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LMH1251MT
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Texas Instruments Analog Switches, Multiplexers, TSSOP-24. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+60@@ -0,0 +1,60 @@+# LMH1251MT++**Texas Instruments** · Analog Switches, Multiplexers · TSSOP-24++LMH1251MT from Texas Instruments, in a TSSOP-24. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | H SYNCIN | input | Horizontal sync input for the RGBHV channel; logic low is -0.5 V to 1.5 V and logic high is 3.0 V to VCC+0.5 V. |+| 2 | V SYNCIN | power_in | Vertical sync input for the RGBHV channel; logic low is -0.5 V to 1.5 V and logic high is 3.0 V to VCC+0.5 V. |+| 3 | RIN | input | Red video input of the RGBHV channel, 0.0 V to 0.7 V pk-pk operating range and must be properly terminated. |+| 4 | GIN | input | Green video input of the RGBHV channel, 0.0 V to 0.7 V pk-pk operating range and must be properly terminated. |+| 5 | BIN | input | Blue video input of the RGBHV channel, 0.0 V to 0.7 V pk-pk operating range and must be properly terminated. |+| 6 | GND | power_in | Ground pin. |+| 7 | VCC | power_in | Supply pin, operating range 4.75 V to 5.25 V (absolute maximum 5.5 V). |+| 8 | PR IN | input | PR component video input of the YPBPR channel, -0.35 V to 0.35 V operating range. |+| 9 | PB IN | input | PB component video input of the YPBPR channel, -0.35 V to 0.35 V operating range. |+| 10 | Y | input | Y (luma, including sync) video input of the YPBPR channel, -0.3 V to 0.7 V operating range. |+| 11 | Yc | input | Sync-on-Y connection of the sync processor, shown as 'SYNC on Y' in the application circuits. |+| 12 | GND | power_in | Ground pin. |+| 13 | V SYNCOUT | power_in | Vertical sync output, CMOS rail-to-rail, 3 mA drive; load capacitance must not exceed 6 pF. |+| 14 | H SYNCOUT | output | Horizontal sync output, CMOS rail-to-rail, 3 mA drive; load capacitance must not exceed 6 pF. |+| 15 | REXT | passive | External 10 kΩ 1% resistor (under 100 ppm/°C) sets the internal VREF current; keep video signals away from this high-impedance pin. |+| 16 | GND | power_in | Ground pin. |+| 17 | VCC | power_in | Supply pin, operating range 4.75 V to 5.25 V (absolute maximum 5.5 V). |+| 18 | BOUT | output | Blue video output, 700 mVPP with black level of about 2.1 V, AC-coupled to the next stage. |+| 19 | GOUT | output | Green video output, 700 mVPP with black level of about 2.1 V, AC-coupled to the next stage. |+| 20 | ROUT | output | Red video output, 700 mVPP with black level of about 2.1 V, AC-coupled to the next stage. |+| 21 | POWER SAVE | input | Logic input: high enables low power mode, low disables it; logic low is -0.5 V to 1.5 V and logic high is 3.0 V to VCC+0.5 V. |+| 22 | SD/HD SELECT | bidirectional | Input selecting SD (low) or HD (high) in manual mode; in auto mode it outputs low for SD and high for HD detected, so apply no voltage in auto mode. |+| 23 | AUTO/MANUAL DETECT SELECT | input | High selects automatic SD/HD format detection (recommended), low selects manual mode with format set by pin 22. |+| 24 | INPUT SELECT | input | Low selects the RGBHV input channel, high selects the YPBPR input channel. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | TSSOP-24 |+| Category | Interface |+| Pins | 24 |++## CAD (KiCad official)++- Symbol: `LMH1251MT`+- Footprint: `Package_SO:TSSOP-24_4.4x7.8mm_P0.65mm`+- 3D model: TSSOP-24 (KiCad packages3D, STEP)+- 3D model files: `lmh1251mt-etched.step` / `lmh1251mt-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lmh1251mt.step` / `lmh1251mt.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/lmh1251) (19 pp, sha256 `10e4dbc271aebd97`, retrieved 2026-10-07, tier: lcsc)+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/lmh1251mt-datasheet.pdf)
