NXP BZX84-C3V9

Mfr. Part

BZX84-C3V9

Manufacturer

Freescale / NXP Semiconductors. Y-IC is a quality distributor for this brand. We supply original, traceable parts and deliver the best products and services to our customers.

Detailed Description

General-purpose SMD Zener diode with nominal 3.9 V breakdown voltage (at a small test current). Compact SOT-23 package for space‑constrained designs. Used for voltage reference, regulation, and protection in low-power circuits. Stock available: 85,400 units.

Key Features

Nominal Zener voltage: 3.9 V class (BZX84-C series, tight tolerance)

Surface-mount package: SOT-23 (TO-236)

Low leakage current and low dynamic impedance

Small footprint and low profile for dense PCBs

RoHS compliant, Pb-free plating; MSL 1 (typically unlimited floor life)

Wide operating temperature range (device-class typical −55 to +150°C)

Polarity band marks the cathode for easy visual orientation

Multi-sourced, industry-standard type for secure supply

Key Advantages

Simple, stable voltage reference without active control

Reliable overvoltage clamp for sensitive nodes

Cost-effective and widely available across multiple manufacturers

Small package minimizes board area and enables high-density layouts

Good line/load regulation at low currents with tight-tolerance “C” grade

Easy replacement and second-sourcing lowers supply risk

Packaging

Type: SOT-23 (also known as TO-236AB; catalog case code may appear as 591)

Material: Molded epoxy/plastic body; matte tin plated leads; Pb-free and RoHS

Size (nominal SOT-23): ~2.9 mm L × 1.3 mm W × 1.0–1.1 mm H

Pin configuration: 3 leads; diode connected between two leads; the third lead is typically not internally connected. Verify exact pin mapping in the datasheet before layout.

Orientation: Cathode indicated by polarity band/laser mark (marking code varies by lot/manufacturer; do not rely on code alone for identification)

Tape-and-reel: 8 mm embossed tape, typically 3000 pcs/reel; cut tape and ammo available on request

Thermal characteristics (typical for SOT-23 class): Junction temperature up to +150°C; junction-to-ambient thermal resistance in free air commonly 500–625 K/W; total power dissipation typically 250–350 mW depending on PCB copper and airflow. Always confirm with the datasheet for your exact build.

Electrical properties (typical for 3.9 V Zener class): VZ ≈ 3.9 V at a small test current (often around 5 mA); tight tolerance “C” bin; low leakage in the microamp range at specified reverse voltage; low dynamic impedance for better regulation. Refer to the datasheet for exact test conditions and limits.

Lifecycle

Status: Active, mainstream Zener diode type; not nearing discontinuation

Cross-reference and alternatives (verify pinout, power rating, tolerance, and test conditions before use):

- Nexperia BZX84-C3V9

- onsemi MMBZ5228BLT1G (SOT-23, 3.9 V class)

- Diodes Incorporated BZX84C3V9-7

- Vishay BZX84C3V9-GS08

- ROHM BZX84C3V9 (and UDZV3.9B in SOD-323 as a smaller-footprint option)

- MCC BZX84C3V9-TP

- Taiwan Semiconductor BZX84C3V9

If you need additional equivalent or automotive-grade options, please contact our sales team via the Y-IC website for personalized recommendations and up-to-date lifecycle status.

Key Application Areas

Voltage reference for bias networks and analog circuits

Line and load regulation in low-power rails

Clamp/overvoltage protection for MCU, GPIO, and sensor inputs

Level shifting and signal conditioning

ESD/transient suppression in low-energy nodes

ADC/DAC reference stabilization

General-purpose protection in portable and battery-powered devices

LED bias stabilization and small-signal circuits

Datasheet

Y-IC hosts the most authoritative, up-to-date datasheet for this product model on our website. We recommend downloading the datasheet directly from this page to confirm pinout, test conditions, tolerances, and thermal limits.

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