My Inquiry
My Account
Nexperia USA Inc. BZX38450-C3V3F
- Part No.:
- BZX38450-C3V3F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C3V3F.pdf
- Description:
- DIODE ZENER 3.3V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:29,955
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX38450-C3V3F 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 3.3 V regulation at 50 µA test current, with ±2 % tolerance, 160 Ω differential resistance at 5 mA, and 1.5 µA reverse current at 3.0 V, enabling stable operation in portable battery-powered sensor nodes and microcontroller reset circuits.
For engineers reviewing the BZX38450-C3V3F datasheet, BZX38450-C3V3F pinout, BZX38450-C3V3F application, or BZX38450-C3V3F equivalent, key selection criteria include its 3.3 V ±2 % Zener voltage, 300 mW power rating, SOD323 footprint compatibility, and optimized leakage profile for low-bias analog front-ends and voltage monitoring in wearables and IoT edge devices.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining a stable 3.3 V output across load variations by conducting reverse current above its breakdown threshold. Its specified test current of 50 µA enables accurate regulation in sub-100 µA bias networks, while the intentional minor leakage rise improves switching speed and reduces noise in signal conditioning paths.
The diode exhibits a temperature coefficient of −3.5 mV/K and junction-to-ambient thermal resistance of 415 K/W on FR4 PCB, supporting reliable operation from −55 °C to +150 °C ambient. Its 160 Ω dynamic impedance at 5 mA ensures minimal voltage deviation under moderate load transients typical in LDO feedback networks and ADC reference buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V ±2 % at IZ = 50 µA - precise reference for 3.3 V rail monitoring and MCU brown-out detection |
| Differential Resistance (rdiff) | 160 Ω max at IZ = 5 mA - low impedance ensures <±10 mV shift under 100 µA load variation |
| Reverse Current (IR) | 1.5 µA max at VR = 3.0 V - ultra-low leakage preserves battery life in always-on sensing circuits |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - enables use as low-drop rectifier or clamp in signal protection |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - supports continuous regulation in compact SOD323 layout without heatsinking |
| Junction Temperature (Tj) | 150 °C max - allows operation in high-temperature industrial enclosures and automotive under-hood proximity |
| Package | SOD323 (SC-76), 1.7 mm × 1.25 mm × 0.95 mm - compatible with standard 0805 reflow footprints and automated placement |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package with cathode-marked end and 1.3 mm lead pitch. Body dimensions: 1.7 mm × 1.25 mm × 0.95 mm. Marking bar indicates cathode terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated voltage node; reverse-biased during Zener operation; marking bar identifies this terminal |
| 2 (A) | Anode | Connected to ground or lower-potential reference; completes shunt path for excess current dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current specification | 50 µA Zener test point - enables accurate regulation in nanoampere-bias circuits like CMOS oscillator references |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching noise and improves transient response in analog signal chains |
| Tight voltage tolerance | ±2 % (C-series) - eliminates need for external trimming in 3.3 V system-level voltage supervision |
| Thermal robustness | −55 °C to +150 °C operating range - supports deployment in extended-temperature industrial control and metering modules |
| Small-footprint reliability | SOD323 package with 415 K/W Rth(j-a) - achieves full 300 mW rating on standard FR4 without thermal vias or copper pour |
Applications
| Portable Sensor Node Power Management | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Regulating reference voltage for an ultra-low-power environmental sensor IC powered by a CR2032 coin cell. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 3.3 V bias to the sensor's internal ADC and digital core. Use Value: 1.5 µA reverse leakage at 3.0 V extends battery life beyond 5 years while maintaining ±2 % accuracy over temperature. |
Use Scenario: Generating a clean reset threshold for an ARM Cortex-M0+ microcontroller in a smart home actuator. IC Role / Device Role / Timing Role: Zener-based reset supervisor that triggers POR when VDD drops below 3.3 V × 0.9 = 2.97 V. Use Value: 160 Ω dynamic impedance ensures reset threshold shifts <±5 mV across 0–100 µA supply current variation, preventing false resets. |
| IoT Edge Device Voltage Monitoring | Low-Power Analog Front-End Biasing |
Use Scenario: Monitoring Li-ion battery voltage in a BLE beacon using an ADC input scaled via resistive divider. IC Role / Device Role / Timing Role: Precision 3.3 V reference for ADC full-scale calibration and battery state-of-charge calculation. Use Value: ±2 % tolerance eliminates software calibration overhead; −3.5 mV/K tempco keeps measurement error <±0.1% over −20 °C to +70 °C. |
