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Silicon Labs TSM971ESA+T
- Part No.:
- TSM971ESA+T
- Manufacturer:
- Silicon Labs
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TSM971ESA+T.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,077
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Product details
Overview
TSM971ESA+T from Silicon Labs is an ultra-low-power, single-channel analog comparator with integrated 1.182V ±1% reference, open-drain output, and adjustable hysteresis. It operates from +2.5V to +11V single supply or ±1.25V to ±5.5V dual supply, draws ≤4μA max supply current over temperature, and delivers 12μs propagation delay at 10mV overdrive - ideal for battery-powered threshold detection in portable instrumentation.
For engineers reviewing the TSM971ESA+T datasheet, TSM971ESA+T pinout, TSM971ESA+T application, or TSM971ESA+T equivalent, key selection considerations include its GND-referenced open-drain output, internal reference accuracy over –40°C to +85°C, hysteresis programmability via HYST pin, and compatibility with MAX971 as alternate source.
Technical Context
The TSM971ESA+T implements a micropower rail-to-rail input comparator core with input common-mode range extending from V– to (V+ – 1.3V), enabling operation near ground in single-supply systems. Its open-drain output sinks to GND (not V–), and includes a dedicated GND pin for flexible single/dual-supply configuration.
It integrates a precision 1.182V reference referenced to V–, specified at ±1% over 0°C to +70°C and ±2% over –40°C to +85°C, with ±25μA sourcing/sinking capability. Hysteresis is added externally via the HYST pin (REF to REF–50mV range), supporting stable threshold detection without external op-amps or feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +11V (single) or ±1.25V to ±5.5V (dual) - supports direct 3.3V/5V logic interfacing and wide industrial input rails |
| Quiescent Current | ≤4μA max over –40°C to +85°C - enables multi-year operation on coin-cell batteries |
| Reference Voltage | 1.182V ±2% over –40°C to +85°C - provides stable trip-point generation without external voltage dividers |
| Propagation Delay | 12μs at 10mV overdrive - ensures timely response in low-speed monitoring (e.g., battery undervoltage lockout) |
| Input Common-Mode Range | V– to (V+ – 1.3V) - allows direct sensing of signals down to ground in single-supply configurations |
| Output Type | Open-drain sinking to GND - enables wired-OR logic, level translation, and pull-up to higher-voltage rails |
| Hysteresis Support | Adjustable via HYST pin (REF to REF–50mV) - eliminates oscillation near thresholds using only two resistors |
Pinout & Package
Package: 8-pin SOIC (Small Outline Integrated Circuit), JEDEC MS-012 compliant, body dimensions 4.80–5.00 mm × 3.73–3.89 mm, 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for output stage; tied to V– in single-supply mode; enables GND-referenced sinking |
| 2 | V– | Negative supply input; connected to GND for single supply; supports dual-supply operation down to ±1.25V |
| 3 | IN+ | Noninverting input; accepts voltages from V– to (V+ – 1.3V); high-impedance (±0.01nA leakage) |
| 4 | IN– | Inverting input; same voltage range and leakage as IN+ |
| 5 | HYST | Hysteresis control input; accepts REF to (REF – 50mV); sets hysteresis band up to 100mV |
| 6 | REF | 1.182V reference output referenced to V–; sources/sinks ±25μA; must not be bypassed |
| 7 | V+ | Positive supply input; supports up to +11V; powers comparator core and reference |
| 8 | OUT | Open-drain output; sinks current to GND (not V–); requires external pull-up for logic-level output |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | ≤4μA max over full –40°C to +85°C range - extends battery life in always-on sensors |
| Integrated precision reference | 1.182V ±2% over –40°C to +85°C - eliminates need for external reference IC or resistor divider calibration |
| Programmable hysteresis | Configurable 0–100mV hysteresis band via HYST pin - prevents chatter without complex feedback circuits |
| GND-referenced open-drain output | Sinks to GND (not V–) - simplifies level-shifting to 3.3V/5V logic and enables wired-OR alarm aggregation |
| Rail-to-rail input capability | Common-mode range from V– to (V+ – 1.3V) - supports direct ground-sensed inputs in 3V systems |
Applications
| Threshold Detector | Window Comparator |
|---|---|
Use Scenario: Monitoring lithium-ion battery voltage to trigger undervoltage shutdown at 3.0V. IC Role / Device Role / Timing Role: Single comparator compares battery voltage against 1.182V reference scaled by resistor divider; HYST pin adds 20mV hysteresis. Use Value: Eliminates external reference and reduces BOM count by one IC while maintaining ±2% trip accuracy over temperature. | Use Scenario: Validating 5V power rail stays within 4.75V–5.25V tolerance in embedded controller. IC Role / Device Role / Timing Role: Two TSM971ESA+T units (one for low threshold, one for high) feed outputs to wired-OR gate generating POWER_GOOD signal. Use Value: Uses internal references and open-drain outputs to implement window detection with no additional active components. |
| Oscillator Circuit | Battery-Powered System |
Use Scenario: Building relaxation oscillator for LED blink timing in low-power IoT node. IC Role / Device Role / Timing Role: TSM971ESA+T compares capacitor voltage (charged via resistor) against fixed 1.182V reference; output toggles charge/discharge path. Use Value: Leverages ultra-low 4μA supply current and precise reference to achieve >10-year oscillator runtime on CR2032. | Use Scenario: Enabling wake-on-event functionality in handheld medical sensor with coin-cell battery. IC Role / Device Role / Timing Role: TSM971ESA+T monitors physiological signal amplitude; triggers MCU wake when crossing programmable threshold. Use Value: Draws <4μA continuously while providing reliable edge detection - avoids power-hungry ADC polling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX971ESA+ | Pin-compatible, identical electrical specs per Maxim datasheet; same 8-pin SOIC package and –40°C to +85°C rating | No internal hysteresis control pin; requires external resistor network for hysteresis implementation | Select MAX971ESA+ only if legacy design validation or second-source qualification is required |
| TSM971CSA+T | Same die and functionality, but rated for 0°C to +70°C industrial range instead of –40°C to +85°C | Not suitable for extended-temperature environments such as automotive cabin or outdoor industrial enclosures | Choose TSM971CSA+T for cost-sensitive commercial applications where ambient temperature remains within 0–70°C |
Compared with MAX971ESA+, TSM971ESA+T offers integrated hysteresis control and identical performance; compared with TSM971CSA+T, it provides guaranteed operation down to –40°C - critical for cold-weather deployment and industrial reliability.
