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Nexperia USA Inc. BZX38450-C1V8X
- Part No.:
- BZX38450-C1V8X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C1V8X.pdf
- Description:
- DIODE ZENER 1.8V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:24,615
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Product details
Overview
BZX38450-C1V8X 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 1.8 V regulation at 50 µA test current, with ±5 % tolerance, 600 Ω differential resistance at 5 mA, and 220 pF capacitance at 0 V - ideal for portable battery-powered sensor nodes and microcontroller reset circuits.
For engineers reviewing the BZX38450-C1V8X datasheet, BZX38450-C1V8X pinout, BZX38450-C1V8X application, or BZX38450-C1V8X equivalent, this page provides verified electrical characteristics, thermal behavior, SOD323 footprint details, and real-world use cases for low-current regulation in space-constrained designs.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable reverse-bias voltage across its cathode-anode terminals under varying load conditions. Its specified regulation at 50 µA enables operation in sub-100 µA bias networks, while intentional leakage optimization supports fast switching transients and reduced noise coupling in analog front-ends.
The BZX38450-C1V8X exhibits a negative temperature coefficient of −3.5 mV/K and junction-to-ambient thermal resistance of 415 K/W on FR4 PCB, limiting power dissipation to 300 mW at ≤25 °C ambient. Its 0.9 V forward voltage at 10 mA ensures predictable turn-on behavior during polarity-sensitive protection schemes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ (Nominal) | 1.8 V - precise reference voltage at 50 µA test current for low-power biasing |
| Tolerance | ±5 % - tighter than standard Zeners for improved system-level accuracy without trimming |
| rdiff | 600 Ω max at 5 mA - defines regulation slope and output impedance in feedback paths |
| Cd | 220 pF at 0 V - impacts high-frequency stability in oscillator or filter reference nodes |
| Ptot | 300 mW max at Tamb ≤ 25 °C - sets maximum continuous power handling on standard FR4 PCB |
| IR | 1.0 µA max at VR = 1.0 V - quantifies leakage-induced error in high-impedance sensing rails |
| Rth(j-a) | 415 K/W - determines junction temperature rise under steady-state bias, critical for long-term reliability |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package: 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, marking bar denotes cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated voltage node; marking bar identifies this terminal for correct PCB orientation |
| 2 (A) | Anode | Connected to ground or lower-potential rail; completes shunt regulation path during reverse breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in nanoampere-scale bias networks without compromising regulation accuracy |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching noise and improves transient response in digital I/O protection |
| Thermal performance | Rth(j-sp) = 110 K/W to cathode solder point - supports localized thermal management in dense layouts |
| Robust surge rating | 40 W non-repetitive peak reverse power at 100 µs - withstands ESD and inductive kick events in sensor interfaces |
Applications
| Microcontroller Reset Circuit | Portable Sensor Biasing |
|---|---|
Use Scenario: Providing clean, stable 1.8 V reference to reset ICs in ultra-low-power IoT edge nodes powered by coin cells. IC Role / Device Role / Timing Role: Shunt voltage reference establishing threshold for reset assertion during brown-out conditions. Use Value: 50 µA regulation current minimizes battery drain while 220 pF capacitance avoids oscillation in RC timing networks. |
Use Scenario: Biasing analog front-end amplifiers and ADC references in wearable health monitors operating from single-cell Li-ion. IC Role / Device Role / Timing Role: Precision voltage clamp stabilizing supply rail for signal conditioning stages. Use Value: ±5 % tolerance ensures consistent gain calibration across production units without post-manufacture trimming. |
| Low-Power Oscillator Reference | ESD-Sensitive Interface Protection |
Use Scenario: Supplying regulated voltage to crystal oscillator buffer stages in Bluetooth LE modules where supply ripple must be <10 mV. IC Role / Device Role / Timing Role: Low-noise DC reference source minimizing phase jitter in clock generation paths. Use Value: Optimized leakage profile per AN90031 suppresses broadband noise coupling into sensitive oscillator nodes. |
Use Scenario: Clamping I/O lines in industrial RS-485 transceivers exposed to ±8 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Fast-responding shunt protector diverting surge current away from IC inputs. Use Value: 40 W non-repetitive surge rating absorbs transient energy while 0.9 V forward voltage ensures safe forward conduction during polarity reversal. |
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-B1V8 | ±2 % tolerance, 100 Ω rdiff at 5 mA, 1.0 µA IR at 1.0 V | Higher accuracy and lower dynamic impedance - suited for precision analog references | Select when regulation stability under variable load is prioritized over ultra-low bias current |
| MMSZ4678T1G | 1.8 V nominal, ±5 %, 300 mW, SOD-123 package (2.7 mm × 1.6 mm), 150 Ω rdiff | Larger footprint and higher thermal resistance - less suitable for ultra-dense PCBs | Choose only if SOD-123 is already standardized in the design and board area is not constrained |
Compared with BZX38450-C1V8X, the BZX384-B1V8 offers tighter tolerance and lower impedance but requires higher bias current, while the MMSZ4678T1G trades miniaturization for easier handling and thermal margin - making the C1V8X optimal for space- and current-limited applications.
