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Silicon Labs TSM972CUA+
- Part No.:
- TSM972CUA+
- Manufacturer:
- Silicon Labs
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TSM972CUA+.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,948
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Product details
Overview
TSM972CUA+ from Silicon Labs is a dual, ultra-low-power, open-drain analog comparator with no internal reference, operating from single +2.5V to +11V or dual ±1.25V to ±5.5V supplies. It draws ≤4 μA (max) over temperature, features rail-to-rail input range down to V− and within 1.3 V of V+, and delivers 12 μs propagation delay at 10 mV overdrive - ideal for battery-powered threshold detection in portable instrumentation.
For engineers reviewing the TSM972CUA+ datasheet, TSM972CUA+ pinout, TSM972CUA+ application, or TSM972CUA+ equivalent, key selection criteria include micropower operation under varying supply conditions, open-drain output compatibility with wired-OR logic and level translation, and absence of integrated reference for flexible external reference sourcing.
Technical Context
The TSM972CUA+ implements two independent comparators with open-drain NMOS output stages sinking to V−, enabling direct wired-OR connection and bidirectional level shifting between voltage domains. Its input stage operates with common-mode range from V− to (V+ − 1.3 V), supporting single-supply use with ground-referenced signals or true dual-supply configurations.
No internal voltage reference is present - unlike TSM971/TSM973 - and no HYST pin is provided, eliminating on-chip hysteresis control. Propagation delay asymmetry is inherent: high-to-low transition is optimized at 12 μs (10 mV overdrive), while low-to-high requires ≥300 μs due to reliance on external pull-up RC time constant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +11V (single); ±1.25V to ±5.5V (dual) - supports direct integration into 3V/5V systems and legacy ±5V rails. |
| Quiescent Current | ≤4 μA (max) over −40°C to +85°C - enables multi-year operation on coin-cell batteries in always-on monitoring nodes. |
| Input Common-Mode Range | V− to (V+ − 1.3V) - accepts inputs down to negative rail, simplifying sensor interfacing without level-shifting circuitry. |
| Propagation Delay (High→Low) | 12 μs at 10 mV overdrive - ensures timely response in precision window detection and fast fault signaling. |
| Output Type | Open-drain, sinks to V− - allows shared bus operation, mixed-voltage logic interfacing, and configurable pull-up voltage selection. |
| Input Offset Voltage | ±10 mV - sets minimum detectable differential for DC-coupled thresholds; stable across temperature per characterization data. |
| Voltage Noise (100Hz–100kHz) | 20 μVRMS - limits false triggering in low-overdrive applications such as slow-moving sensor ramps. |
Pinout & Package
Package: 8-pin MSOP (TSM972CUA+) - 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad not electrically connected. Pin 1 marked by dot; pin 1–4 on left side, pin 5–8 on right side (viewed top-down).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Comparator A open-drain output; sinks current to V−; requires external pull-up for logic HIGH. |
| 2 | V− | Negative supply terminal; tied to GND in single-supply mode; defines output sink reference and input common-mode lower bound. |
| 3 | INA− | Inverting input for Comparator A; high-impedance node (±0.01 nA leakage); sensitive to PCB layout noise coupling. |
| 4 | INA+ | Noninverting input for Comparator A; identical electrical characteristics to INA−; supports differential or single-ended sensing. |
| 5 | INB+ | Noninverting input for Comparator B; electrically isolated from INA pins; enables independent dual-threshold monitoring. |
| 6 | INB− | Inverting input for Comparator B; matched offset and leakage to other inputs; supports mirrored or asymmetric thresholds. |
| 7 | V+ | Positive supply terminal; supplies bias current and output drive capability; decoupling recommended near pin. |
| 8 | OUTB | Comparator B open-drain output; sinks to V−; independently controllable; supports OR-ing with OUTA or separate loads. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent comparators | Enables simultaneous high/low threshold detection or redundant signal validation without external ICs. |
| Ultra-low quiescent current (≤4 μA) | Reduces average system power in wake-on-event architectures; extends battery life in IoT endpoint sensors. |
| Open-drain outputs sinking to V− | Permits level translation across domains (e.g., 5V logic controlling 3.3V microcontroller interrupt) and fault-bus wiring. |
| Rail-to-rail input common-mode range | Accepts inputs from V− up to V+ − 1.3V - eliminates need for input biasing resistors in single-supply sensor interfaces. |
| 12 μs high-to-low propagation delay | Supports sub-100 kHz event detection timing; sufficient for battery voltage monitoring, thermal cutoff, and supply sequencing. |
Applications
| Threshold Detector | Window Comparator |
|---|---|
|
Use Scenario: Monitoring Li-ion battery voltage to trigger undervoltage lockout before deep discharge. IC Role / Device Role / Timing Role: Dual comparator compares battery voltage against fixed upper/lower thresholds derived from external resistor dividers. Use Value: Prevents cell damage and runtime loss by enabling precise, low-power cutoff without MCU intervention. |
Use Scenario: Validating regulated 5V supply stays within ±5% tolerance during cold-start and load transients. IC Role / Device Role / Timing Role: One comparator detects overvoltage (OUTA active low), the other detects undervoltage (OUTB active low). Use Value: Generates clean "power-good" signal via wired-OR of both outputs - no additional logic gates required. |
| Level Translator | Battery-Powered System |
|
Use Scenario: Converting ±5V op-amp output signals to 3.3V-compatible digital inputs for an ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Comparator A compares signal against 0V reference; open-drain output pulled to 3.3V. Use Value: Achieves robust bipolar-to-unipolar conversion with <12 μs latency and zero static power overhead. |
