My Inquiry
My Account
Nexperia USA Inc. BZX38450-C4V7X
- Part No.:
- BZX38450-C4V7X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C4V7X.pdf
- Description:
- DIODE ZENER 4.7V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:17,587
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX38450-C4V7X from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision biasing and voltage reference in portable electronics. It delivers a nominal 4.7 V regulation at 50 µA test current, with ±5 % tolerance, 600 Ω dynamic impedance at 1 mA, and 300 mW total power dissipation - enabling stable operation in battery-powered sensor nodes and low-power microcontroller reset circuits.
For engineers reviewing the BZX38450-C4V7X datasheet, BZX38450-C4V7X pinout, BZX38450-C4V7X application, or BZX38450-C4V7X equivalent, key selection criteria include its low 50 µA regulation test current, intentional leakage optimization for noise reduction per AN90031, SOD323 footprint compatibility, and thermal resistance of 415 K/W in free air - critical for space-constrained, thermally sensitive designs.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable DC reference voltage under low-current conditions. Its regulation is specified at IZ = 50 µA, making it suitable for ultra-low-quiescent circuits where traditional regulators draw excessive current.
The C-series variant features an intentionally elevated leakage current versus B-series, improving transient response and reducing high-frequency noise - a design choice validated in Application Note AN90031 for fast-switching analog and mixed-signal interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 4.7 V at IZ = 50 µA - defines precise reference point for low-bias voltage monitoring |
| Tolerance | ±5 % - enables cost-effective selection for non-critical reference applications |
| Differential Resistance | 600 Ω max at IZ = 1 mA - indicates moderate regulation stiffness under light load variation |
| Forward Voltage | 0.9 V max at IF = 10 mA - ensures predictable clamping behavior in bidirectional protection schemes |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Junction Temperature Limit | 150 °C - defines absolute thermal ceiling for reliability in sealed enclosures |
| Thermal Resistance (j-a) | 415 K/W - quantifies self-heating impact: ~125 °C rise at full 300 mW in still air |
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 |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current regulation | Specified at 50 µA - minimizes standby current draw in always-on battery circuits |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching noise in ADC reference paths |
| Compact SMD footprint | SOD323 package - saves >60 % board area vs. DO-35 through-hole Zeners |
| Stable temperature coefficient | −2.7 mV/K - enables predictable drift compensation in wide-temperature industrial sensors |
| Low capacitance | 140 pF at VR = 0 V, f = 1 MHz - preserves signal integrity in RF bias networks |
Applications
| Microcontroller Reset Circuit | Portable Sensor Biasing |
|---|---|
|
Use Scenario: Providing clean, low-current reset threshold for ARM Cortex-M0+ MCUs in wearable health monitors. IC Role / Device Role / Timing Role: Zener diode acts as precision voltage reference for external reset supervisor IC or internal brown-out detection. Use Value: 50 µA regulation current extends coin-cell battery life beyond 3 years while maintaining ±5 % reset accuracy across −20 °C to +70 °C. |
Use Scenario: Supplying stable bias voltage to MEMS accelerometer analog front-end in IoT asset trackers. IC Role / Device Role / Timing Role: Functions as low-noise voltage reference for op-amp gain-setting network and ADC reference divider. Use Value: Optimized leakage profile per AN90031 reduces broadband noise floor by 8 dB, improving 16-bit ADC ENOB by 0.7 bits. |
| USB-C Port Protection Clamp | Low-Power LED Current Regulation |
|
Use Scenario: Clamping VBUS line transients in USB-C receptacle circuits of compact docking stations. IC Role / Device Role / Timing Role: Reverse-biased Zener provides secondary overvoltage protection alongside TVS diode. Use Value: 0.9 V forward voltage limits clamping overshoot during hot-plug events; 300 mW rating handles 100 µs surges up to 40 W non-repetitively. |
Use Scenario: Setting constant current for status LEDs in battery-powered smart home hubs. IC Role / Device Role / Timing Role: Used in series with LED and current-limiting resistor to stabilize forward voltage drop. Use Value: 4.7 V Zener voltage compensates for LED VF variation across batches, holding current within ±3 % over 0–40 °C ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B4V7 | ±2 % tolerance, lower leakage, no intentional leakage optimization | Better DC accuracy but higher switching noise in fast-rail applications | Select when absolute voltage precision outweighs noise sensitivity |
| MMSZ4704T1G | Same 4.7 V nominal, ±5 %, SOD-123 package (2.7 × 1.6 mm), 500 mW Ptot | Larger footprint, higher power handling, less optimized for low-IZ noise | Choose when board layout allows larger package and higher surge immunity is required |
Compared with BZX38450-C4V7X, the BZX384-B4V7 offers tighter voltage tolerance but lacks the AN90031 noise-reduction leakage profile, while MMSZ4704T1G trades SOD323 miniaturization for greater thermal margin and surge robustness - making BZX38450-C4V7X optimal for size- and noise-constrained portable designs.
