Diodes Incorporated AC847CWQ-7

Overview

AC847CWQ from Diodes Incorporated is an AEC-Q101-qualified NPN bipolar junction transistor in SOT323 package, rated for V_CEO = 45 V, I_C = 100 mA continuous, and h_FE = 420–800 (Group C), designed for automotive switching and audio-frequency amplification circuits.

For engineers reviewing the AC847CWQ datasheet, AC847CWQ pinout, AC847CWQ application, or AC847CWQ equivalent, key selection criteria include its automotive qualification, low V_CE(SAT) (200 mV @ 10 mA/0.5 mA), high f_T (100–300 MHz), robust ESD rating (4 kV HBM), and SOT323 footprint compatibility with space-constrained PCB layouts.

Technical Context

This NPN BJT operates as a discrete current-controlled switch or linear amplifier with DC current gain grouped into Band C (h_FE = 420–800 at V_CE = 5 V, I_C = 2 mA). Its thermal resistance R_θJA = 625 °C/W reflects performance on minimal FR-4 pad layout under still-air conditions.

The device supports pulsed operation (≤300 µs pulse width, ≤2% duty cycle) for breakdown voltage and saturation parameter measurements, and features low noise figure (NF = 10 dB @ V_CE = 5 V, I_C = 200 µA, RS = 2 kΩ), making it suitable for low-level signal amplification in automotive sensor interfaces.

Key Specifications

Pinout & Package

SOT323 is a surface-mount, 3-terminal plastic package measuring 2.15 mm × 2.10 mm × 0.95 mm (L × W × H), with matte tin-plated leads compliant to MIL-STD-202 Method 208 solderability requirements and moisture sensitivity level 1 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN transistor applications.

Compared with BC847CW,115 and MMBT4401LT1G, AC847CWQ uniquely combines AEC-Q101 qualification, high h_FE consistency (C-band), and low-noise performance-making it optimal for automotive signal conditioning where reliability and precision outweigh raw current handling.

Availability

AC847CWQ is available at Aetrix Electronics and suitable for automotive door modules, engine control units, infotainment audio buffers, and ADAS camera power sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AC847CWQ 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and consumer markets.

The AC847CWQ belongs to Diodes' AEC-Q101-qualified small-signal transistor product line, engineered specifically for automotive switching and amplification functions where thermal stability, gain consistency, and ESD robustness are critical.

FAQ

What is the marking code for AC847CWQ on the SOT323 package?

The top-side marking for AC847CWQ is "2D3", followed by a two-character date code (e.g., "E9" for September 2017). This matches the ordering information table in DS39632 Rev. 1–2 and is laser-etched on the molded plastic case per standard SOT323 identification practice.

Does AC847CWQ support operation at 150°C junction temperature?

Yes - AC847CWQ is specified for T_J = –65°C to +150°C and demonstrates stable h_FE and V_CE(SAT) performance across this full range, as confirmed in Figures 4 and 5 of DS39632. Derating of P_D is required above +25°C ambient per Figure 1.

Can AC847CWQ replace AC847BWQ in existing designs?

Yes - both share identical SOT323 package, pinout, and absolute maximum ratings, differing only in h_FE grouping (B: 200–450 vs. C: 420–800). Substitution is electrically valid where higher minimum gain is acceptable or beneficial; no layout or bias changes are needed.

Is the SOT323 footprint compatible with automated pick-and-place equipment?

Yes - the device is explicitly designed for automatic insertion, with matte tin-plated leads meeting MIL-STD-202 Method 208 solderability, and JEDEC-standard SOT323 dimensions (including 0.65 mm lead pitch) ensuring compatibility with industry-standard placement machines and reflow profiles.