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Silicon Labs TSM971CUA+
- Part No.:
- TSM971CUA+
- Manufacturer:
- Silicon Labs
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TSM971CUA+.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,973
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Product details
Overview
TSM971CUA+ from Silicon Labs is a single-channel, micropower analog comparator with integrated 1.182V ±1% reference, open-drain output, and adjustable hysteresis via HYST pin. 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 TSM971CUA+ datasheet, TSM971CUA+ pinout, TSM971CUA+ application, or TSM971CUA+ equivalent, key selection criteria include ultra-low quiescent current across temperature, internal reference accuracy and sourcing capability (±1%, 25μA source), open-drain output compatibility with wired-OR logic, and validated hysteresis programmability using two external resistors.
Technical Context
The TSM971CUA+ implements a rail-to-rail input stage with common-mode range extending from V− to (V+ − 1.3V), enabling direct sensing near ground in single-supply systems. Its open-drain output sinks to GND (not V−), enabled by a dedicated GND pin separate from V− - a structural distinction from TSM972/TSM973 variants.
Internal 1.182V reference is buffered and referenced to V−, with ±1% initial accuracy over 0°C to +70°C and ±2% over −40°C to +85°C. Hysteresis is implemented via the HYST pin, accepting voltages from REF down to REF − 50mV, allowing precise 50–100mV hysteresis bands without feedback resistors across the comparator inputs.
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 integration into 3V/5V systems and legacy ±5V rails. |
| Max Supply Current | 4μA over −40°C to +85°C - enables multi-year operation on coin-cell batteries in always-on monitoring circuits. |
| Reference Voltage | 1.182V ±1% (0°C to +70°C); ±2% (−40°C to +85°C) - stable trip-point anchor for precision undervoltage/overvoltage detection. |
| Propagation Delay | 12μs at 10mV overdrive - ensures timely response in low-speed control loops and power-good sequencing. |
| Input Common-Mode Range | V− to (V+ − 1.3V) - allows direct connection of IN+ or IN− to ground or near-rail signals without level shifting. |
| Output Type | Open-drain sinking to GND - enables wired-OR combining, I²C-compatible level translation, and flexible pull-up voltage selection. |
| Hysteresis Control | Dedicated HYST pin (REF to REF − 50mV) - permits externally programmable hysteresis up to 100mV without modifying signal path resistors. |
Pinout & Package
Package: 8-pin MSOP (TSM971CUA+) per JEDEC MO-187AA, 3.0mm × 3.0mm body, 0.65mm pitch. Pin 1 marked with dot; pin 1 is top-left when notch or dot faces upward.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for output stage; must connect to system GND (not V−) in single-supply mode to enable GND-referenced sinking. |
| 2 | V− | Negative supply terminal; tied to GND for single supply; used as return for reference and comparator bias in dual-supply operation. |
| 3 | IN+ | Noninverting input; accepts voltages from V− to (V+ − 1.3V); high-impedance (±0.01nA leakage) for minimal loading. |
| 4 | IN− | Inverting input; identical electrical specs to IN+; supports differential or single-ended configurations with rail-to-rail common-mode range. |
| 5 | HYST | Hysteresis control input; voltage between REF and (REF − 50mV) sets hysteresis band; no external feedback required. |
| 6 | REF | 1.182V reference output referenced to V−; sources up to 25μA; requires no bypass capacitor but must not be shorted. |
| 7 | V+ | Positive supply input; supports up to +11V; supplies internal bias, reference, and output driver circuitry. |
| 8 | OUT | Open-drain comparator output; sinks current to GND (pin 1); requires external pull-up; compatible with TTL/CMOS logic levels. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | ≤4μA max over full temperature range - extends battery life in IoT sensors and wearables beyond 5 years on CR2032. |
| Integrated precision reference | 1.182V ±1% (0°C to +70°C), 100μVRMS noise - eliminates external reference IC and reduces BOM count in voltage-monitoring designs. |
| Programmable hysteresis | 50–100mV band via HYST pin - prevents chatter during slow-moving thresholds without adding op-amps or complex feedback networks. |
| GND-referenced open-drain output | Sinks to pin 1 (GND), not V− - simplifies level translation between domains and enables direct interfacing with 1.8V/3.3V/5V logic families. |
| Rail-to-rail input capability | Common-mode range from V− to (V+ − 1.3V) - supports direct connection of sensor outputs or battery terminals without attenuation or clamping. |
Applications
| Threshold Detector | Window Comparator |
|---|---|
|
Use Scenario: Monitoring Li-ion battery voltage to trigger charge termination at 4.2V and low-voltage cutoff at 3.0V. IC Role / Device Role / Timing Role: Single comparator (TSM971CUA+) compares battery voltage against reference-derived thresholds; HYST pin configures 50mV hysteresis to prevent oscillation near trip points. Use Value: Eliminates need for external reference and hysteresis resistors, reducing solution size by 30% and component count by 4 versus discrete solutions. |
Use Scenario: Validating regulated 5V supply stays within 4.75V–5.25V tolerance window in industrial PLC modules. IC Role / Device Role / Timing Role: TSM971CUA+ used in dual-threshold configuration with resistor divider and HYST pin; OUT drives power-good LED via pull-up. Use Value: Achieves ±1% trip accuracy over temperature using internal reference, avoiding drift-induced false trips in mission-critical power supervision. |
| Oscillator Circuit | Battery-Powered System |
|
Use Scenario: Building relaxation oscillator for low-power LED blinker in remote sensor node. IC Role / Device Role / Timing Role: TSM971CUA+ functions as Schmitt trigger with RC network on IN+ and HYST pin; REF provides stable hysteresis center. Use Value: Enables oscillator frequency stability <±2% over temperature using only 3 passive components - no timing capacitor drift compensation needed. |