Use Scenario: Enabling wake-on-motion in a wireless environmental sensor node powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Comparator monitors PIR sensor amplifier output; triggers MCU reset via open-drain interrupt line. Use Value: Draws only 4 μA continuously - contributes <0.035% of total system quiescent current, preserving >10-year shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX972ESA+ | Pin-compatible, same 8-pin SOIC/MSOP footprint and electrical specs; identical quiescent current and propagation delay. | No functional difference; designed as direct alternate source per manufacturer documentation. | Select when legacy MAXIM design reuse or dual-sourcing strategy requires identical form-fit-function replacement. |
| TLV3702IDR | Higher supply current (1.8 μA typical vs. 3.2 μA typ for TSM972); rail-to-rail input but output sinks to GND (not V−); no dual-supply support. | Limited to single-supply systems; lacks true dual-rail flexibility and V−-referenced output needed for ±5V interface. | Choose only for cost-sensitive, GND-referenced designs where dual-supply operation and V− sink are unnecessary. |
Compared with MAX972ESA+, TSM972CUA+ offers identical performance and drop-in compatibility; compared with TLV3702IDR, it provides essential dual-supply support and V−-sinking outputs critical for industrial signal conditioning - making it the preferred choice for mixed-rail and battery-backed applications.
Availability
TSM972CUA+ is available at Aetrix Electronics and suitable for battery-powered systems, precision threshold detectors, and industrial level translators requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across temperature.
Supply support for TSM972CUA+ 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, industrial, and consumer applications - with expertise in precision analog, timing, and energy-efficient design.
The TSM972CUA+ belongs to Silicon Labs' TSM97x micropower comparator family, engineered specifically for ultra-low-quiescent-current sensing in space- and power-constrained portable and remote systems.
FAQ
What is the maximum supply voltage rating for the TSM972CUA+?
The TSM972CUA+ has an absolute maximum supply voltage rating of +12V between V+ and V−, or +12V between V+ and GND in single-supply configuration. Operation beyond this risks permanent damage. The recommended operating range remains +2.5V to +11V for reliable performance across temperature, as validated in the Electrical Characteristics tables on pages 5–6 of the official datasheet.
Does the TSM972CUA+ include an internal voltage reference?
No, the TSM972CUA+ does not include an internal voltage reference. Unlike TSM971/TSM973/TSM982 variants, it omits both the REF and HYST pins. Reference voltages must be supplied externally - enabling design flexibility for custom thresholds or higher-accuracy references - and confirmed explicitly in the "PART" summary table on page 1 and the "PIN FUNCTIONS" table on page 10.
Can the TSM972CUA+ operate from dual ±5V supplies?
Yes, the TSM972CUA+ supports dual-supply operation from ±1.25V to ±5.5V. When configured with V+ = +5V and V− = −5V, its input common-mode range extends from −5V to +3.7V, and outputs sink to V− (−5V), enabling direct interfacing with bipolar analog circuits. This capability is specified in the "Single or Dual Power Supplies" feature list and verified in Absolute Maximum Ratings on page 2.
What is the purpose of the open-drain outputs in the TSM972CUA+?
The open-drain outputs in the TSM972CUA+ allow wired-OR logic implementation, level translation across different voltage domains, and flexible pull-up configuration. Each output (OUTA/OUTB) sinks current to V−, not GND - a key distinction that supports true dual-supply operation. This architecture eliminates contention in shared-bus configurations and is explicitly cited in the "DESCRIPTION" section on page 1 and "Comparator Output" subsection on page 12.
How does hysteresis work with the TSM972CUA+?
The TSM972CUA+ does not provide on-chip hysteresis or a HYST pin. Hysteresis must be added externally using positive feedback - typically via resistors from output to noninverting input - as illustrated in Figure 3 on page 13. This method increases design complexity and slows response versus HYST-capable variants like TSM973, but preserves full independence between the two comparators and avoids reference loading.
TSM972CUA+ 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:
- General Purpose
- Number of Elements:
- 2
- 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
TSM972CUA+ FAQ
1.How can I place an order for TSM972CUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM972CUA+ 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 TSM972CUA+ reliable?
The price and inventory of TSM972CUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM972CUA+ is usually 5 days.
3.What payment methods are accepted for TSM972CUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM972CUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM972CUA+?
TSM972CUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM972CUA+ 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 TSM972CUA+?
For technical support, including TSM972CUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM972CUA+ requirements.
6.How does Aetrix verify that TSM972CUA+ is sourced from the original manufacturer or authorized distributors?
All TSM972CUA+ 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 TSM972CUA+ meets industry standards.
7.What is the process for return or replacement of TSM972CUA+?
All TSM972CUA+ units undergo pre-shipment inspection (PSI). If there is an issue with TSM972CUA+, 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 TSM972CUA+ part is unused and in its original packaging.
Return procedure for TSM972CUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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