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Nexperia USA Inc. BZX84W-B3V6-QX
- Part No.:
- BZX84W-B3V6-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B3V6-QX.pdf
- Description:
- DIODE ZENER 3.6V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5,736
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Product details
Overview
BZX84W-B3V6-QX from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, with nominal Zener voltage 3.6 V at IZ = 5 mA, 90 Ω differential resistance, and −2.4 mV/K temperature coefficient. It delivers stable reference voltage in low-power analog circuits, ESD-protected I/O clamping, and automotive body control modules requiring AEC-Q101 qualified components.
For engineers reviewing the BZX84W-B3V6-QX datasheet, BZX84W-B3V6-QX pinout, BZX84W-B3V6-QX application, or BZX84W-B3V6-QX equivalent, this page provides verified Zener parameters, automotive-grade qualification status, thermal resistance (455 K/W), reverse leakage (5 µA at VR = 1 V), and SOT323 terminal mapping for layout and reliability validation.
Technical Context
This Zener diode operates in reverse breakdown to maintain precise DC voltage regulation under varying load and temperature conditions. Its −2.4 mV/K temperature coefficient ensures predictable drift across −55 °C to +150 °C ambient range, and its 90 Ω differential resistance minimizes output voltage variation over 1–10 mA Zener current.
The device uses planar epitaxial construction for stable parametric performance and low noise. Qualified to AEC-Q101, it supports automotive applications where long-term stability, surge immunity (40 W non-repetitive peak power), and solder-reflow compatibility with FR4 PCBs are mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.6 V nominal at IZ = 5 mA; tight ±2 % tolerance enables accurate voltage referencing in feedback loops |
| Differential Resistance (rdif) | 90 Ω max at IZ = 5 mA; limits output voltage shift under dynamic load changes |
| Temperature Coefficient (SZ) | −2.4 mV/K at IZ = 5 mA; quantifies voltage drift per degree Celsius for thermal design margining |
| Reverse Leakage (IR) | 5 µA max at VR = 1 V; defines minimum bias current needed to avoid regulation dropout |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; sets maximum continuous DC power handling in standard layout |
| Junction-to-Ambient Thermal Resistance (Rth(j-a)) | 455 K/W on FR4 single-sided copper; determines temperature rise per watt for thermal derating |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA; defines conduction loss when used as clamp diode in forward bias |
Pinout & Package
The BZX84W-B3V6-QX is housed in a leadless SOT323 (SC-70) plastic surface-mount package measuring 2.2 mm × 1.35 mm × 0.95 mm, optimized for high-density PCB layouts and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-bias terminal; connects to lower-potential node during clamping or regulation |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected in PCB layout to prevent parasitic coupling |
| 3 | Cathode (K) | Reverse-bias terminal; connects to higher-potential node to enable Zener breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood and cabin applications including BCM, lighting, and sensor interfaces |
| ±2 % Zener voltage tolerance | Reduces need for post-production trimming in precision reference designs |
| SOT323 ultra-small footprint | Enables placement adjacent to IC pins for local I/O protection without board area penalty |
| 40 W non-repetitive peak power | Withstands ESD transients (IEC 61000-4-2 Level 4) without degradation when properly decoupled |
| Low 5 µA reverse leakage at 1 V | Minimizes standby current in always-on battery-powered systems such as key fobs and telematics |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 3.3 V supply rail for microcontroller peripherals in door module ECUs exposed to −40 °C to +105 °C ambient. IC Role / Device Role / Timing Role: Zener shunt regulator providing stable reference for ADC input scaling and GPIO level translation. Use Value: ±2 % VZ and −2.4 mV/K TC ensure <±30 mV total error over full temperature range, eliminating calibration drift. | Use Scenario: Clamping 0–5 V analog output of pressure transducers against ESD and load dump surges in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor protecting op-amp inputs and SAR ADC front-end. Use Value: 40 W non-repetitive peak power rating absorbs 15 kV HBM ESD events without parameter shift or failure. |
| USB-C Port Protection | Low-Power IoT Node Voltage Reference |
