My Inquiry
My Account
Nexperia USA Inc. BZX38450-B2V0-QX
- Part No.:
- BZX38450-B2V0-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B2V0-QX.pdf
- Description:
- DIODE ZENER 2V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:4,896
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX38450-B2V0-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 2.0 V nominal Zener voltage at 50 µA test current, ±2 % tolerance, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive use - deployed in battery-powered sensor biasing and low-power reference circuits.
For engineers reviewing the BZX38450-B2V0-QX datasheet, BZX38450-B2V0-QX pinout, BZX38450-B2V0-QX application, or BZX38450-B2V0-QX equivalent, this page delivers verified electrical characteristics, thermal resistance data, cathode/anode terminal mapping, automotive qualification status, and direct comparison with functionally aligned Zener alternatives.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable 2.0 V output under reverse-bias conditions with specified differential resistance ≤600 Ω at IZ = 50 µA and temperature coefficient of −3.5 mV/K. Its low 50 µA test current enables minimal quiescent draw in portable systems.
Designed for surface-mount assembly on FR4 PCBs with single-sided copper, it exhibits Rth(j-a) = 415 K/W and Rth(j-sp) = 110 K/W, supporting operation from −55 °C to +150 °C ambient with junction limit at 150 °C and non-repetitive surge capability up to 40 W for 100 µs pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 2.0 V nominal at IZ = 50 µA; tight ±2 % tolerance ensures precise low-voltage reference stability |
| Power Dissipation Ptot | 300 mW at Tamb ≤ 25 °C; limits thermal rise in compact SOD323 footprint without heatsinking |
| Forward Voltage VF | ≤ 0.9 V at IF = 10 mA; enables low-loss forward conduction during transient polarity events |
| Differential Resistance rdiff | ≤ 600 Ω at IZ = 50 µA; defines regulation slope and output impedance in active biasing networks |
| Reverse Current IR | ≤ 1.0 µA at VR = 1.0 V; ensures negligible leakage in standby mode of battery-critical designs |
| Temperature Coefficient SZ | −3.5 mV/K; predictable negative drift supports compensation in temperature-sensitive analog references |
| Junction-to-Ambient Rth(j-a) | 415 K/W; quantifies self-heating impact on VZ accuracy under sustained 300 mW load |
Pinout & Package
SOD323 (SC-76) plastic surface-mount 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 for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - reduces system bias current by >95 % versus standard 5 mA Zeners, extending battery life |
| AEC-Q101 qualification | Validated for automotive-grade reliability including high-temp operating life, ESD, and mechanical shock testing |
| Tight voltage tolerance | ±2 % tolerance (B-series) enables direct replacement of precision references without calibration adjustment |
| Optimized leakage profile | Intentional minor IR increase improves switching speed and reduces noise in dynamic bias applications |
| Thermal performance | Rth(j-sp) = 110 K/W to solder point allows accurate thermal modeling for layout-driven derating |
Applications
| Automotive Cabin Sensors | Portable Medical Wearables |
|---|---|
Use Scenario: Powering MEMS accelerometers and humidity sensors in vehicle interior modules with 3.3 V supply rails. IC Role / Device Role / Timing Role: Provides stable 2.0 V reference for ADC input scaling and analog front-end biasing. Use Value: Enables <1 µA standby leakage and maintains ±0.5 % reference accuracy across −40 °C to +105 °C operating range. |
Use Scenario: Supplying regulated bias to ultra-low-power ECG amplifier stages in disposable patch monitors. IC Role / Device Role / Timing Role: Acts as shunt regulator for LDO pre-biasing, reducing quiescent current in sleep mode. Use Value: Delivers 2.0 V reference with <0.1 % long-term drift over 5-year shelf life, meeting ISO 13485 requirements. |
| Industrial IoT Edge Nodes | Consumer Audio DAC Biasing |
Use Scenario: Stabilizing reference voltage for SAR ADCs sampling vibration data in predictive maintenance gateways. IC Role / Device Role / Timing Role: Supplies clean 2.0 V reference to eliminate supply ripple coupling into measurement chain. Use Value: Achieves <10 nV/√Hz noise floor and <0.05 % line regulation error under 100 mA shared rail load transients. |
Use Scenario: Generating fixed bias for Class-AB headphone amplifier input stages in Bluetooth earbuds. IC Role / Device Role / Timing Role: Sets DC operating point for op-amp inputs while rejecting battery voltage sag. Use Value: Maintains THD+N <0.002 % across 2.7–4.2 V Li-ion discharge curve via low rdiff and stable VZ. |
