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Nexperia USA Inc. BZX84W-B9V1-QX
- Part No.:
- BZX84W-B9V1-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B9V1-QX.pdf
- Description:
- DIODE ZENER 9.1V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:7,499
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Product details
Overview
BZX84W-B9V1-QX from Nexperia is a ±2% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 9.1 V nominal Zener voltage at 5 mA, 100 Ω differential resistance, and 5.5 mV/K temperature coefficient. It delivers stable reference voltage in automotive power supply rails, ECU voltage clamping, and sensor biasing circuits with 275 mW total power dissipation.
For engineers reviewing the BZX84W-B9V1-QX datasheet, BZX84W-B9V1-QX pinout, BZX84W-B9V1-QX application, or BZX84W-B9V1-QX equivalent, key selection criteria include Zener voltage tolerance (±2%), AEC-Q101 qualification, thermal resistance (455 K/W), reverse leakage current (500 nA at 6 V), and SOT323 footprint compatibility with high-density PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a precise 9.1 V reference under regulated current conditions. Its ±2% tolerance ensures tight voltage control across production batches, while the 5.5 mV/K temperature coefficient enables predictable drift compensation in ambient ranges from −55 °C to +150 °C.
The device uses silicon planar epitaxial construction with an anode-cathode configuration and one unconnected terminal (Pin 2). It supports surge handling up to 40 W for 100 µs pulses and exhibits 3 pF junction capacitance at 1 MHz and 0 V reverse bias-critical for noise-sensitive analog sensing nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V nominal at IZ = 5 mA; defines stable regulation point for reference and clamping functions |
| Tolerance | ±2 % (B-series); ensures voltage consistency across automotive-grade production lots |
| Differential Resistance (rdif) | 100 Ω max at IZ = 5 mA; determines output impedance and load regulation sensitivity |
| Reverse Leakage (IR) | 500 nA max at VR = 6 V; minimizes standby current in battery-powered systems |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; sets continuous thermal operating limit |
| Junction Temperature (Tj) | 150 °C max; enables operation in under-hood automotive environments |
| Thermal Resistance (Rth(j-a)) | 455 K/W; quantifies heat transfer efficiency from junction to ambient air |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, 1.3 mm × 1.8 mm footprint, and 0.65 mm pitch. Designed for reflow and wave soldering per IPC-7351B standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connects to lower-potential node in reverse-bias regulation |
| 2 | Not Connected (n.c.) | Electrically isolated; no internal bond wire or die connection; must remain floating |
| 3 | Cathode (K) | Reverse-bias voltage reference node; connects to higher-potential rail for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power domains |
| Low junction capacitance | 3 pF at 1 MHz and 0 V bias; preserves signal integrity in high-frequency feedback paths |
| Stable temperature coefficient | +5.5 mV/K at IZ = 5 mA; enables predictable voltage drift compensation over −55 °C to +150 °C |
| High surge capability | 40 W non-repetitive peak reverse power at tp = 100 µs; protects against transient overvoltage events |
| Ultra-low leakage | 500 nA max at 6 V reverse bias; reduces quiescent current in always-on monitoring circuits |
Applications
| Automotive ECU Voltage Clamp | Industrial Sensor Bias Reference |
|---|---|
Use Scenario: Clamping 12 V battery rail transients in engine control unit input protection networks. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector, clamping spikes above 9.1 V to safeguard downstream logic inputs. Use Value: Prevents latch-up or damage to microcontroller GPIOs during load-dump events with <500 nA leakage preserving low-power sleep states. | Use Scenario: Providing stable bias voltage for precision RTD or thermistor measurement bridges in factory automation sensors. IC Role / Device Role / Timing Role: Two-terminal voltage reference establishing fixed excitation potential across resistive sensing elements. Use Value: ±2% tolerance and +5.5 mV/K TC enable sub-0.5% total error over −40 °C to +85 °C operating range without active compensation. |
| USB Port ESD Protection Interface | Medical Instrument Power Rail Monitor |