Availability
BZX38450-C1V8X is available at Aetrix Electronics and suitable for portable sensor nodes, microcontroller reset circuits, and low-power oscillator references requiring stable component supply with tight parametric consistency across production batches.
Supply support for BZX38450-C1V8X 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 solutions 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 quiescent current and robust thermal behavior in miniature packages.
FAQ
What is the maximum continuous reverse voltage that BZX38450-C1V8X can regulate without degradation?
The device regulates continuously up to its nominal Zener voltage of 1.8 V with ±5 % tolerance, meaning it maintains stable breakdown between 1.71 V and 1.89 V at 50 µA. Exceeding 1.89 V under sustained bias risks exceeding its 300 mW power limit on standard FR4 PCB, potentially causing thermal runaway or parameter shift.
Can BZX38450-C1V8X be used in forward-bias mode as a standard diode?
Yes - its forward voltage is specified at 0.9 V maximum at 10 mA, matching typical silicon diode behavior. However, it is not optimized for 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 above 1 mA.
How does the "C" suffix in BZX38450-C1V8X affect its electrical behavior versus "B"-suffix variants?
The "C" suffix denotes the ±5 % tolerance grade with intentionally elevated leakage current (1.0 µA max at 1.0 V vs. 0.8 µA for "B") to improve switching speed and reduce noise. This trade-off enhances performance in dynamic bias and transient suppression roles but slightly increases static power in always-on reference nodes.
Is the SOD323 footprint for BZX38450-C1V8X compatible with reflow and wave soldering processes?
Yes - Nexperia provides validated reflow (Fig. 10) and wave (Fig. 11) soldering footprints for SOD323, including solder land dimensions, solder resist openings, and paste stencil recommendations. The 1.3 mm pitch and 0.4 mm electrode width support both lead-free reflow profiles and selective wave soldering with proper conveyor orientation.
BZX38450-C1V8X 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):
- 1.8 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 1 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-C1V8X FAQ
1.How can I place an order for BZX38450-C1V8X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C1V8X 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-C1V8X reliable?
The price and inventory of BZX38450-C1V8X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C1V8X is usually 5 days.
3.What payment methods are accepted for BZX38450-C1V8X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C1V8X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C1V8X?
BZX38450-C1V8X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C1V8X 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-C1V8X?
For technical support, including BZX38450-C1V8X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C1V8X requirements.
6.How does Aetrix verify that BZX38450-C1V8X is sourced from the original manufacturer or authorized distributors?
All BZX38450-C1V8X 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-C1V8X meets industry standards.
7.What is the process for return or replacement of BZX38450-C1V8X?
All BZX38450-C1V8X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C1V8X, 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-C1V8X part is unused and in its original packaging.
Return procedure for BZX38450-C1V8X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C1V8X Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
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MMSZ5231B-7-F
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Diodes Incorporated
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onsemi
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SMAZ12-13-F
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