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Nexperia USA Inc. BZX84W-B3V3X
- Part No.:
- BZX84W-B3V3X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B3V3X.pdf
- Description:
- DIODE ZENER 3.3V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,260
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Product details
Overview
BZX84W-B3V3X 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 455 K/W junction-to-ambient thermal resistance; used for precision low-voltage regulation in compact power rails and reference circuits.
For engineers reviewing the BZX84W-B3V3X datasheet, BZX84W-B3V3X pinout, BZX84W-B3V3X application, or BZX84W-B3V3X equivalent, key selection criteria include Zener voltage tolerance (±2%), differential resistance (95 Ω at 5 mA), reverse leakage (5 µA at 1 V), forward voltage (≤0.9 V at 10 mA), and thermal performance on FR4 PCBs.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable 3.3 V output across load and line variations, with temperature coefficient of −2.4 mV/K at 5 mA enabling predictable drift compensation in low-power references. Its SOT323 package supports high-density placement and reflow-compatible assembly.
It exhibits 95 Ω differential resistance at 5 mA, ensuring minimal output impedance under regulation, and 5 µA maximum reverse current at VR = 1 V, supporting low-quiescent-current bias networks. The device is non-automotive qualified and rated for −55 °C to +150 °C ambient operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.23 V to 3.37 V at IZ = 5 mA - defines tight regulation window for 3.3 V rail stabilization |
| Tolerance | ±2% - enables accurate voltage referencing without post-production trimming |
| Differential Resistance (rdif) | 95 Ω max at IZ = 5 mA - ensures low output impedance and minimal load-induced voltage shift |
| Reverse Current (IR) | 5 µA max at VR = 1 V - supports ultra-low-power standby biasing and sensing |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - allows use as low-drop rectifier or clamp in dual-role circuits |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB - sets maximum continuous regulation power in standard layout |
| Junction-to-Ambient Rth | 455 K/W - determines thermal rise per watt on single-sided copper board |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, optimized for high-density PCB layouts and automated reflow assembly. Dimensions: 2.2 mm × 1.35 mm × 0.95 mm (L × W × H), pitch 0.65 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node during regulation |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected in PCB layout to avoid parasitic coupling |
| 3 | Cathode (K) | Reverse-biased terminal; ties to regulated output node and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables direct replacement in 3.3 V reference designs without recalibration or resistor adjustment |
| Low differential resistance (95 Ω) | Maintains regulation accuracy within ±15 mV over 1–10 mA load current variation |
| Low reverse leakage (5 µA @ 1 V) | Minimizes quiescent current in battery-powered voltage monitors and wake-up circuits |
| SOT323 footprint compatibility | Matches industry-standard SC-70 land pattern for drop-in placement on high-density boards |
| −2.4 mV/K temperature coefficient | Provides predictable, linear drift for compensated reference designs operating from −40 °C to +85 °C |
Applications
| Microcontroller Reset Circuit | Low-Voltage Reference Generator |
|---|---|
Use Scenario: Provides clean, stable 3.3 V reset threshold for ARM Cortex-M microcontrollers during power-up and brown-out events. IC Role / Device Role / Timing Role: Zener clamping element establishing precise reset voltage level independent of supply ripple. Use Value: ±2% tolerance eliminates need for external trim resistors; 95 Ω rdif ensures fast release from reset when VCC crosses threshold. |
Use Scenario: Supplies stable 3.3 V reference to ADC input buffers and analog comparators in sensor signal chains. IC Role / Device Role / Timing Role: Passive voltage reference source with defined temperature drift for analog front-end calibration. Use Value: −2.4 mV/K coefficient enables first-order temperature compensation; 5 µA leakage avoids loading high-impedance op-amp inputs. |
| USB-C Power Negotiation Clamp | IoT Node Battery Monitor |
Use Scenario: Clamps CC line voltage during USB-C PD communication to prevent overvoltage damage to controller GPIOs. IC Role / Device Role / Timing Role: Fast-acting overvoltage protection element limiting CC line to 3.3 V during hot-plug transients. Use Value: ≤0.9 V forward voltage allows bidirectional clamping; SOT323 size fits adjacent to USB-C connector routing. |
