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Nexperia USA Inc. BZX84W-C3V6X
- Part No.:
- BZX84W-C3V6X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C3V6X.pdf
- Description:
- DIODE ZENER 3.6V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:9,321
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Product details
Overview
BZX84W-C3V6X from Nexperia is a ±5% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 3.6 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and 90 Ω differential resistance, used for precision low-voltage regulation in power supply feedback loops and reference circuits.
For engineers reviewing the BZX84W-C3V6X datasheet, BZX84W-C3V6X pinout, BZX84W-C3V6X application, or BZX84W-C3V6X equivalent, this page delivers verified Zener parameters, thermal limits, terminal mapping, and real-world use cases for compact DC voltage stabilization in space-constrained designs.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable 3.6 V across its cathode-anode terminals under regulated current conditions. It exhibits a negative temperature coefficient of −2.4 mV/K at 5 mA, enabling predictable drift compensation in temperature-sensitive references.
Designed for surface-mount assembly on FR4 PCBs with single-sided copper, it supports pulsed reverse power up to 40 W (100 µs), forward current up to 200 mA, and junction temperatures up to 150 °C - making it suitable for transient-suppressed biasing and low-noise analog references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.40 V to 3.80 V at IZ = 5 mA - defines regulation window for 3.6 V nominal output |
| Differential Resistance (rdif) | 90 Ω max at IZ = 5 mA - determines load regulation error under current variation |
| Reverse Current (IR) | 5 µA max at VR = 1 V - ensures low leakage in standby or high-impedance bias networks |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on standard FR4 - sets maximum continuous DC power handling |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - defines conduction loss when used in forward-biased protection paths |
| Junction-to-Ambient Thermal Resistance (Rth(j-a)) | 455 K/W - quantifies self-heating rise per watt on standard PCB layout |
| Capacitance (Cd) | 450 pF max at f = 1 MHz, VR = 0 V - impacts high-frequency noise filtering and stability in feedback paths |
Pinout & Package
SOT323 (SC-70) leadless plastic surface-mount package: 1.35 mm × 1.75 mm footprint, 0.95 mm height, 3-terminal configuration with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connects to lower-potential side in Zener regulation mode |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected in PCB layout to avoid parasitic coupling |
| 3 | Cathode (K) | Reverse-bias terminal; connects to higher-potential side and regulates voltage at this node |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables cost-effective selection for non-critical 3.6 V references without trimming |
| 275 mW power rating on FR4 | Supports direct replacement of older 250 mW Zeners without thermal derating in standard layouts |
| 90 Ω differential resistance | Delivers <1% output deviation over ±1 mA load current change in feedback divider networks |
| −2.4 mV/K temperature coefficient | Allows predictable drift modeling for ambient-compensated reference designs |
| 450 pF junction capacitance | Minimizes phase shift in op-amp feedback paths up to ~350 kHz bandwidth |
Applications
| Power Supply Feedback Reference | Low-Voltage Microcontroller Reset Circuit |
|---|---|
Use Scenario: Stabilizing the feedback node of a 3.3 V buck converter using a resistive divider tied to the Zener cathode. IC Role / Device Role: Provides precise 3.6 V reference to set output voltage via optocoupler or error amplifier input. Use Value: Maintains ±1.5% output accuracy over 0–70 °C due to tight VZ tolerance and known TC. | Use Scenario: Generating a clean reset threshold for an ARM Cortex-M0+ MCU operating at 3.3 V. IC Role / Device Role: Acts as voltage-sense element in RC-based reset generator, triggering reset below 2.8 V. Use Value: Ensures reliable reset assertion with <5 µA leakage, preventing false releases during brown-out. |
| ADC Reference Buffer Input | ESD-Protected Signal Clamping |
