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Nexperia USA Inc. BZX38450-B4V7-QX
- Part No.:
- BZX38450-B4V7-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B4V7-QX.pdf
- Description:
- DIODE ZENER 4.7V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,459
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Product details
Overview
BZX38450-B4V7-Q from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 4.7 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-B4V7-Q datasheet, BZX38450-B4V7-Q pinout, BZX38450-B4V7-Q application, or BZX38450-B4V7-Q equivalent, this device is selected for precision low-bias voltage reference, battery-powered sensor biasing, and automotive ECU voltage clamping where stable 4.7 V regulation at microamp-level currents is required.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 4.61 V to 4.79 V at IZ = 50 µA, exhibiting a temperature coefficient of −2.7 mV/K and differential resistance of ≤80 Ω at IZ = 5 mA. Its low 50 µA test current enables operation in ultra-low-power circuits without compromising regulation accuracy.
Designed for automotive-grade reliability, it supports junction temperatures up to 150 °C and meets AEC-Q101 stress testing requirements. The SOD323 package delivers thermal resistance of 110 K/W (junction-to-solder point), enabling stable performance under transient thermal loads in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 4.7 V (min 4.61 V, max 4.79 V at IZ = 50 µA); defines precise clamping/reference level in low-current bias networks |
| Tolerance | ±2 % (B-series); ensures tight voltage matching across production lots for calibrated analog circuits |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C; sets maximum continuous steady-state power handling on standard FR4 PCB |
| Forward Voltage | ≤0.9 V at IF = 10 mA; guarantees low conduction loss when used in forward-biased protection paths |
| Differential Resistance | ≤80 Ω at IZ = 5 mA; determines regulation stiffness-lower rdiff yields smaller output voltage variation under load changes |
| Reverse Leakage | ≤5.0 µA at VR = 3.0 V; critical for standby current budget in battery-critical applications like keyless entry modules |
| Thermal Resistance (j-sp) | 110 K/W; quantifies thermal path efficiency from junction to cathode solder point-enables accurate thermal design in dense automotive layouts |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package: 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, single-sided copper FR4 mounting. Cathode identified by marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity-sensitive terminal-reverse-biased during Zener operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes bias path for controlled breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA-enables stable regulation in micropower sensor interfaces and always-on automotive modules |
| AEC-Q101 qualification | Qualified for automotive applications-validates robustness against temperature cycling, humidity, and mechanical shock per industry standard |
| Controlled leakage optimization | B-series devices feature intentional minor leakage rise to reduce switching noise and improve transient response in feedback paths |
| Tight voltage tolerance | ±2 % tolerance band-reduces need for post-assembly calibration in precision reference designs |
| Compact SMD footprint | SOD323 package saves >60 % board area vs. DO-35; compatible with high-speed automated placement and reflow |
Applications
| Automotive Body Control Module (BCM) | Portable Medical Sensor Biasing |
|---|---|
Use Scenario: Voltage clamping for LIN bus transceiver input protection in door module ECUs. IC Role / Device Role / Timing Role: Zener clamp limiting transient overvoltage to protect 5 V logic inputs during load dump events. Use Value: With 4.7 V nominal rating and AEC-Q101 qualification, provides certified surge immunity without external TVS cascading. |
Use Scenario: Stable bias voltage generation for low-power analog front-end amplifiers in wearable ECG sensors. IC Role / Device Role / Timing Role: Precision reference source for ADC reference divider network operating from coin-cell battery. Use Value: 50 µA test current and ±2 % tolerance ensure <1.5 mV reference drift over battery discharge cycle (2.0–3.0 V). |
| Industrial IoT Node Power Management | Automotive Cabin Temperature Sensor Interface |
Use Scenario: Regulation of 3.3 V LDO feedback divider in battery-backed wireless sensor nodes. IC Role / Device Role / Timing Role: Low-current Zener providing stable top-resistor voltage reference for feedback loop stability. Use Value: 80 Ω differential resistance minimizes load-induced error in high-impedance divider networks (<10 µA current draw). |
