# TM7135

**TM(Shenzhen Titan Micro Elec)** · Analog To Digital Converters (ADCs) · SOP-28

TM7135 from TM(Shenzhen Titan Micro Elec), in a SOP-28. 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 | V- | power_in | Negative supply, referenced to digital ground; operating range -3 to -8 V (typ -5 V). |
| 2 | REF | input | Positive reference voltage input, referenced to analog common; VREF is half of full-scale input (1.0000 V for 2 V range). |
| 3 | ANLG COM | power_in | Analog ground. |
| 4 | INT OUT | output | Integrator output; connect the integrating capacitor CINT (about 0.47 µF). |
| 5 | A/Z | input | Auto-zero input; connect the auto-zero capacitor CAZ (typ 1 µF). |
| 6 | BUF OUT | output | Input buffer output; connect the integrating resistor RINT (100 kΩ for 2 V range). |
| 7 | CREF- | input | Reference capacitor negative connection (CREF typ 1 µF). |
| 8 | CREF+ | input | Reference capacitor positive connection (CREF typ 1 µF). |
| 9 | IN- | input | Negative differential analog input of the voltage to be measured. |
| 10 | IN+ | input | Positive differential analog input of the voltage to be measured. |
| 11 | V+ | power_in | Positive supply, referenced to digital ground; operating range +4 to +6 V (typ +5 V), absolute max +6.0 V. |
| 12 | D5(MSD) | output | Digit select output for the ten-thousands digit (most significant digit). |
| 13 | B1(LSB) | output | BCD data output bit 1 (least significant bit), multiplexed, TTL compatible. |
| 14 | B2 | output | BCD data output bit 2, multiplexed, TTL compatible. |
| 15 | B4 | output | BCD data output bit 4, multiplexed, TTL compatible. |
| 16 | B8(MSB) | output | BCD data output bit 8 (most significant bit), multiplexed, TTL compatible. |
| 17 | D4 | output | Digit select output for the thousands digit. |
| 18 | D3 | output | Digit select output for the hundreds digit. |
| 19 | D2 | output | Digit select output for the tens digit. |
| 20 | D1(LSD) | output | Digit select output for the units digit (least significant digit). |
| 21 | BUSY | output | Status output that is high during integration (from positive integration start to end of de-integration) and low during reverse integration as described. |
| 22 | CLK IN | input | Clock input; clock frequency DC to 200 kHz, high-level input min 2.8 V. |
| 23 | POL | output | Polarity output, high for positive input and low for negative input. |
| 24 | DGTL GND | power_in | Digital ground. |
| 25 | R/H | input | Run/Hold control with internal pull-up: high or floating runs continuously (one conversion per 40002 clock cycles), low holds last result, and a positive pulse over 300 ns restarts conversion. |
| 26 | STROBE | output | Data output strobe with pulse width of half a clock period, giving five negative pulses after each conversion to latch BCD digits from MSD to LSD. |
| 27 | OR | output | Over-range flag output, high when the input reading exceeds the converter count range. |
| 28 | UR | output | Under-range flag output, high when the reading is 9% or less. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TM(Shenzhen Titan Micro Elec) |
| Package | SOP-28 |
| Category | ADC/DAC/Data Conversion |
| Pins | 28 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Positive supply voltage | V+ |  |  | 6 | V | 25°C, VDD=5V | 3 |
| Negative supply voltage | V- | -9 |  |  | V | 25°C, VDD=5V | 3 |
| Operating temperature | Topr | 0 |  | 70 | °C |  | 3 |
| Storage temperature | Tstg | -65 |  | 160 | °C |  | 3 |
| Maximum junction temperature |  |  |  | 150 | °C |  | 3 |
| Power dissipation (plastic package) | PD |  |  | 800 | mW | PLASTIC package | 3 |
| Zero input reading |  | 0 | 0 | 0 | counts | Vin=0.0V, full scale 2V | 4 |
| Ratiometric reading |  | 0.9998 | 0.9999 | 1 | counts | VIN=VREF, full scale 2V | 4 |
| Linearity error |  |  | 0.5 | 1 | count | -2V≤VIN≤+2V | 4 |
| Rollover error |  |  | 0.5 | 1 | count | VIN=2V | 4 |
| Input leakage current | IILK |  | 1 | 10 | pA | VIN=0V, Ta=25℃ | 4 |
| Input leakage current | IILK |  |  | 250 | pA | 0℃≤Ta≤70℃ | 4 |
| Zero reading drift |  |  | 0.5 | 2 | μA/℃ | VIN=0V, 0℃≤Ta≤70℃ | 4 |
| Scale factor temperature coefficient | TC |  | 2 | 5 | ppm/℃ | VIN=2V, 0℃≤Ta≤70℃ | 4 |
| Noise (p-p, not exceeded 95% of time) | en |  | 15 |  | μV | VIN=0.0V, full scale 2V | 4 |
| High-level input voltage | VINH | 2.8 |  |  | V | CLK IN, R/H | 4 |
| Low-level input voltage | VINL |  |  | 2.5 | V | CLK IN, R/H | 4 |
| High-level input current | IINH |  | 0.1 | 10 | μA | VIN=5V (CLK IN, R/H) | 4 |
| Low-level input current | IINL |  | 0.02 | 0.1 | mA | VIN=0V (CLK IN, R/H) | 4 |
| Low-level output voltage | VOL |  | 0.25 | 0.4 | V | IOL=1.6mA | 4 |
| High-level output voltage | VOH | 2.4 | 4.2 |  | V | IOH=-1mA (B1-B8, D1-D5) | 4 |
| High-level output voltage | VOH | 4.9 | 4.99 |  | V | IOH=-10μA (other outputs) | 4 |
| +5V supply voltage range | V+ | 4 | 5 | 6 | V |  | 4 |
| -5V supply voltage range | V- | -3 | -5 | -8 | V |  | 4 |
| +5V supply current | I+ |  | 1.1 | 2 | mA | fc=0, Ta=25℃ | 4 |
| +5V supply current | I+ |  |  | 3 | mA | 0℃≤Ta≤70℃ | 4 |
| -5V supply current | I- |  | 0.8 | 2 | mA | fc=0, Ta=25℃ | 4 |
| -5V supply current | I- |  |  | 3 | mA |  | 4 |
| Clock frequency | fc |  | 120 | 200 | KHz | DC to 200 kHz range | 4 |
| Power dissipation capacitance | Cpd |  | 40 |  | pF |  | 4 |

## CAD (KiCad official)

- Symbol: `TM7135`
- Footprint: `Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm`
- 3D model: SOP-28 (KiCad packages3D, STEP)
- 3D model files: `tm7135-etched.step` / `tm7135-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tm7135.step` / `tm7135.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TM(Shenzhen Titan Micro Elec) datasheet](docs/tm7135-datasheet.pdf) (10 pp, sha256 `49d3563b926cc78c`, retrieved 2026-10-26, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/tm7135-datasheet.pdf)