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Nexperia USA Inc. BZX84W-B3V3-QX
- Part No.:
- BZX84W-B3V3-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B3V3-QX.pdf
- Description:
- DIODE ZENER 3.3V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,315
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Product details
Overview
BZX84W-B3V3-QX from Nexperia is a ±2 % tolerance Zener diode in SOT323 (SC-70) package, rated for 3.3 V nominal regulation voltage at 5 mA, with 275 mW total power dissipation and 5 µA reverse current at VR = 1 V, used for precision voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the BZX84W-B3V3-QX datasheet, BZX84W-B3V3-QX pinout, BZX84W-B3V3-QX application, or BZX84W-B3V3-QX equivalent, this page delivers verified Zener parameters, AEC-Q101 qualification status, thermal resistance (455 K/W), differential resistance (95 Ω), and temperature coefficient (−2.4 mV/K) to support automotive-grade voltage stabilization design.
Technical Context
This Zener diode operates in reverse breakdown mode with a tightly controlled 3.3 V nominal Zener voltage at IZ = 5 mA, exhibiting −2.4 mV/K temperature coefficient and 95 Ω differential resistance-enabling stable low-voltage reference in temperature-sensitive circuits. Its 5 µA leakage at VR = 1 V supports low-power standby regulation.
Qualified per AEC-Q101, it withstands ambient temperatures from −55 °C to +150 °C and junction temperatures up to 150 °C, with non-repetitive peak reverse power dissipation of 40 W for tp = 100 µs pulses-suitable for transient suppression in 12 V automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V nominal at IZ = 5 mA; enables precise 3.3 V rail clamping or reference generation |
| Tolerance | ±2 % (B-series); ensures tight voltage accuracy for automotive sensor biasing and ADC reference |
| Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; defines continuous thermal budget in compact SMT layouts |
| Reverse Current (IR) | 5 µA at VR = 1 V; guarantees low quiescent leakage in battery-backed circuits |
| Differential Resistance (rdiff) | 95 Ω at IZ = 5 mA; determines regulation stiffness under load variation |
| Temperature Coefficient (SZ) | −2.4 mV/K; provides predictable negative drift for compensation in mixed-signal ICs |
| Thermal Resistance (Rth(j-a)) | 455 K/W; quantifies junction-to-ambient heat rise under steady-state operation |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node during Zener operation |
| 2 | Not Connected (n.c.) | Electrically isolated internal pad; no circuit function or routing required |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HTRB, and ESD robustness |
| Low-leakage Zener operation | 5 µA IR at VR = 1 V enables energy-efficient voltage monitoring in always-on domains |
| Stable low-voltage regulation | 3.3 V ±2 % with −2.4 mV/K TC supports accurate biasing of 3.3 V logic and analog interfaces |
| High pulse power capability | 40 W non-repetitive peak reverse power (tp = 100 µs) handles ISO 7637-2 transients |
| Miniature SMT footprint | SOT323 package allows dense placement in space-constrained ECUs and ADAS modules |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing 3.3 V reference for microcontroller ADC inputs in door module electronics. IC Role / Device Role / Timing Role: Zener voltage reference providing stable bias point for analog front-end circuitry. Use Value: ±2 % tolerance and −2.4 mV/K TC minimize measurement drift across −40 °C to +125 °C operating range. |
Use Scenario: Clamping supply rail to protect 3.3 V RS-485 transceiver from ESD-induced overvoltage. IC Role / Device Role / Timing Role: Low-capacitance (6 pF) shunt regulator absorbing fast transients before IC input stage. Use Value: 5 µA leakage preserves low-power sleep mode integrity while enabling sub-100 ns response to surges. |
| Automotive Infotainment Power Sequencing | Medical Wearable Battery Monitoring |
Use Scenario: Providing regulated 3.3 V enable signal to LDOs during cold-cranking (6 V–16 V battery swing). IC Role / Device Role / Timing Role: Zener-based voltage threshold detector triggering power-up sequencing logic. Use Value: 275 mW Ptot and 455 K/W Rth(j-a) sustain reliable operation without heatsinking in confined head unit PCBs. |
