Texas Instruments PTMP235DCKT

Overview

PTMP235DCKT from Texas Instruments is a precision analog-output CMOS temperature sensor in SC70-5 package, delivering ±0.5°C typical accuracy from 0°C to +70°C, 10 mV/°C positive-slope output with 500 mV offset at 0°C, and operates from 2.3 V to 5.5 V supply across –40°C to +150°C. It serves as a low-power, high-linearity replacement for thermistors in battery-powered infrastructure monitoring.

For engineers reviewing the PTMP235DCKT datasheet, PTMP235DCKT pinout, PTMP235DCKT application, or PTMP235DCKT equivalent, this page provides verified specifications, validated SC70 pin mapping, confirmed thermal accuracy behavior over full industrial range, and two functionally comparable alternatives with documented differences in gain, supply range, and temperature coverage.

Technical Context

The PTMP235DCKT implements a piecewise-linear analog transfer function with three temperature segments (–40°C to +100°C, +100°C to +125°C, +125°C to +150°C), using inflection points and adjusted gain/offset to maintain ±0.5°C typical accuracy. Its class-AB output driver delivers up to 500 µA while driving capacitive loads ≤1000 pF.

It features 9 µA typical quiescent current, 800 µs power-on settling time to ±0.5°C, and line regulation of ±0.1 °C/V - enabling direct interface to SAR ADC sample-and-hold inputs without external buffering in noise-controlled layouts.

Key Specifications

Pinout & Package

PTMP235DCKT uses the 5-pin SC70 (DCK) surface-mount package, measuring 2.00 mm × 1.25 mm, with exposed pad not electrically connected. Pin 1 and Pin 5 are no-connect (NC) terminals; functional pins are VDD (Pin 4), VOUT (Pin 3), and GND (Pin 2).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog-output temperature-sensing applications.

Compared with PTMP235DCKT, TMP235A2DCKR offers identical performance with assured supply continuity, while LMT86DBVR trades high-temperature linearity for lower power and improved low-end accuracy - making the former the preferred upgrade path and the latter a niche alternative for battery-limited applications below +100°C.

Availability

PTMP235DCKT is available at Aetrix Electronics and suitable for grid infrastructure monitoring, automotive infotainment thermal management, and factory automation PLC modules requiring stable component supply despite its obsolete status - supported via legacy inventory and cross-qualified replacements.

Supply support for PTMP235DCKT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.

The TMP23x product line delivers precision analog-output temperature sensors optimized for cost-sensitive, low-power applications where thermistor replacement and direct ADC interfacing are required - emphasizing accuracy, simplicity, and robustness over digital protocol complexity.

FAQ

What is the operating temperature range of the PTMP235DCKT?

The PTMP235DCKT operates from –40°C to +150°C. Its specified accuracy of ±0.5°C typical applies from 0°C to +70°C, while full-range accuracy is ±2.5°C maximum across –40°C to +150°C. The device uses a piecewise-linear transfer function to maintain fidelity above 100°C, as defined in Table 1 of the SBOS857E datasheet.

Is PTMP235DCKT pin-compatible with other TMP23x variants?

Yes, PTMP235DCKT shares the same 5-pin SC70 (DCK) footprint and pinout as all TMP235 and TMP236 variants in DCK packaging - Pin 1 and Pin 5 are NC, Pin 2 is GND, Pin 3 is VOUT, and Pin 4 is VDD. However, electrical differences exist: TMP236 variants have 19.5 mV/°C gain and require ≥3.1 V supply, so direct substitution requires circuit validation.

What is the output impedance of PTMP235DCKT and how does it affect ADC interfacing?

The PTMP235DCKT has an output impedance of 20 Ω at 100 Hz and 50 Ω at 500 Hz, with load regulation of 1 Ω per 100 µA. This low impedance enables direct connection to SAR ADC inputs with ≤1000 pF total capacitance (including CSAMPLE, CMUX, and CFILTER), minimizing sampling error without requiring an external buffer amplifier.

Does PTMP235DCKT require external passive components for stable operation?

Yes, TI strongly recommends a 0.1 µF ceramic bypass capacitor placed between VDD and GND, as close as possible to the PTMP235DCKT pins. In noisy environments, a 100 Ω resistor in series with the 0.1 µF capacitor further attenuates supply noise. No pull-up/down resistors or output conditioning are needed due to the short-circuit protected, class-AB output stage.

Why is PTMP235DCKT marked as obsolete and what is the recommended replacement?

PTMP235DCKT is obsolete per TI's orderable addendum, with TMP235A2DCKR designated as its active-production replacement. Both share identical SC70-5 packaging, A2 accuracy grade, 10 mV/°C gain, and full –40°C to +150°C operation. Designers should migrate to TMP235A2DCKR to ensure long-term supply, updated manufacturing, and full technical support.