My Inquiry
My Account
Nexperia USA Inc. BZX84W-B3V3-QF
- Part No.:
- BZX84W-B3V3-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B3V3-QF.pdf
- Description:
- DIODE ZENER 3.3V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,258
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX84W-B3V3-QF from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 3.3 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-B3V3-QF datasheet, BZX84W-B3V3-QF pinout, BZX84W-B3V3-QF application, or BZX84W-B3V3-QF equivalent, key selection criteria include Zener voltage tolerance (±2 %), low differential resistance (95 Ω at 5 mA), reverse leakage (5 µA at 1 V), thermal resistance (455 K/W), and AEC-Q101 qualification status.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining a stable 3.3 V reference across its cathode-anode terminals under reverse-biased conditions with current ≥1 mA. Its temperature coefficient is −2.4 mV/K at 5 mA, indicating predictable negative drift with junction temperature rise.
The SOT323 package enables high-density PCB layouts while supporting reflow and wave soldering per JEDEC standards. With a non-repetitive peak reverse power dissipation of 40 W (100 µs pulse), it withstands transient surges without degradation when properly heatsinked on FR4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.23 V to 3.37 V at IZ = 5 mA - ensures tight regulation window for precision 3.3 V rail referencing |
| Tolerance | ±2 % - reduces binning requirements and improves system-level voltage accuracy without trimming |
| Differential Resistance (rdif) | 95 Ω max at IZ = 5 mA - limits output impedance for stable regulation under load variation |
| Reverse Leakage (IR) | 5 µA max at VR = 1 V - minimizes quiescent current in always-on bias networks |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 - defines continuous DC power handling in standard PCB mounting |
| Junction Temperature (Tj) | −55 °C to +150 °C - supports operation in under-hood automotive environments |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HTOL, ESD, and temperature cycling |
Pinout & Package
SOT323 (SC-70) surface-mount plastic package with 3 leads; leadless construction optimized for automated assembly and space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internally isolated terminal; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress |
| 3 | Cathode (K) | Zener breakdown terminal; connected to regulated voltage node and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 compliant - meets stress-test requirements for automotive electronics deployment |
| Voltage tolerance | ±2 % (B-series) - tighter than standard ±5 % Zeners, reducing need for post-production calibration |
| Thermal resistance | 455 K/W (junction-to-ambient) - enables predictable derating curves for ambient temperatures up to +105 °C |
| Low capacitance | 6 pF at f = 1 MHz, VR = 0 V - preserves signal integrity in high-frequency clamp or reference applications |
| Pulse surge capability | 40 W non-repetitive peak power (100 µs) - absorbs ESD transients and switching spikes without failure |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 3.3 V reference for microcontroller ADC inputs and CAN transceiver biasing in BCM subassemblies. IC Role / Device Role / Timing Role: Shunt voltage reference diode regulating supply rail for analog front-end circuitry. Use Value: ±2 % tolerance ensures consistent ADC full-scale accuracy across temperature and unit variance without software compensation. |
Use Scenario: Clamping sensor output signals (e.g., thermistor bridges or Hall-effect outputs) to prevent overvoltage damage to downstream op-amps. IC Role / Device Role / Timing Role: Passive overvoltage protection element placed at signal path input. Use Value: 5 µA leakage at 1 V ensures minimal loading on high-impedance sensor sources while enabling fast response to transients. |
| Consumer USB-C Power Negotiation Circuit | Medical Wearable Low-Power Bias Network |
Use Scenario: Generating precise 3.3 V reference for USB PD controller VBUS monitoring comparators in portable chargers. IC Role / Device Role / Timing Role: Voltage reference source for analog comparator threshold setting. Use Value: −2.4 mV/K temperature coefficient allows predictable offset correction in firmware over operating range. |
Use Scenario: Establishing stable bias points for ultra-low-power analog front-ends in battery-operated ECG monitors. IC Role / Device Role / Timing Role: Low-quiescent-current Zener shunt regulator in micropower supply chain. Use Value: 275 mW Ptot rating permits safe operation at 100 µA–1 mA currents typical in wearable sleep-mode circuits. |
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 %); identical package, power rating, and thermal specs | Acceptable where system-level calibration compensates for wider voltage spread | Select for cost-sensitive consumer applications where absolute 3.3 V accuracy is secondary to BOM simplification |
| MMSZ4685T1G | 3.3 V nominal, ±5 %, SOD-123 package; higher Ptot = 500 mW but larger footprint and no AEC-Q101 qualification | Used in industrial power supplies requiring higher surge margin but not automotive compliance | Choose only if board space allows SOD-123 and AEC-Q101 is not required; not drop-in compatible due to package and qualification gap |
Compared with BZX84W-B3V3-QF, the BZX84W-C3V3-Q offers lower cost at the expense of regulation precision, while MMSZ4685T1G trades automotive qualification and miniaturization for higher power headroom-making the BZX84W-B3V3-QF optimal for space-constrained, safety-critical automotive subsystems.
Availability
BZX84W-B3V3-QF is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, USB-C power negotiation circuits, and medical wearable bias networks requiring stable component supply with guaranteed AEC-Q101 compliance.
Supply support for BZX84W-B3V3-QF 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 automotive-grade Zener diode product line, engineered specifically for robust voltage reference and clamping in harsh-environment electronic control units.
FAQ
What is the maximum continuous reverse current this Zener can handle at 25 °C?
The BZX84W-B3V3-QF supports a maximum continuous reverse current of 200 mA, derived from its 275 mW total power dissipation rating and 3.3 V Zener voltage (IZmax ≈ Ptot/VZ). This assumes ambient temperature remains at 25 °C on a standard FR4 PCB; derating applies above that temperature per the 455 K/W thermal resistance.
Is Pin 2 electrically functional or purely mechanical?
Pin 2 is explicitly marked "n.c." (not connected) in Nexperia's official pinning diagram and has no internal semiconductor connection. It serves only as a mechanical anchor during SMT placement and must remain unconnected on the PCB layout to prevent unintended parasitic paths or thermal stress concentration.
How does the −2.4 mV/K temperature coefficient affect regulation stability?
The −2.4 mV/K coefficient means the Zener voltage decreases by approximately 2.4 mV per Kelvin rise in junction temperature. At 5 mA test current, this results in a ~12 mV drop from 25 °C to 85 °C ambient-within the ±2 % tolerance band-enabling predictable, uncompensated operation across automotive temperature ranges.
Can this part replace older BZX84C3V3 in existing designs?
No direct replacement: BZX84W-B3V3-QF uses SOT323 (3-pin) packaging with Pin 2 n.c., whereas BZX84C3V3 uses SOT23 (3-pin) with all pins functional. Footprint, soldering profile, and pin mapping differ; redesign of land pattern and schematic symbol is required for migration.
BZX84W-B3V3-QF 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-QF FAQ
1.How can I place an order for BZX84W-B3V3-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B3V3-QF 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-QF reliable?
The price and inventory of BZX84W-B3V3-QF 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-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-B3V3-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B3V3-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B3V3-QF?
BZX84W-B3V3-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B3V3-QF 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-QF?
For technical support, including BZX84W-B3V3-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B3V3-QF requirements.
6.How does Aetrix verify that BZX84W-B3V3-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-B3V3-QF 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-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-B3V3-QF?
All BZX84W-B3V3-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B3V3-QF, 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-QF part is unused and in its original packaging.
Return procedure for BZX84W-B3V3-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B3V3-QF Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