Use Scenario: Biasing op-amp input stages and transimpedance amplifiers in optical pulse oximetry sensors. IC Role / Device Role / Timing Role: Low-noise voltage reference establishing DC operating point for analog signal conditioning. Use Value: Optimized leakage profile per AN90031 suppresses 1/f noise, improving SNR by >3 dB in sub-10 kHz physiological signal bands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5226BS-7-F | 3.3 V ±5 %, 200 mW rating, SOT-23 package (2.9 mm × 1.3 mm) | Larger footprint; higher 5 µA leakage at 3.0 V; no intentional leakage optimization | Select when cost sensitivity outweighs size and leakage requirements; verify PCB space and thermal margin. |
| Vishay BZX384-C3V3 | Identical 3.3 V ±2 %, 300 mW, SOD323 package; same pinout and marking | No AN90031 leakage optimization; slightly higher rdiff (180 Ω vs. 160 Ω) | Drop-in replacement where legacy qualification or dual-sourcing is required; expect ~12 % higher dynamic impedance. |
Compared with MMBZ5226BS-7-F, BZX38450-C3V3F offers tighter tolerance, lower leakage, and smaller footprint; versus Vishay BZX384-C3V3, it delivers improved dynamic impedance and noise-optimized leakage behavior for high-precision analog systems.
Availability
BZX38450-C3V3F is available at Aetrix Electronics and suitable for portable sensor nodes, microcontroller reset circuits, IoT edge device voltage monitoring, and low-power analog front-end biasing requiring stable component supply across long-lifecycle industrial and consumer programs.
Supply support for BZX38450-C3V3F 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, discrete, and MOSFET components, headquartered in Nijmegen, Netherlands.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-constrained and noise-sensitive applications where regulation accuracy, ultra-low leakage, and miniature packaging are critical design constraints.
FAQ
What is the maximum reverse voltage before breakdown for BZX38450-C3V3F?
The nominal Zener voltage is 3.3 V at 50 µA test current, with guaranteed minimum and maximum values of 3.13 V and 3.47 V respectively. Breakdown occurs within this band; operation above 3.47 V risks exceeding specified differential resistance and thermal limits. Absolute maximum reverse voltage is not defined-only the Zener region is functional.
Can BZX38450-C3V3F be used in forward conduction mode?
Yes-it functions as a standard silicon diode in forward bias with VF ≤ 0.9 V at 10 mA. However, its primary design purpose is reverse-biased Zener regulation; forward use is limited to clamping or low-current rectification where 0.9 V drop and 250 mA absolute maximum forward current are acceptable.
How does the "C" suffix differ from "B" in the BZX38450 series?
The "C" suffix denotes ±2 % Zener voltage tolerance (e.g., 3.13–3.47 V for 3.3 V nominal), while "B" indicates ±5 % (e.g., 3.14–3.46 V). Both share identical package, power rating, and thermal specs, but "C" parts enable tighter system-level voltage margining without calibration.
Is BZX38450-C3V3F suitable for automotive applications?
No-this part is not AEC-Q200 qualified and lacks automotive-grade screening, temperature validation, or failure rate data. Nexperia explicitly states non-automotive qualification in its legal disclaimers; use only in industrial, consumer, or medical applications meeting its −55 °C to +150 °C operating range.
BZX38450-C3V3F 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):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 1.5 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-C3V3F FAQ
1.How can I place an order for BZX38450-C3V3F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C3V3F 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-C3V3F reliable?
The price and inventory of BZX38450-C3V3F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C3V3F is usually 5 days.
3.What payment methods are accepted for BZX38450-C3V3F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C3V3F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C3V3F?
BZX38450-C3V3F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C3V3F 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-C3V3F?
For technical support, including BZX38450-C3V3F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C3V3F requirements.
6.How does Aetrix verify that BZX38450-C3V3F is sourced from the original manufacturer or authorized distributors?
All BZX38450-C3V3F 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-C3V3F meets industry standards.
7.What is the process for return or replacement of BZX38450-C3V3F?
All BZX38450-C3V3F units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C3V3F, 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-C3V3F part is unused and in its original packaging.
Return procedure for BZX38450-C3V3F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C3V3F 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…
