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Nexperia USA Inc. BZX8450-C3V9VL
- Part No.:
- BZX8450-C3V9VL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C3V9VL.pdf
- Description:
- DIODE ZENER 3.9V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,526
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Product details
Overview
BZX8450-C3V9VL from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers 3.9 V nominal regulation at 50 µA test current, with ±5 % tolerance, 150 Ω typical differential resistance at 5 mA, and 2.5 µA max reverse leakage at VR = 3.9 V - enabling stable operation in portable battery-powered sensors and microcontroller reset circuits.
For engineers reviewing the BZX8450-C3V9VL datasheet, BZX8450-C3V9VL pinout, BZX8450-C3V9VL application, or BZX8450-C3V9VL equivalent, key selection criteria include its low 50 µA regulation current, SOT23 footprint compatibility, 250 mW power rating, and intentional leakage optimization for noise-sensitive analog front-ends.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 3.70 V to 4.10 V at IZ = 50 µA. Its temperature coefficient is −2.7 mV/K, indicating negative drift with rising junction temperature, and it exhibits 150 pF capacitance at VR = 0 V and f = 1 MHz - critical for high-frequency decoupling stability.
The device features a non-connected (n.c.) terminal (Pin 2), isolating internal structure from PCB routing constraints. Its thermal resistance from junction to ambient is 500 K/W on FR4 PCB, limiting continuous dissipation to 250 mW at Tamb ≤ 25 °C per derating curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.9 V (min 3.70 V / max 4.10 V at IZ = 50 µA - defines precise reference point for low-bias circuits) |
| Tolerance | ±5 % (C-series grade - enables cost-effective selection where tight regulation is not required) |
| Differential Resistance | 150 Ω typ. at IZ = 5 mA (low impedance improves load regulation stability under varying current draw) |
| Reverse Leakage Current | 2.5 µA max at VR = 3.9 V (optimized for low-noise, fast-switching applications per AN90031) |
| Power Dissipation | 250 mW max at Tamb ≤ 25 °C (limits thermal rise on standard FR4 PCB with single-sided copper) |
| Forward Voltage | 0.9 V max at IF = 10 mA (ensures predictable forward conduction during transient overvoltage events) |
| Junction Temperature | 150 °C max (supports operation in industrial ambient environments up to +125 °C with proper derating) |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch, 3-terminal configuration with molded notch indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node in reverse-biased Zener configuration; carries forward current during fault conditions |
| 2 | Not Connected (n.c.) | Internally unconnected - must remain floating; no PCB trace or solder mask required |
| 3 | Cathode (K) | Connects to higher-potential node; primary terminal for Zener breakdown voltage reference and heat sinking path |
Key Features
| Feature | Design Value |
|---|---|
| Low Test Current Operation | Specified at 50 µA - enables use in nanoamp-level standby circuits without compromising regulation accuracy |
| Optimized Leakage Profile | Intentional minor IR increase (vs. B-series) reduces switching noise and improves transient response in signal conditioning paths |
| Thermal Performance | Rth(j-a) = 500 K/W on FR4 - allows direct thermal modeling for compact PCB layouts without heatsinks |
| Small-Signal Capacitance | 150 pF at 0 V - maintains high-frequency bypass integrity below 10 MHz without resonance issues |
Applications
| Portable Sensor Biasing | Microcontroller Reset Reference |
|---|---|
Use Scenario: Powering analog sensor ICs (e.g., temperature or humidity transducers) from coin-cell batteries with <10 µA quiescent current. IC Role / Device Role / Timing Role: Provides stable 3.9 V reference for ADC reference input and op-amp bias rails. Use Value: Enables accurate 12-bit sensor readings across −40 °C to +85 °C with <0.5 % total error due to low tempco and minimal self-heating. | Use Scenario: Generating reliable reset threshold for 3.3 V microcontrollers in wearables and IoT edge nodes. IC Role / Device Role / Timing Role: Acts as precision voltage threshold detector in RC-based reset generator circuits. Use Value: Guarantees deterministic reset assertion at 3.9 V ±5 %, eliminating false resets during brown-out recovery. |
| Low-Power RF Front-End Bias | Industrial Signal Conditioning |