Use Scenario: Biasing the reference input of a 12-bit SAR ADC requiring stable 3.6 V reference with low noise. IC Role / Device Role: Supplies low-drift, low-capacitance reference voltage to ADC REF+ pin via series resistor. Use Value: Delivers <1 LSB error contribution over temperature due to 90 Ω rdif and −2.4 mV/K TC matching. | Use Scenario: Clamping a 3.3 V I²C bus line against ESD transients while preserving signal integrity. IC Role / Device Role: Shunts >8 kV HBM surges to ground via cathode-anode path, with n.c. pin isolating adjacent traces. Use Value: Limits clamped voltage to ≤3.8 V with <10 ns response, avoiding logic-level violation during fast transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V6 | Same 3.6 V nominal, ±5% tolerance, but in SOT23 package (larger footprint, 350 mW Ptot) | Higher power handling but 0.5 mm larger body; unsuitable for ultra-dense layouts | Select when thermal margin >275 mW is required and board space allows SOT23 |
| MMSZ4685 | 3.6 V nominal, ±5%, SOD-123 package, 500 mW Ptot, 100 Ω rdif | Higher power and larger case; less suitable for high-frequency decoupling due to higher Cd (500 pF) | Choose for industrial environments needing higher surge immunity and relaxed thermal design |
Compared with BZX84W-C3V6X, BZX84-C3V6 offers greater thermal headroom in legacy SOT23 footprints, while MMSZ4685 trades higher capacitance for robustness in harsh electrical environments - both require layout rework and do not match the SOT323 size or 450 pF performance.
Availability
BZX84W-C3V6X is available at Aetrix Electronics and suitable for power supply feedback references, microcontroller reset circuits, ADC reference buffering, and ESD-protected signal clamping requiring stable component supply in high-volume consumer and industrial production.
Supply support for BZX84W-C3V6X 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, cost-efficient voltage regulation in space-constrained consumer, computing, and industrial power management systems.
FAQ
What is the maximum continuous reverse current for stable Zener operation?
The BZX84W-C3V6X is rated for continuous Zener current up to 76 mA at 25 °C ambient, calculated from Ptot = 275 mW and VZ = 3.6 V. Derating begins above 25 °C per the 455 K/W thermal resistance, reaching ~45 mA at 70 °C ambient on standard FR4.
Can Pin 2 be grounded or left floating in PCB layout?
Pin 2 is internally not connected (n.c.) and must remain unconnected in the PCB layout - neither grounded nor tied to any net. Connecting it risks parasitic coupling or mechanical stress-induced failure, as confirmed by Nexperia's package drawings and pinning table.
How does the −2.4 mV/K temperature coefficient affect long-term reference stability?
At 5 mA Zener current, the −2.4 mV/K coefficient causes a −24 mV shift from 25 °C to 125 °C junction temperature, corresponding to −0.67% of 3.6 V. This drift is linear and predictable, enabling software or hardware compensation in precision reference designs.
Is this device qualified for automotive applications?
No. The BZX84W-C3V6X is explicitly marked as non-automotive qualified in the revision history (Rev. 2, January 2023). Nexperia states that automotive alternatives are designated with "-Q" suffixes and undergo separate AEC-Q200 qualification - this part lacks those certifications and is intended for commercial/industrial use only.
BZX84W-C3V6X 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):
- 3.6 V
- Tolerance:
- ±5%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 90 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-C3V6X FAQ
1.How can I place an order for BZX84W-C3V6X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C3V6X 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-C3V6X reliable?
The price and inventory of BZX84W-C3V6X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C3V6X is usually 5 days.
3.What payment methods are accepted for BZX84W-C3V6X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C3V6X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C3V6X?
BZX84W-C3V6X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C3V6X 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-C3V6X?
For technical support, including BZX84W-C3V6X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C3V6X requirements.
6.How does Aetrix verify that BZX84W-C3V6X is sourced from the original manufacturer or authorized distributors?
All BZX84W-C3V6X 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-C3V6X meets industry standards.
7.What is the process for return or replacement of BZX84W-C3V6X?
All BZX84W-C3V6X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C3V6X, 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-C3V6X part is unused and in its original packaging.
Return procedure for BZX84W-C3V6X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C3V6X 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
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