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Nexperia USA Inc. BZX84W-B11-QX
- Part No.:
- BZX84W-B11-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B11-QX.pdf
- Description:
- DIODE ZENER 11V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5,068
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Product details
Overview
BZX84W-B11-QX 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, 150 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 biasing stages of sensor signal conditioning modules.
For engineers reviewing the BZX84W-B11-QX datasheet, BZX84W-B11-QX pinout, BZX84W-B11-QX application, or BZX84W-B11-QX equivalent, key selection factors include its 11.0–11.2 V Zener voltage range at 5 mA, 150 Ω typical differential resistance, −100 nA reverse leakage at 8 V, 85 °C/W thermal resistance on FR4 PCB, and automotive-grade reliability under −55 °C to +150 °C ambient conditions.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable reference voltage across its cathode-anode terminals. Its ±2% tolerance (B-series), low 150 Ω dynamic impedance at 5 mA, and negative temperature coefficient of +7.4 mV/K enable precise, repeatable regulation in temperature-sensitive analog front-ends.
The device features a not-connected (n.c.) terminal (Pin 2), simplifying layout while maintaining mechanical symmetry in the SOT323 package. Its 275 mW power rating applies only under defined PCB mounting conditions-single-sided copper, tin-plated, standard footprint-making thermal design context-critical for sustained operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10.8–11.2 V at IZ = 5 mA; ensures tight regulation window for 11 V rail supervision |
| Tolerance | ±2 % (B-series); reduces calibration overhead in precision reference designs |
| Differential Resistance (rdiff) | 150 Ω max at IZ = 5 mA; limits output voltage shift under load current variation |
| Reverse Leakage (IR) | 100 nA max at VR = 8 V; minimizes quiescent current in battery-powered standby circuits |
| Total Power Dissipation (Ptot) | 275 mW on FR4 PCB (single-sided, tin-plated); defines maximum continuous DC power under specified board layout |
| Junction Temperature (Tj) | −55 °C to +150 °C; supports operation in under-hood automotive environments |
| AEC-Q101 Qualified | Yes; validated for automotive discrete semiconductor stress testing per AEC standard |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; compact 2.2 mm × 1.35 mm footprint and 0.65 mm pitch; optimized for high-density PCB layouts and reflow soldering.
| 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.) | Electrically isolated; no internal bond wire; used for mechanical symmetry and thermal balance |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node; carries regulated Zener current |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 compliant; suitable for engine control units, body electronics, and ADAS sensor modules |
| Low-leakage Zener operation | 100 nA max reverse current at 8 V enables microamp-level standby regulation |
| Stable temperature coefficient | +7.4 mV/K at 5 mA allows predictable drift compensation in wide-temperature-range designs |
| High-frequency capability | 2.5 pF junction capacitance at 0 V enables use in RF decoupling and fast transient suppression |
| Standardized marking | Mark code J2% indicates B-series (±2%), 11 V nominal, and manufacturing site code |
Applications
| Automotive Sensor Biasing | USB Port Overvoltage Clamp |
|---|---|
|
Use Scenario: Providing stable 11 V reference for analog output sensors (e.g., pressure, temperature) in engine control modules. IC Role / Device Role / Timing Role: Zener voltage reference diode operating in reverse breakdown to fix bias point of op-amp input stage. Use Value: ±2% tolerance and +7.4 mV/K TC ensure <±30 mV total drift over −40 °C to +125 °C, meeting ASIL-B sensor accuracy requirements. |
Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events or ESD strikes. IC Role / Device Role / Timing Role: Low-capacitance (2.5 pF) Zener clamp placed between VBUS and GND to limit voltage to 11.2 V peak. Use Value: 100 nA leakage at 8 V prevents false triggering of USB enumeration; 40 W non-repetitive surge rating absorbs IEC 61000-4-2 Level 4 ESD pulses. |
| Industrial PLC Input Protection | Low-Power MCU Reset Circuit |
|
Use Scenario: Protecting 24 V digital input channels of programmable logic controllers against overvoltage faults. IC Role / Device Role / Timing Role: Zener shunt element in series with current-limiting resistor to clamp input voltage to safe levels. Use Value: 275 mW power rating sustains 24 V transients up to 110 ms duration on standard FR4 PCB; AEC-Q101 qualification confirms long-term reliability in harsh industrial environments. |
