Texas Instruments LMT87DCKT

Overview

LMT87DCKT from Texas Instruments is a precision analog-output CMOS temperature sensor in SC70-5 package, delivering ±0.4°C typical accuracy across –50°C to +150°C, with –13.6 mV/°C output slope, 2.7–5.5 V supply range, and 5.4 µA quiescent current - used for real-time thermal monitoring in automotive infotainment, drone battery packs, and industrial motor controllers.

For engineers reviewing the LMT87DCKT datasheet, LMT87DCKT pinout, LMT87DCKT application, or LMT87DCKT equivalent, this page provides verified pin functions, thermal time constant data, load regulation behavior, push-pull drive capability, and validated alternatives for analog temperature sensing in low-power embedded systems.

Technical Context

The LMT87DCKT uses a forward-biased base-emitter junction as its sensing element, buffered by a rail-to-rail CMOS amplifier with push-pull output stage - enabling ±50 µA sourcing/sinking capability and monotonic voltage output over full temperature range. Its transfer function follows a slight parabolic shape (–13.6 mV/°C nominal slope), with accuracy specifications including line regulation (200 µV/V) and load regulation (±1 mV).

Thermal response is optimized via direct die-to-GND thermal path; R_θJA = 275°C/W (SC70), and self-heating error remains below 0.015°C at 5.4 µA supply current and 2 µA load. Power-on time is 0.7–1.9 ms depending on output capacitance (0–1100 pF).

Key Specifications

Pinout & Package

SC70-5 (SOT-5) surface-mount package, 2.00 mm × 1.25 mm body size, 0.65 mm lead pitch, moisture sensitivity level 1 (MSL-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMT87DCKT, LMT86DCKT offers broader supply flexibility at reduced output sensitivity, while LMT84DCKT supports lower minimum voltage but sacrifices both slope and power efficiency - making LMT87DCKT optimal for 3.3 V systems requiring highest thermal resolution per ADC LSB.

Availability

LMT87DCKT is available at Aetrix Electronics and suitable for automotive infotainment, drone battery management, and industrial motor control applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LMT87DCKT 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 specializing in analog and embedded processing technologies, with leadership in precision sensing, power management, and signal chain solutions.

The LMT87DCKT belongs to TI's LMT8x family of analog temperature sensors, designed specifically for high-accuracy, low-power thermal monitoring in space-constrained and battery-sensitive applications - replacing thermistors with linear, calibrated output.

FAQ

What is the absolute maximum supply voltage for LMT87DCKT?

The absolute maximum supply voltage for LMT87DCKT is 6 V, as specified in the Absolute Maximum Ratings table. Operation beyond 5.5 V - the recommended maximum - risks permanent damage. The device is rated for 2.7 V to 5.5 V continuous operation, with guaranteed performance including ±0.4°C accuracy and 5.4 µA quiescent current within that range. Exceeding 6 V voids reliability guarantees.

Does LMT87DCKT require external calibration for ±0.4°C accuracy?

No, LMT87DCKT does not require external calibration to achieve ±0.4°C typical accuracy. This specification is factory-trimmed and verified across temperature and supply voltage during production test. The transfer table (Table 3 in SNIS170E) reflects the calibrated output voltage vs. temperature relationship, and accuracy limits include line regulation effects - no user calibration is needed for standard applications.

Can LMT87DCKT drive an ADC input with 1000 pF sampling capacitance?

Yes, LMT87DCKT can directly drive an ADC input with up to 1100 pF load capacitance without oscillation or settling errors, as confirmed in Section 8.4.3 and Figure 11 of the datasheet. Its push-pull output stage provides sufficient ±50 µA drive strength to charge/discharge such capacitors within its 0.7–1.9 ms power-on window, eliminating need for external op-amp buffering in most SAR ADC interfaces.

How is thermal self-heating error calculated for LMT87DCKT?

Thermal self-heating error for LMT87DCKT is calculated using Equation 7 from the datasheet: ΔT = (V_DD × I_S + (V_DD − V_OUT) × I_L) × R_θJA. At 3.3 V, 5.4 µA supply current, 2.231 V output, and 2 µA load, ΔT ≈ 0.014°C. This negligible error stems from ultra-low power dissipation (≈18 µW) and is already factored into the published accuracy specs.

Is LMT87DCKT pin-compatible with LM35DT/NOPB in SC70 package?

No, LMT87DCKT is not pin-compatible with LM35DT/NOPB. LM35DT uses TO-92 or SOIC-8 packages with different pin count and assignment; no SC70 variant exists for LM35. However, LMT87DCKT is footprint-compatible with LM20 and LM35 *functional equivalents* in terms of board layout spacing - not electrical pin mapping - enabling redesign reuse where analog output polarity and gain are reconfigured in firmware.