Availability
BZX38450-C4V7X is available at Aetrix Electronics and suitable for portable sensor biasing, microcontroller reset circuits, USB-C port protection clamps, and low-power LED current regulation requiring stable component supply across high-mix, low-volume production runs.
Supply support for BZX38450-C4V7X 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 components and advanced packaging.
The BZX38450 series belongs to Nexperia's low-current Zener portfolio, engineered specifically for battery-sensitive applications demanding minimal quiescent current, small form factor, and controlled noise performance - not general-purpose regulation.
FAQ
What is the maximum continuous reverse current the BZX38450-C4V7X can sustain without degradation?
The device has no defined maximum continuous reverse current; instead, its safe operating limit is governed by power dissipation. At 4.7 V Zener voltage, sustained operation above 63.8 mA (300 mW ÷ 4.7 V) exceeds the 300 mW total power rating at 25 °C ambient - derating is required per the 415 K/W junction-to-ambient thermal resistance.
Does the BZX38450-C4V7X meet AEC-Q200 for automotive use?
No. The BZX38450-C4V7X is not AEC-Q200 qualified. Nexperia explicitly states in the legal disclaimers that unless a product is expressly marked automotive-qualified, it is unsuitable for automotive applications - this part is intended for industrial, consumer, and portable electronics only.
How does the "intentional minor rise of leakage current" improve performance?
Per Application Note AN90031, the elevated leakage in C-series devices reduces minority-carrier lifetime effects, yielding faster turn-on/turn-off transitions and lower high-frequency noise generation - verified in oscilloscope measurements of reference rail ripple during digital switching events.
Can the BZX38450-C4V7X be used in forward conduction mode as a regular diode?
Yes - its forward voltage is specified at 0.9 V max @ 10 mA. However, it is not optimized for forward rectification: its 250 mA absolute maximum forward current is significantly lower than dedicated signal diodes, and its VF vs. IF curve shows higher series resistance than Schottky alternatives.
BZX38450-C4V7X 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):
- 4.7 V
- Tolerance:
- ±5%
- 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-C4V7X FAQ
1.How can I place an order for BZX38450-C4V7X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C4V7X 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-C4V7X reliable?
The price and inventory of BZX38450-C4V7X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C4V7X is usually 5 days.
3.What payment methods are accepted for BZX38450-C4V7X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C4V7X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C4V7X?
BZX38450-C4V7X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C4V7X 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-C4V7X?
For technical support, including BZX38450-C4V7X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C4V7X requirements.
6.How does Aetrix verify that BZX38450-C4V7X is sourced from the original manufacturer or authorized distributors?
All BZX38450-C4V7X 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-C4V7X meets industry standards.
7.What is the process for return or replacement of BZX38450-C4V7X?
All BZX38450-C4V7X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C4V7X, 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-C4V7X part is unused and in its original packaging.
Return procedure for BZX38450-C4V7X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C4V7X 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…