Use Scenario: Generating a clean reset threshold for 3.3 V microcontrollers using a resistor-divider and Zener reference. IC Role / Device Role / Timing Role: Precision 11 V Zener feeding a voltage divider to produce ~1.2 V reset threshold at MCU's reset pin. Use Value: 150 Ω dynamic impedance ensures <10 mV error in divided voltage under 10 µA load; J2% marking enables traceable lot-level calibration in production test. |
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-Q | ±5 % tolerance (C-series); wider 10.4–11.6 V Zener range; identical package and thermal specs | Acceptable where system-level calibration compensates for voltage spread; lower cost | Select when absolute voltage accuracy is secondary to cost and availability |
| MMSZ5240B-TP | 10 V nominal, ±5 %; SOD-123 package; 500 mW Ptot; 170 Ω rdiff; not AEC-Q101 qualified | Higher power handling but larger footprint; unsuitable for automotive without additional qualification | Choose only for non-automotive, higher-power applications where SOD-123 layout is acceptable |
Compared with BZX84W-C11-Q, the BZX84W-B11-QX delivers tighter voltage control critical for uncalibrated analog circuits; versus MMSZ5240B-TP, it trades power headroom for AEC-Q101 compliance and smaller SOT323 footprint-essential for space-constrained automotive ECUs.
Availability
BZX84W-B11-QX is available at Aetrix Electronics and suitable for automotive sensor biasing, USB port protection, and industrial PLC input protection requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BZX84W-B11-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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
The BZX84W-Q series belongs to Nexperia's automotive-qualified Zener diode portfolio, engineered specifically for stable voltage reference and overvoltage protection in safety-critical and thermally demanding electronic control units.
FAQ
What is the maximum continuous reverse current the BZX84W-B11-QX can sustain at 11 V?
The device does not specify a maximum continuous reverse current at 11 V; instead, its safe operating area is governed by total power dissipation. At 11 V, the maximum DC current is limited to 25 mA (275 mW ÷ 11 V) on a standard FR4 PCB. Exceeding this risks thermal runaway due to the positive temperature coefficient above ~5 V.
Can BZX84W-B11-QX be used in parallel for higher power dissipation?
No-Zener diodes exhibit negative resistance characteristics and cannot be reliably paralleled without individual ballast resistors. Even with matching units, slight VZ variations cause current hogging; the datasheet explicitly prohibits parallel operation without external current-sharing components.
Is the n.c. pin (Pin 2) required to be left floating or grounded on PCB?
Pin 2 is internally unconnected and must remain electrically floating-no trace, pad, or via should tie it to any net. Grounding or routing to a signal violates the SOT323 mechanical design and may induce parasitic coupling or thermal imbalance affecting Zener stability.
How does the +7.4 mV/K temperature coefficient impact circuit performance at 125 °C ambient?
From 25 °C to 125 °C, the Zener voltage increases by approximately 740 mV (100 K × 7.4 mV/K), shifting the nominal 11.0 V rating to ~11.74 V. This drift must be accommodated in reference-dependent circuits-e.g., comparator thresholds or ADC reference buffers-via design margin or active compensation.
BZX84W-B11-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):
- 11 V
- Tolerance:
- ±1.82%
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B11-QX FAQ
1.How can I place an order for BZX84W-B11-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B11-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-B11-QX reliable?
The price and inventory of BZX84W-B11-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-B11-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-B11-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B11-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B11-QX?
BZX84W-B11-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B11-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-B11-QX?
For technical support, including BZX84W-B11-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B11-QX requirements.
6.How does Aetrix verify that BZX84W-B11-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-B11-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-B11-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-B11-QX?
All BZX84W-B11-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B11-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-B11-QX part is unused and in its original packaging.
Return procedure for BZX84W-B11-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B11-QX 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
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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