My Inquiry
My Account
Nexperia USA Inc. BZX84W-C3V3-QX
- Part No.:
- BZX84W-C3V3-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C3V3-QX.pdf
- Description:
- DIODE ZENER 3.3V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:8,421
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX84W-C3V3-QX 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 275 mW total power dissipation and 5 µA reverse current at 1 V, used for precision voltage reference and overvoltage protection in automotive control modules.
For engineers reviewing the BZX84W-C3V3-QX datasheet, BZX84W-C3V3-QX pinout, BZX84W-C3V3-QX application, or BZX84W-C3V3-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 robust circuit design and automotive-grade component selection.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable 3.3 V output across load and line variations, with low dynamic impedance (95 Ω at IZ = 5 mA) ensuring minimal voltage deviation under changing current conditions. Its −2.4 mV/K temperature coefficient indicates predictable, slightly negative drift over temperature-critical for biasing and reference circuits where thermal stability is prioritized.
Qualified per AEC-Q101, it supports operation from −55 °C to +150 °C ambient and withstands non-repetitive surge pulses up to 40 W (100 µs), enabling use in harsh automotive environments including engine control units and body electronics where transient immunity and long-term reliability are mandatory.
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 reference and clamping circuits |
| Tolerance | ±5 % - ensures predictable voltage window (3.10 V to 3.50 V) for functional safety margining in automotive systems |
| Differential Resistance | 95 Ω at IZ = 5 mA - determines output impedance and load regulation error in feedback paths |
| Reverse Current | 5 µA at VR = 1 V - confirms low leakage for standby power integrity in always-on subsystems |
| Total Power Dissipation | 275 mW on FR4 PCB - sets maximum continuous DC or average pulsed power handling in compact SMT layouts |
| Junction Temperature Limit | 150 °C - enables operation in high-temperature under-hood locations without derating below rated power |
| Thermal Resistance (j-a) | 455 K/W - quantifies self-heating rise per watt, critical for thermal design of densely packed PCBs |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, footprint dimensions 2.2 mm × 1.35 mm × 0.95 mm (L × W × H), optimized for automated reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating-no PCB trace or solder joint required |
| 3 | Cathode (K) | Reverse-biased terminal; ties to higher-potential node and serves as regulated output reference point |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine management and ADAS sensor interfaces |
| Low capacitance (6 pF) | Minimizes signal distortion in high-frequency filtering and RF decoupling roles |
| Wide operating temperature range | −55 °C to +150 °C ambient enables deployment in under-hood and battery-management systems |
| Pulse surge capability | Withstands 40 W non-repetitive reverse power surges (100 µs), enhancing ESD and load-dump resilience |
| Standard SOT323 footprint | Ensures compatibility with existing pick-and-place equipment and IPC-compliant reflow profiles |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Provides stable 3.3 V reference for microcontroller ADC inputs monitoring throttle position and coolant temperature. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precision analog ground reference point. Use Value: Maintains <±15 mV regulation accuracy over temperature and supply variation, preventing ADC code errors in closed-loop engine control. |
Use Scenario: Clamps transducer output signals to prevent overvoltage damage to downstream op-amps in 4–20 mA loop receivers. IC Role / Device Role / Timing Role: Reverse-biased overvoltage protection device limiting signal swing to 3.3 V. Use Value: Limits fault energy with 5 µA leakage at 1 V, preserving signal integrity while absorbing transient spikes up to 40 W. |
| Consumer IoT Power Management | Medical Diagnostic Equipment Biasing |
Use Scenario: Regulates bias voltage for low-noise LDO enable circuitry in battery-powered wearable health monitors. IC Role / Device Role / Timing Role: Low-power Zener shunt regulator supplying clean 3.3 V to enable logic. Use Value: Delivers 275 mW dissipation headroom with 455 K/W thermal resistance, enabling reliable operation in sealed enclosures. |
