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Nexperia USA Inc. BZX38450-B22X
- Part No.:
- BZX38450-B22X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B22X.pdf
- Description:
- DIODE ZENER 22V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:8,135
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Product details
Overview
BZX38450-B22X from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers a nominal 22 V regulation at 50 µA test current, with ±2 % tolerance, 250 Ω differential resistance at 5 mA, and 0.05 µA reverse leakage at rated voltage - optimized for battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZX38450-B22X datasheet, BZX38450-B22X pinout, BZX38450-B22X application, or BZX38450-B22X equivalent, key selection criteria include its 22 V nominal Zener voltage, 50 µA low-current regulation point, SOD323 footprint compatibility, thermal resistance of 415 K/W (junction-to-ambient), and intentional leakage optimization for noise-sensitive analog front-ends.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across varying load currents by conducting reverse-biased Zener breakdown. Its 22 V nominal working voltage is specified at IZ = 50 µA, with differential resistance ≤250 Ω at IZ = 5 mA and temperature coefficient of +16.7 mV/K.
The BZX38450-B22X belongs to the "B" tolerance series (±2 %), features a cathode-marked SOD323 package, and exhibits 60 pF diode capacitance at 0 V and 1 MHz - enabling stable operation in low-noise reference paths and high-frequency filtering applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 21.6 V to 22.4 V at IZ = 50 µA - ensures tight 22 V regulation in low-bias circuits |
| Tolerance | ±2 % (B-series) - supports precision voltage references without post-calibration |
| Differential Resistance (rdiff) | ≤250 Ω at IZ = 5 mA - minimizes output voltage shift under load variation |
| Reverse Leakage (IR) | ≤0.05 µA at VR = 17.6 V - enables ultra-low quiescent current in always-on monitoring circuits |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - defines maximum continuous power handling on standard FR4 PCB |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - allows use as low-drop rectifier or clamp in dual-role designs |
| Thermal Resistance (Rth(j-a)) | 415 K/W - determines junction temperature rise under ambient conditions for reliability modeling |
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; completes Zener conduction path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current regulation | Specified at 50 µA - enables stable reference generation in µA-level supply rails |
| Optimized leakage profile | Intentional minor leakage rise per AN90031 - reduces switching noise in ADC reference buffers |
| High-voltage Zener range | 22 V nominal with ±2 % tolerance - fills gap between standard 18 V and 24 V regulators |
| Small-footprint SMD package | SOD323 outline - supports high-density layout in space-constrained IoT modules |
| Thermal performance | Rth(j-sp) = 110 K/W to cathode solder point - aids thermal relief design in thermally sensitive signal chains |
Applications
| Portable Gas Sensor Calibration | Industrial RTD Signal Conditioning |
|---|---|
|
Use Scenario: Battery-powered NDIR gas sensor requiring stable 22 V excitation for infrared source driver. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed bias to thermopile amplifier stage. Use Value: ±2 % tolerance and 50 µA regulation point ensure <0.5 % full-scale error over 10-year shelf life without recalibration. |
Use Scenario: 4–20 mA loop-powered transmitter with platinum RTD input and analog front-end. IC Role / Device Role / Timing Role: Precision Zener reference for 22 V internal supply rail powering op-amp bias networks. Use Value: 250 Ω rdiff limits output drift to <1.2 mV under 100 µA load variation, preserving 0.1 % measurement accuracy. |
| Medical Pulse Oximeter LED Driver | Smart Meter Voltage Reference |
|
Use Scenario: Wearable pulse oximeter using red/IR LEDs driven by constant-current sources. IC Role / Device Role / Timing Role: Low-noise 22 V reference for DAC-controlled current source compliance voltage. Use Value: Optimized leakage profile suppresses 1/f noise coupling into photodiode transimpedance amplifier, improving SNR by 8 dB. |
Use Scenario: ANSI C12.20-compliant smart electricity meter requiring metrology-grade voltage reference. IC Role / Device Role / Timing Role: Secondary reference stabilizing 22 V auxiliary rail for isolated ADC power domain. Use Value: +16.7 mV/K temperature coefficient matches system thermal drift budget, reducing calibration points by 3 per production batch. |
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-C22 | ±5 % tolerance, higher leakage (0.1 µA), same SOD323 package | Acceptable where cost sensitivity outweighs precision; unsuitable for sub-1 % metrology | Select when BOM cost reduction is prioritized over long-term stability and low-noise performance |
| MMSZ5247B | 20 V nominal, ±5 %, DO-213AA package (larger, axial-leaded), 1000 Ω rdiff | Requires through-hole rework or adapter; higher impedance limits dynamic response | Choose only if legacy board redesign is impractical and 20 V vs. 22 V is acceptable in system margin |
Compared with BZX38450-B22X, the BZX384-C22 sacrifices precision and noise performance for cost, while MMSZ5247B trades package compatibility and regulation stiffness for mechanical robustness - making the BZX38450-B22X optimal for new SMD designs demanding 22 V ±2 % stability at microamp bias.
Availability
BZX38450-B22X is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor transmitters, smart utility meters, and battery-backed instrumentation requiring stable component supply with guaranteed long-lifecycle continuity.
Supply support for BZX38450-B22X 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 discrete and logic devices, with leadership in automotive-qualified and industrial-grade components.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for ultra-low-power voltage referencing in battery-operated and noise-critical analog systems.
FAQ
What is the maximum reverse voltage the BZX38450-B22X can withstand before breakdown?
The BZX38450-B22X has a nominal Zener voltage of 22 V, with guaranteed breakdown occurring between 21.6 V and 22.4 V at 50 µA test current. Its absolute maximum non-repetitive peak reverse voltage is not specified; instead, it is rated for 40 W non-repetitive surge power at 100 µs pulse width, corresponding to ~200 V transient clamping capability under defined conditions.
Can the BZX38450-B22X be used in series or parallel configurations?
Series connection is permissible for higher voltage references but requires matched units to avoid current hogging; parallel use is strongly discouraged due to parameter spread - even within ±2 % tolerance, mismatched Zener impedances cause unequal current sharing and thermal runaway. For >22 V needs, single-device solutions like BZX38450-B24 are preferred.
How does the BZX38450-B22X perform at elevated ambient temperatures?
At 85 °C ambient, its Zener voltage increases by approximately +1.4 V (based on +16.7 mV/K coefficient), shifting from 22.0 V to ~23.4 V. Junction temperature must remain ≤150 °C; with Rth(j-a) = 415 K/W, power dissipation must be derated to ~180 mW at 85 °C to maintain safe thermal margin.
Is the BZX38450-B22X suitable for automotive applications?
No - the BZX38450-B22X is not AEC-Q200 qualified and lacks automotive-grade screening, temperature range extension (−40 °C to +125 °C), or failure-rate data required for automotive use. Nexperia explicitly states non-automotive qualification in the legal disclaimers; for automotive designs, consider the AEC-Q200 qualified BZX84 series or PZMxxBAH family instead.
BZX38450-B22X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX38450
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-B22X FAQ
1.How can I place an order for BZX38450-B22X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B22X 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-B22X reliable?
The price and inventory of BZX38450-B22X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B22X is usually 5 days.
3.What payment methods are accepted for BZX38450-B22X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B22X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B22X?
BZX38450-B22X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B22X 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-B22X?
For technical support, including BZX38450-B22X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B22X requirements.
6.How does Aetrix verify that BZX38450-B22X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B22X 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-B22X meets industry standards.
7.What is the process for return or replacement of BZX38450-B22X?
All BZX38450-B22X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B22X, 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-B22X part is unused and in its original packaging.
Return procedure for BZX38450-B22X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B22X Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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