# DG409LEDQ-T1-GE3

**Vishay** · Analog Switches, Multiplexers · TSSOP-16

DG409LEDQ-T1-GE3 from Vishay, in a TSSOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | A0 | input | Address input bit 0 (LSB). TTL/CMOS/LV (3 V) logic compatible digital control input. Selects which of the four differential channel pairs is connected to Da/Db when EN is high. |
| 2 | EN | input | Enable input. When EN = logic low, all switches are OFF regardless of A0/A1. When EN = logic high, the addressed differential channel pair is ON. TTL/CMOS/LV (3 V) compatible. |
| 3 | V- | power_in | Negative analog power supply. Tie to GND for single-supply operation (+3 V to +16 V) or to a negative rail for dual-supply operation (±3 V to ±8 V). V+ to V- rated 18 V max. |
| 4 | S1a | passive | Source pin, channel 1, side A. Analog input/output of differential channel 1 (a-side). Connects to Da when A1=0, A0=0, EN=1. Bidirectional analog signal path with 17 Ω typical on-resistance. |
| 5 | S2a | passive | Source pin, channel 2, side A. Analog input/output of differential channel 2 (a-side). Connects to Da when A1=0, A0=1, EN=1. |
| 6 | S3a | passive | Source pin, channel 3, side A. Analog input/output of differential channel 3 (a-side). Connects to Da when A1=1, A0=0, EN=1. |
| 7 | S4a | passive | Source pin, channel 4, side A. Analog input/output of differential channel 4 (a-side). Connects to Da when A1=1, A0=1, EN=1. |
| 8 | Da | passive | Common drain, side A. Analog output/input of the a-side 4:1 multiplexer; connects to the selected S1a..S4a. Bidirectional; channels conduct equally well in both directions. |
| 9 | Db | passive | Common drain, side B. Analog output/input of the b-side 4:1 multiplexer; connects to the selected S1b..S4b. Bidirectional. |
| 10 | S4b | passive | Source pin, channel 4, side B. Analog input/output of differential channel 4 (b-side). Connects to Db when A1=1, A0=1, EN=1. |
| 11 | S3b | passive | Source pin, channel 3, side B. Analog input/output of differential channel 3 (b-side). Connects to Db when A1=1, A0=0, EN=1. |
| 12 | S2b | passive | Source pin, channel 2, side B. Analog input/output of differential channel 2 (b-side). Connects to Db when A1=0, A0=1, EN=1. |
| 13 | S1b | passive | Source pin, channel 1, side B. Analog input/output of differential channel 1 (b-side). Connects to Db when A1=0, A0=0, EN=1. |
| 14 | V+ | power_in | Positive analog power supply. +3 V to +16 V single-supply, or up to +8 V for ±8 V dual-supply operation. V+ to V- rated 18 V absolute max. |
| 15 | GND | power_in | Digital and logic ground reference for the address (A0/A1) and enable (EN) inputs. |
| 16 | A1 | input | Address input bit 1 (MSB). TTL/CMOS/LV (3 V) compatible digital control input. Together with A0 selects one of the four differential channel pairs when EN is high. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Vishay |
| Package | TSSOP-16 |
| Category | Interface |
| Pins | 16 |

## Ordering variants

Same part, different packaging or reel option.

- `DG409LEDQ-GE3`
- `DG409LEDQ-T1-GE3`
- `DG409LEDY-GE3`
- `DG409LEDY-T1-GE3`
- `DG409LEDN-T1-GE4`

## CAD (KiCad official)

- Symbol: `DG409LEDQ-T1-GE3`
- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`
- 3D model: TSSOP-16 (KiCad packages3D, STEP)
- 3D model files: `dg409ledq-t1-ge3-etched.step` / `dg409ledq-t1-ge3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `dg409ledq-t1-ge3.step` / `dg409ledq-t1-ge3.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Vishay datasheet](docs/dg409ledq-t1-ge3-datasheet.pdf) (18 pp, sha256 `25c17230a1edebf9`, retrieved 2026-08-17, tier: manufacturer)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/dg409ledq-t1-ge3-datasheet.pdf)