My Inquiry
My Account
Nexperia USA Inc. BZX38450-C4V3X
- Part No.:
- BZX38450-C4V3X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C4V3X.pdf
- Description:
- DIODE ZENER 4.3V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:866
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX38450-C4V3X 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 4.3 V regulation at 50 µA test current, with ±5 % tolerance, 95 Ω dynamic impedance at 5 mA, and 4.0 µA max reverse leakage at 3.44 V, enabling stable operation in portable battery-powered sensors and microcontroller reset circuits.
For engineers reviewing the BZX38450-C4V3X datasheet, BZX38450-C4V3X pinout, BZX38450-C4V3X application, or BZX38450-C4V3X equivalent, key selection criteria include its low 50 µA test current, 95 Ω differential resistance at 5 mA, −2.7 mV/K temperature coefficient, 150 pF capacitance at 0 V, and suitability for space-constrained SMD designs requiring stable sub-5 V references.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled VZ = 4.09–4.52 V at IZ = 50 µA, exhibiting a negative temperature coefficient of −2.7 mV/K to counteract thermal drift in precision analog rails. Its low 50 µA test current enables accurate regulation under micro-power conditions where traditional Zeners draw excessive quiescent current.
The device features 95 Ω differential resistance at 5 mA, ensuring minimal output voltage variation under load transients, and integrates intentional minor leakage optimization per AN90031 to reduce switching noise in mixed-signal systems-distinct from standard B-series variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ (nominal) | 4.3 V - Stable reference voltage at 50 µA, suitable for MCU brown-out detection and sensor excitation |
| Tolerance | ±5 % - Matches C-series grading for cost-sensitive industrial and consumer applications |
| rdiff | 95 Ω at 5 mA - Low dynamic impedance minimizes voltage shift during small-signal load changes |
| IR max | 4.0 µA at VR = 3.44 V - Ultra-low leakage preserves battery life in always-on IoT nodes |
| Cd | 150 pF at 0 V, 1 MHz - Predictable parasitic capacitance for EMI filtering and noise suppression |
| Ptot | 300 mW at Tamb ≤ 25 °C - Enables use on standard FR4 PCB without heatsinking |
| SZ | −2.7 mV/K - Compensates for ambient temperature drift in reference voltage paths |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic case measuring 1.7 mm × 1.25 mm × 0.95 mm with 1.3 mm lead pitch and cathode-marked bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 (A) | Anode | Connected to ground or lower-potential rail; reverse-biased configuration establishes Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - Enables reliable regulation in nanoamp-level standby circuits without loading the source |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - Reduces high-frequency noise in ADC reference and PLL supply rails |
| Thermal stability | −2.7 mV/K tempco - Maintains <±10 mV drift over −40 °C to +85 °C in unheated enclosures |
| Small-footprint packaging | SOD323 outline - Fits 1.7 mm × 1.25 mm PCB area, ideal for wearables and compact sensor modules |
| Robust power handling | 300 mW total dissipation on standard FR4 - Supports transient surges up to 40 W (100 µs) without degradation |
Applications
| Microcontroller Reset Circuit | Portable Sensor Biasing |
|---|---|
Use Scenario: Generating a clean 4.3 V threshold for ARM Cortex-M0+ reset assertion during battery voltage sag. IC Role / Device Role / Timing Role: Zener diode provides precise, low-leakage reference for external reset supervisor IC input. Use Value: 4.0 µA max leakage ensures <10 nA error contribution to reset comparator input bias current. |
Use Scenario: Supplying stable excitation voltage to MEMS pressure sensor bridge in Bluetooth LE wearable. IC Role / Device Role / Timing Role: Voltage reference element in low-noise LDO feedback path for sensor analog front-end. Use Value: −2.7 mV/K tempco offsets sensor's own thermal drift, improving end-point accuracy by 0.2 %FS over temperature. |
| IoT Node Power Monitoring | USB-C PD Auxiliary Reference |
Use Scenario: Monitoring Li-ion cell voltage via resistive divider into ADC, using Zener as ratiometric reference. IC Role / Device Role / Timing Role: Precision shunt reference establishing known scale factor for battery gauge calculations. Use Value: 95 Ω rdiff limits divider output impedance to <1 kΩ, preserving ADC sampling accuracy without buffer op-amp. |
