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Nexperia USA Inc. BZX38450-C3V3X
- Part No.:
- BZX38450-C3V3X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C3V3X.pdf
- Description:
- DIODE ZENER 3.3V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:20,630
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Product details
Overview
BZX38450-C3V3X 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 3.3 V regulation at 50 µA test current, with ±2 % tolerance, 160 Ω differential resistance at 5 mA, and 1.5 µA max reverse leakage at 2.5 V, enabling stable operation in portable battery-powered sensors and microcontroller reset circuits.
For engineers reviewing the BZX38450-C3V3X datasheet, BZX38450-C3V3X pinout, BZX38450-C3V3X application, or BZX38450-C3V3X equivalent, key selection criteria include its 3.3 V nominal Zener voltage, 50 µA low-current regulation point, ±2 % tolerance grade, SOD323 footprint compatibility, and optimized leakage profile for noise-sensitive analog front-ends.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining a stable 3.3 V reference across its cathode–anode terminals under reverse-bias conditions. Its regulation is specified at IZ = 50 µA - significantly lower than standard Zeners - making it suitable for micropower systems where quiescent current must remain below 100 µA.
The BZX38450-C3V3X belongs to the "C" tolerance series (±2 %), features a temperature coefficient of −3.5 mV/K, and exhibits 160 pF capacitance at 0 V and 1 MHz. Its intentional minor leakage rise improves switching speed and reduces high-frequency noise in feedback paths compared to standard B-series variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.13 V to 3.47 V at IZ = 50 µA - tight ±2 % tolerance enables accurate low-current reference without trimming. |
| Differential Resistance (rdiff) | 160 Ω max at IZ = 5 mA - ensures minimal output voltage shift under small load variations in bias networks. |
| Reverse Leakage (IR) | 1.5 µA max at VR = 2.5 V - low leakage preserves battery life in always-on sensor nodes and sleep-mode circuits. |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - supports use as clamping diode or dual-purpose protection/reference element. |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on FR4 PCB - defines safe continuous operating envelope for surface-mount thermal design. |
| Junction-to-Ambient Rth | 415 K/W - informs thermal derating requirements when ambient exceeds 25 °C in enclosed industrial enclosures. |
Pinout & Package
SOD323 (SC-76) plastic surface-mount 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 (K) | Cathode | Connected to regulated voltage node; marking bar identifies this terminal - critical for correct orientation in low-voltage bias rails. |
| 2 (A) | Anode | Connected to ground or lower-potential rail; forms shunt path to sink regulation current during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Low test current regulation | Specified at 50 µA - enables stable reference generation in sub-100 µA supply domains such as RTC backup or wake-up comparators. |
| ±2 % voltage tolerance (C series) | Tighter than standard ±5 % parts - eliminates need for external trimming in factory-calibrated sensor signal chains. |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces high-frequency noise and improves transient response in op-amp reference inputs. |
| Small SOD323 footprint | 1.7 mm × 1.25 mm area - saves board space in wearables, hearing aids, and multi-rail PMIC monitoring circuits. |
Applications
| Microcontroller Reset Circuit | Low-Power Sensor Biasing |
|---|---|
Use Scenario: Providing clean, stable 3.3 V reference to a reset supervisor IC (e.g., MAX809) in an ARM Cortex-M0+ system powered by coin cell. IC Role / Device Role / Timing Role: Shunt Zener regulator establishing precise threshold voltage for power-on reset assertion timing. Use Value: ±2 % tolerance ensures reset deassertion occurs within 3.23–3.47 V window, preventing premature release or extended hold time. |
Use Scenario: Supplying bias current to a MEMS pressure sensor's Wheatstone bridge in a wireless environmental monitor. IC Role / Device Role / Timing Role: Low-leakage voltage reference source delivering stable excitation voltage independent of battery discharge curve. Use Value: 1.5 µA max leakage at 2.5 V minimizes error contribution in µA-level bridge currents, preserving 12-bit ADC accuracy. |
| ADC Reference Stabilization | USB-C Port Voltage Clamp |
Use Scenario: Decoupling and stabilizing the internal reference of a SAR ADC (e.g., ADS7953) in a battery-operated data logger. IC Role / Device Role / Timing Role: Passive shunt regulator filtering supply ripple and suppressing high-frequency noise on VREF line. Use Value: 160 pF capacitance at 0 V and −3.5 mV/K tempco suppresses >100 kHz noise while limiting thermal drift to <10 mV over −40 to +85 °C. |