Use Scenario: Sets reference voltage for photodiode amplifier stages in portable ultrasound front-ends. IC Role / Device Role / Timing Role: Precision voltage reference stabilizing amplifier offset and gain calibration points. Use Value: −2.4 mV/K temperature coefficient enables <0.1 % drift over 0–70 °C, meeting Class II medical accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-B3V3-Q | ±2 % tolerance (3.23–3.37 V vs. C-series 3.10–3.50 V); identical package, power, and thermal specs | Higher precision needed for metrology-grade references; tighter tolerance increases cost and reduces availability | Select when absolute voltage accuracy > ±2 % is required and AEC-Q101 compliance remains essential |
| MMSZ4685T1G | 3.3 V ±5 %, SOD-123 package, 500 mW Ptot, 300 Ω rdif, not AEC-Q101 qualified | Higher power handling but larger footprint and no automotive qualification; suitable for industrial bench equipment | Choose only for non-automotive designs requiring higher dissipation and where board space permits SOD-123 |
Compared with BZX84W-C3V3-QX, the BZX84W-B3V3-Q offers tighter voltage control at the expense of reduced supply flexibility, while MMSZ4685T1G trades automotive qualification and compact size for greater power capacity-making the QX variant optimal for space-constrained, safety-critical automotive nodes.
Availability
BZX84W-C3V3-QX is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and medical diagnostic equipment requiring stable component supply with full AEC-Q101 traceability and extended temperature support.
Supply support for BZX84W-C3V3-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 automotive-grade Zener diode product line, engineered specifically for voltage regulation, clamping, and reference functions in demanding vehicular environments where AEC-Q101 compliance and thermal robustness are mandatory.
FAQ
What is the maximum continuous forward current rating for BZX84W-C3V3-QX?
The device is not rated for continuous forward conduction; its primary function is reverse-bias Zener operation. The absolute maximum forward current is 200 mA per limiting values table, but sustained forward bias exceeds intended use and risks degradation. Forward voltage is specified at 10 mA (≤0.9 V), confirming it is not designed as a rectifier.
Does BZX84W-C3V3-QX require external series resistance in regulation circuits?
Yes-standard Zener regulation requires a series current-limiting resistor to set the operating current (typically 5 mA) and absorb input voltage variance. For a 5 V supply, a 340 Ω resistor establishes ~5 mA through the diode, ensuring stable 3.3 V output while staying within 275 mW power limit and maintaining 95 Ω dynamic impedance performance.
How does the "QX" suffix differ from standard "Q" in BZX84W-C3V3-QX?
The "QX" suffix denotes Nexperia's enhanced automotive qualification grade, incorporating additional process controls, extended lifetime testing, and tighter lot-to-lot parametric consistency versus baseline "Q" parts. Both meet AEC-Q101, but QX adds traceability enhancements and extended temperature cycling validation for mission-critical vehicle systems.
Can BZX84W-C3V3-QX be used in parallel for higher power dissipation?
No-Zener diodes exhibit manufacturing spread in breakdown voltage, causing current hogging if paralleled. Even with matched units, thermal runaway occurs due to positive temperature coefficient of dynamic resistance above ~5 V; at 3.3 V, mismatched rdif and thermal coupling make parallel operation unreliable and unsafe beyond datasheet-rated 275 mW.
BZX84W-C3V3-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:
- ±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-QX FAQ
1.How can I place an order for BZX84W-C3V3-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C3V3-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-C3V3-QX reliable?
The price and inventory of BZX84W-C3V3-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-C3V3-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-C3V3-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C3V3-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C3V3-QX?
BZX84W-C3V3-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C3V3-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-C3V3-QX?
For technical support, including BZX84W-C3V3-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C3V3-QX requirements.
6.How does Aetrix verify that BZX84W-C3V3-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-C3V3-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-C3V3-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-C3V3-QX?
All BZX84W-C3V3-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C3V3-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-C3V3-QX part is unused and in its original packaging.
Return procedure for BZX84W-C3V3-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C3V3-QX 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…
