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Nexperia USA Inc. BZX38450-B43-QX
- Part No.:
- BZX38450-B43-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B43-QX.pdf
- Description:
- DIODE ZENER 43V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,531
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Product details
Overview
BZX38450-B43-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 43 V nominal working voltage 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-B43-QX datasheet, BZX38450-B43-QX pinout, BZX38450-B43-QX application, or BZX38450-B43-QX equivalent, this device serves as a precision, low-bias voltage reference in battery-powered sensor interfaces, ECU voltage monitoring circuits, and automotive infotainment power rail clamping.
Technical Context
This Zener diode operates in reverse breakdown with specified VZ = 42.1–43.9 V at IZ = 50 µA, exhibiting a temperature coefficient of +0.05 mV/K and differential resistance of 375 Ω at IZ = 0.5 mA. Its low leakage current and intentional fast-switching optimization support stable regulation under light-load conditions.
Designed for automotive-grade reliability, it features junction-to-ambient thermal resistance of 415 K/W on FR4 PCB and withstands non-repetitive peak reverse power up to 40 W (100 µs pulse), with maximum forward voltage of 0.9 V at 10 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 43 V at IZ = 50 µA - defines precise regulation point for low-power bias networks |
| Voltage Tolerance | ±2 % - ensures tight output stability across production lots and temperature |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C - supports continuous operation in compact SOD323 footprint without forced cooling |
| Differential Resistance | 375 Ω at IZ = 0.5 mA - determines load regulation sensitivity and ripple rejection capability |
| Forward Voltage | 0.9 V at IF = 10 mA - enables predictable conduction behavior during transient overvoltage events |
| Junction Temperature | 150 °C max - allows operation in under-hood automotive environments |
| AEC-Q101 Qualified | Yes - validated for automotive electronics per stress test qualification standard |
Pinout & Package
Package: SOD323 (SC-76), surface-mounted plastic package; 2 leads; 1.3 mm pitch; 1.7 mm × 1.25 mm × 0.95 mm body; cathode indicated by marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity marker determines correct orientation in reverse-bias configuration |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes Zener conduction path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - minimizes quiescent current draw in battery-critical systems |
| Optimized leakage profile | Intentional minor rise in IR - improves switching speed and reduces noise in dynamic regulation |
| Automotive qualification | AEC-Q101 compliant - meets stress test requirements for automotive discrete semiconductors |
| Thermal performance | Rth(j-a) = 415 K/W - enables reliable operation on standard FR4 PCB without heatsinking |
| Small-form-factor packaging | SOD323 footprint - supports high-density layout in space-constrained modules like ADAS sensors |
Applications
| Automotive ECU Voltage Monitoring | Portable Gas Sensor Biasing |
|---|---|
Use Scenario: Real-time monitoring of 5 V or 12 V supply rails in engine control units to detect undervoltage/overvoltage faults. IC Role / Device Role / Timing Role: Zener reference element providing stable threshold for comparator input or ADC reference scaling. Use Value: ±2 % tolerance and AEC-Q101 qualification ensure fault detection accuracy and long-term reliability in harsh under-hood environments. |
Use Scenario: Providing precise bias voltage to electrochemical gas sensing elements in handheld air quality monitors. IC Role / Device Role / Timing Role: Low-current voltage reference enabling consistent sensor excitation independent of battery discharge state. Use Value: 50 µA test current specification and 300 mW power rating allow stable operation across 2.5–4.2 V Li-ion battery range with minimal self-heating. |
| Infotainment System Power Rail Clamping | Industrial IoT Node Reference Stabilization |
Use Scenario: Transient suppression and voltage clamping on 3.3 V or 5 V power rails feeding audio codecs and display drivers. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as shunt clamp to absorb short-duration surges and maintain rail integrity. Use Value: 40 W non-repetitive peak power rating (100 µs) and 0.9 V forward voltage enable robust protection without crowbar circuitry. |
Use Scenario: Stabilizing reference voltage for ultra-low-power microcontroller ADCs in battery-operated predictive maintenance sensors. IC Role / Device Role / Timing Role: Precision Zener source delivering stable 43 V intermediate reference for internal LDO feedback or isolation barrier biasing. Use Value: +0.05 mV/K temperature coefficient and 375 Ω dynamic impedance minimize drift-induced measurement error over −40 to +125 °C industrial range. |
