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Nexperia USA Inc. BZX38450-C3V9X
- Part No.:
- BZX38450-C3V9X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C3V9X.pdf
- Description:
- DIODE ZENER 3.9V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:770
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Product details
Overview
BZX38450-C3V9X 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 3.9 V regulation at 50 µA test current, with ±2 % tolerance, 600 Ω differential resistance at 5 mA, and 2.0 µA max reverse current at VR = 3.0 V - enabling stable operation in portable battery-powered sensor nodes and microcontroller reset circuits.
For engineers reviewing the BZX38450-C3V9X datasheet, BZX38450-C3V9X pinout, BZX38450-C3V9X application, or BZX38450-C3V9X equivalent, key selection criteria include its low 50 µA test current specification, tight ±2 % tolerance, SOD323 footprint compatibility, and optimized leakage profile 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, exhibiting a temperature coefficient of −2.7 mV/K and diode capacitance of 150 pF at VR = 0 V, f = 1 MHz. Its thermal resistance from junction to ambient is 415 K/W on FR4 PCB, supporting reliable operation up to 150 °C junction temperature.
The device features intentional minor leakage rise per AN90031 to improve switching speed and reduce noise in low-current regulation paths. It is rated for 300 mW total power dissipation at Tamb ≤ 25 °C and withstands non-repetitive peak reverse power up to 40 W for 100 µs pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.9 V at IZ = 50 µA - sets precise reference point for low-bias analog circuits |
| Voltage Tolerance | ±2 % - ensures tight regulation across production batches without trimming |
| Differential Resistance | 600 Ω max at IZ = 5 mA - defines output impedance and load regulation sensitivity |
| Reverse Current | 2.0 µA max at VR = 3.0 V - enables ultra-low quiescent current in always-on monitoring circuits |
| Forward Voltage | 0.9 V max at IF = 10 mA - supports predictable forward conduction during transient clamping |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - defines maximum steady-state thermal envelope on standard FR4 PCB |
| Junction Temperature | −55 °C to +150 °C - allows deployment in extended industrial environments |
Pinout & Package
Package: SOD323 (SC-76), surface-mounted plastic package; 2 leads; 1.3 mm pitch; 1.7 mm × 1.25 mm × 0.95 mm body. Cathode identified by marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated voltage node; polarity must be observed for correct Zener operation |
| 2 | Anode (A) | Connected to ground or lower potential; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - minimizes standby current draw in battery-critical applications |
| Tight voltage tolerance | ±2 % - eliminates need for post-assembly calibration in precision reference designs |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces high-frequency noise and improves transient response |
| Small-footprint packaging | SOD323 (1.7 mm × 1.25 mm) - enables high-density layout in space-constrained wearables and IoT modules |
| Thermal robustness | Rth(j-a) = 415 K/W on FR4 - supports continuous operation without heatsinking in ambient temperatures up to +85 °C |
Applications
| Microcontroller Reset Circuit | Portable Sensor Biasing |
|---|---|
Use Scenario: Providing clean, stable reset threshold for ARM Cortex-M0+ microcontrollers in coin-cell–powered environmental sensors. IC Role / Device Role / Timing Role: Zener voltage reference establishing 3.9 V reset trip point for integrated POR circuitry. Use Value: Enables guaranteed reset assertion down to 2.2 V supply while consuming <1 µA quiescent current. |
Use Scenario: Supplying bias voltage to MEMS pressure transducer amplifier stages in wearable health monitors. IC Role / Device Role / Timing Role: Low-noise voltage reference source for op-amp input stage, replacing larger LDOs. Use Value: Delivers 3.9 V ±2 % stability with 150 pF capacitance that suppresses RF coupling into analog signal chain. |
| IoT Node Voltage Reference | Low-Power ADC Reference |
Use Scenario: Generating stable reference for 12-bit SAR ADC in NB-IoT asset trackers operating on Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Precision shunt reference replacing external bandgap ICs in cost-sensitive designs. Use Value: Maintains 0.5 LSB error over −40 °C to +85 °C due to −2.7 mV/K tempco and low rdiff. |
Use Scenario: Setting full-scale reference for sigma-delta ADC in battery-operated gas detection modules. IC Role / Device Role / Timing Role: Shunt regulator providing 3.9 V reference to ADC REF+ input with minimal dynamic loading. Use Value: 600 Ω differential resistance ensures <0.01 % reference droop during 10 µA ADC sampling bursts. |
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-B3V9 | Same 3.9 V nominal, but ±5 % tolerance and higher 5.0 µA IR at VR = 3.0 V | Acceptable where cost priority outweighs precision; less suitable for sub-1 µA standby systems | Select when tighter tolerance is unnecessary and legacy B-series footprint compatibility is required |
| MMSZ4684T1G | 3.9 V nominal, ±5 %, 100 Ω rdiff at 5 mA, 100 pF Cd, SOD-123 package (2.7 mm × 1.6 mm) | Larger footprint and higher leakage (5 µA) limit use in ultra-miniaturized designs | Choose only if board layout already accommodates SOD-123 and higher dynamic current capability is needed |
Compared with BZX38450-C3V9X, the BZX384-B3V9 trades precision for cost and the MMSZ4684T1G offers lower impedance but requires more PCB area and draws more leakage - making the C3V9X optimal for miniaturized, battery-limited systems demanding ±2 % accuracy and sub-2 µA standby current.
