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3.7 × 3.1 mm 8 pins top-emitting

OSIRE E3731i KRTBI D2LM31.31

3731 · smd · OSP (Open System Protocol) · ams OSRAM

Bus RGB 4.5–5.5 V active

Also sold as OSIRE E3731i, KRTBI D2LM31.31, Q65113A6249, Q65113A6250

At a glance

Colour
RGB— bits per channel
Data
Busaddressed bidirectional bus
Supply
4.5–5.5 Vno backup data line
Size
3.7 × 3.1 × 0.7 mm8 pins · top
Max current
—per-channel not recorded
PWM
—no reset period
Library support
FastLED WLED Adafruit

The automotive one. An AEC-Q102-qualified, 3.7 x 3.15 x 0.65 mm RGB LED with an on-package IC that stores the measured optical data of its three dice, can report its own temperature, and addresses itself on the chain. It has two bidirectional SIO ports and eight pads, not four or six, a separate LED supply (VLED) and IC supply (VDD), and a supply range of 4.5-5.5 V. Operating -40 to +110 degC.

It is not a NeoPixel substitute: nothing here can be driven by bit-banging a 800 kHz pulse train, and the telegram format lives in an application note not held by this catalogue. Included because it is what the car industry actually fits. The two orderable codes differ only in blue brightness binning.

Variants

One row per orderable SKU. Everything not listed is inherited from the part above.

Order codeFaceLensWhite PinsSiliconStatusFirst seenDatasheet
Q65113A6250 — — — 8 — active 2025-04-30 1.2
Wide-bin ordering code.
Q65113A6249 — — — 8 — active 2025-04-30 1.2
Tighter-binned ordering code; blue range differs from the other code.

Pinout

Q65113A6250Q65113A6249
OSIRE E3731i KRTBI D2LM31.31 3731 package, top and side viewPin 1 is ringed. pin 1 VLED (power), pin 2 VDD (power), pin 3 SIO1 (-) (data i/o), pin 4 SIO1 (+) (data i/o), pin 5 NA (no connect), pin 6 SIO2 (+) (data i/o), pin 7 SIO2 (-) (data i/o), pin 8 GND (ground).11 VLED22 VDD33 SIO1 (-)44 SIO1 (+)55 NA66 SIO2 (+)77 SIO2 (-)88 GND3.7 mm3.2 mmtop view0.7 mmside view
  • Power
  • Data
  • No connect
  • Ground
  • Pin 1

Outline and pin positions checked against the manufacturer datasheet (ams OSRAM KRTBI D2LM31.31 v1.2 p21 dimensional drawing, p22 pad numbering (top-side view)). Pad sizes read from the bottom-view drawing and approximate. A small sliver pad on the right edge is drawn on the sheet but not numbered. What this means.

  1. 1 VLED power
  2. 2 VDD power
  3. 3 SIO1 (-) data io
  4. 4 SIO1 (+) data io
  5. 5 NA nc
  6. 6 SIO2 (+) data io
  7. 7 SIO2 (-) data io
  8. 8 GND ground

Protocol — OSP (Open System Protocol)

Timings shown from datasheet.

Dating evidence

Nobody announces these parts, so this records what we can actually cite rather than a release date. Library support proves only that the part existed by that date.

  • 2025-04-30 datasheet revision ams OSRAM KRTBI D2LM31.31 datasheet, version 1.2 ↗ day

Similar parts

Same protocol or package first, then the same data scheme and colour channels.

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