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-C43-Q | ±5 % tolerance, higher leakage current optimized for faster switching | Preferred where tighter voltage accuracy is less critical than noise reduction in high-frequency sensing | Select when system tolerates wider regulation band but requires lower EMI in signal chain front-ends |
| MMSZ43ET1G | Same 43 V nominal, ±5 % tolerance, SOD-123 package, 500 mW Ptot | Higher power handling suits higher-current biasing; larger footprint limits board density | Choose for non-automotive industrial designs needing marginally higher dissipation and legacy footprint compatibility |
Compared with BZX38450-B43-QX, the BZX384-C43-Q trades voltage precision for improved noise performance, while MMSZ43ET1G offers greater power headroom at the cost of AEC-Q101 compliance and SOD323 miniaturization.
Availability
BZX38450-B43-QX is available at Aetrix Electronics and suitable for automotive ECU monitoring, portable sensor biasing, and infotainment power rail clamping requiring stable component supply across extended temperature ranges and lifecycle continuity.
Supply support for BZX38450-B43-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 logic, analog, and discrete components, with leadership in automotive-qualified parts.
The BZX38450-Q series belongs to Nexperia's automotive-grade Zener diode product line, engineered specifically for low-current, high-stability voltage regulation in safety-critical and battery-sensitive vehicle subsystems.
FAQ
What is the exact Zener voltage range for BZX38450-B43-QX at 50 µA?
The confirmed Zener voltage range is 42.1 V to 43.9 V at IZ = 50 µA and Tj = 25 °C, per Table 9 of the Rev. 4 datasheet. This ±2 % tolerance is guaranteed across the full operating temperature range of −55 °C to +150 °C ambient.
Is BZX38450-B43-QX suitable for reverse-voltage protection circuits?
No - this device is a Zener regulator diode, not a TVS or dedicated protection diode. It lacks specified clamping voltage, surge current rating, or response time for transient suppression. Use only in shunt regulation or reference applications per its characterized electrical parameters.
How does the SOD323 package affect thermal performance in PCB layout?
When mounted on standard FR4 with single-sided copper, the SOD323 package delivers Rth(j-a) = 415 K/W and Rth(j-sp) = 110 K/W (to cathode solder point). Thermal relief pads and copper pour under the cathode pad reduce junction temperature by up to 25 °C at 300 mW dissipation.
Does BZX38450-B43-QX require external series resistance in typical applications?
Yes - a current-limiting resistor is mandatory to set IZ within 50 µA to 5 mA range and prevent thermal runaway. For 5 V input and 43 V Zener, minimum R = (5 V − 43 V)/IZ is invalid; this part is intended for use with input voltages >43 V, e.g., 48 V automotive systems with appropriate series resistance.
BZX38450-B43-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):
- 43 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.6 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-B43-QX FAQ
1.How can I place an order for BZX38450-B43-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B43-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-B43-QX reliable?
The price and inventory of BZX38450-B43-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-B43-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B43-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B43-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B43-QX?
BZX38450-B43-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B43-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-B43-QX?
For technical support, including BZX38450-B43-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B43-QX requirements.
6.How does Aetrix verify that BZX38450-B43-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B43-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-B43-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B43-QX?
All BZX38450-B43-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B43-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-B43-QX part is unused and in its original packaging.
Return procedure for BZX38450-B43-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B43-QX Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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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
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SMAZ12-13-F
Diodes Incorporated
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