My Inquiry
My Account
Texas Instruments LM26CIM5-BPB/NOPB
- Part No.:
- LM26CIM5-BPB/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM26CIM5-BPB/NOPB.pdf
- Description:
- THERMOSTAT 45DEGC ACT LO SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:495
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM26CIM5-BPB/NOPB from Texas Instruments is a factory-preset, ±3°C accurate undertemperature shutdown thermostat in SOT-23-5 package, with −45°C trip point, active-low open-drain US output, 2.7–5.5 V supply range, and analog VTEMP output for post-assembly verification. It operates across −55°C to +125°C ambient and delivers 16 µA typical supply current.
For engineers reviewing the LM26CIM5-BPB/NOPB datasheet, LM26CIM5-BPB/NOPB pinout, LM26CIM5-BPB/NOPB application, or LM26CIM5-BPB/NOPB equivalent, key selection criteria include trip point accuracy (±3°C), programmable hysteresis (2°C/10°C via HYST pin), VTEMP slope (−10.82 mV/°C), open-drain US functionality, and SOT-23 thermal coupling to PCB leads.
Technical Context
The LM26CIM5-BPB/NOPB implements an integrated temperature sensor, internal voltage reference, DAC, and comparator architecture - all factory-programmed for −45°C undertemperature shutdown. Its digital output is fixed as active-low open-drain US, meaning it asserts LOW when die temperature falls below −45°C and returns HIGH after crossing (−45°C + THYST).
Hysteresis is externally selectable: HYST = GND yields 10°C hysteresis; HYST = V+ yields 2°C hysteresis. The VTEMP pin provides a calibrated analog voltage per the quadratic equation VO = (−3.479×10⁻⁶×(T−30)²) + (−1.082×10⁻²×(T−30)) + 1.8015 V, enabling system-level temperature readback and post-assembly functional test.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Trip Point | −45°C; factory-programmed undertemperature shutdown threshold, verified over −55°C to +110°C operating range |
| Accuracy | ±3°C (−55°C ≤ TA ≤ +110°C); includes sensor, reference, DAC, and comparator offset errors |
| Output Type | Active-low open-drain US; requires external pullup ≥10 kΩ; sinks up to 3.2 mA at 0.4 V |
| Supply Range | 2.7 V to 5.5 V; supports battery-powered and low-voltage industrial systems without regulation |
| Supply Current | 16 µA typical, 40 µA max; enables multi-year operation in always-on thermal monitoring nodes |
| VTEMP Slope | −10.82 mV/°C; enables direct ADC-based temperature measurement with <±3°C error across full range |
| Hysteresis Options | 2°C (HYST = V+) or 10°C (HYST = GND); prevents output chatter near trip point in noisy thermal environments |
Pinout & Package
LM26CIM5-BPB/NOPB is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, with exposed thermal pad connected internally to GND (pin 2) for enhanced thermal coupling to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - HYST | Digital input | Selects hysteresis: GND = 10°C, V+ = 2°C; input leakage <10 µA; VIH = 0.8×V+, VIL = 0.2×V+ |
| 2 - GND | Power ground | Connected to backside of die via lead frame; primary thermal path to PCB; must tie to system ground |
| 3 - VTEMP | Analog output | Quadratic voltage vs. temperature; weak drive (1 µA source / 40 µA sink); requires series R for >100 pF load |
| 4 - V+ | Power supply | 2.7–5.5 V input; requires 0.1 µF bypass capacitor; rejects 400 kHz square-wave noise up to 1 Vp-p |
| 5 - US | Digital output | Active-low open-drain undertemperature shutdown; LOW when T < −45°C; HIGH when T > (−45°C + THYST) |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained thermostat: integrated sensor, reference, DAC, and comparator eliminate discrete BOM and layout complexity |
| VTEMP analog output | Enables post-assembly functional test by forcing VTEMP to trigger US output, verifying sensor + comparator + output chain integrity |
| Factory-programmed trip point | −45°C setpoint is laser-trimmed during manufacture; no calibration needed in end equipment; eliminates field drift concerns |
| Open-drain US output | Allows wired-OR configuration with other shutdown signals and compatibility with 1.8 V–5 V logic families via pullup selection |
| UL recognition | Meets UL 1577 component requirements for isolation safety in industrial and appliance applications |
Applications
| Industrial Process Freeze Protection | Low-Temperature Battery Management |
|---|---|
|