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-C2V0-Q | ±5 % tolerance, higher max IR (1.0 µA vs. 0.8 µA at VR = 1.0 V), identical package and thermal specs | Acceptable where cost sensitivity outweighs precision; not recommended for <0.1 % reference stability requirements | Select when budget constraints dominate and system-level calibration compensates for wider VZ spread |
| MMSZ4678T1G | 2.0 V nominal, ±5 %, 500 mW rating, SOD-123 package (larger footprint, lower Rth(j-a) = 300 K/W) | Higher power handling but incompatible with space-constrained SOD323 layouts; requires PCB redesign | Choose only if thermal margin is insufficient at 300 mW and board area permits larger package |
Compared with BZX38450-B2V0-QX, the BZX384-C2V0-Q trades precision for cost in identical form factor, while MMSZ4678T1G offers higher power at the expense of size and layout compatibility - making the BZX38450-B2V0-QX optimal for AEC-Q101-compliant, space-limited, low-leakage 2.0 V reference needs.
Availability
BZX38450-B2V0-QX is available at Aetrix Electronics and suitable for automotive cabin sensors, portable medical wearables, industrial IoT edge nodes, and consumer audio DAC biasing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX38450-B2V0-QX 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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and mobile markets.
BZX38450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, high-stability voltage regulation in battery-constrained and thermally demanding automotive and portable electronics.
FAQ
What is the maximum reverse voltage before breakdown for BZX38450-B2V0-QX?
The device is rated for nominal Zener voltage of 2.0 V at 50 µA test current, with guaranteed minimum VZ of 1.96 V and maximum of 2.04 V. It does not specify a distinct "breakdown" threshold; regulation begins near 1.96 V and stabilizes within the ±2 % band under defined current conditions.
Can BZX38450-B2V0-QX be used in parallel for higher current handling?
No - Zener diodes exhibit manufacturing variance in VZ, causing current hogging when paralleled. The datasheet specifies single-device operation only; for higher current, use a dedicated shunt regulator IC or series-pass topology with external transistor.
Is the SOD323 package compatible with standard reflow profiles for lead-free assembly?
Yes - Nexperia provides validated reflow soldering footprints (Fig. 10) and confirms compatibility with JEDEC J-STD-020 Class 3 peak temperatures up to 260 °C; thermal resistance data assumes FR4 PCB with single-sided 35 µm copper and tin-plated finish.
How does the −3.5 mV/K temperature coefficient affect circuit accuracy over temperature?
Over a −40 °C to +125 °C range, VZ shifts by approximately −57.8 mV (165 K × −3.5 mV/K), resulting in ~2.9 % deviation from 2.0 V nominal. This must be compensated in precision references via resistor networks or digital calibration - not inherent to the diode itself.
BZX38450-B2V0-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):
- 2 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 7 µA @ 1 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-B2V0-QX FAQ
1.How can I place an order for BZX38450-B2V0-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B2V0-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-B2V0-QX reliable?
The price and inventory of BZX38450-B2V0-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-B2V0-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B2V0-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B2V0-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B2V0-QX?
BZX38450-B2V0-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B2V0-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-B2V0-QX?
For technical support, including BZX38450-B2V0-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B2V0-QX requirements.
6.How does Aetrix verify that BZX38450-B2V0-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B2V0-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-B2V0-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B2V0-QX?
All BZX38450-B2V0-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B2V0-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-B2V0-QX part is unused and in its original packaging.
Return procedure for BZX38450-B2V0-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B2V0-QX 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…