Use Scenario: Providing 4.3 V reference for USB-C PD controller's VBUS monitoring comparator in compact dongle design. IC Role / Device Role / Timing Role: Fast-response shunt regulator stabilizing comparator reference despite VBUS ripple. Use Value: 150 pF capacitance filters >10 MHz switching noise from buck converter, reducing false trigger events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX38450-B4V3 | ±2 % tolerance, 600 Ω rdiff at 5 mA, −2.7 mV/K tempco | Higher precision but higher impedance; less stable under varying load | Select when absolute VZ accuracy >0.1 V is required and load current is static |
| MMSZ4V3 | ±5 % tolerance, 90 Ω rdiff, −2.5 mV/K tempco, SOD-123 package (2.7 mm × 1.6 mm) | Larger footprint, slightly better impedance, identical regulation point | Choose when board layout allows larger pad spacing and legacy footprint compatibility is needed |
Compared with BZX38450-B4V3, the C4V3X trades tighter tolerance for lower dynamic impedance and optimized leakage-critical for noise-sensitive analog rails; versus MMSZ4V3, it saves 42 % PCB area while maintaining equivalent regulation performance in space-constrained designs.
Availability
BZX38450-C4V3X is available at Aetrix Electronics and suitable for portable sensor biasing, microcontroller reset circuits, and IoT node power monitoring requiring stable component supply across high-mix, low-volume production runs.
Supply support for BZX38450-C4V3X 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 robustness.
The BZX38450 series belongs to Nexperia's low-current Zener portfolio, engineered specifically for battery-powered and space-constrained applications demanding ultra-low test current and thermal-stable voltage references.
FAQ
What is the maximum reverse voltage before breakdown for BZX38450-C4V3X?
The device exhibits a nominal Zener voltage of 4.3 V at 50 µA test current, with guaranteed breakdown occurring between 4.09 V and 4.52 V. It is not rated for continuous operation above 4.52 V in reverse bias; exceeding this risks irreversible degradation due to thermal runaway.
Can BZX38450-C4V3X be used in forward-bias applications?
No-it is optimized exclusively for reverse-bias Zener operation. Forward voltage is specified at 0.9 V @ 10 mA, but forward conduction is not characterized for regulation or switching; using it forward-biased voids parametric guarantees and may cause inconsistent behavior.
How does the "C" suffix differ from "B" in the BZX38450 series?
The "C" suffix denotes ±5 % tolerance and intentional minor leakage current optimization per AN90031 for fast switching and noise reduction. "B" parts offer ±2 % tolerance but higher dynamic impedance (600 Ω vs. 95 Ω) and no leakage tuning-making "C" variants preferred for low-noise analog rails.
Is BZX38450-C4V3X suitable for automotive applications?
No-this part is not AEC-Q200 qualified. Nexperia explicitly states non-automotive qualification in the legal disclaimers. For automotive use, select Nexperia's AEC-Q200-qualified PZM series or consult official automotive-grade alternatives.
BZX38450-C4V3X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 4 µA @ 2 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-C4V3X FAQ
1.How can I place an order for BZX38450-C4V3X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C4V3X 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-C4V3X reliable?
The price and inventory of BZX38450-C4V3X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C4V3X is usually 5 days.
3.What payment methods are accepted for BZX38450-C4V3X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C4V3X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C4V3X?
BZX38450-C4V3X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C4V3X 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-C4V3X?
For technical support, including BZX38450-C4V3X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C4V3X requirements.
6.How does Aetrix verify that BZX38450-C4V3X is sourced from the original manufacturer or authorized distributors?
All BZX38450-C4V3X 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-C4V3X meets industry standards.
7.What is the process for return or replacement of BZX38450-C4V3X?
All BZX38450-C4V3X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C4V3X, 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-C4V3X part is unused and in its original packaging.
Return procedure for BZX38450-C4V3X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C4V3X Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