page.jsonadded+297@@ -0,0 +1,297 @@+{+ "slug": "lmh1251mt",+ "version": "0.1.0",+ "type": "component",+ "description": "Texas Instruments Analog Switches, Multiplexers, TSSOP-24. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",+ "tags": [+ "component",+ "interface",+ "lmh1251mt",+ "factory-2.0.0",+ "extractor-text"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "lmh1251mt.kicad_sym",+ "lmh1251mt.kicad_mod",+ "lmh1251mt.glb",+ "lmh1251mt.step",+ "lmh1251mt.lbr",+ "docs/hero.png",+ "docs/lmh1251mt-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html",+ "lmh1251mt-hero.glb",+ "lmh1251mt-hero.overlay.json"+ ],+ "component": {+ "mpn": "LMH1251MT",+ "manufacturer": "Texas Instruments",+ "package": "TSSOP-24",+ "pin_count": 24,+ "category": "Interface",+ "subcategory": "Analog Switches, Multiplexers",+ "datasheet": "https://www.ti.com/cn/lit/gpn/lmh1251",+ "parts": {+ "symbol": "lmh1251mt.kicad_sym",+ "footprint": "lmh1251mt.kicad_mod",+ "model_3d": "lmh1251mt-hero.glb",+ "model_3d_plain": "lmh1251mt.glb",+ "model_3d_step": "lmh1251mt-etched.step",+ "model_3d_step_plain": "lmh1251mt.step",+ "lbr": "lmh1251mt.lbr"+ },+ "distributor_links": {+ "lcsc": "C1557068",+ "digikey": "LMH1251MT-ND",+ "mouser": "926-LMH1251MT"+ },+ "distributor_check": {+ "checked_at": "2026-10-07T21:27:08Z",+ "source": "Component Ocean /api/assign-pns",+ "digikey": {+ "pn": "LMH1251MT-ND",+ "status": "found",+ "lifecycle": "Obsolete"+ },+ "mouser": {+ "pn": "926-LMH1251MT",+ "status": "found",+ "lifecycle": "Obsolete"+ }+ },+ "pins": [+ {+ "number": "1",+ "name": "H SYNCIN",+ "type": "input",+ "description": "Horizontal sync input for the RGBHV channel; logic low is -0.5 V to 1.5 V and logic high is 3.0 V to VCC+0.5 V."+ },+ {+ "number": "2",+ "name": "V SYNCIN",+ "type": "power_in",+ "description": "Vertical sync input for the RGBHV channel; logic low is -0.5 V to 1.5 V and logic high is 3.0 V to VCC+0.5 V."+ },+ {+ "number": "3",+ "name": "RIN",+ "type": "input",+ "description": "Red video input of the RGBHV channel, 0.0 V to 0.7 V pk-pk operating range and must be properly terminated."+ },+ {+ "number": "4",+ "name": "GIN",+ "type": "input",+ "description": "Green video input of the RGBHV channel, 0.0 V to 0.7 V pk-pk operating range and must be properly terminated."+ },+ {+ "number": "5",+ "name": "BIN",+ "type": "input",+ "description": "Blue video input of the RGBHV channel, 0.0 V to 0.7 V pk-pk operating range and must be properly terminated."+ },+ {+ "number": "6",+ "name": "GND",+ "type": "power_in",+ "description": "Ground pin."+ },+ {+ "number": "7",+ "name": "VCC",+ "type": "power_in",+ "description": "Supply pin, operating range 4.75 V to 5.25 V (absolute maximum 5.5 V)."+ },+ {+ "number": "8",+ "name": "PR IN",+ "type": "input",+ "description": "PR component video input of the YPBPR channel, -0.35 V to 0.35 V operating range."+ },+ {+ "number": "9",+ "name": "PB IN",+ "type": "input",+ "description": "PB component video input of the YPBPR channel, -0.35 V to 0.35 V operating range."+ },+ {+ "number": "10",+ "name": "Y",+ "type": "input",+ "description": "Y (luma, including sync) video input of the YPBPR channel, -0.3 V to 0.7 V operating range."+ },+ {+ "number": "11",+ "name": "Yc",+ "type": "input",+ "description": "Sync-on-Y connection of the sync processor, shown as 'SYNC on Y' in the application circuits."+ },+ {+ "number": "12",+ "name": "GND",+ "type": "power_in",+ "description": "Ground pin."+ },+ {+ "number": "13",+ "name": "V SYNCOUT",+ "type": "power_in",+ "description": "Vertical sync output, CMOS rail-to-rail, 3 mA drive; load capacitance must not exceed 6 pF."