Use Scenario: Undervoltage lockout (UVLO) for BLE microcontroller powered by alkaline AA cells. IC Role / Device Role / Timing Role: TSM971CUA+ monitors battery stack voltage; triggers reset when falling below 2.2V with 100mV hysteresis to avoid brownout cycling. Use Value: Draws only 3.2μA typical at 3V, contributing <0.1% of total system standby current - critical for >10-year shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX971ESA+ | Pin-compatible alternate; same 1.182V ±1% reference, 4μA max current, and HYST pin functionality; identical 8-pin SOIC/MSOP footprint. | Identical functional scope; qualified for extended temperature (−40°C to +85°C) but lacks TSM971CUA+'s lead-free-only packaging compliance per Silicon Labs program. | Select MAX971ESA+ only if legacy MAX-family qualification or second-source assurance is required; otherwise TSM971CUA+ offers newer manufacturing and RoHS alignment. |
| TSM971CSA+ | Same die, different package: 8-pin SOIC (vs MSOP); wider body (4.9mm vs 3.0mm); higher thermal resistance (471mW vs 330mW at +70°C). | Preferred for through-hole prototyping or high-reliability industrial PCBs where MSOP reflow yield is a concern; same electrical performance and pinout. | Choose TSM971CSA+ for manual assembly, wave soldering, or thermal margin headroom; TSM971CUA+ is optimal for space-constrained, high-density SMT layouts. |
Compared with MAX971ESA+, TSM971CUA+ provides identical comparator functionality with updated environmental compliance and tighter manufacturing controls; compared with TSM971CSA+, it delivers 33% smaller footprint and improved thermal performance in compact battery-powered enclosures.
Availability
TSM971CUA+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, and industrial power supervision requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for TSM971CUA+ 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 IoT, timing, and connectivity applications, headquartered in Austin, TX.
The TSM971CUA+ belongs to Silicon Labs' TSM97x micropower comparator family, designed specifically for energy-constrained systems needing precision voltage monitoring without sacrificing accuracy or flexibility across wide temperature and supply ranges.
FAQ
What is the operating temperature range for the TSM971CUA+?
The TSM971CUA+ is specified for 0°C to +70°C ambient operation (Commercial grade). Its internal reference maintains ±1% accuracy across this range, and supply current remains ≤4μA maximum. For extended temperature applications (−40°C to +85°C), the TSM971ESA+ variant is recommended - the TSM971CUA+ is not characterized or guaranteed outside its rated range.
Can the TSM971CUA+ operate from a 1.8V supply?
No, the TSM971CUA+ requires a minimum supply voltage of +2.5V per datasheet specifications. Below this, comparator propagation delay increases significantly and reference regulation fails. The TSM984 is the only device in the family rated for operation down to 1.5V - the TSM971CUA+ must be used within its +2.5V to +11V single-supply range.
How is hysteresis configured on the TSM971CUA+?
Hysteresis on the TSM971CUA+ is configured using the HYST pin (Pin 5), which accepts a voltage between REF (Pin 6) and REF − 50mV. A resistor divider from REF to GND sets this voltage; the resulting hysteresis band equals twice the voltage difference between REF and HYST. No feedback across the comparator inputs is required - the TSM971CUA+ implements hysteresis internally based on HYST pin voltage.
Does the TSM971CUA+ require an external bypass capacitor?
No external bypass capacitor is required for stable operation of the TSM971CUA+. The device's ultra-low current design and internal regulation make it insensitive to typical supply noise. However, a 0.1μF ceramic capacitor placed close to the V+ and GND pins is recommended if the PCB has long power traces, high-impedance supplies, or co-located noisy digital circuitry - this improves noise immunity without affecting TSM971CUA+ functionality.
What is the purpose of the separate GND and V− pins on the TSM971CUA+?
The TSM971CUA+ uses separate GND (Pin 1) and V− (Pin 2) pins to enable true GND-referenced output sinking while maintaining independent negative supply biasing. In single-supply operation, GND is connected to system ground and V− is tied to GND; in dual-supply mode, V− connects to the negative rail while GND remains at 0V - allowing the open-drain output to sink cleanly to 0V regardless of V− potential, unlike TSM972/TSM973 variants.
TSM971CUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- TSM97x
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-MSOP
TSM971CUA+ FAQ
1.How can I place an order for TSM971CUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM971CUA+ 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 TSM971CUA+ reliable?
The price and inventory of TSM971CUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM971CUA+ is usually 5 days.
3.What payment methods are accepted for TSM971CUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM971CUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM971CUA+?
TSM971CUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM971CUA+ 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 TSM971CUA+?
For technical support, including TSM971CUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM971CUA+ requirements.
6.How does Aetrix verify that TSM971CUA+ is sourced from the original manufacturer or authorized distributors?
All TSM971CUA+ 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 TSM971CUA+ meets industry standards.
7.What is the process for return or replacement of TSM971CUA+?
All TSM971CUA+ units undergo pre-shipment inspection (PSI). If there is an issue with TSM971CUA+, 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 TSM971CUA+ part is unused and in its original packaging.
Return procedure for TSM971CUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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