component
LMH1251MT
Public Made by Adomby adom
Texas Instruments Analog Switches, Multiplexers, TSSOP-24. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLMH1251MT
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lmh1251mt.step/lmh1251mt.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (19 pp, sha256
10e4dbc271aebd97, retrieved 2026-10-07, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).