My Inquiry
My Account
Nexperia USA Inc. BZX38450-B24X
- Part No.:
- BZX38450-B24X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B24X.pdf
- Description:
- DIODE ZENER 24V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,400
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX38450-B24X from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 24 V nominal working voltage at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 250 mA maximum forward current - used for precision biasing and voltage reference in portable battery-powered circuits.
For engineers reviewing the BZX38450-B24X datasheet, BZX38450-B24X pinout, BZX38450-B24X application, or BZX38450-B24X equivalent, this page delivers verified electrical parameters, thermal resistance values, reverse leakage behavior at VR = 24 V, differential resistance at IZ = 5 mA, and junction-to-solder-point thermal path data critical for low-power analog design validation.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable 24 V output across load variations by conducting reverse current above its Zener knee. Its specified test current of 50 µA enables ultra-low quiescent operation in energy-constrained systems.
It exhibits a temperature coefficient of +18.2 mV/K at 24 V and 5 mA, with differential resistance ≤250 Ω and reverse capacitance of 55 pF at 0 V, supporting stable DC regulation without significant AC coupling effects in signal-path references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VZ) | 23.5 V to 24.5 V at IZ = 50 µA - defines tight regulation window for 24 V reference applications |
| Tolerance | ±2 % - ensures predictable voltage accuracy without post-production trimming |
| Differential Resistance (rdiff) | ≤250 Ω at IZ = 5 mA - limits output impedance drift under varying load current |
| Reverse Current (IR) | ≤0.05 µA at VR = 24 V - minimizes standby power loss in always-on circuits |
| Thermal Resistance (Rth(j-sp)) | 110 K/W - quantifies junction-to-solder-point heat transfer efficiency on FR4 PCB |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - supports low-loss anode-side biasing in dual-supply configurations |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard PCB layout |
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; polarity marker determines correct orientation during placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in microamp-level bias networks without loading error |
| Controlled leakage optimization | Intentional minor IR rise per AN90031 - improves switching transient response and reduces noise in feedback paths |
| Stable temperature coefficient | +18.2 mV/K at 24 V - allows predictable drift compensation in temperature-sensitive references |
| Small-footprint SMD packaging | SOD323 outline with 1.3 mm pitch - supports high-density PCB layouts in space-constrained wearables and IoT nodes |
Applications
| Portable Sensor Biasing | Microcontroller Reset Reference |
|---|---|
Use Scenario: Providing stable 24 V reference to analog front-end of battery-powered environmental sensor node operating at <100 µA average current. IC Role / Device Role / Timing Role: Shunt voltage regulator establishing precise bias point for op-amp input stage and ADC reference divider. Use Value: Enables <±0.5 % measurement accuracy over −40 °C to +85 °C due to low rdiff and known SZ drift. |
Use Scenario: Generating clean reset threshold for 32-bit ARM Cortex-M microcontroller in industrial edge gateway with coin-cell backup. IC Role / Device Role / Timing Role: Zener clamp defining logic-high threshold for external reset supervisor IC input. Use Value: Guarantees reliable reset assertion down to 2.2 V supply with <0.05 µA leakage at VR = 24 V. |
| Low-Power RF Front-End Bias | IoT Node Voltage Monitor |
Use Scenario: Supplying regulated gate bias to discrete LNA transistor in sub-GHz ISM-band transceiver powered by single Li-SOCl₂ cell. IC Role / Device Role / Timing Role: Precision shunt regulator stabilizing 24 V VGG rail independent of battery discharge curve. Use Value: Maintains amplifier gain flatness within ±0.3 dB over 3.0–3.6 V input range using only 50 µA quiescent current. |
Use Scenario: Monitoring battery health in NB-IoT tracker by comparing sensed voltage against 24 V Zener reference via SAR ADC. IC Role / Device Role / Timing Role: Fixed-voltage reference source for ratiometric ADC measurement of battery voltage divider output. Use Value: Delivers <0.1 % reference stability over 10-year deployment due to low IR drift and SC-76 thermal coupling control. |
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-C24 | ±5 % tolerance, higher leakage (0.1 µA at VR = 24 V), same SOD323 package | Acceptable where cost sensitivity outweighs precision; unsuitable for sub-µA standby designs | Select when absolute voltage accuracy is secondary to procurement flexibility and unit cost |
| MMSZ5245B | Same 24 V rating but ±5 % tolerance, 500 mW Ptot, SOD-123 package (larger footprint) | Higher power margin supports transient surge handling; incompatible with SOD323 land pattern | Choose only if board redesign accommodates larger pad layout and thermal mass requirements |
Compared with BZX38450-B24X, BZX384-C24 trades voltage accuracy for broader availability and lower cost, while MMSZ5245B offers higher power headroom at the expense of PCB area and leakage performance - making the B24X optimal for miniaturized, low-quiescent, precision-bias applications.
Availability
BZX38450-B24X is available at Aetrix Electronics and suitable for portable sensor biasing, microcontroller reset reference, and low-power RF front-end biasing requiring stable component supply with guaranteed long-term traceability and no last-time-buy risk.
Supply support for BZX38450-B24X 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 essential semiconductors for automotive, industrial, and consumer markets.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered and space-constrained applications demanding minimal leakage, tight tolerance, and stable thermal behavior.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX38450-B24X has a nominal Zener voltage of 24 V with a guaranteed range of 23.5 V to 24.5 V at 50 µA. Its absolute maximum non-repetitive peak reverse voltage is not specified separately; instead, it follows IEC 60134 limiting values - maximum reverse power dissipation is 40 W for 100 µs pulses, implying transient VR capability well above 24 V depending on pulse width and duty cycle.
Can this Zener be used in series or parallel configurations for higher voltage or current handling?
Series connection of BZX38450-B24X devices is not recommended due to mismatched temperature coefficients and leakage currents, which cause uneven voltage division. Parallel use is also discouraged because of thermal runaway risk - the device's positive SZ (+18.2 mV/K) means hotter units draw more current, accelerating failure without active balancing circuitry.
How does the 50 µA test current affect circuit design compared to standard 5 mA Zeners?
Using 50 µA instead of 5 mA reduces required bias resistor value by 100×, enabling >10 MΩ resistor selection - critical for extending battery life in multi-year IoT deployments. However, designers must verify that load current plus Zener current remains within 300 mW derating limits and that rdiff impact on regulation error is acceptable at such low IZ.
Is this part qualified for automotive applications?
No - the BZX38450-B24X is not automotive-qualified. Nexperia explicitly states in its legal disclaimers that unless a product data sheet expressly declares automotive qualification, the device is neither tested nor warranted for automotive use. It lacks AEC-Q200 stress testing and is intended for industrial, consumer, and portable electronics only.
BZX38450-B24X 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):
- 24 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 18.2 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-B24X FAQ
1.How can I place an order for BZX38450-B24X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B24X 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-B24X reliable?
The price and inventory of BZX38450-B24X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B24X is usually 5 days.
3.What payment methods are accepted for BZX38450-B24X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B24X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B24X?
BZX38450-B24X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B24X 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-B24X?
For technical support, including BZX38450-B24X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B24X requirements.
6.How does Aetrix verify that BZX38450-B24X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B24X 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-B24X meets industry standards.
7.What is the process for return or replacement of BZX38450-B24X?
All BZX38450-B24X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B24X, 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-B24X part is unused and in its original packaging.
Return procedure for BZX38450-B24X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B24X 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…