+ },+ {+ "number": "14",+ "name": "H SYNCOUT",+ "type": "output",+ "description": "Horizontal sync output, CMOS rail-to-rail, 3 mA drive; load capacitance must not exceed 6 pF."+ },+ {+ "number": "15",+ "name": "REXT",+ "type": "passive",+ "description": "External 10 kΩ 1% resistor (under 100 ppm/°C) sets the internal VREF current; keep video signals away from this high-impedance pin."+ },+ {+ "number": "16",+ "name": "GND",+ "type": "power_in",+ "description": "Ground pin."+ },+ {+ "number": "17",+ "name": "VCC",+ "type": "power_in",+ "description": "Supply pin, operating range 4.75 V to 5.25 V (absolute maximum 5.5 V)."+ },+ {+ "number": "18",+ "name": "BOUT",+ "type": "output",+ "description": "Blue video output, 700 mVPP with black level of about 2.1 V, AC-coupled to the next stage."+ },+ {+ "number": "19",+ "name": "GOUT",+ "type": "output",+ "description": "Green video output, 700 mVPP with black level of about 2.1 V, AC-coupled to the next stage."+ },+ {+ "number": "20",+ "name": "ROUT",+ "type": "output",+ "description": "Red video output, 700 mVPP with black level of about 2.1 V, AC-coupled to the next stage."+ },+ {+ "number": "21",+ "name": "POWER SAVE",+ "type": "input",+ "description": "Logic input: high enables low power mode, low disables it; logic low is -0.5 V to 1.5 V and logic high is 3.0 V to VCC+0.5 V."+ },+ {+ "number": "22",+ "name": "SD/HD SELECT",+ "type": "bidirectional",+ "description": "Input selecting SD (low) or HD (high) in manual mode; in auto mode it outputs low for SD and high for HD detected, so apply no voltage in auto mode."+ },+ {+ "number": "23",+ "name": "AUTO/MANUAL DETECT SELECT",+ "type": "input",+ "description": "High selects automatic SD/HD format detection (recommended), low selects manual mode with format set by pin 22."+ },+ {+ "number": "24",+ "name": "INPUT SELECT",+ "type": "input",+ "description": "Low selects the RGBHV input channel, high selects the YPBPR input channel."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.3",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.3",+ "primary_model": "claude-haiku-5-5",+ "primary_mode": "text",+ "consensus_model": "claude-sonnet-5-5",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [+ "extractor flagged: The connection diagram text extraction is ambiguous: a separate 'GND' label appears between H SYNCOU; The datasheet labels this pin 'SYNC on Y' in the figure and 'Yc' in the connection diagram text, and; The datasheet names pin 23 'AUTO/MANUAL DETECT SELECT' and pin 22 'SD/HD SELECT' with pin 22 being b"+ ],+ "pages_sent": 19,+ "cost_usd": 0.1231,+ "at": "2026-10-07T21:26:47"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/lmh1251",+ "pages": 19,+ "sha256": "10e4dbc271aebd97",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 24,+ "described": 24,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ },+ "models_3d": [+ {+ "file": "lmh1251mt.step",+ "role": "plain",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 6.4,+ 7.8,+ 0.97+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "706322f42d9793ebf28d5b80100a68bfa8769998a00b78acadf7af937fc1454f",+ "checked": "2026-10-07",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ },+ {+ "file": "lmh1251mt-etched.step",+ "role": "eda",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 6.4,+ 7.8,+ 0.97+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "f5923403e3ae642146cc584aa988255207211ba3a4219ccc593c08f6f3248d0e",+ "checked": "2026-10-07",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ }+ ]+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}