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Nexperia USA Inc. BZX84W-B3V0X
- Part No.:
- BZX84W-B3V0X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B3V0X.pdf
- Description:
- DIODE ZENER 3V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,109
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Product details
Overview
BZX84W-B3V0X from Nexperia is a ±2% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, providing precise 3.0 V nominal regulation at 5 mA, with 95 Ω differential resistance and −2.1 mV/K temperature coefficient, used for low-power voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the BZX84W-B3V0X datasheet, BZX84W-B3V0X pinout, BZX84W-B3V0X application, or BZX84W-B3V0X equivalent, this page delivers verified Zener parameters, terminal mapping, thermal limits, and direct alternatives for stable 3.0 V reference design in space-constrained SMD layouts.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 3.0 V reference across load and line variations, with specified test current of 5 mA and maximum forward voltage of 0.9 V at 10 mA. Its ±2% tolerance ensures tight regulation accuracy for precision analog circuits.
Thermal resistance is 455 K/W junction-to-ambient on FR4 PCB, limiting continuous dissipation to 275 mW at 25 °C ambient. Non-repetitive peak reverse power reaches 40 W for 100 µs pulses, supporting transient suppression in low-energy surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.0 V at IZ = 5 mA - defines regulated output level for biasing, reference, or clamping |
| Zener Tolerance | ±2% - guarantees voltage deviation within ±0.06 V for high-accuracy feedback loops |
| Differential Resistance | 95 Ω max at IZ = 5 mA - determines regulation stiffness against current variation |
| Temperature Coefficient | −2.1 mV/K - quantifies voltage drift per degree Celsius rise in junction temperature |
| Max Power Dissipation | 275 mW at Tamb = 25 °C - sets upper limit for continuous DC power handling on standard FR4 |
| Reverse Leakage Current | 10 µA max at VR = 1 V - defines off-state leakage impact on high-impedance nodes |
| Forward Voltage | 0.9 V max at IF = 10 mA - constrains forward conduction loss in dual-direction protection schemes |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, 1.3 mm × 1.8 mm footprint, 0.65 mm pitch, and 0.23 mm typical thickness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential side in reverse-bias regulation; carries forward current when forward-biased |
| 2 | Not Connected (n.c.) | Internally unconnected terminal; must remain floating-no PCB trace or solder mask opening required |
| 3 | Cathode (K) | Connects to higher-potential side in reverse-bias mode; defines Zener breakdown polarity and voltage reference node |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOT323 package | Enables placement in dense PCB layouts where height < 0.9 mm and area < 2.5 mm² are critical |
| ±2% voltage tolerance | Reduces need for post-production trimming in voltage reference circuits for ADCs and comparators |
| 95 Ω differential resistance | Maintains regulation error < 50 mV under ±0.5 mA load current shift at 3.0 V output |
| −2.1 mV/K temperature coefficient | Yields < ±15 mV drift over −40 °C to +85 °C ambient, suitable for industrial-grade references |
| 275 mW power rating | Supports 3.0 V/92 mA continuous regulation without heatsinking on standard FR4 |
Applications
| Portable Power Rail Regulation | Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Stabilizing 3.3 V LDO output in battery-powered IoT sensors where supply ripple must stay below 50 mV. IC Role / Device Role / Timing Role: Zener shunt regulator providing low-current reference to monitor rail integrity and trigger brown-out detection. Use Value: Delivers 3.0 V reference with ±0.06 V accuracy and < 10 µA leakage, minimizing quiescent current impact on 10 µA sleep-mode operation. |
Use Scenario: Generating a clean reset threshold for ARM Cortex-M0+ microcontrollers during cold start and brown-out recovery. IC Role / Device Role / Timing Role: Precision voltage clamp defining logic-high threshold for external reset supervisor IC input. Use Value: −2.1 mV/K tempco ensures reset threshold remains within 2.95–3.05 V across −40 °C to +85 °C, preventing spurious resets. |
| ADC Reference Buffer | ESD-Sensitive Signal Clamping |
|
Use Scenario: Biasing the reference input of a 12-bit SAR ADC in medical wearable front-end where gain stability is critical. IC Role / Device Role / Timing Role: Low-noise Zener source establishing fixed 3.0 V reference point for ratiometric conversion. Use Value: 95 Ω dynamic impedance limits reference voltage shift to < 48 mV under 0.5 mA ADC reference current demand. |
