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Nexperia USA Inc. BZX84W-B3V0-QX
- Part No.:
- BZX84W-B3V0-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B3V0-QX.pdf
- Description:
- DIODE ZENER 3V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,407
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Product details
Overview
BZX84W-B3V0-QX from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 3.0 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It provides stable voltage reference in low-power biasing, overvoltage clamping, and signal-level regulation circuits.
For engineers reviewing the BZX84W-B3V0-QX datasheet, BZX84W-B3V0-QX pinout, BZX84W-B3V0-QX application, or BZX84W-B3V0-QX equivalent, key selection criteria include Zener voltage tolerance (±2 %), low differential resistance (95 Ω at 5 mA), reverse leakage current (10 µA at 1 V), thermal resistance (455 K/W), and AEC-Q101 qualification status.
Technical Context
This Zener diode operates in reverse breakdown with a specified nominal Zener voltage of 3.0 V at IZ = 5 mA and exhibits a negative temperature coefficient of −2.1 mV/K. Its differential resistance is 95 Ω at 5 mA, enabling stable regulation under moderate load variation.
The device features a non-connected (n.c.) terminal (Pin 2), anode (Pin 1), and cathode (Pin 3), and is mounted on FR4 PCB with single-sided copper. It supports pulse surge handling up to 40 W (100 µs, 25 °C ambient) and operates across −55 °C to +150 °C ambient temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.0 V nominal at IZ = 5 mA; tight ±2 % tolerance ensures precise voltage reference in feedback and bias networks. |
| Differential Resistance (rdif) | 95 Ω at IZ = 5 mA; low impedance maintains regulation stability against small current fluctuations. |
| Reverse Leakage (IR) | 10 µA max at VR = 1 V; minimal off-state current avoids parasitic loading in high-impedance nodes. |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; defines maximum continuous DC power handling in standard layout. |
| Thermal Resistance (Rth(j-a)) | 455 K/W; determines junction-to-ambient temperature rise per watt-critical for thermal margin in compact designs. |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA; enables predictable forward conduction in dual-direction clamp or protection configurations. |
| Temperature Coefficient (SZ) | −2.1 mV/K at IZ = 5 mA; quantifies voltage drift with temperature-essential for precision analog references. |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; dimensions per JEDEC outline: 2.2 mm × 1.35 mm × 0.95 mm height; 0.65 mm pitch; tin-plated terminations compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node during regulation or clamping operation. |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating-no PCB trace or solder mask relief required beyond standard keep-out. |
| 3 | Cathode (K) | Reverse-biased terminal; ties to regulated output or clamped rail; carries Zener current during breakdown. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTGB, HTRB, and temperature cycling-enables use in engine control, body electronics, and ADAS modules. |
| ±2 % Zener voltage tolerance | Reduces binning requirements and simplifies design margining for 3.0 V reference applications such as MCU reset circuits and ADC reference buffers. |
| Low 95 Ω differential resistance | Minimizes output voltage shift under ±1 mA load variation-critical for stable biasing of op-amp input stages or transistor bases. |
| 10 µA max reverse leakage at 1 V | Prevents unintended current paths in high-impedance sensor interfaces or battery-powered standby circuits where quiescent current matters. |
| SOT323 footprint compatibility | Matches industry-standard SC-70 land pattern (2.65 mm × 2.35 mm solder pads); supports automated placement and reflow without custom stencil adjustments. |
Applications
| Automotive Sensor Biasing | Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Providing stable 3.0 V bias to analog front-end circuitry in vehicle cabin temperature or pressure sensors. IC Role / Device Role / Timing Role: Zener diode acts as shunt voltage reference, setting operating point for signal conditioning amplifiers and ADC inputs. Use Value: ±2 % tolerance and −2.1 mV/K tempco ensure <±15 mV drift over −40 °C to +125 °C, meeting ASIL-A sensor accuracy requirements. |
Use Scenario: Generating clean, noise-immune reset threshold for 3.3 V microcontrollers in infotainment head units. IC Role / Device Role / Timing Role: Functions as precision clamp in RC-based reset generator, defining exact voltage trip point for POR and brown-out detection. Use Value: 95 Ω rdif and 10 µA IR prevent timing jitter and false resets caused by supply ripple or leakage-induced voltage droop. |
| USB Port Overvoltage Protection | Industrial Signal Level Shifting |
|
