# LM2907N

**Texas Instruments** · Pre-ordered Chips · DIP-14

LM2907N from Texas Instruments, in a DIP-14. 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 | TACH+ | input | Positive terminal for the input signal that leads to the noninverting terminal of the internal Schmitt-Trigger comparator. |
| 2 | CP1 | output | A capacitor placed on this pin will be charged up to VCC/2 by a constant current source of 180 µA typical at the start of every positive half cycle, and is discharged the same amount at the same rate at the beginning of negative half cycles. |
| 3 | CP2 | output | The charge pump sources current out of this pin equal to the absolute value of the capacitor current on CP1, and a resistor and capacitor in parallel connected to this pin filter the current pulses into the output voltage. |
| 4 | IN+ | input | Noninverting input to the high gain op amp. |
| 5 | EMIT | output | The emitter of the bipolar junction transistor. |
| 6 | NC | unconnected | No connect. |
| 7 | NC | unconnected | No connect. |
| 8 | COL | input | The collector of the bipolar junction transistor; the collector may be taken above VCC up to a maximum VCE of 28 V. |
| 9 | V+ | power_in | Supply voltage; the absolute maximum supply voltage is 28 V. |
| 10 | IN- | input | Inverting input to the high gain op amp. |
| 11 | TACH- | input | Negative terminal for the input signal that leads to the noninverting terminal of the internal Schmitt-Trigger comparator. |
| 12 | GND | power_in | Ground. |
| 13 | NC | unconnected | No connect. |
| 14 | NC | unconnected | No connect. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | DIP-14 |
| Category | Interface ICs |
| Pins | 14 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage |  |  |  | 28 | V |  | 5 |
| Collector voltage |  |  |  | 28 | V |  | 5 |
| Differential input voltage |  |  |  | 28 | V | Tachometer, op amp, and comparator | 5 |
| Input voltage, tachometer |  | 0 |  | 28 | V | LM2907 (14), LM2917 (14) | 5 |
| Input voltage, op amp and comparator |  | 0 |  | 28 | V |  | 5 |
| Power dissipation |  |  |  | 1580 | mW | LM29x7 (14) | 5 |
| Soldering temperature, PDIP |  |  |  | 260 | °C | PDIP package, soldering 10 s | 5 |
| Operating temperature | TJ | -40 |  | 85 | °C |  | 5 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 5 |
| ESD human-body model |  | -1000 |  | 1000 | V | HBM, per ANSI/ESDA/JESD22-A114 | 5 |
| ESD charged-device model |  | -250 |  | 250 | V | CDM, per JEDEC JESD22-C101 | 5 |
| Input voltage, tachometer (recommended) |  | 0 |  | 28 | V | LM2907 (14), LM2917 (14) | 5 |
| Output sink current |  |  |  | 50 | mA |  | 5 |
| Input thresholds |  | 10 | 25 | 40 | mV | VIN = 250 mVp-p at 1 kHz | 6 |
| LM29x7 offset voltage (14-pin) |  |  | 3.5 | 10 | mV | VIN = 250 mVp-p at 1 kHz | 6 |
| Input bias current |  |  | 0.1 | 1 | μA | VIN = ±50 mVDC | 6 |
| Output current (I2, I3) | I2, I3 | 140 | 180 | 240 | μA | V2 = V3 = 6 V | 6 |
| Gain constant | K | 0.9 | 1 | 1.1 |  | See (2) | 6 |
| Linearity |  | -1 | 0.3 | 1 | % | fIN = 1 kHz, 5 kHz, or 10 kHz (4) | 6 |
| Input offset voltage | VOS |  | 3 | 10 | mV | VIN = 6 V | 6 |
| Bias current | IBIAS |  | 50 | 500 | nA | VIN = 6 V | 6 |
| Input common-mode voltage |  | 0 |  |  | V | max printed as VCC-1.5 V | 6 |
| Output sink current |  | 40 | 50 |  | mA | VC = 1 | 6 |
| Saturation voltage |  |  | 0.1 | 0.5 | V | ISINK = 5 mA | 6 |
| Saturation voltage |  |  | 1 | 1.5 | V | ISINK = 50 mA | 6 |
| Hysteresis |  |  | 30 |  | mV | VIN = 250 mVp-p at 1 kHz | 6 |
| VOH high level output voltage | VOH |  | 8.3 |  | V | For CP1, VIN = 125 mVDC (2) | 6 |
| VOL low level output voltage | VOL |  | 2.3 |  | V | For CP1, VIN = -125 mVDC (2) | 6 |
| I3 leakage current | I3 |  | 0.1 |  | μA | I2 = 0, V3 = 0 | 6 |
| Voltage gain |  |  | 200 |  | V/mV |  | 6 |
| Output source current |  |  | 10 |  | mA | VE = VCC -2 | 6 |
| Saturation voltage |  |  | 1 |  | V | ISINK = 20 mA | 6 |
| Junction-to-ambient thermal resistance | RθJA |  | 69.1 |  | °C/W | NFF (PDIP), 14 pins | 6 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 64.8 |  | °C/W | NFF (PDIP), 14 pins | 6 |
| Junction-to-board thermal resistance | RθJB |  | 49.1 |  | °C/W | NFF (PDIP), 14 pins | 6 |
| Junction-to-top characterization parameter | ψJT |  | 35.1 |  | °C/W | NFF (PDIP), 14 pins | 6 |
| Junction-to-board characterization parameter | ψJB |  | 49 |  | °C/W | NFF (PDIP), 14 pins | 6 |

## CAD (KiCad official)

- Symbol: `LM2907N`
- Footprint: `Package_DIP:DIP-14_W7.62mm`
- 3D model: DIP-14 (KiCad packages3D, STEP)
- 3D model files: `lm2907n-etched.step` / `lm2907n-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2907n.step` / `lm2907n.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/lit/ds/symlink/lm2907n.pdf) (41 pp, sha256 `40775ae7dd7a5d60`, retrieved 2026-10-30, tier: manufacturer)
- **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/lm2907n-datasheet.pdf)