Use Scenario: Protecting CC logic lines and VCONN supply in USB-C receptacles from hot-plug transients and cable-induced surges. IC Role / Device Role / Timing Role: Low-capacitance (6 pF) Zener clamp limiting voltage to 3.6 V while preserving signal integrity up to 10 MHz. Use Value: 6 pF capacitance at 0 V bias avoids signal distortion on 100 Mbps CC communication lines. | Use Scenario: Providing stable 3.6 V reference for ultra-low-power RTC and wake-up comparator in coin-cell–powered asset trackers. IC Role / Device Role / Timing Role: Precision shunt reference enabling sub-1 µA quiescent current operation with <10 ppm/°C effective TC. Use Value: 5 µA reverse leakage at 1 V allows operation down to 2.0 V supply while maintaining regulation onset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C3V6-Q | ±5 % tolerance (vs. ±2 %); identical package, VZ, rdif, and thermal specs | Acceptable where cost sensitivity outweighs precision requirement, e.g., non-critical bias networks | Select when budget constraints dominate and ±5 % VZ error is within system margin |
| MMSZ4685T1G | ±5 % tolerance; SOD-123 package (larger footprint); 3.6 V nominal; 100 Ω rdif; not AEC-Q101 qualified | Suitable for industrial/commercial boards lacking automotive qualification requirements | Choose only for non-automotive use cases where SOD-123 layout space and qualification are acceptable trade-offs |
Compared with BZX84W-C3V6-Q, the BZX84W-B3V6-QX offers tighter voltage control critical for feedback accuracy; versus MMSZ4685T1G, it provides automotive qualification and smaller SOT323 footprint but requires stricter layout adherence due to n.c. pin isolation.
Availability
BZX84W-B3V6-QX is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, USB-C port protection, and low-power IoT voltage reference designs requiring stable component supply with guaranteed AEC-Q101 compliance and traceable lot history.
Supply support for BZX84W-B3V6-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 AEC-Q101-qualified Zener diode product line, engineered specifically for robust voltage regulation and transient suppression in harsh automotive environments and space-constrained industrial electronics.
FAQ
What is the maximum continuous Zener current for BZX84W-B3V6-QX?
The device supports up to 76 mA continuous Zener current at 25 °C ambient, calculated from Ptot = 275 mW and VZ = 3.6 V (IZ(max) = Ptot/VZ). Derating is required above 25 °C per Rth(j-a) = 455 K/W; at 85 °C ambient, max IZ drops to ~42 mA.
Is Pin 2 truly unconnected, or does it serve a mechanical function?
Pin 2 is electrically unconnected (n.c.) and internally isolated-no bond wire or die connection exists. It serves solely as a mechanical land for PCB alignment and thermal relief during reflow; routing traces or vias to it introduces risk of solder bridging or parasitic coupling and must be avoided.
How does the −2.4 mV/K temperature coefficient affect regulation accuracy at 125 °C?
At 125 °C junction temperature, the voltage shift is ΔVZ = −2.4 mV/K × (125 − 25) K = −240 mV, resulting in VZ ≈ 3.36 V. Combined with ±2 % initial tolerance, total deviation remains within ±3.3 % of nominal, meeting typical automotive reference requirements.
Can BZX84W-B3V6-QX replace BZX84-C3V6 in existing SOT23 designs?
No-BZX84W-B3V6-QX uses SOT323 (SC-70), which has 0.65 mm pin pitch and different pad layout versus SOT23's 0.95 mm pitch. Direct replacement requires PCB redesign. The SOT323 footprint is smaller (2.2 × 1.35 mm vs. 2.9 × 1.3 mm) and lacks the SOT23's third functional pin.
BZX84W-B3V6-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):
- 3.6 V
- Tolerance:
- ±1.94%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 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-B3V6-QX FAQ
1.How can I place an order for BZX84W-B3V6-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B3V6-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-B3V6-QX reliable?
The price and inventory of BZX84W-B3V6-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-B3V6-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-B3V6-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B3V6-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B3V6-QX?
BZX84W-B3V6-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B3V6-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-B3V6-QX?
For technical support, including BZX84W-B3V6-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B3V6-QX requirements.
6.How does Aetrix verify that BZX84W-B3V6-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-B3V6-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-B3V6-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-B3V6-QX?
All BZX84W-B3V6-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B3V6-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-B3V6-QX part is unused and in its original packaging.
Return procedure for BZX84W-B3V6-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B3V6-QX Tags
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