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Nexperia USA Inc. BZX84W-B11X
- Part No.:
- BZX84W-B11X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B11X.pdf
- Description:
- DIODE ZENER 11V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:1,958
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Product details
Overview
BZX84W-B11X from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 11 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and 150 °C maximum junction temperature. It provides precision voltage reference and regulation in compact high-frequency signal conditioning and power rail stabilization circuits.
For engineers reviewing the BZX84W-B11X datasheet, BZX84W-B11X pinout, BZX84W-B11X application, or BZX84W-B11X equivalent, this page delivers verified Zener parameters, terminal mapping, thermal limits, and real-world use cases for low-power analog reference design and ESD-robust biasing.
Technical Context
This Zener diode operates in reverse breakdown with a specified 11.0 V nominal Zener voltage (VZ) at IZ = 5 mA, differential resistance of 150 Ω max, and temperature coefficient of +7.4 mV/K. Its low 2.5 pF capacitance at 1 MHz enables stable performance in RF coupling and fast-switching feedback paths.
The device features a non-connected (n.c.) center terminal to isolate parasitic coupling in high-density layouts, and its SOT323 footprint supports reflow and wave soldering per IPC-7351B standards. Thermal resistance from junction to ambient is 455 K/W on FR4 PCB with single-sided copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 11.0 V ±2 % at IZ = 5 mA - defines precise DC reference point for analog circuitry |
| Differential Resistance rdif | ≤150 Ω at IZ = 5 mA - ensures minimal output voltage shift under load variation |
| Temperature Coefficient SZ | +7.4 mV/K at IZ = 5 mA - quantifies voltage drift over operating temperature range |
| Total Power Dissipation Ptot | 275 mW at Tamb = 25 °C - sets maximum continuous power handling on standard FR4 PCB |
| Reverse Current IR | 100 nA at VR = 8 V - confirms low leakage for high-impedance bias networks |
| Forward Voltage VF | ≤0.9 V at IF = 10 mA - enables predictable forward conduction in protection clamping |
| Junction Temperature Tj | −55 °C to +150 °C - specifies full operational thermal envelope for industrial environments |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package with 3 leads; lead pitch 0.65 mm, body size 2.2 × 1.35 × 0.95 mm; optimized for automated placement and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connects to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Electrically isolated terminal; eliminates stray capacitance coupling in high-frequency applications |
| 3 | Cathode (K) | Reverse-bias connection point; ties to regulated output node in shunt regulator topology |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tighter regulation accuracy than ±5 % variants, reducing need for post-calibration trimming |
| Low 2.5 pF diode capacitance | Maintains signal integrity in >100 MHz RF detector and oscillator bias networks |
| Non-connected center terminal | Minimizes parasitic coupling in multi-layer PCBs where adjacent traces run beneath the package |
| 455 K/W junction-to-ambient thermal resistance | Supports 275 mW operation without heatsinking on standard FR4 layout with tin-plated copper |
| 150 °C maximum junction temperature | Permits reliable operation in extended-temperature industrial control modules and automotive under-hood auxiliary circuits |
Applications
| Power Supply Reference | RF Signal Detector Bias |
|---|---|
|
Use Scenario: Providing stable 11 V reference for op-amp-based linear regulators in battery-powered IoT sensor nodes. IC Role / Device Role / Timing Role: Shunt voltage reference maintaining constant bias point for error amplifier input. Use Value: ±2 % tolerance ensures <±0.22 V output deviation across production units, eliminating calibration steps. |
Use Scenario: Biasing Schottky diode detectors in 2.4 GHz Wi-Fi front-end monitoring circuits. IC Role / Device Role / Timing Role: Low-capacitance Zener clamp establishing fixed DC offset for RF envelope detection. Use Value: 2.5 pF capacitance prevents detuning of matching networks while delivering stable 11 V bias. |
| ESD-Safe Analog Input Protection | Microcontroller Reset Circuit |
|
Use Scenario: Protecting ADC input pins against transient overvoltage in industrial PLC analog modules. IC Role / Device Role / Timing Role: Bidirectional clamping element limiting input swing to ±11 V relative to ground. Use Value: 40 W non-repetitive peak power rating absorbs IEC 61000-4-2 Level 4 ESD pulses without degradation. |
