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Nexperia USA Inc. BZX84W-C3V3-QF
- Part No.:
- BZX84W-C3V3-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C3V3-QF.pdf
- Description:
- DIODE ZENER 3.3V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,835
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Product details
Overview
BZX84W-C3V3-QF from Nexperia is a ±5 % tolerance Zener diode in SOT323 (SC-70) package, rated for 3.3 V nominal regulation voltage at 5 mA, with 95 Ω differential resistance and −2.4 mV/K temperature coefficient, designed for precision voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the BZX84W-C3V3-QF datasheet, BZX84W-C3V3-QF pinout, BZX84W-C3V3-QF application, or BZX84W-C3V3-QF equivalent, this part supports AEC-Q101-compliant voltage clamping, low-leakage reverse bias operation (5 µA @ 1 V), and high-frequency decoupling in compact PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable 3.3 V regulation across load and line variations, with specified test current of 5 mA and maximum forward voltage of 0.9 V at 10 mA. Its negative temperature coefficient (−2.4 mV/K) enables predictable thermal drift compensation in reference circuits.
The device features low dynamic impedance (95 Ω at IZ = 5 mA), 275 mW total power dissipation on FR4 PCB, and non-repetitive surge capability up to 40 W for 100 µs pulses - enabling robust transient suppression in 12 V automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.3 V at IZ = 5 mA; defines precise regulation point for low-voltage logic supply monitoring |
| Tolerance | ±5 % (C-series); ensures production yield compatibility while maintaining functional margin in 3.3 V rail clamping |
| Differential Resistance | 95 Ω at IZ = 5 mA; limits output voltage variation under ±1 mA load current change to ±95 mV |
| Reverse Leakage Current | 5 µA at VR = 1 V; enables low-power standby operation without significant quiescent drain |
| Total Power Dissipation | 275 mW on FR4 PCB; supports continuous regulation in space-constrained automotive modules |
| Thermal Resistance | 455 K/W junction-to-ambient; requires minimal copper area for thermal management in SMT layout |
| Temperature Coefficient | −2.4 mV/K at IZ = 5 mA; provides predictable voltage drift for temperature-compensated reference designs |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, 1.3 mm × 1.8 mm footprint, 0.65 mm pitch, and 0.25 mm max height - optimized for automated placement and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node during regulation; must be routed with low-inductance trace for ESD immunity |
| 2 | Not Connected (n.c.) | Internal die pad with no electrical connection; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress |
| 3 | Cathode (K) | Reverse-biased terminal; ties to regulated voltage node; serves as primary current path during Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, HAST, and ESD testing per JESD47 |
| Low capacitance | 6 pF at f = 1 MHz, VR = 0 V; preserves signal integrity in high-speed digital I/O protection |
| High surge rating | 40 W non-repetitive peak reverse power at tp = 100 µs; withstands ISO 7637-2 pulse 1/2a transients |
| Stable low-voltage regulation | 3.3 V ±5 % with −2.4 mV/K tempco; enables accurate 3.3 V microcontroller reset threshold generation |
| Compact SMT footprint | SOT323 package (1.3 × 1.8 mm) supports >10k units/in² board density in ADAS domain controllers |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage clamping on LIN bus transceiver supply rail subject to load dump and battery reversal events. IC Role / Device Role / Timing Role: Zener clamp protecting 3.3 V LDO input against >20 V transients. Use Value: Limits peak voltage to ≤4.5 V using 3.3 V Zener knee, preventing LDO damage without adding series resistance. |
Use Scenario: Precision reference for 12-bit ADC measuring thermistor-based temperature in HVAC control unit. IC Role / Device Role / Timing Role: Stable 3.3 V shunt reference replacing higher-cost bandgap ICs. Use Value: Delivers <±0.1% regulation error over −40 °C to +125 °C due to matched tempco and low rdif. |
| USB-C Power Delivery Interface | Smart Meter Voltage Monitoring |
Use Scenario: Overvoltage detection on VBUS sense line during 20 V PD negotiation phases. IC Role / Device Role / Timing Role: Fast-response Zener element triggering comparator when VBUS exceeds 3.6 V. Use Value: 5 µA leakage at 1 V ensures negligible current draw during idle, extending battery life in portable PD analyzers. |