Use Scenario: Clamping VBUS detection line in USB-C peripheral to prevent false overvoltage trips during hot-plug transients. IC Role / Device Role / Timing Role: Fast-response Zener clamp absorbing short-duration surges while maintaining DC bias integrity. Use Value: Optimized leakage profile enables faster turn-on than standard Zeners, reducing clamp delay to <100 ns for 10 V/µs transients. |
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-B3V3 | ±5 % tolerance, higher rdiff (600 Ω), no optimized leakage profile | Acceptable for non-critical biasing where cost is primary concern and 3.14–3.46 V range suffices | Select only if ±5 % tolerance and higher dynamic impedance are acceptable in the target circuit. |
| MMSZ4685T1G | Same 3.3 V nominal, ±5 %, 350 mW Ptot, SOD-123 package (larger footprint) | Higher power margin but incompatible with dense SOD323 layouts; slightly higher leakage (3 µA) | Choose when thermal headroom >300 mW is required or legacy SOD-123 layout reuse is prioritized. |
Compared with BZX38450-C3V3X, the BZX384-B3V3 trades precision for cost and the MMSZ4685T1G trades miniaturization for thermal robustness - neither matches its combination of ±2 % tolerance, SOD323 size, and low-leakage noise optimization.
Availability
BZX38450-C3V3X is available at Aetrix Electronics and suitable for portable medical monitors, IoT endpoint sensors, and ultra-low-power microcontroller subsystems requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX38450-C3V3X 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 battery-constrained applications demanding stable voltage references at microampere bias levels.
FAQ
What is the maximum continuous reverse power dissipation for BZX38450-C3V3X?
The device is rated for 300 mW total power dissipation at ambient temperatures ≤25 °C when mounted on a standard FR4 PCB with single-sided copper. Derating is required above 25 °C at 2.4 mW/°C based on its 415 K/W junction-to-ambient thermal resistance.
Can BZX38450-C3V3X be used in forward conduction mode?
Yes - it functions as a standard silicon diode in forward bias, with a maximum forward voltage of 0.9 V at 10 mA. This allows dual-use in circuits requiring both clamping and low-drop rectification, though its primary design intent remains reverse-bias Zener regulation.
How does the "C" suffix differ from "B" in the BZX38450 series?
The "C" suffix denotes ±2 % Zener voltage tolerance and an intentionally modified leakage profile optimized for fast switching and reduced noise, whereas "B" parts offer ±5 % tolerance and conventional leakage behavior per standard Zener specifications.
Is BZX38450-C3V3X suitable for automotive applications?
No - this part is not AEC-Q200 qualified and lacks automotive-grade screening, temperature validation, or stress testing. Nexperia explicitly states non-automotive qualification in its legal disclaimers; use only in industrial, consumer, or medical applications meeting its −55 °C to +150 °C operating range.
BZX38450-C3V3X 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):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 1.5 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-C3V3X FAQ
1.How can I place an order for BZX38450-C3V3X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C3V3X 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-C3V3X reliable?
The price and inventory of BZX38450-C3V3X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C3V3X is usually 5 days.
3.What payment methods are accepted for BZX38450-C3V3X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C3V3X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C3V3X?
BZX38450-C3V3X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C3V3X 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-C3V3X?
For technical support, including BZX38450-C3V3X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C3V3X requirements.
6.How does Aetrix verify that BZX38450-C3V3X is sourced from the original manufacturer or authorized distributors?
All BZX38450-C3V3X 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-C3V3X meets industry standards.
7.What is the process for return or replacement of BZX38450-C3V3X?
All BZX38450-C3V3X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C3V3X, 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-C3V3X part is unused and in its original packaging.
Return procedure for BZX38450-C3V3X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C3V3X 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
Diodes Incorporated
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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
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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