Use Scenario: Monitoring coolant lines in chemical processing plants where fluid freezing must be prevented before reaching −45°C. IC Role / Device Role / Timing Role: Undertemperature shutdown sensor triggering heater activation or flow diversion when die temperature drops below −45°C. Use Value: Prevents pipeline rupture by initiating countermeasures within ±3°C accuracy, leveraging direct thermal coupling of SOT-23 leads to pipe surface. |
Use Scenario: Protecting lithium-thionyl chloride (Li-SOCl₂) batteries in remote metering devices operating down to −55°C ambient. IC Role / Device Role / Timing Role: Active-low US output disables load circuitry when cell temperature falls below −45°C to prevent irreversible capacity loss. Use Value: Extends battery life by enforcing safe discharge cutoff at precisely −45°C, using factory-trimmed accuracy without calibration overhead. |
| Medical Cold Chain Monitoring | Outdoor Telecom Equipment |
|
Use Scenario: Verifying transport temperature integrity for vaccines requiring storage between −50°C and −15°C. IC Role / Device Role / Timing Role: VTEMP output sampled by host MCU ADC confirms real-time temperature; US output triggers alarm if T < −45°C. Use Value: Dual-mode verification (analog readback + digital alert) ensures compliance with WHO cold chain standards using single-component solution. |
Use Scenario: Preventing base station RF amplifier failure in arctic climates where ambient drops below −40°C. IC Role / Device Role / Timing Role: US output disables power to sensitive GaN amplifiers until enclosure warms above −45°C, avoiding condensation-induced failure. Use Value: Eliminates need for external thermistor + comparator; ±3°C accuracy ensures reliable startup while avoiding premature enablement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar undertemperature shutdown applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM26CIM5-DPB/NOPB | −25°C trip point; identical package, pinout, and open-drain US output | Suitable for higher-threshold freeze protection (e.g., HVAC refrigerant lines) | Select when system requires shutdown at −25°C instead of −45°C; no layout change needed |
| MAX6505UTA+T | −45°C trip, push-pull output, 1.7–5.5 V supply, ±2°C accuracy, SOT-23-5 | Eliminates external pullup resistor but lacks VTEMP output for temperature readback | Choose when board space is constrained and analog monitoring is unnecessary; not drop-in due to push-pull vs. open-drain behavior |
Compared with LM26CIM5-BPB/NOPB, LM26CIM5-DPB/NOPB shifts trip point upward by 20°C while preserving all interface and diagnostic capabilities; MAX6505UTA+T trades VTEMP functionality for lower supply voltage and tighter accuracy but requires redesign of output interface due to push-pull drive.
Availability
LM26CIM5-BPB/NOPB is available at Aetrix Electronics and suitable for industrial process freeze protection, low-temperature battery management, medical cold chain monitoring, and outdoor telecom equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM26CIM5-BPB/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 sensing, power management, and industrial interface solutions.
The LM26 product line delivers factory-programmed thermostats for system-level thermal protection, designed specifically for applications demanding high accuracy, zero-calibration operation, and dual-mode (digital + analog) verification in harsh environments.
FAQ
What is the exact trip point and hysteresis behavior of LM26CIM5-BPB/NOPB?
The LM26CIM5-BPB/NOPB is factory-programmed for a −45°C undertemperature shutdown trip point. Its US output goes LOW when die temperature falls below −45°C and returns HIGH only after temperature rises above (−45°C + THYST). THYST is user-selectable: 2°C when HYST = V+, or 10°C when HYST = GND. This behavior is confirmed in the Device Comparison Table and Electrical Characteristics section of the SNIS115S datasheet.
Does LM26CIM5-BPB/NOPB support overtemperature or only undertemperature detection?
LM26CIM5-BPB/NOPB supports undertemperature detection only, with active-low open-drain US output. It does not provide OS (overtemperature shutdown) functionality. The Device Comparison Table explicitly lists LM26CIM5-BPB/NOPB under "US output" variants, and its top mark "TBPB" corresponds to −45°C undertemperature configuration. Other LM26 variants (e.g., LM26CIM5-NPA) offer OS functionality, but LM26CIM5-BPB/NOPB is fixed to US mode.
