TLC541INSG4 - 8-Bit 40kSPS 11-Ch Serial ADC | Texas Instruments
MPN: TLC541INSG4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.85 | $7.85 |
| 10 | $7.1 | $71.00 |
| 100 | $5.95 | $595.00 |
| 500 | $5.1 | $2,550.00 |
| 1,000 | $4.25 | $4,250.00 |
TLC541INSG4 Overview
What is an ADC? An analog-to-digital converter (ADC) is a semiconductor device that transforms continuous analog voltage signals into discrete digital codes, enabling microcontrollers, microprocessors, and DSPs to process real-world signals. Successive-approximation (SAR) ADCs use an internal DAC and comparator to converge on the input voltage bit-by-bit in a fixed number of clock cycles, providing deterministic latency and excellent DC accuracy. The TLC541 belongs to the SAR ADC product family within the broader data-converter (ADC/DAC) category of signal-chain integrated circuits.
Key features include 40 kSPS maximum sampling rate, ±0.5 LSB integral linearity error (0.1953 % typical linearity error), 17 µs conversion time, on-chip sample-and-hold, software-configurable analog channel selection, and a hardware reset input. The serial interface reduces pin count versus parallel-output ADCs and simplifies isolation in industrial designs. Built-in self-test mode verifies internal reference integrity without external instrumentation, supporting safety-critical calibration routines.
The TLC541 uses a switched-capacitor charge-redistribution SAR architecture with an internal reference and sample-and-hold amplifier. Its CMOS implementation yields low analog-input leakage (typically <1 µA) and low digital-interface power draw, allowing direct connection to 5 V microcontrollers such as the TI MSP430 and classic 8051 family. The 20-pin SOIC footprint simplifies PCB layout on standard 0.1" grid prototyping boards.
Typical applications include multi-channel data acquisition front-ends in industrial process control, portable instrumentation with battery monitoring, factory-automation sensor multiplexing, HVAC multi-zone temperature and pressure monitoring, automotive body-controller analog sensing, and medical-grade low-speed signal digitisation where 8-bit resolution is acceptable.
When designing with this device, decouple the analog and digital supplies with separate 0.1 µF ceramic bypass capacitors placed as close as possible to the AVDD and DVDD pins. Use short, guarded analog traces to minimise crosstalk between channels, and add an external RC filter on each analog input when driving from high-impedance sources.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for TLC541INSG4 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TLC541INSG4 (same form factor and footprint) — differing in Analog Input Range, Architecture, Conversion Time, Data Interface, Input Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLC541INS
✅ Drop-In📋 Reference alternative (not in catalog)
TLC542IDWR
✅ Drop-In📋 Reference alternative (not in catalog)
TLC1541IFNG3
✅ Drop-In✓ In Stock
$3.3 / Unit
View Datasheet →TLC1541CDWRG4
✅ Drop-In✓ In Stock
$2.74 / Unit
View Datasheet →TLC541INSG4 Maximum Ratings & Electrical Characteristics
| Number of Bits | 8 |
| Sampling Rate | 40 kSPS |
| Number of Analog Input Channels | 11 (plus 1 internal self-test) |
| Architecture | Successive Approximation (SAR) |
| Data Interface | Serial (SPI/QSPI/MICROWIRE-compatible) |
| Analog Supply Voltage | 5 V |
| Digital Supply Voltage | 4.5 V to 5.5 V |
| Analog Input Range | 0 V to 5 V |
| Conversion Time | 17 µs (typical) |
| Integral Linearity Error (INL) | 0.1953 % typical (±0.5 LSB) |
| Package / Case | 20-SOIC (NS), 0.209" / 5.30 mm body width |
| Operating Temperature | -40 °C to +85 °C |
| Mounting Type | Surface Mount |
| Packaging | Tube |
| RoHS Status | Compliant |
| Input Type | Single-Ended |
TLC541INSG4 Pin Configuration
| Pin 1 | AIN0 — Analog input channel 0 |
| Pin 2 | AIN1 — Analog input channel 1 |
| Pin 3 | AIN2 — Analog input channel 2 |
| Pin 4 | AIN3 — Analog input channel 3 |
| Pin 5 | AIN4 — Analog input channel 4 |
| Pin 6 | AIN5 — Analog input channel 5 |
| Pin 7 | AIN6 — Analog input channel 6 |
| Pin 8 | AIN7 — Analog input channel 7 |
| Pin 9 | AIN8 — Analog input channel 8 |
| Pin 10 | AIN9 — Analog input channel 9 |
| Pin 11 | AIN10 — Analog input channel 10 |
| Pin 12 | REF+ — Positive reference voltage input |
| Pin 13 | REF- — Negative reference voltage input |
| Pin 14 | AVDD — Analog +5V supply |
| Pin 15 | AGND — Analog ground |
| Pin 16 | CS — Chip select (active low) |
| Pin 17 | I/O CLOCK — Serial interface clock input |
| Pin 18 | ADDRESS — Serial channel-address input |
| Pin 19 | DATA OUT — Serial data output |
| Pin 20 | DVDD/DGND — Digital supply / ground (per datasheet) |
Typical Applications
TLC541INSG4 is suitable for 6 applications: Industrial Process Control Data Acquisition, Portable Battery-Operated Instrumentation, HVAC Multi-Zone Sensor Monitoring, Automotive Body Controller Analog Sensing, Medical Low-Speed Signal Digitisation, Factory Automation Sensor Multiplexing.
