4-digit 7-segment common-cathode LED display, yellow, 0.39" digit height, 135 mcd. Includes decimal points and a center colon for clock/timer use. Drive with a 74HC595 or NPN transistors at up to 20 mA per segment.
Digit 1 common cathode connection on the BetLux BL-Q39X-42 multiplexed common-cathode display.
Digit 2 common cathode connection on the BetLux BL-Q39X-42 multiplexed common-cathode display.
Shared segment D anode connection for the multiplexed four-digit display.
Extra indicator/dot LED L1 connection shown in the BL-Q39X-42 internal circuit diagram.
Shared segment E anode connection for the multiplexed display.
Digit 3 common cathode connection on the multiplexed display.
Shared decimal-point anode connection.
Digit 4 common cathode connection on the multiplexed display.
Extra indicator/dot LED L3 connection shown in the internal circuit diagram.
Common cathode connection for the extra indicator LEDs shown above L1/L2/L3 in the internal circuit diagram.
Shared segment F anode connection for the multiplexed display.
Extra indicator/dot LED L2 connection shown in the internal circuit diagram.
Shared segment C anode connection for the multiplexed display.
Shared segment A anode connection for the multiplexed display.
Shared segment G anode connection for the multiplexed display.
Shared segment B anode connection for the multiplexed display.
Adafruit product 767 states the sold item is a multiplexed common-cathode display with 8 anodes for the 7 segments plus decimal and cathode sinking per digit; the product page links this BL-Q39A-42 datasheet.
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| Pin 1DIG.1 common cathode | 1 | Unknown | Digit 1 common cathode connection on the BetLux BL-Q39X-42 multiplexed common-cathode display. | |
| Pin 2DIG.2 common cathode | 2 | Unknown | Digit 2 common cathode connection on the BetLux BL-Q39X-42 multiplexed common-cathode display. | |
| Pin 3D | 3 | Unknown | Shared segment D anode connection for the multiplexed four-digit display. | Yellow BL-Q39A-42Y-XX datasheet lists typical forward voltage 2.10 V, max 2.50 V at 20 mA. |
| Pin 4L1 | 4 | Unknown | Extra indicator/dot LED L1 connection shown in the BL-Q39X-42 internal circuit diagram. | LED indicator drive via current-limited anode. |
| Pin 5E | 5 | Unknown | Shared segment E anode connection for the multiplexed display. | Yellow BL-Q39A-42Y-XX datasheet lists typical forward voltage 2.10 V, max 2.50 V at 20 mA. |
| Pin 6DIG.3 common cathode | 6 | Unknown | Digit 3 common cathode connection on the multiplexed display. | |
| Pin 7DP | 7 | USB, Unknown | Shared decimal-point anode connection. | LED segment drive via current-limited anode. |
| Pin 8DIG.4 common cathode | 8 | Unknown | Digit 4 common cathode connection on the multiplexed display. | |
| Pin 9L3 | 9 | Unknown | Extra indicator/dot LED L3 connection shown in the internal circuit diagram. | LED indicator drive via current-limited anode. |
| Pin 10indicator common cathode | 10 | Unknown | Common cathode connection for the extra indicator LEDs shown above L1/L2/L3 in the internal circuit diagram. | |
| Pin 11F | 11 | Unknown | Shared segment F anode connection for the multiplexed display. | Yellow BL-Q39A-42Y-XX datasheet lists typical forward voltage 2.10 V, max 2.50 V at 20 mA. |
| Pin 12L2 | 12 | Unknown | Extra indicator/dot LED L2 connection shown in the internal circuit diagram. | LED indicator drive via current-limited anode. |
| Pin 13C | 13 | Unknown | Shared segment C anode connection for the multiplexed display. | Yellow BL-Q39A-42Y-XX datasheet lists typical forward voltage 2.10 V, max 2.50 V at 20 mA. |
| Pin 14A | 14 | Unknown | Shared segment A anode connection for the multiplexed display. | Yellow BL-Q39A-42Y-XX datasheet lists typical forward voltage 2.10 V, max 2.50 V at 20 mA. |
| Pin 15G | 15 | Unknown | Shared segment G anode connection for the multiplexed display. | Yellow BL-Q39A-42Y-XX datasheet lists typical forward voltage 2.10 V, max 2.50 V at 20 mA. |
| Pin 16B | 16 | Unknown | Shared segment B anode connection for the multiplexed display. | Yellow BL-Q39A-42Y-XX datasheet lists typical forward voltage 2.10 V, max 2.50 V at 20 mA. |
| Common-cathode multiplexed raw display | Unknown | Adafruit product 767 states the sold item is a multiplexed common-cathode display with 8 anodes for the 7 segments plus decimal and cathode sinking per digit; the product page links this BL-Q39A-42 datasheet. | Adafruit states about 15 mA segment drive and up to 20 mA for maximum brightness. |
Digit 1 common cathode connection on the BetLux BL-Q39X-42 multiplexed common-cathode display.
Digit 2 common cathode connection on the BetLux BL-Q39X-42 multiplexed common-cathode display.
Shared segment D anode connection for the multiplexed four-digit display.
Extra indicator/dot LED L1 connection shown in the BL-Q39X-42 internal circuit diagram.
Shared segment E anode connection for the multiplexed display.
Digit 3 common cathode connection on the multiplexed display.
Shared decimal-point anode connection.
Digit 4 common cathode connection on the multiplexed display.
Extra indicator/dot LED L3 connection shown in the internal circuit diagram.
Common cathode connection for the extra indicator LEDs shown above L1/L2/L3 in the internal circuit diagram.
Shared segment F anode connection for the multiplexed display.
Extra indicator/dot LED L2 connection shown in the internal circuit diagram.
Shared segment C anode connection for the multiplexed display.
Shared segment A anode connection for the multiplexed display.
Shared segment G anode connection for the multiplexed display.
Shared segment B anode connection for the multiplexed display.
Adafruit product 767 states the sold item is a multiplexed common-cathode display with 8 anodes for the 7 segments plus decimal and cathode sinking per digit; the product page links this BL-Q39A-42 datasheet.
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