Can the VTEMP pin of LM26CIM5-BPB/NOPB be used for precise temperature measurement?
Yes, the VTEMP pin of LM26CIM5-BPB/NOPB provides a calibrated analog voltage described by VO = (−3.479×10⁻⁶×(T−30)²) + (−1.082×10⁻²×(T−30)) + 1.8015 V, with ±3°C total error across −30°C to +120°C. Its −10.82 mV/°C slope enables direct ADC conversion. However, VTEMP has weak drive capability (1 µA source / 40 µA sink), so external buffering or series resistance is required for capacitive loads >100 pF to prevent oscillation.
What is the recommended pullup resistor value for the US output of LM26CIM5-BPB/NOPB?
The US output of LM26CIM5-BPB/NOPB is open-drain and requires an external pullup resistor. Texas Instruments specifies ≥10 kΩ in the Pin Functions table. A 10 kΩ resistor is recommended for 3.3 V or 5 V logic interfaces, ensuring VOL ≤ 0.4 V at IOL = 3.2 mA. Higher values (e.g., 100 kΩ) reduce power consumption but increase susceptibility to noise; lower values increase drive strength but raise quiescent current. Layout should minimize trace capacitance to maintain fast edge rates.
Is LM26CIM5-BPB/NOPB RoHS-compliant and halogen-free?
Yes, LM26CIM5-BPB/NOPB is RoHS-compliant and halogen-free. The "/NOPB" suffix in the part number explicitly denotes lead-free (Pb-free) packaging per TI's standard nomenclature. Package information in the Mechanical, Packaging, and Orderable Information section confirms SOT-23 (DBV) as a green, RoHS-compliant package. Material content data is available in TI's official PPAP documentation and environmental compliance reports.
LM26CIM5-BPB/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Trip Temperature Threshold:
- Cold
- Switching Temperature:
- -45°C
- Accuracy:
- ±3°C
- Current - Output (Max):
- -
- Output Type:
- Open Drain
- Output:
- Active Low
- Output Function:
- /UnderTemp
- Selectable Hysteresis:
- Yes
- Features:
- -
- Voltage - Supply:
- 2.7 V ~ 5.5 V
- Current - Supply:
- 16µA
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-5
LM26CIM5-BPB/NOPB FAQ
1.How can I place an order for LM26CIM5-BPB/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26CIM5-BPB/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM26CIM5-BPB/NOPB reliable?
The price and inventory of LM26CIM5-BPB/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26CIM5-BPB/NOPB is usually 5 days.
3.What payment methods are accepted for LM26CIM5-BPB/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26CIM5-BPB/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26CIM5-BPB/NOPB?
LM26CIM5-BPB/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26CIM5-BPB/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM26CIM5-BPB/NOPB?
For technical support, including LM26CIM5-BPB/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26CIM5-BPB/NOPB requirements.
6.How does Aetrix verify that LM26CIM5-BPB/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26CIM5-BPB/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM26CIM5-BPB/NOPB meets industry standards.
7.What is the process for return or replacement of LM26CIM5-BPB/NOPB?
All LM26CIM5-BPB/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26CIM5-BPB/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM26CIM5-BPB/NOPB part is unused and in its original packaging.
Return procedure for LM26CIM5-BPB/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM26CIM5-BPB/NOPB Tags
-
N34TS04MT3ETG
onsemi
-
MCP9501PT-095E/OT
Microchip Technology
-
TMP390AQDRLRQ1
Texas Instruments
-
TC6501P125VCTTR
Microchip Technology
-
LM26CIM5-RPA/NOPB
Texas Instruments
-
MCP9509HT-E/OT
Microchip Technology
-
MCP9509CT-E/OT
Microchip Technology
-
MCP9510HT-E/CH
Microchip Technology
-
TC622VOA
Microchip Technology
-
TC620CEOA
Microchip Technology
-
TC622VAT
Microchip Technology
-
MAX6509HAUK+T
Analog Devices Inc./Maxim Integrated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