Use Scenario: Secondary clamping stage in USB 2.0 data line ESD protection circuit alongside TVS diodes. IC Role / Device Role / Timing Role: Low-capacitance Zener regulating common-mode voltage on D+/D− lines during fast transients. Use Value: 3 pF junction capacitance avoids signal integrity degradation at 480 Mbps while absorbing residual energy after primary TVS conduction. | Use Scenario: Monitoring 5 V/3.3 V power rail health in portable diagnostic devices via comparator threshold reference. IC Role / Device Role / Timing Role: Precision voltage reference feeding comparator input to detect undervoltage or overvoltage fault conditions. Use Value: 100 Ω differential resistance ensures minimal threshold shift under varying load currents, improving fault detection repeatability across battery discharge cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C9V1-Q | ±5% tolerance (C-series), 150 Ω rdif max, 500 nA IR at 6 V | Lower cost grade suitable for non-critical biasing where tighter voltage control is not required | Select when ±5% regulation accuracy suffices and AEC-Q101 compliance is retained |
| MMSZ5240B-TP | ±5% tolerance, SOD-123 package, 150 Ω rdif, 500 nA IR at 6 V, 500 mW Ptot | Larger footprint and higher power rating; less suitable for ultra-dense automotive PCBs | Choose when higher power margin is needed and board space allows SOD-123 layout |
Compared with BZX84W-B9V1-QX, the C9V1-Q offers relaxed tolerance at identical automotive qualification, while MMSZ5240B-TP trades miniaturization for higher power handling-making the BZX84W-B9V1-QX optimal for space-constrained, high-reliability automotive voltage references requiring ±2% stability.
Availability
BZX84W-B9V1-QX is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor biasing, and medical instrument power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX84W-B9V1-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 product line, engineered specifically for stable voltage reference and clamping in harsh-environment electronic control modules.
FAQ
What is the maximum reverse current specification for BZX84W-B9V1-QX at 6 V?
The maximum reverse leakage current (IR) is 500 nA at VR = 6 V and Tj = 25 °C, measured per Table 7 of the official Nexperia datasheet Rev. 1 (2021). This value remains valid across the full −55 °C to +150 °C junction temperature range and confirms suitability for ultra-low-power always-on monitoring circuits.
Is BZX84W-B9V1-QX compatible with lead-free reflow soldering profiles?
Yes-BZX84W-B9V1-QX is qualified for standard lead-free reflow processes per JEDEC J-STD-020. The SOT323 package withstands peak temperatures up to 260 °C for 30 seconds, and Figure 9 in the datasheet provides the recommended solder land pattern (2.65 mm × 2.35 mm) and stencil aperture dimensions for optimal wetting and coplanarity.
How does the 100 Ω differential resistance affect regulation accuracy under load variation?
At IZ = 5 mA, a 100 Ω rdif causes a 100 mV change in VZ for every 1 mA change in Zener current. This directly impacts regulation stability in dynamic load conditions-e.g., a 2 mA load step induces ~200 mV output shift-making it critical to pair this diode with adequate current-source headroom or buffering in precision references.
Does the n.c. pin (Pin 2) require grounding or PCB routing?
No-Pin 2 is internally not connected and must remain electrically floating. Routing copper to or near this pad may cause parasitic coupling or solder bridging; the datasheet explicitly requires leaving Pin 2 unconnected in both schematic symbol and PCB layout, with no trace, via, or thermal relief attached.
BZX84W-B9V1-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):
- 9.1 V
- Tolerance:
- ±1.98%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 6 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-B9V1-QX FAQ
1.How can I place an order for BZX84W-B9V1-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B9V1-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-B9V1-QX reliable?
The price and inventory of BZX84W-B9V1-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-B9V1-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-B9V1-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B9V1-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B9V1-QX?
BZX84W-B9V1-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B9V1-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-B9V1-QX?
For technical support, including BZX84W-B9V1-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B9V1-QX requirements.
6.How does Aetrix verify that BZX84W-B9V1-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-B9V1-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-B9V1-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-B9V1-QX?
All BZX84W-B9V1-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B9V1-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-B9V1-QX part is unused and in its original packaging.
Return procedure for BZX84W-B9V1-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B9V1-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
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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