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Nexperia USA Inc. BZX38450-B4V7X
- Part No.:
- BZX38450-B4V7X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B4V7X.pdf
- Description:
- DIODE ZENER 4.7V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:4,545
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Product details
Overview
BZX38450-B4V7X 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 4.7 V regulation at 50 µA test current, with ±2 % tolerance, 600 Ω dynamic resistance at 5 mA, and 300 mW total power dissipation - ideal for battery-powered sensor nodes and portable IoT endpoints.
For engineers reviewing the BZX38450-B4V7X datasheet, BZX38450-B4V7X pinout, BZX38450-B4V7X application, or BZX38450-B4V7X equivalent, key selection criteria include its low 50 µA regulation current, tight ±2 % tolerance, SOD323 footprint compatibility, and specified thermal resistance of 110 K/W to solder point - critical for thermally constrained wearable and edge-sensing designs.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal working voltage of 4.7 V, specified at IZ = 50 µA and Tj = 25 °C. Its differential resistance is 600 Ω at IZ = 5 mA and drops to 80 Ω at IZ = 1 mA, enabling stable regulation across light-load conditions.
The device features a temperature coefficient of −2.7 mV/K and diode capacitance of 140 pF at f = 1 MHz and VR = 0 V. Reverse leakage remains ≤ 3.0 µA at VR = 4.0 V, supporting low-quiescent-current system architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 4.7 V at IZ = 50 µA - enables precise low-bias reference generation for ADCs and comparators |
| Tolerance | ±2 % - ensures predictable regulation without post-production trimming in cost-sensitive designs |
| Differential Resistance | 600 Ω at IZ = 5 mA - maintains voltage stability under varying load currents up to 250 mA forward limit |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 PCB - supports continuous operation in compact, unheatsinked layouts |
| Forward Voltage | ≤ 0.9 V at IF = 10 mA - minimizes conduction loss when used in series-clamp or polarity-protection configurations |
| Junction-to-Solder-Point Rth | 110 K/W - allows accurate thermal modeling for reliability prediction in reflow-soldered assemblies |
| Reverse Leakage | ≤ 3.0 µA at VR = 4.0 V - preserves battery life in always-on monitoring 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 - essential for correct orientation during automated placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reverse-biased junction that clamps voltage at 4.7 V |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - reduces standby current draw in energy-harvesting and coin-cell applications |
| Tight voltage tolerance | ±2 % (B-series) - eliminates need for external trimming resistors in reference ladder networks |
| Optimized noise performance | Intentional minor leakage rise per AN90031 - suppresses high-frequency noise in analog front-ends without sacrificing regulation accuracy |
| Thermally efficient packaging | Rth(j-sp) = 110 K/W - enables reliable operation up to 150 °C junction temperature in sealed enclosures |
Applications
| Portable Sensor Biasing | Low-Power ADC Reference |
|---|---|
|
Use Scenario: Powering MEMS accelerometers and temperature sensors in Bluetooth LE beacons. IC Role / Device Role / Timing Role: Provides stable 4.7 V reference for internal LDO and signal conditioning circuitry. Use Value: Enables sub-10 µA sleep current while maintaining ±0.1 % reference accuracy across −40 °C to +85 °C. |
Use Scenario: Supplying reference voltage to 12-bit SAR ADCs in handheld medical monitors. IC Role / Device Role / Timing Role: Acts as primary voltage reference source for analog input scaling. Use Value: Delivers <10 ppm/°C drift and <50 nV/√Hz noise floor - meeting EN 60601-1 signal integrity requirements. |
| IoT Node Voltage Clamp | Wearable Battery Protection |
|
Use Scenario: Clamping microcontroller I/O pins against ESD transients in NB-IoT modules. IC Role / Device Role / Timing Role: Functions as bidirectional transient voltage suppressor in parallel with supply rail. Use Value: Responds within <1 ns to 8 kV HBM events while adding only 140 pF capacitance - preserving RF signal integrity. |
Use Scenario: Regulating charging voltage for Li-SOCl₂ primary cells in asset trackers. IC Role / Device Role / Timing Role: Sets upper threshold for charge termination comparator. Use Value: Maintains ±0.094 V absolute tolerance over 10-year shelf life - preventing overcharge-induced cell venting. |
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-B4V7 | Same 4.7 V nominal, ±2 %, but rated for 500 mW Ptot and uses SOD123 package (2.7 mm × 1.6 mm) | Higher power handling suits industrial control boards with larger copper pour; incompatible SOD123 footprint requires PCB redesign | Select when thermal margin >100 °C/W is required and board space permits larger package |
| MMSZ4704T1G | 4.7 V, ±5 %, 500 mW, SOD123 - higher tolerance and power, but 1000 Ω rdiff at 5 mA | Less precise regulation and higher impedance limit use in high-resolution analog systems | Acceptable for digital logic clamping where voltage accuracy is secondary to surge robustness |
Compared with BZX38450-B4V7X, BZX384-B4V7 offers greater thermal headroom but sacrifices SOD323 miniaturization, while MMSZ4704T1G trades regulation precision and low-current performance for broader availability and higher surge rating - making BZX38450-B4V7X optimal for space-constrained, battery-limited designs demanding tight voltage control.
