L293D

@@ -0,0 +1,60 @@+# L293D++**Texas Instruments** · Quad half-H driver (dual H-bridge) · PDIP-16++Four half-H drivers in one DIP-16, the classic way to spin small DC and bipolar stepper motors from a microcontroller. The four channels pair into two full H-bridges, each pair gated by an enable (1,2EN and 3,4EN), so it runs two DC motors bidirectionally or one bipolar stepper. Unlike the plain L293, the D version has the flyback clamp diodes built in, so inductive loads like relays, solenoids, and motors need no external diodes. It sources up to 600 mA per channel (1.2 A peak) with a separate motor supply (VCC2) up to 36 V and 5 V logic (VCC1). The four center GND pins double as a heat sink.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | 1,2EN | input | Active-high enable for driver channels 1 and 2. When high, drivers 1 and 2 are enabled and outputs track their inputs; when low, outputs 1Y and 2Y are in high-impedance (off). TTL compatible, tolerant up to 7 V. |+| 2 | 1A | input | Noninverting driver input for channel 1. TTL-compatible logic input; VIH ≥ 2.3 V, VIL ≤ 1.5 V. Controls state of output 1Y when 1,2EN is high. |+| 3 | 1Y | output | Half-H driver output for channel 1. Totem-pole output with Darlington sink and pseudo-Darlington source, supplies up to 600 mA continuous / 1.2 A peak at VCC2 (4.5 V to 36 V). Internal output clamp diodes provide inductive-transient suppression on L293D. |+| 4 | GND | power_in | Device ground and heat-sink pin. Connect to PCB ground plane with multiple solid vias; pins 4, 5, 12, and 13 are all tied to the internal heat-sink lead frame and share thermal duty. |+| 5 | GND | power_in | Device ground and heat-sink pin. Connect to PCB ground plane with multiple solid vias; pins 4, 5, 12, and 13 are all tied to the internal heat-sink lead frame and share thermal duty. |+| 6 | 2Y | output | Half-H driver output for channel 2. Totem-pole output with Darlington sink and pseudo-Darlington source, supplies up to 600 mA continuous / 1.2 A peak at VCC2 (4.5 V to 36 V). Internal output clamp diodes provide inductive-transient suppression on L293D. |+| 7 | 2A | input | Noninverting driver input for channel 2. TTL-compatible logic input; VIH ≥ 2.3 V, VIL ≤ 1.5 V. Controls state of output 2Y when 1,2EN is high. |+| 8 | VCC2 | power_in | Output-stage (driver) supply, 4.5 V to 36 V. Sets the swing of all four Y outputs and supplies motor/load current up to 600 mA continuous per channel (1.2 A peak) on L293D. Bypass locally to GND with bulk + ceramic capacitors. |+| 9 | 3,4EN | input | Active-high enable for driver channels 3 and 4. When high, drivers 3 and 4 are enabled and outputs track their inputs; when low, outputs 3Y and 4Y are in high-impedance (off). TTL compatible, tolerant up to 7 V. |+| 10 | 3A | input | Noninverting driver input for channel 3. TTL-compatible logic input; VIH ≥ 2.3 V, VIL ≤ 1.5 V. Controls state of output 3Y when 3,4EN is high. |+| 11 | 3Y | output | Half-H driver output for channel 3. Totem-pole output with Darlington sink and pseudo-Darlington source, supplies up to 600 mA continuous / 1.2 A peak at VCC2 (4.5 V to 36 V). Internal output clamp diodes provide inductive-transient suppression on L293D. |+| 12 | GND | power_in | Device ground and heat-sink pin. Connect to PCB ground plane with multiple solid vias; pins 4, 5, 12, and 13 are all tied to the internal heat-sink lead frame and share thermal duty. |+| 13 | GND | power_in | Device ground and heat-sink pin. Connect to PCB ground plane with multiple solid vias; pins 4, 5, 12, and 13 are all tied to the internal heat-sink lead frame and share thermal duty. |+| 14 | 4Y | output | Half-H driver output for channel 4. Totem-pole output with Darlington sink and pseudo-Darlington source, supplies up to 600 mA continuous / 1.2 A peak at VCC2 (4.5 V to 36 V). Internal output clamp diodes provide inductive-transient suppression on L293D. |+| 15 | 4A | input | Noninverting driver input for channel 4. TTL-compatible logic input; VIH ≥ 2.3 V, VIL ≤ 1.5 V. Controls state of output 4Y when 3,4EN is high. |+| 16 | VCC1 | power_in | Logic supply for internal input translation, 4.5 V to 7 V (nominal 5 V). Kept separate from VCC2 to minimize device power dissipation. Bypass locally to GND with a ceramic capacitor. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Quadruple half-H driver |+| Configuration | 4 half-bridges (2 full H-bridges) |+| Output current | 600 mA/ch (1.2 A peak) |+| Motor supply (VCC2) | up to 36 V |+| Logic supply (VCC1) | 4.5-7 V |+| Clamp diodes | internal (the D) |+| Enables | 1,2EN and 3,4EN |+| Package | PDIP-16 (GND = heat sink) |++## Ordering variants++- `L293DNE (PDIP-16)`+- `L293DNEE4 (PDIP-16)`++## CAD (KiCad official)++- Symbol: `Driver_Motor:L293D`+- Footprint: `Package_DIP:DIP-16_W7.62mm`+- 3D model: DIP-16 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/l293d.pdf) (19 pp, sha256 `ee1e8923495a2c0d`, 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/l293d-datasheet.pdf)

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