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Nexperia USA Inc. BZX8450-C43VL
- Part No.:
- BZX8450-C43VL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C43VL.pdf
- Description:
- DIODE ZENER 43V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,595
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Product details
Overview
BZX8450-C43VL from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and biasing in portable electronics. It delivers a nominal 43 V regulation at 50 µA test current, with ±5 % tolerance, 375 Ω differential resistance at 2 mA, and 0.05 µA reverse current at rated voltage - optimized for battery-powered sensor nodes and low-power microcontroller reset circuits.
For engineers reviewing the BZX8450-C43VL datasheet, BZX8450-C43VL pinout, BZX8450-C43VL application, or BZX8450-C43VL equivalent, this page provides verified electrical parameters, thermal resistance (330 K/W to solder point), SOT23 terminal mapping, and real-world use cases in voltage clamping, reference generation, and overvoltage protection for 3.3 V/5 V embedded systems.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 40.85 V to 45.15 V at 2 mA test current. Its temperature coefficient is +0.05 mV/K, indicating near-zero drift across ambient temperatures, and it exhibits 40 pF capacitance at 0 V bias and 1 MHz - critical for high-frequency noise suppression in analog front-ends.
The device uses intentional minor leakage optimization per AN90031 to reduce switching noise and improve transient response. With a maximum non-repetitive peak reverse power dissipation of 40 W (100 µs pulse), it supports surge immunity in low-energy protection circuits without requiring external series limiting resistors beyond standard biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage (VZ) | 40.85 V to 45.15 V at IZ = 2 mA - defines stable reference window for 43 V nominal operation |
| Tolerance | ±5 % - enables cost-effective selection where tight regulation is not required |
| Differential Resistance (rdiff) | 375 Ω at IZ = 2 mA - determines output impedance and load regulation error |
| Reverse Current (IR) | 0.05 µA at VR = 43 V - ensures ultra-low standby power in always-on monitoring circuits |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - supports reliable anode-cathode conduction during fault conditions |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum continuous bias current limit (~5.8 mA at 43 V) |
| Thermal Resistance (Rth(j-sp)) | 330 K/W to cathode solder point - informs PCB copper area requirements for thermal management |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, single-sided FR4 mounting with 70 µm tin-plated copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node; reverse-biased during regulation; must be held ≤ VZ below cathode |
| 2 | Not Connected (n.c.) | Electrically isolated internal terminal; no PCB trace or solder connection required |
| 3 | Cathode (K) | Connected to higher-potential node; carries full regulation current; primary thermal path to PCB |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current specification | Rated at 50 µA - enables stable regulation in µA-level bias networks for ultra-low-power IoT sensors |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching transients and EMI in fast-turning reference circuits |
| High-voltage Zener range | Up to 51 V (C-series) - supports industrial 24 V/48 V rail monitoring without cascading diodes |
| Small-footprint SMT packaging | SOT23 outline with 1.9 mm pitch - compatible with high-density PCB layouts and automated assembly |
| Stable temperature coefficient | +0.05 mV/K - minimizes drift over −55 °C to +150 °C ambient, suitable for extended-temperature deployments |
Applications
| Voltage Reference for ADC Biasing | Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Providing stable 43 V reference to a high-resolution SAR ADC's internal voltage divider network in a battery-operated environmental monitor. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to generate fixed reference potential independent of supply variation. Use Value: Enables <1 LSB gain error over 0–100 % battery discharge due to 0.05 µA leakage and 375 Ω rdiff limiting current-source loading effects. |
Use Scenario: Generating a clean 43 V threshold signal to trigger an external supervisor IC when main 48 V rail exceeds safe operating limits. IC Role / Device Role / Timing Role: Precision overvoltage detection element with defined hysteresis via resistor divider feedback. Use Value: Delivers ±2.15 V trip accuracy (±5 %) and sub-µA quiescent draw, extending system uptime between battery charges by >12 % versus standard 1N47xx alternatives. |
| Low-Power Sensor Excitation | ESD-Clamp Protection Node |
|
Use Scenario: Supplying regulated excitation voltage to a 43 V-rated piezoresistive pressure sensor in a handheld diagnostic tool. IC Role / Device Role / Timing Role: Constant-voltage source maintaining sensor bridge bias under varying battery voltage (30–46 V). Use Value: Maintains sensor linearity within ±0.15 % FS across temperature thanks to +0.05 mV/K TC and 40 pF capacitance filtering RF coupling. |
