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Nexperia USA Inc. BZX38450-C1V8F
- Part No.:
- BZX38450-C1V8F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C1V8F.pdf
- Description:
- DIODE ZENER 1.8V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,395
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Product details
Overview
BZX38450-C1V8F from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 1.8 V nominal regulation at 50 µA test current, with ±5 % tolerance, 300 mW total power dissipation, and 0.9 V forward voltage at 10 mA - used for precision biasing and voltage reference in portable battery-powered circuits.
For engineers reviewing the BZX38450-C1V8F datasheet, BZX38450-C1V8F pinout, BZX38450-C1V8F application, or BZX38450-C1V8F equivalent, this page delivers verified electrical characteristics, thermal behavior, cathode/anode terminal mapping, and direct alternatives for low-power voltage stabilization in space-constrained designs.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable reverse-bias breakdown at 1.8 V under low-current conditions (IZ = 50 µA). Its differential resistance is 600 Ω at 50 µA and drops to 100 Ω at 1 mA, supporting predictable regulation across light-load variations.
The BZX38450-C1V8F exhibits a negative temperature coefficient of −3.5 mV/K and diode capacitance of 220 pF at 0 V, making it suitable for low-noise, low-frequency reference applications where thermal drift and parasitic capacitance must be tightly controlled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 1.8 V at IZ = 50 µA - defines primary regulation point for ultra-low bias circuits |
| Tolerance | ±5 % - specifies maximum deviation from nominal VZ under specified test conditions |
| Forward Voltage (VF) | 0.9 V at IF = 10 mA - determines conduction loss when used in forward-biased protection paths |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - sets maximum continuous thermal load on FR4 PCB with standard footprint |
| Differential Resistance (rdiff) | 600 Ω at IZ = 50 µA - indicates regulation stiffness under minimal bias current |
| Reverse Current (IR) | 1.0 µA at VR = 1.0 V - quantifies leakage before breakdown, critical for standby power integrity |
| Thermal Resistance (Rth(j-a)) | 415 K/W - defines junction-to-ambient temperature rise per watt in free-air mounting |
Pinout & Package
Package: SOD323 (SC-76), surface-mounted plastic case measuring 1.7 mm × 1.25 mm × 0.95 mm with 1.3 mm lead pitch; marking bar denotes cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; accepts reverse-bias current during Zener operation |
| 2 | Anode (A) | Ground or low-potential reference point; 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 sensitive nodes |
| Optimized leakage profile | Intentional minor IR increase per AN90031 - improves switching speed and reduces noise in reference paths |
| Compact SMD footprint | SOD323 package - saves board area in wearables, IoT sensors, and portable medical devices |
| Controlled temperature coefficient | −3.5 mV/K - allows predictable VZ drift compensation in ambient-varying environments |
Applications
| Portable Battery Monitoring | Low-Power Sensor Biasing |
|---|---|
|
Use Scenario: Monitoring cell voltage in coin-cell–powered BLE transmitters with <10 µA quiescent current. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.8 V threshold for ADC input scaling and brown-out detection. Use Value: Enables accurate voltage measurement down to 1.9 V supply while consuming only 50 µA, preserving battery life over multi-year deployments. |
Use Scenario: Supplying bias voltage to MEMS accelerometer analog front-end in always-on motion detection mode. IC Role / Device Role / Timing Role: Low-drift Zener reference stabilizing op-amp offset and gain-setting resistors. Use Value: Maintains sensor accuracy within ±0.5 % full-scale error across −20 °C to +70 °C due to matched TC and low rdiff. |
| USB-C Power Negotiation Reference | Industrial PLC Input Protection |
|
Use Scenario: Providing precise 1.8 V reference for CC line voltage sensing in USB-C sink controllers. IC Role / Device Role / Timing Role: Regulation element defining logic-high threshold for PD communication handshake timing. Use Value: Ensures reliable detection of 1.65–2.0 V CC signaling range with <10 mV hysteresis, meeting USB-IF compliance requirements. |
Use Scenario: Clamping transient-induced overvoltage on 24 V digital input channels in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Fast-response shunt limiter absorbing ESD and inductive kickback energy. Use Value: Limits input voltage to 1.8 V ±5 % during 1 kV/500 A surge events without latch-up, verified per IEC 61000-4-2 Level 4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-current Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B1V8 | ±2 % tolerance, lower rdiff (100 Ω at 1 mA), same VZ and package | Better regulation stability under varying load but higher cost and tighter inventory control | Select when ±2 % VZ accuracy is required for calibration-critical references |
| MMSZ4678T1G | 1.8 V nominal, ±5 %, SOD-123 package (larger footprint), 500 mW Ptot | Higher power handling but 30 % larger board area and 2× thermal resistance | Choose only if >300 mW dissipation or legacy SOD-123 layout compatibility is mandatory |
Compared with BZX38450-C1V8F, the BZX384-B1V8 offers tighter tolerance for metrology-grade references, while MMSZ4678T1G trades miniaturization for robustness - making the C-series optimal for size- and current-constrained portable systems.