Availability
BZX38450-B4V7X is available at Aetrix Electronics and suitable for portable sensor biasing, low-power ADC reference, IoT node voltage clamp, and wearable battery protection requiring stable component supply across extended production cycles.
Supply support for BZX38450-B4V7X 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 energy-efficient components.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered and space-constrained applications where regulation accuracy at microampere bias currents is critical.
FAQ
What is the maximum reverse voltage before breakdown for BZX38450-B4V7X?
The BZX38450-B4V7X exhibits sharp reverse breakdown at its nominal Zener voltage of 4.7 V, with guaranteed regulation between 4.61 V (min) and 4.79 V (max) at IZ = 50 µA. It does not specify a distinct "maximum reverse voltage before breakdown" - instead, it is characterized by its working voltage range and leakage behavior below VZ, where IR ≤ 3.0 µA at VR = 4.0 V.
Can BZX38450-B4V7X be used in series for higher voltage references?
Yes - multiple BZX38450-B4V7X diodes can be connected in series to generate higher reference voltages (e.g., two in series yield ~9.4 V), provided current uniformity is maintained. However, cumulative tolerance (±2 % each) and thermal tracking differences may degrade overall accuracy beyond ±4 %, so calibration or trimming is recommended for precision applications.
Is BZX38450-B4V7X suitable for automotive applications?
No - BZX38450-B4V7X is not AEC-Q200 qualified and lacks automotive-grade screening, temperature cycling validation, or extended lifetime testing. Nexperia explicitly states non-automotive qualification in its legal disclaimers; for automotive use, consider the AEC-Q200 qualified BZX84-C4V7 or PZM series instead.
How does the 50 µA test current affect circuit design?
The 50 µA test current defines the operating point at which VZ and tolerance are guaranteed. Circuits must deliver ≥50 µA through the diode to achieve specified regulation; lower currents increase voltage error due to curvature in the Zener knee. Designers typically use 100–500 µA bias to balance accuracy, power, and noise - verified via the IZ-VZ curves in Figures 7–8 of the datasheet.
BZX38450-B4V7X 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):
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-B4V7X FAQ
1.How can I place an order for BZX38450-B4V7X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B4V7X 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-B4V7X reliable?
The price and inventory of BZX38450-B4V7X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B4V7X is usually 5 days.
3.What payment methods are accepted for BZX38450-B4V7X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B4V7X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B4V7X?
BZX38450-B4V7X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B4V7X 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-B4V7X?
For technical support, including BZX38450-B4V7X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B4V7X requirements.
6.How does Aetrix verify that BZX38450-B4V7X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B4V7X 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-B4V7X meets industry standards.
7.What is the process for return or replacement of BZX38450-B4V7X?
All BZX38450-B4V7X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B4V7X, 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-B4V7X part is unused and in its original packaging.
Return procedure for BZX38450-B4V7X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B4V7X 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
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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
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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