Use Scenario: Placed across a 43 V analog input line to clamp ESD transients before they reach sensitive op-amp inputs. IC Role / Device Role / Timing Role: Fast-response shunt protector absorbing IEC 61000-4-2 Level 4 (15 kV air) surges. Use Value: Limits clamping voltage to ≤45.15 V with 40 W peak surge capability (100 µs), preventing op-amp saturation and latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C43 | Same 43 V nominal, ±5 %, but rated at 1 mA test current; higher rdiff (400 Ω); no intentional leakage optimization | Limited to static reference use; unsuitable for fast-switching or noise-sensitive analog circuits | Select when lowest-cost drop-in replacement is needed and transient performance is not critical |
| MMSZ43ET1G | 43 V, ±5 %, 300 mW Ptot, 500 Ω rdiff at 1 mA; SOD-123 package; no documented leakage tuning | Higher power rating but larger footprint; less precise low-current regulation due to higher test current | Choose for higher continuous power handling where board space permits SOD-123 layout |
Compared with BZX8450-C43VL, BZX84-C43 offers simpler qualification but lacks low-current stability and noise reduction features, while MMSZ43ET1G trades SOT23 compactness for marginally higher power - making the BZX8450-C43VL optimal for space-constrained, ultra-low-power, and EMI-sensitive designs.
Availability
BZX8450-C43VL is available at Aetrix Electronics and suitable for voltage reference generation, microcontroller reset supervision, low-power sensor excitation, and ESD-clamp protection requiring stable component supply across industrial, medical, and portable electronics programs.
Supply support for BZX8450-C43VL 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 automotive-qualified and energy-efficient components.
The BZX8450 series belongs to Nexperia's low-current Zener regulator product line, engineered specifically for precision biasing and reference functions in battery-powered and thermally constrained applications.
FAQ
What is the maximum continuous reverse current the BZX8450-C43VL can sustain without exceeding its 250 mW power limit?
At 43 V nominal regulation voltage, the absolute maximum continuous reverse current is approximately 5.8 mA (250 mW ÷ 43 V), assuming ambient temperature ≤25 °C on standard FR4 PCB. Derating is required above 25 °C per the 500 K/W junction-to-ambient thermal resistance.
How does the "intentional minor rise of leakage current" benefit circuit performance?
Per Application Note AN90031, this controlled leakage improves transient response and reduces switching noise by minimizing minority-carrier storage delay during turn-off - particularly valuable in fast-ramping reference circuits and low-duty-cycle monitoring systems.
Can the n.c. pin (Pin 2) be left floating or must it be grounded?
Pin 2 is internally unconnected and electrically isolated; it must remain unconnected on the PCB - neither grounded nor tied to any net. Soldering or routing to this pad may cause mechanical stress or unintended parasitic coupling, violating the qualified SOT23 footprint.
Is the BZX8450-C43VL suitable for use in automotive applications?
No - this device is not AEC-Q200 qualified, lacks automotive-grade screening, and is explicitly designated for industrial and consumer applications. Nexperia's datasheet states non-automotive qualification applies unless otherwise specified, and no automotive test data is published for this part number.
BZX8450-C43VL 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:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.6 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-C43VL FAQ
1.How can I place an order for BZX8450-C43VL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C43VL 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-C43VL reliable?
The price and inventory of BZX8450-C43VL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C43VL is usually 5 days.
3.What payment methods are accepted for BZX8450-C43VL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C43VL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C43VL?
BZX8450-C43VL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C43VL 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-C43VL?
For technical support, including BZX8450-C43VL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C43VL requirements.
6.How does Aetrix verify that BZX8450-C43VL is sourced from the original manufacturer or authorized distributors?
All BZX8450-C43VL 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-C43VL meets industry standards.
7.What is the process for return or replacement of BZX8450-C43VL?
All BZX8450-C43VL units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C43VL, 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-C43VL part is unused and in its original packaging.
Return procedure for BZX8450-C43VL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C43VL Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
-
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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