Use Scenario: Generating precise 3.3 V reference for lithium-ion cell voltage measurement in patch-style monitors. IC Role / Device Role / Timing Role: Low-drift Zener reference feeding delta-sigma ADC reference input. Use Value: −2.4 mV/K TC and 95 Ω rdiff limit full-scale error to <0.5 % over 0–45 °C clinical operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C3V3-Q | ±5 % tolerance (vs. ±2 %); otherwise identical package, power rating, and thermal specs | Acceptable where cost sensitivity outweighs precision requirement (e.g., non-critical biasing) | Select when tighter voltage accuracy is not required and BOM cost reduction is prioritized |
| MMSZ4685T1G | 3.3 V ±5 %, SOD-123 package, 500 mW Ptot, higher 10 µA IR at VR = 1 V | Higher power handling but larger footprint and looser tolerance; suited for non-automotive industrial use | Choose only if board layout permits SOD-123 and AEC-Q101 compliance is not mandatory |
Compared with BZX84W-B3V3-QX, the BZX84W-C3V3-Q trades voltage accuracy for cost, while MMSZ4685T1G offers higher power but lacks automotive qualification and exhibits higher leakage-making the original part optimal for AEC-Q101-compliant 3.3 V reference designs requiring ±2 % stability.
Availability
BZX84W-B3V3-QX is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and medical wearable battery monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX84W-B3V3-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 technologies.
The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for stable voltage regulation and transient suppression in automotive power systems and industrial control environments.
FAQ
What is the maximum continuous forward current for BZX84W-B3V3-QX?
The device is a Zener diode intended for reverse-bias operation; its absolute maximum forward current is 200 mA per limiting values table, but forward conduction is not its functional mode. In normal regulation use, forward voltage remains ≤0.9 V at 10 mA, and sustained forward bias is discouraged to avoid degradation.
Does BZX84W-B3V3-QX require external series resistance in typical Zener applications?
Yes-standard practice mandates a current-limiting resistor between the supply and cathode to set IZ within 1 mA to 20 mA range. For 3.3 V regulation from a 5 V rail, a 220 Ω resistor establishes ~7.7 mA, ensuring stable operation while staying within 275 mW Ptot and avoiding thermal runaway.
How does the n.c. pin (Pin 2) affect PCB layout or thermal performance?
Pin 2 is electrically unconnected and thermally isolated; it must not be soldered or routed. Its presence maintains mechanical symmetry in the SOT323 mold, but contributes no electrical or thermal path. Layout guidelines specify zero copper connection to Pin 2 to prevent unintended coupling or solder bridging.
Can BZX84W-B3V3-QX replace older BZX84-C3V3 in existing designs?
No direct drop-in replacement: BZX84W-B3V3-QX uses SOT323 (SC-70) with 3-pin layout (A-n.c.-K), whereas legacy BZX84-C3V3 uses SOT23 with 3-pin (A-K-K) configuration. Footprint, pinout, and thermal resistance differ significantly-PCB redesign and validation are required for migration.
BZX84W-B3V3-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):
- 3.3 V
- Tolerance:
- ±2.12%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 95 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-B3V3-QX FAQ
1.How can I place an order for BZX84W-B3V3-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B3V3-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-B3V3-QX reliable?
The price and inventory of BZX84W-B3V3-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-B3V3-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-B3V3-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B3V3-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B3V3-QX?
BZX84W-B3V3-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B3V3-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-B3V3-QX?
For technical support, including BZX84W-B3V3-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B3V3-QX requirements.
6.How does Aetrix verify that BZX84W-B3V3-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-B3V3-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-B3V3-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-B3V3-QX?
All BZX84W-B3V3-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B3V3-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-B3V3-QX part is unused and in its original packaging.
Return procedure for BZX84W-B3V3-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B3V3-QX Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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MM5Z5V1ST1G
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