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Nexperia USA Inc. BZX38450-B9V1-QX
- Part No.:
- BZX38450-B9V1-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B9V1-QX.pdf
- Description:
- DIODE ZENER 9.1V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,199
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Product details
Overview
BZX38450-B9V1-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 9.1 V nominal regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX38450-B9V1-QX datasheet, BZX38450-B9V1-QX pinout, BZX38450-B9V1-QX application, or BZX38450-B9V1-QX equivalent, this device is selected for precision low-bias voltage reference, ESD-protected signal clamping, and battery-powered sensor biasing where leakage and thermal stability are critical.
Technical Context
This Zener diode operates in reverse breakdown with a specified working voltage of 8.92 V to 9.28 V at IZ = 50 µA, exhibiting a temperature coefficient of +3.8 mV/K and differential resistance of ≤100 Ω at IZ = 5 mA. Its low 50 µA test current enables stable regulation in ultra-low-power circuits.
The device features intentional minor leakage current optimization per AN90031 for fast switching and noise reduction, and achieves 150 °C maximum junction temperature with Rth(j-a) = 415 K/W on FR4 PCB - enabling reliable operation in compact automotive ECUs and portable instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 9.1 V at IZ = 50 µA - defines precise regulation point for low-current reference circuits |
| Voltage Tolerance | ±2 % - ensures tight output stability across production lots without calibration |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C - supports continuous operation in thermally constrained SMT layouts |
| Forward Voltage | ≤ 0.9 V at IF = 10 mA - enables predictable forward conduction for bidirectional protection schemes |
| Junction Temperature | −55 °C to +150 °C - validated for under-hood automotive environments and industrial edge nodes |
| Reverse Leakage | ≤ 0.1 µA at VR = 7.3 V - minimizes quiescent current drain in battery-backed systems |
| AEC-Q101 Qualified | Yes - certified for automotive-grade reliability 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 clamping |
Key Features
| Feature | Design Value |
|---|---|
| Low Test Current Operation | Specified at 50 µA - enables stable regulation in microamp-level bias networks for IoT sensors |
| Optimized Leakage Profile | Intentional minor IR rise per AN90031 - reduces switching transients and high-frequency noise in ADC reference paths |
| Automotive Qualification | AEC-Q101 compliant - qualified for engine control modules, body electronics, and ADAS subsystems |
| Thermal Performance | Rth(j-sp) = 110 K/W to cathode solder point - supports localized thermal relief in dense PCB layouts |
| Small-Signal Capacitance | 150 pF at VR = 0 V, f = 1 MHz - limits high-frequency loading in RF front-end bias networks |
Applications
| Automotive Sensor Biasing | Portable Medical Instrumentation |
|---|---|
Use Scenario: Providing stable 9.1 V reference to MEMS pressure sensor ICs in brake fluid pressure modules. IC Role / Device Role / Timing Role: Zener voltage regulator establishing precision analog bias point for sensor excitation and ADC reference. Use Value: ±2 % tolerance and +3.8 mV/K TC ensure <±15 mV drift over −40 °C to +125 °C ambient, meeting ASIL-B accuracy requirements. |
Use Scenario: Supplying regulated bias to low-power op-amps in handheld pulse oximeters powered by coin cells. IC Role / Device Role / Timing Role: Low-current Zener shunt regulator maintaining stable headroom for rail-to-rail input stages. Use Value: 50 µA test current and ≤0.1 µA leakage at 7.3 V minimize standby current, extending battery life beyond 12 months. |
| Industrial PLC Analog Input Protection | Wearables Power-Rail Clamping |
Use Scenario: Clamping 0–10 V analog input channels against ESD and overvoltage transients in factory-floor controllers. IC Role / Device Role / Timing Role: Fast-response Zener clamp absorbing 4 kV HBM surges while limiting rail excursion to ≤9.5 V. Use Value: Optimized leakage profile per AN90031 suppresses ringing during transient recovery, preventing false ADC readings. |
Use Scenario: Protecting lithium-polymer battery monitor ICs from voltage spikes during wireless charging in smartwatches. IC Role / Device Role / Timing Role: Bidirectional protection element using forward conduction (≤0.9 V) and reverse Zener action (9.1 V). Use Value: SOD323 footprint and 150 pF capacitance avoid signal integrity degradation on 100 kHz battery telemetry lines. |