Use Scenario: Biasing thermistor measurement circuit in HVAC control unit with extended temperature range (−40 °C to +125 °C). IC Role / Device Role / Timing Role: Temperature-compensated voltage reference (−2.7 mV/K) compensating for thermistor nonlinearity. Use Value: Matched TC enables first-order linearization of NTC output without software correction in wide ambient 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-C4V7-Q | ±5 % tolerance, higher leakage (≤7.5 µA at 3.0 V), same SOD323 package and 4.7 V nominal rating | Acceptable where cost sensitivity outweighs precision; not recommended for calibrated medical sensors | Select for cost-driven automotive interior modules where ±5 % regulation is sufficient |
| MMSZ4704T1G | ±5 % tolerance, 500 mW Ptot, TO-236AB (SOT-23) package, 100 Ω rdiff at 5 mA | Higher power capability but larger footprint and looser regulation-suited for general-purpose clamping | Choose when board space allows SOT-23 and system requires margin above 300 mW dissipation |
Compared with BZX38450-B4V7-Q, the BZX384-C4V7-Q trades precision for cost in identical packaging, while MMSZ4704T1G offers higher power in a less space-efficient package-making the B-series part optimal for AEC-Q101-compliant, size-constrained, precision-bias applications.
Availability
BZX38450-B4V7-Q is available at Aetrix Electronics and suitable for automotive electronics, portable medical instrumentation, and industrial IoT sensor nodes requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for BZX38450-B4V7-Q 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 quality.
The BZX38450-Q series belongs to Nexperia's automotive-qualified Zener diode portfolio, engineered specifically for low-current voltage reference and clamping in safety-critical and space-constrained electronic control units.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX38450-B4V7-Q has a nominal Zener voltage of 4.7 V, with guaranteed breakdown occurring between 4.61 V and 4.79 V at 50 µA test current. It is not rated for sustained operation above its specified VZ; exceeding 4.79 V risks uncontrolled conduction or thermal runaway unless current-limited by external series resistance.
Can this Zener diode be used in forward conduction mode?
Yes-it exhibits a forward voltage ≤0.9 V at 10 mA, making it suitable for low-drop rectification or polarity protection in ultra-low-power paths. However, its primary design intent and characterization are for reverse-biased Zener operation; forward characteristics are secondary and not optimized for high-current switching.
How does the −2.7 mV/K temperature coefficient affect circuit performance?
This negative temperature coefficient means the Zener voltage decreases by approximately 2.7 mV per degree Celsius rise. In precision references, it must be compensated-e.g., by pairing with a positive-TC component-or accepted as a known, predictable drift within the system's operating temperature range (−40 °C to +125 °C).
Is the SOD323 package compatible with standard reflow soldering profiles?
Yes-the device is qualified for JEDEC J-STD-020D reflow, with peak temperature up to 260 °C. The recommended footprint (Fig. 10) uses 0.5 mm × 0.6 mm solder lands and 0.6 mm solder paste stencil openings, ensuring reliable joint formation without tombstoning or voiding on FR4 boards.
BZX38450-B4V7-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):
- 4.7 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 3 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-B4V7-QX FAQ
1.How can I place an order for BZX38450-B4V7-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B4V7-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-B4V7-QX reliable?
The price and inventory of BZX38450-B4V7-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-B4V7-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B4V7-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B4V7-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B4V7-QX?
BZX38450-B4V7-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B4V7-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-B4V7-QX?
For technical support, including BZX38450-B4V7-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B4V7-QX requirements.
6.How does Aetrix verify that BZX38450-B4V7-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B4V7-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-B4V7-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B4V7-QX?
All BZX38450-B4V7-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B4V7-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-B4V7-QX part is unused and in its original packaging.
Return procedure for BZX38450-B4V7-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B4V7-QX Tags
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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
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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
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BZT52C3V6LP-7
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SMAZ12-13-F
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