Use Scenario: Supplying gate bias to discrete LNA transistors in sub-GHz ISM band receivers. IC Role / Device Role / Timing Role: Delivers ultra-low-noise DC bias while minimizing phase noise contribution via optimized leakage profile. Use Value: Reduces close-in phase noise by 3 dB compared to standard Zeners, improving receiver sensitivity by 0.8 dB. | Use Scenario: Providing reference voltage for 4–20 mA transmitter loop-powered sensors in factory automation. IC Role / Device Role / Timing Role: Serves as shunt regulator in two-wire current loop interface, absorbing excess loop current above 20 mA. Use Value: Maintains 3.9 V regulation across 12–36 V loop supply range with <2 % output variation, ensuring DAC linearity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V9 | Same 3.9 V nominal, ±5 % tolerance, but rated for 300 mW Ptot and uses legacy SOT23 footprint with different thermal pad layout | Higher power margin supports 10 mA continuous Zener current; less suitable for space-constrained PCBs requiring strict SOT23-3 compliance | Select when board layout accommodates larger thermal relief or when >250 mW dissipation headroom is needed |
| MMSZ4684 | 3.9 V, ±5 %, but specified at 20 mA test current and has 100 Ω rdiff - higher bias current requirement and tighter regulation at higher loads | Designed for general-purpose regulation rather than ultra-low-current biasing; exhibits higher leakage (5 µA) at VR = 3.9 V | Select only if circuit can sustain 20 µA minimum Zener current and requires lower dynamic impedance under load |
Compared with BZX84-C3V9 and MMSZ4684, BZX8450-C3V9VL uniquely balances ultra-low 50 µA test current, SOT23-3 pinout compliance, and noise-optimized leakage - making it optimal for battery-critical, space-constrained, and low-noise analog designs.
Availability
BZX8450-C3V9VL 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 across extended temperature ranges and long production lifecycles.
Supply support for BZX8450-C3V9VL 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 - delivering robust, scalable components for consumer, industrial, and automotive markets.
The BZX8450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered and noise-sensitive applications where minimal bias current, tight thermal behavior, and repeatable voltage reference are essential.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX8450-C3V9VL is a Zener diode designed to operate in controlled reverse breakdown. Its nominal Zener voltage is 3.9 V, with guaranteed breakdown between 3.70 V and 4.10 V at 50 µA. It is not rated for blocking higher reverse voltages - applying >4.10 V continuously risks exceeding its 250 mW power limit and causing thermal runaway.
Does Pin 2 require PCB connection or grounding?
No - Pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia datasheet. It is internally unconnected and must remain electrically floating on the PCB. Routing traces, vias, or solder mask to this terminal may compromise mechanical reliability or cause unintended parasitic coupling.
How does the −2.7 mV/K temperature coefficient affect circuit performance?
The negative temperature coefficient means the Zener voltage decreases by approximately 2.7 mV per degree Celsius rise in junction temperature. In a 3.9 V reference, this yields ~−0.07 %/°C drift - acceptable for non-precision applications but requires compensation in high-accuracy systems operating across −40 °C to +125 °C ambient ranges.
Can this diode be used in forward conduction mode like a standard silicon diode?
Yes - its forward voltage is specified at ≤0.9 V at 10 mA, matching typical silicon diode behavior. However, it is not optimized for rectification: its 200 mA absolute maximum forward current and lack of surge rating make it unsuitable for power conversion. Use only for low-current clamping or protection where Zener action is secondary.
BZX8450-C3V9VL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX8450
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 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:
- TO-236AB
BZX8450-C3V9VL FAQ
1.How can I place an order for BZX8450-C3V9VL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C3V9VL 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 BZX8450-C3V9VL reliable?
The price and inventory of BZX8450-C3V9VL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C3V9VL is usually 5 days.
3.What payment methods are accepted for BZX8450-C3V9VL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C3V9VL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C3V9VL?
BZX8450-C3V9VL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C3V9VL 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 BZX8450-C3V9VL?
For technical support, including BZX8450-C3V9VL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C3V9VL requirements.
6.How does Aetrix verify that BZX8450-C3V9VL is sourced from the original manufacturer or authorized distributors?
All BZX8450-C3V9VL 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 BZX8450-C3V9VL meets industry standards.
7.What is the process for return or replacement of BZX8450-C3V9VL?
All BZX8450-C3V9VL units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C3V9VL, 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 BZX8450-C3V9VL part is unused and in its original packaging.
Return procedure for BZX8450-C3V9VL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C3V9VL 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
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