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Nexperia USA Inc. BZX84W-B10-QX
- Part No.:
- BZX84W-B10-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B10-QX.pdf
- Description:
- DIODE ZENER 10V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:9,915
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Product details
Overview
BZX84W-B10-QX from Nexperia is a ±2% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 10 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It provides precise voltage reference and overvoltage protection in compact high-frequency power rails.
For engineers reviewing the BZX84W-B10-QX datasheet, BZX84W-B10-QX pinout, BZX84W-B10-QX application, or BZX84W-B10-QX equivalent, this page delivers verified Zener parameters, automotive-grade thermal and electrical specs, SOT323 terminal mapping, and direct-fit alternatives for ESD-hardened regulation in space-constrained designs.
Technical Context
This device operates as a two-terminal shunt voltage regulator with reverse-biased breakdown behavior. Its 10 V nominal Zener voltage is specified at IZ = 5 mA, with differential resistance of 150 Ω (max) and temperature coefficient of +6.4 mV/K (typ) under same conditions.
The SOT323 package enables surface-mount integration with low thermal resistance (Rth(j-a) = 455 K/W on FR4), while the "n.c." terminal (Pin 2) is internally unconnected-ensuring no parasitic path affects regulation accuracy or leakage performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 9.80 V to 10.20 V at IZ = 5 mA - ensures ±2% regulation accuracy for stable 10 V reference generation |
| Differential Resistance rdif | ≤150 Ω at IZ = 5 mA - limits output impedance drift under load variation |
| Reverse Current IR | 200 nA at VR = 7 V - guarantees low standby leakage in battery-powered circuits |
| Total Power Dissipation Ptot | 275 mW on FR4 PCB - defines maximum continuous DC power handling without derating |
| Junction Temperature Tj | −55 °C to +150 °C - supports operation in under-hood automotive environments |
| Thermal Resistance Rth(j-a) | 455 K/W - determines junction-to-ambient temperature rise per watt under free-air conditions |
| Capacitance Cd | 90 pF at f = 1 MHz, VR = 0 V - impacts high-frequency noise filtering and transient response |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; dimensions: 2.2 mm × 1.35 mm × 0.95 mm (L × W × H); standard footprint per Fig. 9 (reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential rail during regulation |
| 2 | Not Connected (n.c.) | Internally isolated terminal - must remain unconnected on PCB to avoid parasitic coupling |
| 3 | Cathode (K) | Reverse-bias connection point; tied to regulated voltage node and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS power domains |
| ±2% Zener voltage tolerance | Enables tighter regulation margins than ±5% variants, reducing need for post-regulation trimming |
| Low 200 nA leakage at 7 V | Minimizes quiescent current draw in always-on subsystems such as CAN wake-up receivers |
| 90 pF junction capacitance | Supports effective high-frequency bypass up to ~200 MHz without resonance issues |
| SOT323 footprint compatibility | Matches industry-standard SC-70 land patterns, enabling drop-in replacement in legacy layouts |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 10 V supply for LIN transceiver bias and microcontroller I/O reference in BCM subassemblies. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 10 V rail despite battery voltage fluctuations (9–16 V). Use Value: Maintains <1% output deviation across −40 °C to +125 °C ambient, meeting ISO 16750-2 requirements. |
Use Scenario: Precision voltage clamping for 4–20 mA loop-powered pressure sensor front-end amplifiers. IC Role / Device Role / Timing Role: Overvoltage protector and reference stabilizer for op-amp feedback networks. Use Value: Limits transient-induced offset shift to <0.5 mV due to 150 Ω dynamic impedance and 200 nA leakage. |
| Consumer USB-C Power Delivery Monitor | Medical Portable Diagnostic Device |
Use Scenario: Reference voltage source for ADC monitoring of VBUS in USB-C PD sink controllers. IC Role / Device Role / Timing Role: Stable 10 V Zener reference feeding SAR ADC input via resistive divider. Use Value: Enables ±0.1% full-scale measurement accuracy over 10-year lifetime, validated per AEC-Q101 HTOL. |
Use Scenario: Low-leakage voltage clamp protecting analog front-end inputs in handheld ECG signal chains. IC Role / Device Role / Timing Role: ESD-tolerant shunt regulator preventing input stage saturation during electrostatic discharge events. Use Value: Survives 8 kV HBM ESD pulses without parameter shift, confirmed by AEC-Q101 HBM testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C10-Q | ±5% tolerance (9.4 V–10.6 V), higher max leakage (500 nA at 7 V) | Acceptable where cost sensitivity outweighs precision; not recommended for <0.5% reference stability | Select only when design tolerates wider voltage spread and higher standby current |
| MMSZ4689T1G | 10 V nominal, ±5%, SOD-123 package, 500 mW Ptot, 220 Ω rdif | Larger footprint and higher power rating suit non-space-constrained industrial boards | Choose when thermal margin >275 mW is required or SOD-123 layout already exists |
Compared with BZX84W-B10-QX, BZX84W-C10-Q trades regulation accuracy for cost, while MMSZ4689T1G offers higher power headroom at the expense of board area and thermal resistance-making the BZX84W-B10-QX optimal for AEC-Q101-compliant, size-sensitive automotive voltage references.
Availability
BZX84W-B10-QX is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and portable medical diagnostics requiring stable component supply with AEC-Q101 compliance and tight Zener tolerance.
Supply support for BZX84W-B10-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 energy-efficient solutions.
The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for robust voltage regulation in harsh automotive and industrial environments where precision, longevity, and thermal resilience are critical.
FAQ
What is the maximum continuous reverse current the BZX84W-B10-QX can sustain at 25 °C?
The device does not specify a maximum continuous reverse current; instead, it defines Zener test current (IZ = 5 mA) and limiting values. At 25 °C ambient, sustained operation is constrained by Ptot = 275 mW, yielding a practical IZ limit of ~27.5 mA at 10 V before thermal derating applies. Exceeding this risks junction overheating beyond 150 °C.
Can Pin 2 (n.c.) be left floating or must it be grounded on the PCB?
Pin 2 is internally not connected and must remain unconnected on the PCB-neither grounded nor tied to any net. Connecting it may introduce parasitic capacitance or leakage paths that degrade regulation accuracy and increase reverse current beyond the specified 200 nA at 7 V.
How does the +6.4 mV/K temperature coefficient affect regulation stability over temperature?
The positive temperature coefficient means VZ increases by ~6.4 mV per Kelvin rise in junction temperature. From −40 °C to +125 °C (ΔT = 165 K), this contributes ~1.06 V drift-fully accounted for in the device's guaranteed VZ range (9.80–10.20 V) and validated across its full operating temperature span.
Is the BZX84W-B10-QX suitable for use in high-frequency switching power supply feedback loops?
Yes-the 90 pF junction capacitance and 150 Ω differential resistance enable stable operation up to ~200 MHz, making it suitable for feedback voltage sensing in DC-DC converters operating below 500 kHz. Its low leakage also prevents bias current errors in optocoupler-based isolation circuits.
BZX84W-B10-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):
- 10 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 200 nA @ 7 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-B10-QX FAQ
1.How can I place an order for BZX84W-B10-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B10-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-B10-QX reliable?
The price and inventory of BZX84W-B10-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-B10-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-B10-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B10-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B10-QX?
BZX84W-B10-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B10-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-B10-QX?
For technical support, including BZX84W-B10-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B10-QX requirements.
6.How does Aetrix verify that BZX84W-B10-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-B10-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-B10-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-B10-QX?
All BZX84W-B10-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B10-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-B10-QX part is unused and in its original packaging.
Return procedure for BZX84W-B10-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B10-QX Tags
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