Use Scenario: Monitors lithium coin-cell voltage (2.0–3.3 V range) in BLE beacon firmware using ADC with internal reference. IC Role / Device Role / Timing Role: Low-leakage Zener providing known reference point against which battery voltage is measured. Use Value: 5 µA max reverse current extends shelf life beyond 10 years; 275 mW rating supports brief 10 mA test pulses. |
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-7-F | 3.3 V ±5%, 350 mW Ptot, 100 Ω rdif, SOT-323 package | Higher power rating but looser tolerance; less suitable for precision references | Select when higher surge capability is needed and ±5% regulation is acceptable |
| Vishay BZX84-C3V3 | 3.3 V ±5%, same SOT323 package, 200 mW Ptot, 90 Ω rdif | Lower power rating and wider tolerance; higher reverse leakage (10 µA) | Choose for cost-sensitive, non-critical biasing where ±5% is sufficient |
Compared with BZX84W-B3V3X, the MMBZ5226BS-7-F offers higher surge resilience but sacrifices voltage accuracy, while the BZX84-C3V3 reduces cost at the expense of regulation stability and thermal margin-making the BZX84W-B3V3X optimal for space-constrained, precision 3.3 V reference designs.
Availability
BZX84W-B3V3X is available at Aetrix Electronics and suitable for microcontroller reset circuits, low-voltage reference generators, and USB-C power negotiation clamps requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for BZX84W-B3V3X 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, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, high-reliability voltage regulation in space-constrained SMT applications with strict thermal and parametric consistency requirements.
FAQ
What is the maximum reverse current for BZX84W-B3V3X at 1 V applied?
The maximum reverse current (IR) is 5 µA at VR = 1 V and Tj = 25 °C, as specified in Table 7 of the datasheet. This low leakage supports energy-efficient bias networks and extends battery life in always-on monitoring circuits.
Can BZX84W-B3V3X be used in place of a 3.3 V shunt regulator IC?
Yes, it functions as a passive shunt regulator with 3.3 V nominal Zener voltage, but requires an external current-limiting resistor. Unlike active IC regulators, it lacks current limiting or thermal shutdown, so design must ensure IZ stays within 1–20 mA and Ptot ≤ 275 mW.
Is the n.c. pin (pin 2) electrically isolated or internally tied?
Pin 2 is explicitly marked "not connected" in Table 2 and has no internal connection. It must remain unconnected on the PCB; soldering or routing to this pad may introduce parasitic capacitance or mechanical stress affecting regulation stability.
What is the thermal resistance when mounted on a standard FR4 PCB?
The junction-to-ambient thermal resistance (Rth(j-a)) is 455 K/W under standard mounting conditions: FR4 PCB, single-sided copper, tin-plated, and standard SOT323 footprint per Figure 9. This value assumes natural convection and no additional copper pour or thermal vias.
BZX84W-B3V3X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±2%
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B3V3X FAQ
1.How can I place an order for BZX84W-B3V3X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B3V3X 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-B3V3X reliable?
The price and inventory of BZX84W-B3V3X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B3V3X is usually 5 days.
3.What payment methods are accepted for BZX84W-B3V3X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B3V3X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B3V3X?
BZX84W-B3V3X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B3V3X 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-B3V3X?
For technical support, including BZX84W-B3V3X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B3V3X requirements.
6.How does Aetrix verify that BZX84W-B3V3X is sourced from the original manufacturer or authorized distributors?
All BZX84W-B3V3X 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-B3V3X meets industry standards.
7.What is the process for return or replacement of BZX84W-B3V3X?
All BZX84W-B3V3X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B3V3X, 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-B3V3X part is unused and in its original packaging.
Return procedure for BZX84W-B3V3X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B3V3X Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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