Use Scenario: Clamping transient surges on USB D+/D− lines in automotive telematics gateways exposed to load dump events. IC Role / Device Role / Timing Role: Fast-acting shunt protector limiting line voltage to 3.0 V during ESD or ISO 7637-2 pulse 5a transients. Use Value: 40 W non-repetitive peak power rating (100 µs) absorbs surge energy without failure, while low capacitance (<6 pF) preserves USB 2.0 signal integrity. |
Use Scenario: Translating 5 V logic signals to 3.3 V or 3.0 V domains in PLC I/O modules interfacing legacy field devices. IC Role / Device Role / Timing Role: Zener-based level translator providing bidirectional voltage limiting between mixed-supply subsystems. Use Value: 0.9 V forward voltage enables reliable low-side clamping; SOT323 size allows dense placement near connectors and isolation barriers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C3V0-Q | Same 3.0 V nominal voltage but ±5 % tolerance (vs. ±2 %); higher max reverse leakage (10 µA vs. same spec, but typical C-series values show wider spread). | Acceptable in cost-sensitive consumer or industrial applications where tighter regulation isn't required. | Select when AEC-Q101 is not mandatory and ±5 % voltage margin suffices for system-level tolerance stack-up. |
| MMSZ4684T1G | 3.0 V Zener, ±5 %, SOD-123 package (larger than SOT323); 500 mW Ptot; no AEC-Q101 qualification stated in ON Semi datasheet. | Used in non-automotive power supplies and general-purpose regulation where board space is less constrained. | Choose only for non-automotive designs needing higher power derating margin; avoid where AEC-Q101 compliance or SOT323 footprint is required. |
Compared with BZX84W-C3V0-Q, the BZX84W-B3V0-QX offers tighter voltage control and guaranteed automotive qualification; versus MMSZ4684T1G, it delivers smaller footprint, lower thermal resistance, and certified reliability-but at lower absolute power rating.
Availability
BZX84W-B3V0-QX is available at Aetrix Electronics and suitable for automotive sensor biasing, microcontroller reset generation, USB port overvoltage protection, and industrial signal level shifting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX84W-B3V0-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 advanced packaging.
The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for robust voltage reference and clamping in automotive ECUs, body control modules, and ADAS subsystems.
FAQ
What is the maximum continuous Zener current for BZX84W-B3V0-QX at 25 °C?
The maximum continuous Zener current is derived from Ptot = 275 mW and VZ = 3.0 V: IZ(max) ≈ 91.7 mA. However, safe operation requires derating above 25 °C using Rth(j-a) = 455 K/W; at 100 °C ambient, usable current drops to ~45 mA to maintain Tj ≤ 150 °C.
Is Pin 2 truly unconnected, or does it serve a mechanical or thermal function?
Pin 2 is electrically and physically unconnected-no internal bond wire or die attachment exists. It serves solely as a mechanical alignment aid during SMT placement and has no thermal or electrical role; PCB layout should leave it un-routed and un-soldered per Nexperia's recommended footprint.
How does the −2.1 mV/K temperature coefficient impact performance in a 3.0 V reference circuit?
Over a −40 °C to +125 °C range (165 K ΔT), the Zener voltage shifts by −2.1 mV/K × 165 K = −346.5 mV-resulting in ~2.65 V at +125 °C. This drift must be accommodated in system-level tolerance budgets; compensation is not built-in.
Can BZX84W-B3V0-QX replace older BZX84-C3V3 in existing designs?
No-BZX84W-B3V0-QX is a 3.0 V ±2 % part; BZX84-C3V3 is a 3.3 V ±5 % part. Voltage mismatch exceeds typical system margin, and SOT323 differs from legacy SOT23 pinout (BZX84-C3V3 uses 3-pin SOT23 with different pin assignment). Direct replacement is not electrically or mechanically viable.
BZX84W-B3V0-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 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 10 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-B3V0-QX FAQ
1.How can I place an order for BZX84W-B3V0-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B3V0-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-B3V0-QX reliable?
The price and inventory of BZX84W-B3V0-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-B3V0-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-B3V0-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B3V0-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B3V0-QX?
BZX84W-B3V0-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B3V0-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-B3V0-QX?
For technical support, including BZX84W-B3V0-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B3V0-QX requirements.
6.How does Aetrix verify that BZX84W-B3V0-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-B3V0-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-B3V0-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-B3V0-QX?
All BZX84W-B3V0-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B3V0-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-B3V0-QX part is unused and in its original packaging.
Return procedure for BZX84W-B3V0-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B3V0-QX Tags
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