates as a two-terminal shunt voltage reference, maintaining stable reverse breakdown at 22 V with differential resistance ≤250 Ω at IZ = 5 mA and temperature coefficient of +16.7 mV/K. It exhibits low forward voltage (≤0.9 V at 10 mA) and specified reverse current ≤0.05 µA at VR = 16.7 V.
Designed for low-power biasing, its 50 µA test current enables operation in ultra-low-quiescent circuits, while intentional minor leakage rise improves switching speed and reduces noise-verified in AN90031 for signal integrity in automotive sensor interfaces and battery management monitoring paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 22 V at IZ = 50 µA - precise regulation point for 24 V rail monitoring and low-power reference generation |
| Tolerance | ±2 % - tight voltage accuracy enabling direct replacement in AEC-Q101-compliant automotive control modules |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C - supports continuous operation on standard FR4 PCB without heatsinking |
| Differential Resistance | ≤250 Ω at IZ = 5 mA - ensures minimal output voltage shift under load variation in feedback networks |
| Junction Temperature | −55 °C to +150 °C - validated for under-hood automotive environments and industrial edge nodes |
| Thermal Resistance | Rth(j-a) = 415 K/W - defines derating curve for ambient temperatures above 25 °C in compact layouts |
| Reverse Current | ≤0.05 µA at VR = 16.7 V - guarantees low standby power in always-on battery-backed circuits |
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; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms shunt path to clamp voltage during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables stable regulation in microamp-level bias networks for IoT sensors and wearables |
| AEC-Q101 qualification | Qualified per Stress Test Qualification for Discrete Semiconductors - approved for automotive powertrain and body electronics |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching transients and high-frequency noise in ADC reference buffers |
| Small-footprint packaging | SOD323 outline with 1.3 mm pitch - supports high-density routing in space-constrained ECUs and portable medical devices |
Applications
| Automotive Sensor Biasing | Portable Battery Monitor Reference |
|---|---|
|
Use Scenario: Providing stable 22 V reference for analog front-end of engine coolant temperature sensor interface in ECU. IC Role / Device Role / Timing Role: Shunt voltage regulator establishing precision bias point for op-amp input stage and ADC reference divider. Use Value: ±2 % tolerance and AEC-Q101 qualification ensure long-term drift stability and functional safety compliance across −40 °C to +125 °C operating range. |
Use Scenario: Regulating reference voltage for fuel gauge IC in lithium-ion powered handheld diagnostic tool. IC Role / Device Role / Timing Role: Low-current Zener element setting threshold for battery voltage detection circuitry. Use Value: 50 µA test current and ≤0.05 µA reverse leakage minimize quiescent drain, extending runtime in sleep mode by >15 % versus standard 5 mA-regulated Zeners. |
| Industrial PLC Input Protection | Medical Wearable Signal Conditioning |
|
Use Scenario: Clamping transient overvoltage on 24 V digital input channel of programmable logic controller. IC Role / Device Role / Timing Role: Fast-response shunt limiter absorbing surge energy before downstream optocoupler or MCU GPIO. Use Value: 40 W non-repetitive peak reverse power (tp = 100 µs) and 250 mA forward current rating enable robust Class III surge immunity per IEC 61000-4-5. |
Use Scenario: Stabilizing excitation voltage for piezoresistive pressure sensor in wireless blood pressure cuff. IC Role / Device Role / Timing Role: Precision voltage source for ratiometric sensor bridge excitation in ultra-low-power wearable SoC subsystem. Use Value: Optimized leakage behavior per AN90031 suppresses 1/f noise in sensor signal chain, improving SNR by ≥8 dB versus conventional Zeners. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C22-Q | ±5 % tolerance, higher leakage (0.1 µA at VR = 16.7 V), same SOD323 package | Acceptable where cost sensitivity outweighs precision; not recommended for AEC-Q101-critical functions | Select when budget constraints dominate and ±5 % regulation error is acceptable in non-safety-critical consumer modules |
| MMSZ5247B-TP | 22 V nominal, ±5 %, 500 mW Ptot, SOD-123 package (larger footprint, Rth(j-a) = 350 K/W) | Higher power handling but incompatible pin pitch and thermal profile; requires PCB redesign | Choose only if legacy board reuse mandates SOD-123 or if 500 mW dissipation is mandatory for sustained overload conditions |
Compared with BZX38450-B22-QX, the BZX384-C22-Q trades precision and leakage performance for cost, while MMSZ5247B-TP offers higher power but sacrifices automotive qualification and board-space efficiency-making the BZX38450-B22-QX optimal for new AEC-Q101 designs requiring compact, low-noise 22 V regulation.
Availability
BZX38450-B22-QX is available at Aetrix Electronics and suitable for automotive ECU design, portable medical instrumentation, industrial PLC input protection, and battery-powered sensor nodes requiring stable component supply with full traceability and lifecycle continuity.
Supply support for BZX38450-B22-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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and automotive-grade reliability.
The BZX38450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, low-noise voltage regulation in automotive and portable electronics where precision, size, and thermal efficiency are critical.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX38450-B22-QX has a nominal Zener voltage of 22 V at 50 µA test current, with guaranteed minimum and maximum values of 21.6 V and 22.4 V respectively. Its absolute maximum non-repetitive peak reverse voltage is defined by the 40 W surge rating at 100 µs pulse width, not a fixed DC limit.
Does this part require external current limiting in series?
Yes - like all Zener diodes, BZX38450-B22-QX must be used with a series current-limiting resistor to prevent exceeding its 300 mW total power dissipation limit. The resistor value is calculated based on supply voltage, desired Zener current (e.g., 50 µA to 5 mA), and the diode's dynamic impedance.
How does the "B" suffix differ from "C" in the BZX38450-Q series?
The "B" suffix denotes ±2 % tolerance on nominal Zener voltage, while "C" indicates approximately ±5 % tolerance. Both share identical SOD323 packaging, thermal characteristics, and AEC-Q101 qualification, but "B" grade delivers tighter regulation for precision analog circuits.
Can this diode be used in place of a standard 1N4742A?
No - although both regulate at 22 V, the BZX38450-B22-QX is a low-current device (rated at 50 µA test current, 300 mW Ptot) in SOD323 package, whereas the 1N4742A is a 1 W through-hole Zener. Substitution would cause thermal overstress and incorrect biasing unless circuit current and layout are fully revalidated.
BZX38450-B22-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):
- 22 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 16.7 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-B22-QX FAQ
1.How can I place an order for BZX38450-B22-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B22-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-B22-QX reliable?
The price and inventory of BZX38450-B22-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-B22-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B22-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B22-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B22-QX?
BZX38450-B22-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B22-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-B22-QX?
For technical support, including BZX38450-B22-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B22-QX requirements.
6.How does Aetrix verify that BZX38450-B22-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B22-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-B22-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B22-QX?
All BZX38450-B22-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B22-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-B22-QX part is unused and in its original packaging.
Return procedure for BZX38450-B22-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B22-QX Tags
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MMBZ5240B-7-F
Diodes Incorporated
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Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
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