Use Scenario: Secondary regulation for real-time clock (RTC) backup supply derived from main 3.3 V rail. IC Role / Device Role / Timing Role: Low-power shunt regulator maintaining RTC VDD within ±3 % during brownout. Use Value: 275 mW power rating allows sustained operation at 1.5 mA load without thermal derating in sealed meter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5226BS-TP | 3.3 V ±5 %, 350 mW Ptot, 100 Ω rdif, SOT-23 package | Larger footprint (2.9 × 1.3 mm vs. 1.8 × 1.3 mm); higher thermal resistance (350 K/W) | Select when higher power margin is required and board space permits larger package |
| Vishay BZX84-C3V3-TP | 3.3 V ±5 %, 300 mW Ptot, 90 Ω rdif, same SOT323 package but not AEC-Q101 qualified | No automotive qualification; lacks HTOL and TC validation for under-hood use | Select for cost-sensitive industrial applications where AEC-Q101 is not mandated |
Compared with BZX84W-C3V3-QF, the ON Semi part offers higher power headroom but sacrifices board density and thermal performance, while the Vishay part matches form factor but omits automotive reliability validation - making the Nexperia device optimal for space-constrained, safety-critical vehicle ECUs.
Availability
BZX84W-C3V3-QF is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and USB-C power delivery systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX84W-C3V3-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 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 portfolio, engineered specifically for robust voltage regulation and transient suppression in harsh automotive environments.
FAQ
What is the maximum reverse voltage the BZX84W-C3V3-QF can withstand before breakdown?
The BZX84W-C3V3-QF has a nominal Zener voltage of 3.3 V at 5 mA test current, with guaranteed breakdown occurring between 3.10 V and 3.50 V (±5 % tolerance). It is not rated for sustained reverse voltage above its specified VZ; operation beyond 3.50 V risks exceeding power limits unless current is strictly limited by external series resistance.
Does the n.c. pin (pin 2) require any PCB routing or grounding?
No - pin 2 is internally not connected and must remain unconnected on the PCB. Routing or grounding this terminal introduces risk of mechanical stress, solder bridging, or parasitic coupling that may degrade ESD performance or cause intermittent failure. The SOT323 footprint design explicitly isolates this pad.
How does the −2.4 mV/K temperature coefficient affect circuit accuracy over temperature?
At 3.3 V nominal, the −2.4 mV/K coefficient causes approximately −0.3 V drift over a −40 °C to +125 °C range. This is fully characterized and repeatable, enabling first-order compensation in reference designs - for example, pairing with a positive-tempco resistor network to achieve <±0.5 % total error across automotive temperature range.
Can BZX84W-C3V3-QF replace older BZX84-C3V3 variants in existing designs?
Yes - BZX84W-C3V3-QF maintains identical electrical specifications and SOT323 pinout as legacy BZX84-C3V3 parts, but adds AEC-Q101 qualification, tighter thermal resistance control (455 K/W), and improved surge rating (40 W vs. typical 30 W). No layout or schematic changes are needed for drop-in replacement in automotive upgrades.
BZX84W-C3V3-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:
- ±6.06%
- 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-C3V3-QF FAQ
1.How can I place an order for BZX84W-C3V3-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C3V3-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-C3V3-QF reliable?
The price and inventory of BZX84W-C3V3-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-C3V3-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-C3V3-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C3V3-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C3V3-QF?
BZX84W-C3V3-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C3V3-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-C3V3-QF?
For technical support, including BZX84W-C3V3-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C3V3-QF requirements.
6.How does Aetrix verify that BZX84W-C3V3-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-C3V3-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-C3V3-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-C3V3-QF?
All BZX84W-C3V3-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C3V3-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-C3V3-QF part is unused and in its original packaging.
Return procedure for BZX84W-C3V3-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C3V3-QF Tags
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