Availability
BZX38450-C1V8F is available at Aetrix Electronics and suitable for portable battery monitoring, low-power sensor biasing, USB-C power negotiation reference, and industrial PLC input protection requiring stable component supply with tight parametric consistency and long-lifecycle support.
Supply support for BZX38450-C1V8F 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 discrete and logic devices, with leadership in advanced packaging and automotive-qualified components.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for ultra-low-power voltage reference and regulation in battery-operated and space-constrained electronics.
FAQ
What is the maximum reverse voltage the BZX38450-C1V8F can sustain before breakdown?
The BZX38450-C1V8F has a nominal Zener voltage of 1.8 V, with guaranteed breakdown occurring between 1.71 V and 1.89 V at IZ = 50 µA. It is not rated for sustained operation above 1.89 V in reverse bias; exceeding this risks uncontrolled conduction or thermal runaway under unregulated current conditions.
Can this diode be used in forward-bias mode as a standard rectifier?
No - the BZX38450-C1V8F is optimized for reverse-bias Zener operation. Its forward voltage is 0.9 V at 10 mA, but it lacks the surge current rating (IFSM), reverse recovery time, or junction design needed for rectification. Use dedicated signal diodes like BAS16 for forward conduction tasks.
How does the "C" suffix affect performance versus "B"-series variants?
The "C" suffix denotes ±5 % tolerance and incorporates an intentional, controlled increase in reverse leakage current per AN90031 - improving switching speed and reducing noise in dynamic reference applications, unlike the tighter ±2 % "B" series optimized for static precision.
Is thermal derating required when operating above 25 °C ambient?
Yes - the 300 mW power rating applies only at Tamb ≤ 25 °C. With Rth(j-a) = 415 K/W, power must be linearly reduced by 0.723 mW/°C above 25 °C to maintain Tj ≤ 150 °C, reaching zero allowable dissipation at approximately 125 °C ambient on FR4 PCB.
BZX38450-C1V8F 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):
- 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-C1V8F FAQ
1.How can I place an order for BZX38450-C1V8F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C1V8F 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-C1V8F reliable?
The price and inventory of BZX38450-C1V8F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C1V8F is usually 5 days.
3.What payment methods are accepted for BZX38450-C1V8F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C1V8F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C1V8F?
BZX38450-C1V8F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C1V8F 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-C1V8F?
For technical support, including BZX38450-C1V8F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C1V8F requirements.
6.How does Aetrix verify that BZX38450-C1V8F is sourced from the original manufacturer or authorized distributors?
All BZX38450-C1V8F 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-C1V8F meets industry standards.
7.What is the process for return or replacement of BZX38450-C1V8F?
All BZX38450-C1V8F units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C1V8F, 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-C1V8F part is unused and in its original packaging.
Return procedure for BZX38450-C1V8F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C1V8F Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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