7 mm 2‑Digit 7‑Segment LED Display, Common Cathode — 2821AS (Red)🔴

The 2821AS is a compact 2‑digit 7‑segment LED display with a 0.28 inch (7 mm) digit height and common cathode configuration. With bright red emission and excellent contrast from its black surface and white segments, it’s ideal for digital counters, voltmeters, clocks, and general numeric indicators where visibility and small footprint matter.

✅ Key Features

• Common Cathode configuration for straightforward multiplexing and driver IC compatibility
• Ultra bright red emission for clear readability
• 7 mm (0.28 inch) digit height in a compact package
• Standard 2.54 mm pin pitch and 18-pin layout
• High-contrast black surface with white segments

📟 Display Specifications

• Model: 2821AS
• Number of Digits: 2
• Display Type: 7‑segment
• Digit Height: 0.28 inch (7 mm)
• Emission Color: Ultra bright red
• Connection Type: Common Cathode
• Appearance: Black surface with white segments

⚙️ Electrical Characteristics (at 25°C)

• Peak Wavelength (λp): 640 nm
• Forward Voltage (Vf): 1.8 V typical (at 10 mA)
• Reverse Current (IR): ≤ 50 μA (at 5 V reverse)
• Continuous Forward Current: 30 mA per segment
• Peak Forward Current: 200 mA (1/10 duty cycle, 10 kHz)
• Power Dissipation: 100 mW per segment
• Operating Temperature: -20°C to +75°C
• Storage Temperature: -20°C to +85°C
• Soldering Temperature: 230°C for 5 s (1.6 mm from base)

📏 Physical Dimensions

• Overall Dimensions: Approx. 19 mm (W) × 12 mm (H) × 7 mm (D)
• Pin Pitch: 2.54 mm
• Total Pin Count: 18

🔌 Application Notes

• Use appropriate current‑limiting resistors for each segment.
• Suitable for multiplexed driving with common‑cathode LED driver ICs.
• Observe polarity and pinout during installation; avoid exceeding rated currents and temperatures.

📚 Typical Applications

• Digital counters and timers
• Voltmeters and measurement panels
• Clocks and frequency displays
• General numeric indicators