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Nexperia USA Inc. BZX84W-C43-QX
- Part No.:
- BZX84W-C43-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C43-QX.pdf
- Description:
- DIODE ZENER 43V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,788
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Product details
Overview
BZX84W-C43-QX from Nexperia is a ±5% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 43 V nominal Zener voltage at 2 mA, 275 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It provides stable voltage reference in low-power regulation circuits, ESD protection clamping networks, and precision biasing in sensor signal conditioning modules.
For engineers reviewing the BZX84W-C43-QX datasheet, BZX84W-C43-QX pinout, BZX84W-C43-QX application, or BZX84W-C43-QX equivalent, key selection criteria include Zener voltage tolerance (±5%), differential resistance (375 Ω at 2 mA), temperature coefficient (+41.2 mV/K), junction-to-ambient thermal resistance (455 K/W), and automotive qualification status.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified Zener voltage of 40.0–46.0 V at IZ = 2 mA, exhibiting a positive temperature coefficient of +41.2 mV/K - indicating voltage increases with temperature, suitable for temperature-compensated reference designs. Its differential resistance of 375 Ω at 2 mA defines regulation stiffness under varying load current.
The device features a non-connected (n.c.) terminal (Pin 2), enabling layout flexibility in high-density PCBs while maintaining anode (Pin 1) and cathode (Pin 3) functionality. Thermal performance is defined for mounting on FR4 PCB with single-sided copper, tin-plated, standard footprint - limiting maximum ambient operation to +150 °C and junction temperature to 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40.0 V to 46.0 V at IZ = 2 mA - defines stable regulation range for mid-range voltage references |
| Tolerance | ±5% - specifies worst-case deviation from nominal 43 V, critical for accuracy-critical biasing |
| Differential Resistance (rdif) | 375 Ω at IZ = 2 mA - determines output impedance and load regulation error sensitivity |
| Temperature Coefficient (SZ) | +41.2 mV/K - enables predictable drift compensation in thermally varying environments |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 - sets maximum continuous DC power handling under standard PCB conditions |
| Reverse Current (IR) | 50 nA at VR = 0.7 × VZnom - ensures minimal leakage in high-impedance reference nodes |
| Junction-to-Ambient Rth(j-a) | 455 K/W - quantifies thermal bottleneck for derating above 25 °C ambient |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package: 1.3 mm × 1.75 mm × 0.95 mm body, 0.65 mm pitch, 3-terminal configuration with exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internally unconnected; must be left floating or tied to ground per layout rules - no electrical function |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node and carries Zener current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Wide Zener voltage range | 43 V nominal supports mid-voltage rail monitoring and clamp applications in 36 V/48 V systems |
| Low capacitance | 0.6 pF at f = 1 MHz, VR = 0 V - minimizes signal distortion in high-frequency snubbing and RF bias networks |
| High surge capability | 40 W non-repetitive peak reverse power (tp = 100 µs) - withstands transient overvoltage events |
| Stable temperature behavior | +41.2 mV/K coefficient enables predictable drift modeling in thermal-aware reference design |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for analog front-end comparators monitoring 12 V battery health and load-dump transients. IC Role / Device Role / Timing Role: Zener clamp and reference generator stabilizing comparator threshold against supply variation. Use Value: ±5% tolerance and AEC-Q101 qualification ensure consistent trip-point accuracy across −40 °C to +125 °C operating range. |
Use Scenario: Precision biasing of bridge-based pressure sensors in factory automation transmitters. IC Role / Device Role / Timing Role: Low-drift voltage reference establishing excitation voltage for Wheatstone bridge. Use Value: +41.2 mV/K temperature coefficient allows complementary drift cancellation when paired with NTC elements. |
| Telecom Line Interface Unit (LIU) | Medical Patient Monitor Power Sequencing |
Use Scenario: Overvoltage protection clamping on RS-485 bus lines exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response shunt protector absorbing transient energy before downstream PHY ICs. Use Value: 40 W non-repetitive surge rating and 0.6 pF capacitance preserve signal integrity up to 10 Mbps. |
Use Scenario: Power-rail sequencing supervisor using discrete Zener reference to trigger reset logic at 43 V threshold. IC Role / Device Role / Timing Role: Passive voltage threshold detector enabling safe startup sequence in multi-rail medical supplies. Use Value: 275 mW power rating and 375 Ω rdif support stable hysteresis design without active components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-B43-Q | ±2% tolerance (vs. ±5%), identical VZ range and package | Higher accuracy required in metrology-grade references or calibration circuits | Select when tighter regulation tolerance outweighs cost premium and availability constraints |
| MMSZ5255B-TP | ±5% tolerance, 43 V nominal, SOD-123 package, 500 mW Ptot, higher rdif (600 Ω) | Higher power handling needed but larger footprint acceptable; less stringent thermal limits | Choose for non-automotive industrial use where board space permits larger package and higher dissipation |
Compared with BZX84W-C43-QX, BZX84W-B43-Q offers tighter tolerance for precision references but lacks automotive qualification documentation, while MMSZ5255B-TP trades AEC-Q101 compliance and compact SOT323 size for higher power and relaxed regulation stiffness.
Availability
BZX84W-C43-QX is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom line protection, and medical power sequencing requiring stable component supply with traceable automotive-grade sourcing.
Supply support for BZX84W-C43-QX 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 components and advanced packaging.
The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for robust voltage regulation and clamping in harsh automotive and industrial environments.
FAQ
What is the maximum continuous reverse current this diode can handle at 43 V?
The BZX84W-C43-QX is rated for 275 mW total power dissipation at 25 °C ambient on FR4 PCB. At 43 V Zener voltage, this corresponds to a maximum continuous reverse current of approximately 6.4 mA (275 mW ÷ 43 V). Derating applies above 25 °C per the 455 K/W thermal resistance.
Is Pin 2 electrically functional or should it be left unconnected?
Pin 2 is explicitly designated "n.c." (not connected) in the official Nexperia datasheet and simplified outline. It has no internal bond wire or die connection and must remain electrically floating - neither grounded nor tied to any net - to avoid unintended parasitic coupling or solder bridging risks.
How does the +41.2 mV/K temperature coefficient affect circuit stability?
The positive temperature coefficient means the Zener voltage increases by 41.2 mV per Kelvin rise in junction temperature. In circuits where thermal drift must be minimized, this characteristic can be leveraged in combination with negative-TC components (e.g., forward-biased diodes) to achieve near-zero net drift across operating temperature ranges.
Can this part replace older BZX84-C43 variants in existing designs?
Yes - BZX84W-C43-QX maintains identical electrical specifications, SOT323 footprint, and pinout as legacy BZX84-C43 parts, but adds AEC-Q101 qualification, tighter process control, and updated marking (U3%). No layout or schematic changes are required for drop-in replacement in automotive or industrial upgrades.
BZX84W-C43-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W-Q
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±6.98%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-C43-QX FAQ
1.How can I place an order for BZX84W-C43-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C43-QX 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 BZX84W-C43-QX reliable?
The price and inventory of BZX84W-C43-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C43-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-C43-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C43-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C43-QX?
BZX84W-C43-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C43-QX 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 BZX84W-C43-QX?
For technical support, including BZX84W-C43-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C43-QX requirements.
6.How does Aetrix verify that BZX84W-C43-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-C43-QX 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 BZX84W-C43-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-C43-QX?
All BZX84W-C43-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C43-QX, 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 BZX84W-C43-QX part is unused and in its original packaging.
Return procedure for BZX84W-C43-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C43-QX Tags
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Diodes Incorporated
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