Use Scenario: Protecting 3.3 V I²C bus lines from ESD transients while preserving signal integrity in handheld diagnostics equipment. IC Role / Device Role / Timing Role: Bidirectional clamp using anode-cathode configuration to limit voltage excursions above 3.0 V and below −0.9 V. Use Value: 0.9 V forward drop enables symmetrical clamping with minimal distortion during fast 100 ns ESD pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V0 | ±5% tolerance (vs. ±2%), 100 Ω rdif, same 3.0 V nominal, identical SOT323 package | Acceptable where cost sensitivity outweighs regulation accuracy; less suitable for precision feedback | Select for non-critical biasing where ±0.15 V variation is acceptable and BOM cost reduction is prioritized |
| MMSZ4684T1G | ±5% tolerance, 3.0 V nominal, 350 mW Ptot, SOD-123 package (larger, 2.7 × 1.6 mm) | Higher power margin but incompatible footprint; requires PCB redesign | Choose only if thermal headroom > 275 mW is mandatory and board rework is feasible |
Compared with BZX84W-B3V0X, BZX84-C3V0 trades accuracy for cost in identical packaging, while MMSZ4684T1G offers higher power at the expense of size and layout compatibility-neither is pin-compatible nor drop-in.
Availability
BZX84W-B3V0X is available at Aetrix Electronics and suitable for portable power rail regulation, microcontroller reset circuits, ADC reference buffering, and ESD-sensitive signal clamping requiring stable component supply and consistent ±2% Zener tolerance.
Supply support for BZX84W-B3V0X 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, headquartered in Nijmegen, Netherlands.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, accurate voltage regulation in consumer, industrial, and computing applications where SOT323 footprint and tight tolerance are essential.
FAQ
What is the maximum continuous reverse current for stable 3.0 V regulation?
The BZX84W-B3V0X maintains regulation within specification up to 92 mA continuous reverse current, derived from its 275 mW power rating divided by 3.0 V nominal Zener voltage. Exceeding this current risks thermal runaway due to 455 K/W junction-to-ambient resistance on standard FR4 PCB.
Can BZX84W-B3V0X replace a 3.3 V Zener in a 3.3 V rail clamp?
No-BZX84W-B3V0X is rated for 3.0 V nominal breakdown, not 3.3 V. Using it on a 3.3 V rail would cause continuous conduction, exceeding its 275 mW dissipation limit and risking failure. A BZX84W-B3V3 (3.3 V, ±2%) is the correct replacement with matching tolerance and package.
Is the n.c. pin electrically isolated or internally tied?
Pin 2 is confirmed as not connected (n.c.)-it has no internal bond wire or silicon connection. The datasheet explicitly states "not connected" in Table 2, and the simplified outline graphic shows no internal link. It must remain unconnected on PCB to avoid parasitic coupling or mechanical stress.
How does temperature affect regulation accuracy over −40 °C to +85 °C?
With a −2.1 mV/K temperature coefficient, BZX84W-B3V0X exhibits approximately −252 mV total drift across the full range (125 K × −2.1 mV/K), resulting in a regulation band from 2.748 V to 3.000 V. This is verified in Figure 6 of the datasheet for 3.0 V types under varying IZ.
BZX84W-B3V0X 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 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 10 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-B3V0X FAQ
1.How can I place an order for BZX84W-B3V0X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B3V0X 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-B3V0X reliable?
The price and inventory of BZX84W-B3V0X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B3V0X is usually 5 days.
3.What payment methods are accepted for BZX84W-B3V0X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B3V0X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B3V0X?
BZX84W-B3V0X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B3V0X 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-B3V0X?
For technical support, including BZX84W-B3V0X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B3V0X requirements.
6.How does Aetrix verify that BZX84W-B3V0X is sourced from the original manufacturer or authorized distributors?
All BZX84W-B3V0X 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-B3V0X meets industry standards.
7.What is the process for return or replacement of BZX84W-B3V0X?
All BZX84W-B3V0X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B3V0X, 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-B3V0X part is unused and in its original packaging.
Return procedure for BZX84W-B3V0X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B3V0X Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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