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-C9V1-Q | ±5 % tolerance, higher leakage (0.1 µA vs. 0.05 µA at 7.3 V), same 9.1 V nominal | Acceptable for non-critical biasing where cost sensitivity outweighs precision | Select when tighter TC and lower drift are not required and BOM cost reduction is prioritized |
| MMSZ5240B-7-F | Same 10 V nominal (not 9.1 V), ±5 %, 500 mW Ptot, SOD-123 package | Requires layout change; suitable only if 10 V regulation and higher power margin are acceptable | Choose only if system design allows 0.9 V higher regulation voltage and larger footprint can be accommodated |
Compared with BZX38450-B9V1-QX, the BZX384-C9V1-Q trades precision for cost in non-automotive applications, while MMSZ5240B-7-F introduces voltage and package mismatch - making the original part uniquely suited for AEC-Q101-compliant 9.1 V low-leakage regulation.
Availability
BZX38450-B9V1-QX is available at Aetrix Electronics and suitable for automotive sensor biasing, portable medical instrumentation, industrial PLC analog input protection, and wearables power-rail clamping requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BZX38450-B9V1-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 logic, discrete, and MOSFET devices with focus on efficiency, reliability, and miniaturization for automotive, industrial, and mobile markets.
The BZX38450-Q series belongs to Nexperia's AEC-Q101-qualified Zener regulator portfolio, engineered specifically for low-current, high-stability voltage reference and clamping in space-constrained automotive and portable electronics.
FAQ
What is the maximum reverse voltage before breakdown for BZX38450-B9V1-QX?
The device exhibits a nominal Zener voltage of 9.1 V with guaranteed range of 8.92 V to 9.28 V at IZ = 50 µA. Breakdown is sharp and well-defined within this band; operation below 8.92 V remains in high-impedance reverse leakage region (<0.05 µA), while voltages above 9.28 V initiate controlled regulation with rdiff ≤100 Ω.
Can BZX38450-B9V1-QX be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients and parameter spread; paralleling causes current hogging and thermal runaway. The 300 mW rating assumes single-device operation on standard FR4 PCB. For higher power, use a single higher-rated Zener or active regulation instead.
Is the marking code '9D' confirmed for BZX38450-B9V1-QX?
Yes - Table 4 explicitly lists BZX38450-B9V1-Q with marking code '9D'. This two-character code is laser-marked on the cathode side of the SOD323 package and corresponds exclusively to the B-series 9.1 V variant with ±2 % tolerance.
Does BZX38450-B9V1-QX support reflow soldering per JEDEC J-STD-020?
Yes - the SOD323 package is qualified for standard lead-free reflow profiles. Figure 10 provides the recommended solder land pattern, and the device withstands peak temperatures up to 260 °C for ≤40 seconds, consistent with JEDEC Level 1 moisture sensitivity and IPC-A-610 Class 2 acceptability.
BZX38450-B9V1-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):
- 9.1 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 6.9 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-B9V1-QX FAQ
1.How can I place an order for BZX38450-B9V1-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B9V1-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-B9V1-QX reliable?
The price and inventory of BZX38450-B9V1-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-B9V1-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B9V1-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B9V1-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B9V1-QX?
BZX38450-B9V1-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B9V1-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-B9V1-QX?
For technical support, including BZX38450-B9V1-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B9V1-QX requirements.
6.How does Aetrix verify that BZX38450-B9V1-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B9V1-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-B9V1-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B9V1-QX?
All BZX38450-B9V1-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B9V1-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-B9V1-QX part is unused and in its original packaging.
Return procedure for BZX38450-B9V1-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B9V1-QX Tags
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MMSZ4682T1G
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MM5Z5V1ST1G
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