Industrial Process Control Data Acquisition
The TLC541INSG4's 11 analog input channels and 5 V single-supply operation make it a natural fit for multi-sensor process-control front-ends in PLCs and distributed I/O modules. The 40 kSPS sampling rate easily captures temperature, pressure, and flow-transducer signals with 17 µs conversion time, while the industrial -40 °C to +85 °C temperature range supports unconditioned panel mounting. Place the device between the analog signal-conditioning amplifiers and the host MCU, with the SPI-compatible serial interface connecting directly to standard microcontroller SPI peripherals, simplifying PCB layout versus parallel-output ADCs.
Recommended
Portable Battery-Operated Instrumentation
The TLC541INSG4 supports portable handheld meters and field instruments with its CMOS low-power operation and 5 V single-supply. The 11-channel multiplexer accommodates multi-parameter measurements (voltage, current, temperature) from a single ADC, reducing board area and bill of materials. The on-chip sample-and-hold and software-configurable channel selection simplify firmware sequencing, while the -40 °C to +85 °C industrial temperature rating ensures operation in outdoor or vehicle-mounted enclosures without derating. Designers should add input RC anti-aliasing filters to suppress switching noise from nearby DC-DC converters.
Recommended
HVAC Multi-Zone Sensor Monitoring
Commercial HVAC systems require simultaneous monitoring of multiple temperature, humidity, and pressure zones; the TLC541INSG4's 11 analog inputs map directly to typical 8-10 zone building architectures with spare channels for diagnostics. The 8-bit resolution provides 0.2 °C quantization when paired with 10 mV/°C temperature sensors, sufficient for comfort control rather than laboratory-grade measurement. The serial interface supports isolation barriers via optocouplers, allowing the analog front-end to float at high common-mode voltages from the digital control board.
Recommended
Automotive Body Controller Analog Sensing
Within non-safety-critical automotive body controllers, the TLC541INSG4 digitizes switches, sensors, and battery-monitoring signals. Its industrial -40 °C to +85 °C rating covers most cabin and engine-bay installations, while the 11 channels consolidate wiring harness interfaces at the central body module. The 5 V single-supply aligns with automotive 12 V → 5 V regulator rails. For underhood or AEC-Q100-required applications, designers should migrate to a TI automotive-grade ADC; the TLC541INSG4 itself is not AEC-Q100 qualified.
Recommended
Medical Low-Speed Signal Digitisation
Low-bandwidth medical instrumentation such as patient monitors, infusion pumps, and physiotherapy devices uses the TLC541INSG4 to digitize analog sensor channels at up to 40 kSPS aggregate rate. The 8-bit resolution suits display-oriented measurements (e.g. bar-graph pressure readouts) where clinical-grade accuracy is not required. The serial interface simplifies opto-isolation for patient-safety isolation barriers per IEC 60601, and the SOIC-20 package supports standard SMT assembly lines in FDA-regulated manufacturing.
