My Inquiry
My Account
Nexperia USA Inc. BZX38450-B30-QX
- Part No.:
- BZX38450-B30-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B30-QX.pdf
- Description:
- DIODE ZENER 30V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,230
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX38450-B30-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 30 V nominal working voltage at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX38450-B30-QX datasheet, BZX38450-B30-QX pinout, BZX38450-B30-QX application, or BZX38450-B30-QX equivalent, this page delivers verified electrical characteristics, thermal resistance values, reverse leakage behavior at VR = 29 V, and design implications of its 300 mW derating on FR4 PCBs.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified VZ = 29.4–30.6 V at IZ = 50 µA, exhibiting a temperature coefficient of +0.05 mV/K and differential resistance ≤300 Ω at IZ = 5 mA. Its low 50 µA test current enables stable regulation in ultra-low-power bias networks.
The device features intentional minor leakage current optimization per AN90031 for fast switching transients and reduced noise in signal-path references. Thermal resistance from junction to ambient is 415 K/W on standard FR4, limiting continuous power handling without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ (nominal) | 30 V - Stable reference voltage at 50 µA, enabling precision low-bias regulation in battery-powered sensors. |
| Tolerance | ±2 % - Tight voltage accuracy supports designs requiring <±0.6 V variation across operating temperature range. |
| Ptot | 300 mW - Maximum dissipation on FR4 PCB; requires thermal layout consideration above ~100 mW continuous load. |
| IR @ VR = 29 V | ≤0.05 µA - Ultra-low reverse leakage preserves battery life in always-on monitoring circuits. |
| rdiff | ≤300 Ω - Low dynamic impedance ensures minimal output voltage shift under small load variations. |
| Rth(j-a) | 415 K/W - Junction-to-ambient thermal resistance dictates board-level copper area requirements for thermal management. |
| AEC-Q101 | Qualified - Meets stress-test requirements for automotive under-hood and infotainment applications. |
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 voltage node; marking bar identifies this terminal for correct PCB orientation. |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased configuration establishes Zener conduction path. |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - Enables regulation in microampere-bias circuits such as RTC backup supplies and sensor wake-up references. |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - Reduces switching noise and improves transient response in feedback paths. |
| Automotive qualification | AEC-Q101 compliant - Validated for temperature cycling, humidity, and mechanical shock in automotive ECUs and lighting modules. |
| Small footprint | SOD323 package - Saves board space in compact modules like TPMS sensors and ADAS camera control units. |
Applications
| Automotive Sensor Reference | Portable Medical Monitor Bias |
|---|---|
Use Scenario: Providing stable 30 V reference for analog front-end amplifiers in engine knock sensors. IC Role / Device Role / Timing Role: Voltage reference element in signal conditioning chain, establishing precise gain-setting node. Use Value: ±2 % tolerance and low 50 µA test current ensure consistent amplifier offset calibration across −40 °C to +125 °C. |
Use Scenario: Supplying regulated bias to photodiode transimpedance amplifiers in handheld pulse oximeters. IC Role / Device Role / Timing Role: Low-current Zener shunt regulator maintaining fixed headroom for op-amp rail-to-rail input stage. Use Value: 0.05 µA leakage at 29 V minimizes quiescent drain on coin-cell batteries during standby. |
| Industrial IoT Node Power Supervision | Smart Meter Voltage Monitoring |
Use Scenario: Monitoring main supply rail integrity via resistor-divider + Zener clamp in LoRaWAN endpoint nodes. IC Role / Device Role / Timing Role: Overvoltage protection and threshold detection element tied to MCU ADC input. Use Value: 300 mW rating allows brief surge clamping; AEC-Q101 qualification ensures reliability in outdoor meter enclosures. |
Use Scenario: Generating accurate 30 V reference for high-side voltage divider in polyphase electricity meters. IC Role / Device Role / Timing Role: Precision shunt reference stabilizing measurement path against supply ripple and temperature drift. Use Value: +0.05 mV/K tempco and ≤300 Ω rdiff limit reference error to <0.1 % over 0–70 °C operating range. |
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-C30-Q | ±5 % tolerance, higher leakage (0.1 µA @ 29 V), same SOD323 package and 30 V nominal rating | Acceptable where cost sensitivity outweighs precision; less suitable for battery-critical or high-accuracy ADC references | Select when budget constraints dominate and ±5 % VZ variation is acceptable in final system tolerance stack-up |
| MMSZ5256ET1G | 30 V nominal, ±5 %, 500 mW Ptot, SOD-123 package (larger footprint), no AEC-Q101 qualification | Higher power handling but lacks automotive qualification and has 3× larger board area requirement | Choose only for non-automotive industrial applications needing >300 mW dissipation and where SOD-123 is already standardized |
Compared with BZX38450-B30-QX, the BZX384-C30-Q trades precision for cost, while MMSZ5256ET1G offers higher power but sacrifices automotive compliance and miniaturization-making the BZX38450-B30-QX optimal for space-constrained, safety-aware, low-bias automotive and portable designs.
Availability
BZX38450-B30-QX is available at Aetrix Electronics and suitable for automotive sensor modules, portable medical devices, and industrial IoT nodes requiring stable component supply with AEC-Q101 assurance and tight voltage tolerance.
Supply support for BZX38450-B30-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 delivering high-performance logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for automotive and industrial markets.
The BZX38450-Q series belongs to Nexperia's automotive-grade Zener regulator portfolio, designed specifically for low-current, high-stability voltage reference needs in harsh-environment electronics where size, leakage, and qualification matter.
FAQ
What is the maximum continuous reverse voltage this diode can regulate without exceeding its power limit?
At ambient temperature ≤25 °C on standard FR4 PCB, BZX38450-B30-QX sustains up to 30 V at ≤10 mA (300 mW), but practical continuous operation should stay below 29 V at 8 mA to accommodate thermal derating above 25 °C and ensure long-term reliability.
How does the ±2 % tolerance affect system-level accuracy in a 12-bit ADC reference circuit?
With a 30 V nominal Zener and ±2 % tolerance, the actual VZ falls between 29.4 V and 30.6 V. In a resistor-divider-based ADC reference, this introduces up to ±0.4 LSB error at full scale for a 3.3 V ADC reference derived from it-requiring calibration if sub-LSB accuracy is needed.
Can this diode be used in parallel for higher current capability?
No-Zener diodes exhibit negative temperature coefficients and mismatched VZ curves; paralleling BZX38450-B30-QX units causes current hogging and thermal runaway. Use a single unit with appropriate series resistance or select a higher-power Zener instead.
Is the cathode marking bar visible under standard optical inspection after reflow soldering?
Yes-the cathode bar is laser-marked on the top surface of the SOD323 package and remains clearly visible post-reflow, supporting automated optical inspection (AOI) and manual verification without magnification in typical production environments.
BZX38450-B30-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):
- 30 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 22.8 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-B30-QX FAQ
1.How can I place an order for BZX38450-B30-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B30-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-B30-QX reliable?
The price and inventory of BZX38450-B30-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-B30-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B30-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B30-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B30-QX?
BZX38450-B30-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B30-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-B30-QX?
For technical support, including BZX38450-B30-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B30-QX requirements.
6.How does Aetrix verify that BZX38450-B30-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B30-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-B30-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B30-QX?
All BZX38450-B30-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B30-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-B30-QX part is unused and in its original packaging.
Return procedure for BZX38450-B30-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B30-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…
