Texas Instruments LM35DM/NOPB

Overview

LM35DM/NOPB from Texas Instruments is a precision analog-output centigrade temperature sensor IC with linear +10 mV/°C scaling, ±0.4°C accuracy at 25°C, −55°C to 150°C operating range, and 56 µA quiescent current - used for direct thermal monitoring in power supplies, battery packs, and HVAC control circuits.

For engineers reviewing the LM35DM/NOPB datasheet, LM35DM/NOPB pinout, LM35DM/NOPB application, or LM35DM/NOPB equivalent, key selection criteria include its calibrated Celsius output, low self-heating (0.08°C), TO-220 package thermal performance (R_θJA = 90°C/W), and compatibility with single-supply systems from 4 V to 30 V.

Technical Context

The LM35DM/NOPB implements a delta-V_BE temperature-sensing element buffered by a class-A amplifier, delivering a ratiometric analog voltage directly proportional to junction temperature without external calibration. Its output impedance is 0.1 Ω at 1 mA load, enabling direct connection to ADC inputs or op-amp buffers.

It operates in a single functional mode: continuous analog voltage output. The device draws only 56 µA at 5 V and 25°C, limiting self-heating to <0.1°C in still air, and supports operation across the full −55°C to 150°C range with tested accuracy limits per TI SNIS159H Rev H.

Key Specifications

Pinout & Package

The LM35DM/NOPB is housed in a 3-pin TO-220 package with tab connected to GND; body size 14.986 mm × 10.16 mm; intended for through-hole mounting with heatsink interface capability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM35DZ/NOPB, LM35DM/NOPB offers superior thermal dissipation in high-ambient environments due to TO-220 packaging; compared with ADT7320TRZ-REEL7, it provides simpler analog integration at lower system cost but lacks digital configurability and cold-junction correction.

Availability

LM35DM/NOPB is available at Aetrix Electronics and suitable for power supply thermal monitoring, battery pack temperature sensing, and HVAC system ambient sensing requiring stable component supply across industrial and automotive production cycles.

Supply support for LM35DM/NOPB 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 analog signal chains and power management ICs.

The LM35 series belongs to TI's precision analog temperature sensor product line, designed specifically for direct centigrade measurement in industrial, automotive, and consumer systems where calibration-free accuracy and low power are critical.

FAQ

What is the maximum operating temperature of the LM35DM/NOPB?

The LM35DM/NOPB is rated for continuous operation from −55°C to +150°C. This full-range specification is validated per TI SNIS159H Rev H, with tested accuracy limits applied across the entire span. Its TO-220 package supports this rating via low thermal resistance (R_θJA = 90°C/W), making LM35DM/NOPB suitable for under-hood automotive and high-power industrial applications where junction temperatures approach 150°C.

Does the LM35DM/NOPB require external calibration or trimming?

No, the LM35DM/NOPB does not require external calibration or trimming. It achieves ±0.4°C accuracy at 25°C and ±0.8°C over −55°C to +150°C through wafer-level laser trimming and inherent process matching. TI specifies that no user adjustment is needed - the output voltage follows V_OUT = 10 mV/°C × T with no offset or gain compensation required in the application circuit.

Can the LM35DM/NOPB drive an ADC input directly?

Yes, the LM35DM/NOPB can drive most 10-bit to 16-bit SAR or delta-sigma ADC inputs directly. With a typical output impedance of 0.1 Ω at 1 mA load and maximum output current capability of 10 mA, it maintains linearity into 10 kΩ+ input impedances. For optimal performance, place a 0.1 µF ceramic bypass capacitor between +VS and GND near the device, and route VOUT with minimal trace length to reduce noise pickup.

What is the supply voltage range for the LM35DM/NOPB?

The LM35DM/NOPB operates from a single supply voltage of 4 V to 30 V DC. This wide range supports direct connection to unregulated 5 V, 12 V, and 24 V rails common in industrial controls, automotive subsystems, and power supply feedback loops. Operation below 4 V is not guaranteed, and absolute maximum supply voltage is 35 V per TI's absolute ratings table.

How does the LM35DM/NOPB differ from the LM35DZ/NOPB?

The LM35DM/NOPB and LM35DZ/NOPB share identical electrical specifications (gain, accuracy, supply range, quiescent current), but differ in package: LM35DM/NOPB uses a TO-220 package (14.986 mm × 10.16 mm) with GND-connected tab and R_θJA = 90°C/W; LM35DZ/NOPB uses a TO-92 package (4.30 mm × 4.30 mm) with R_θJA = 180°C/W. The TO-220 variant is preferred for high-ambient or high-dissipation applications.