Availability
BZX38450-C3V9X is available at Aetrix Electronics and suitable for microcontroller reset circuits, portable sensor biasing, IoT node voltage references, and low-power ADC references requiring stable component supply across long-life deployments.
Supply support for BZX38450-C3V9X 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 leading global semiconductor company headquartered in Nijmegen, Netherlands, specializing in high-volume, high-reliability discrete and logic devices for automotive, industrial, and consumer markets.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for ultra-low-power voltage regulation and reference applications in battery-constrained and space-sensitive electronics.
FAQ
What is the maximum continuous power dissipation for BZX38450-C3V9X at 70 °C ambient?
At Tamb = 70 °C, derating applies from the 300 mW rating at 25 °C using Rth(j-a) = 415 K/W. The allowable power is reduced to approximately 195 mW, calculated as P = (150 °C − 70 °C) / 415 K/W. This ensures junction temperature remains within the 150 °C absolute maximum limit under steady-state conditions on standard FR4 PCB.
Can BZX38450-C3V9X be used in place of a 3.3 V Zener diode?
No - BZX38450-C3V9X is strictly a 3.9 V device with a minimum Zener voltage of 3.70 V at IZ = 50 µA. Substituting it for a 3.3 V Zener would result in incorrect biasing or failure to trigger regulation thresholds. For 3.3 V, the correct variant is BZX38450-C3V3 (3.13 V to 3.47 V range).
Does the "C" suffix indicate automotive qualification?
No - the "C" in BZX38450-C3V9X denotes the ±2 % voltage tolerance grade, not automotive qualification. This part is not AEC-Q200 qualified and is intended for industrial and consumer applications. Nexperia explicitly states in its legal disclaimers that non-automotive qualified products are unsuitable for safety-critical or automotive use.
How does the intentional leakage rise affect circuit noise performance?
Per application note AN90031, the controlled increase in reverse leakage current improves carrier sweep-out speed during turn-off, reducing minority-carrier storage time and associated switching transients. This directly lowers broadband noise generation in high-impedance reference nodes - verified by reduced 1/f noise and faster settling in precision analog measurement circuits.
BZX38450-C3V9X 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):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 300 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:
- SOD-323
BZX38450-C3V9X FAQ
1.How can I place an order for BZX38450-C3V9X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C3V9X 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-C3V9X reliable?
The price and inventory of BZX38450-C3V9X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C3V9X is usually 5 days.
3.What payment methods are accepted for BZX38450-C3V9X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C3V9X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C3V9X?
BZX38450-C3V9X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C3V9X 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-C3V9X?
For technical support, including BZX38450-C3V9X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C3V9X requirements.
6.How does Aetrix verify that BZX38450-C3V9X is sourced from the original manufacturer or authorized distributors?
All BZX38450-C3V9X 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-C3V9X meets industry standards.
7.What is the process for return or replacement of BZX38450-C3V9X?
All BZX38450-C3V9X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C3V9X, 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-C3V9X part is unused and in its original packaging.
Return procedure for BZX38450-C3V9X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C3V9X Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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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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