Recommended
Factory Automation Sensor Multiplexing
Factory-automation I/O modules concentrate 8-16 sensor signals per board; the TLC541INSG4 handles 11 channels per IC, allowing two devices to cover a 22-channel module without external muxes. The 40 kSPS throughput and SPI-compatible serial interface enable deterministic polling cycles aligned with PLC scan times. Industrial temperature rating, 5 V supply tolerance, and the built-in self-test channel support predictive-maintenance diagnostics, while the 20-SOIC package simplifies hand-rework during commissioning.
Recommended
Recommended Products Summary
Engineering reference data for TLC541INSG4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLC541INS | TLC542IDWR | TLC1541IFNG3 | TLC1541CDWRG4 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 20-SOIC (NS) | 20-SOIC (NS) - same | 20-SOIC (DW) - same pin count, different body width | 20-SOIC (NS) - same | 20-SOIC (DW) - same pin count, different body width |
| Resolution | 8-bit | 8-bit | 10-bit | 10-bit | 10-bit |
| Sampling Rate | 40 kSPS | 40 kSPS | 40 kSPS | 38 kSPS | 38 kSPS |
| Analog Input Channels | 11 (+1 internal) | 11 (+1 internal) | 11 (+1 internal) | 11 (+1 internal) | 11 (+1 internal) |
| Supply Voltage | 5 V analog / 4.5-5.5 V digital | 5 V analog / 4.5-5.5 V digital | 5 V analog / 4.5-5.5 V digital | 5 V analog / 4.5-5.5 V digital | 5 V analog / 4.5-5.5 V digital |
| Interface | Serial (SPI-compatible) | Serial (SPI-compatible) | Serial (SPI-compatible) | Serial (SPI-compatible) | Serial (SPI-compatible) |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| RoHS Compliance | Compliant (G4 suffix) | Non-compliant (Pb) | Compliant | Compliant (G3 suffix) | Compliant (G4 suffix) |
Key Differentiators
- 11-channel integrated multiplexer eliminates external analog switch ICs (vs TLC549ID (1-channel))
- Industrial -40 °C to +85 °C temperature range as standard, no -Q1 surcharge (vs Generic 8-bit ADCs rated 0-70 °C only)
- On-chip sample-and-hold eliminates external SHA requirement (vs Discrete SAR ADC + external SHA architectures)
- Hardware reset and self-test channel support predictive-maintenance diagnostics (vs TLC1541 series (no hardware reset))
Design Notes
Decouple AVDD (pin 14) and DVDD with separate 0.1 µF ceramic capacitors placed within 5 mm of each supply pin, plus a 10 µF bulk tantalum or ceramic capacitor on AVDD. Use a ferrite bead or small inductor between analog and digital supplies if switching noise from a shared 5 V regulator is observed on the analog channels. The TLC541 draws typically 8 mA from AVDD at full sampling rate, so the regulator must supply at least 12 mA per device for headroom.
Route analog input traces (pins 1-11) as short and guarded as possible, keeping them away from digital switching lines on the PCB. Place a ground plane under the analog traces and stitch vias around the SOIC-20 footprint to reduce coupling from the serial interface (pins 16-20). For high-impedance sensor sources (>10 kΩ), add a 100 Ω series resistor and 1 nF capacitor to ground on each analog input to limit bandwidth and prevent charge-injection kickback from the internal multiplexer.
Do not leave unused analog inputs floating; tie them to AGND or a mid-supply voltage through a defined source impedance to prevent input-leakage current from causing channel-to-channel crosstalk. The REF+ and REF- pins (12, 13) must be driven from a low-impedance reference (e.g. the internal 2.5 V reference via a buffer) - floating REF- degrades linearity by more than 1 LSB. CS must be held high between conversions and pulsed low only during valid read cycles to avoid spurious channel selection.
The serial interface (CS, I/O CLOCK, ADDRESS, DATA OUT) operates at up to 2.048 MHz clock rate; for cable lengths above 50 mm, add a 33 Ω series damping resistor at the driver end. Keep the I/O CLOCK trace length-matched within 5 mm of the DATA OUT trace to avoid setup/hold violations at the host MCU. If the application requires electrical isolation, use a digital isolator with at least 5 kVrms isolation rating and <25 ns propagation delay.
Compliance Information
G4 suffix indicates green (RoHS-compliant, lead-free) packaging per TI part-number convention. Not AEC-Q100 qualified; select TI automotive-grade ADC for vehicular applications. Halogen-free status not explicitly stated in the verified web data.