Use Scenario: Generating clean reset threshold for ARM Cortex-M0+ microcontrollers in smart meter designs. IC Role / Device Role / Timing Role: Precision voltage threshold element triggering POR circuit at exactly 11 V ±2 %. Use Value: +7.4 mV/K temperature coefficient aligns with MCU supply rail drift, minimizing false resets across −40 °C to +85 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C11 | ±5 % tolerance (10.4–11.6 V), identical package and thermal specs | Lower cost for non-critical biasing where ±0.6 V variation is acceptable | Select when absolute voltage accuracy is secondary to BOM cost reduction |
| MMSZ4689-TP | 11 V ±5 %, SOD-123 package, 500 mW Ptot, higher 300 Ω rdif | Higher power handling but larger footprint and poorer regulation stability | Choose only if board space allows larger package and 500 mW dissipation is required |
Compared with BZX84W-C11, the BZX84W-B11X delivers tighter regulation for precision references; versus MMSZ4689-TP, it offers superior voltage stability and smaller footprint at lower power, making it optimal for space-constrained, accuracy-driven designs.
Availability
BZX84W-B11X is available at Aetrix Electronics and suitable for power supply reference, RF detector bias, ESD-safe analog input protection, and microcontroller reset circuit applications requiring stable component supply and consistent parametric performance across production lots.
Supply support for BZX84W-B11X 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, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, high-frequency voltage regulation and reference functions in space-constrained SMT designs.
FAQ
What is the Zener voltage tolerance and test condition for BZX84W-B11X?
The BZX84W-B11X has a ±2 % Zener voltage tolerance, specified at a test current of 5 mA and ambient temperature of 25 °C. The nominal Zener voltage is 11.0 V, resulting in a guaranteed range of 10.8–11.2 V under those conditions. This tolerance is confirmed in Table 8 of the official Nexperia datasheet Rev. 2 (January 2023).
Can BZX84W-B11X be used in high-frequency signal paths?
Yes - BZX84W-B11X exhibits only 2.5 pF junction capacitance at 1 MHz and 0 V reverse bias, enabling stable operation in RF detector biasing, oscillator tuning, and high-speed clamping up to ~500 MHz. Its SOT323 package minimizes parasitic inductance, and the n.c. pin reduces coupling noise in dense layouts.
What is the maximum continuous power dissipation and thermal limit?
BZX84W-B11X is rated for 275 mW total power dissipation at 25 °C ambient on a standard FR4 PCB with single-sided copper. Its absolute maximum junction temperature is 150 °C, and thermal resistance from junction to ambient is 455 K/W under those mounting conditions. Derating is required above 25 °C per the datasheet's thermal curve.
How does the n.c. pin affect PCB layout and functionality?
Pin 2 is electrically unconnected and must remain floating - no trace or pad should tie to it. This isolation eliminates parasitic capacitance between adjacent signal layers, improving high-frequency stability and reducing crosstalk in RF and fast digital interfaces. The pin serves purely mechanical and alignment purposes during placement.
BZX84W-B11X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 11 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B11X FAQ
1.How can I place an order for BZX84W-B11X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B11X 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-B11X reliable?
The price and inventory of BZX84W-B11X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B11X is usually 5 days.
3.What payment methods are accepted for BZX84W-B11X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B11X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B11X?
BZX84W-B11X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B11X 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-B11X?
For technical support, including BZX84W-B11X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B11X requirements.
6.How does Aetrix verify that BZX84W-B11X is sourced from the original manufacturer or authorized distributors?
All BZX84W-B11X 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-B11X meets industry standards.
7.What is the process for return or replacement of BZX84W-B11X?
All BZX84W-B11X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B11X, 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-B11X part is unused and in its original packaging.
Return procedure for BZX84W-B11X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B11X Tags
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MM5Z5V1ST1G
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