Availability
TSM971ESA+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, and industrial sensor nodes requiring stable component supply across extended temperature ranges.
Supply support for TSM971ESA+T 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
Silicon Labs is a fabless semiconductor company specializing in low-power, mixed-signal ICs for timing, connectivity, and sensing applications.
The TSM971ESA+T belongs to Silicon Labs' TSM97x micropower comparator family, designed specifically for energy-constrained systems needing precision threshold detection without sacrificing supply current efficiency.
FAQ
What is the operating temperature range of the TSM971ESA+T?
The TSM971ESA+T is specified for operation from –40°C to +85°C. This extended industrial temperature range is confirmed in the "PACKAGE/ORDERING INFORMATION" table on Page 2 of the datasheet, where "TSM971ESA+" and "TSM971ESA+T" are explicitly listed under the "E" grade (–40°C to +85°C). The internal 1.182V reference maintains ±2% accuracy across this full range.
Does the TSM971ESA+T have a built-in voltage reference?
Yes, the TSM971ESA+T integrates a precision 1.182V voltage reference referenced to V–. As stated on Page 1 ("FEATURES") and confirmed in the "INTERNAL REFERENCE" table, the TSM971 provides a ±1% reference over 0°C to +70°C and ±2% over –40°C to +85°C. The REF pin (Pin 6) sources up to 25μA and sinks up to 15μA, and must not be bypassed per the "Voltage Reference" section on Page 12.
How is hysteresis implemented on the TSM971ESA+T?
Hysteresis on the TSM971ESA+T is implemented via the HYST pin (Pin 5), which accepts a voltage from REF down to (REF – 50mV). As detailed in the "Hysteresis (TSM971/973 and TSM982)" section on Page 13, connecting two resistors between REF, HYST, and V– creates programmable hysteresis - e.g., 50mV at HYST yields a 100mV hysteresis band. No external op-amp or feedback loop is required.
What is the function of the GND pin (Pin 1) on the TSM971ESA+T?
Pin 1 (GND) on the TSM971ESA+T serves as the output stage's ground reference. As clarified in the "PIN FUNCTIONS" table (Page 10) and "THEORY OF OPERATION" (Page 12), the OUT pin (Pin 8) sinks current to GND - not to V–. In single-supply operation, GND must be tied to V–; in dual-supply mode, GND remains at 0V while V– goes negative, enabling true bipolar output swing relative to system ground.
Can the TSM971ESA+T operate from a 3V supply?
Yes, the TSM971ESA+T fully supports 3V single-supply operation. The "ELECTRICAL CHARACTERISTICS – 3V OPERATION" table on Page 6 confirms supply current ≤3.8μA max, input offset voltage ±10mV, and propagation delay 12μs at 10mV overdrive under V+ = 3V, V– = GND conditions. The input common-mode range extends from GND to 1.7V, accommodating typical 3V sensor outputs.
TSM971ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- TSM97x
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- with Voltage Reference
- Number of Elements:
- 1
- Output Type:
- Open-Drain
- Voltage - Supply, Single/Dual (±):
- 2.5V ~ 11V, ±1.25V ~ 5.5V
- :
- 10mV @ 2.5V
- Voltage - Input Offset (Max):
- 0.005µA @ 2.5V
- Current - Input Bias (Max):
- 40mA
- Current - Output (Typ):
- 4µA
- Current - Quiescent (Max):
- 67dB CMRR, 67dB PSRR
- CMRR, PSRR (Typ):
- 12µs
- Propagation Delay (Max):
- 50mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
TSM971ESA+T FAQ
1.How can I place an order for TSM971ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM971ESA+T 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 TSM971ESA+T reliable?
The price and inventory of TSM971ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM971ESA+T is usually 5 days.
3.What payment methods are accepted for TSM971ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM971ESA+T transactions.
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4.How is shipping managed for TSM971ESA+T?
TSM971ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM971ESA+T 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 TSM971ESA+T?
For technical support, including TSM971ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM971ESA+T requirements.
6.How does Aetrix verify that TSM971ESA+T is sourced from the original manufacturer or authorized distributors?
All TSM971ESA+T 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 TSM971ESA+T meets industry standards.
7.What is the process for return or replacement of TSM971ESA+T?
All TSM971ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with TSM971ESA+T, 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 TSM971ESA+T part is unused and in its original packaging.
Return procedure for TSM971ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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