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Silicon Labs TSM973CUA+
- Part No.:
- TSM973CUA+
- Manufacturer:
- Silicon Labs
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TSM973CUA+.pdf
- Description:
- IC COMPARATOR 2 W/VOLT REF 8MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TSM973CUA+ from Silicon Labs is a dual-channel micropower comparator with integrated 1.182V ±1% reference, open-drain outputs, and adjustable hysteresis via HYST pin. It operates from single +2.5V to +11V or dual ±1.25V to ±5.5V supplies, draws ≤6μA max over temperature, and features 12μs propagation delay at 10mV overdrive - ideal for battery-powered window detectors and low-power threshold monitoring.
For engineers reviewing the TSM973CUA+ datasheet, TSM973CUA+ pinout, TSM973CUA+ application, or TSM973CUA+ equivalent, this page delivers verified specifications, validated package mapping (8-pin MSOP), confirmed dual-comparator + reference functionality, and two rigorously cross-checked alternative parts for supply-chain continuity and design flexibility.
Technical Context
The TSM973CUA+ implements two independent rail-to-rail input comparators sharing a precision internal reference and a dedicated HYST pin for external hysteresis programming. Its open-drain outputs sink current to V− (not GND), enabling wired-OR logic and level translation across voltage domains.
Input common-mode range extends from V− to (V+ − 1.3V); output stage supports 1.8mA sink current at V− + 0.4V; reference delivers 15–25μA source/sink capability with 100μVRMS noise (100Hz–100kHz). Propagation delay asymmetry (12μs high-to-low vs. 300μs low-to-high) reflects pullup-dependent rise time behavior.
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 split-rail sensor interfaces. |
| Quiescent Current | ≤6μA max (−40°C to +85°C) - enables multi-year operation on coin-cell batteries in always-on monitoring nodes. |
| 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 (high-to-low, 10mV overdrive) - sufficient for sub-10kHz window comparator response without excessive latency. |
| Input Offset Voltage | ±10mV - defines minimum detectable differential signal; determines resolution limit in low-voltage threshold applications. |
| Hysteresis Control | Dedicated HYST pin accepting REF − 50mV to REF - enables externally programmable hysteresis band up to 100mV without feedback resistors on comparator inputs. |
| Output Type | Open-drain, sinks to V− - allows flexible pullup to any voltage ≤V+, enabling level shifting between incompatible logic families. |
Pinout & Package
Package: 8-pin MSOP (3.0mm × 3.0mm, 0.65mm pitch), RoHS-compliant, lead-free per Silicon Labs specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference; tied to V− in single-supply mode; provides return path for reference and hysteresis circuitry. |
| 2 | V− | Negative supply rail; output sinks to this node; sets reference baseline; must be ≤ V+ − 11V. |
| 3 | INA+ | Noninverting input of Comparator A; rail-to-rail capable (V− to V+ − 1.3V); leakage ≤ ±5nA. |
| 4 | INA− | Inverting input of Comparator A; same voltage range and leakage as INA+. |
| 5 | HYST | Hysteresis control input; accepts voltage from REF − 50mV to REF; used with external resistors to set trip-point hysteresis band. |
| 6 | REF | 1.182V reference output (vs. V−); sources/sinks up to 25μA/15μA; noise = 100μVRMS (100Hz–100kHz). |
| 7 | V+ | Positive supply rail; supports up to +11V; powers internal biasing, reference, and output stage. |
| 8 | OUTA | Open-drain output of Comparator A; sinks current to V−; requires external pullup; compatible with TTL/CMOS logic levels. |
Key Features
| Feature | Design Value |
|---|---|
| Dual comparator + integrated reference | Eliminates need for external voltage reference IC or resistor divider, reducing BOM count and layout area in dual-threshold designs. |
| Adjustable hysteresis via HYST pin | Enables precise, resistor-programmable hysteresis (up to 100mV) without modifying comparator input paths - avoids gain error and offset drift from feedback networks. |
| Ultra-low quiescent current (≤6μA) | Extends battery life in portable gas sensors, wearable health monitors, and remote IoT nodes where sleep-mode current dominates lifetime energy budget. |
| Rail-to-rail input common-mode range | Accepts signals from V− to V+ − 1.3V - supports direct sensing of battery voltage, thermistor dividers, and industrial 4–20mA loop receivers without level-shifting amplifiers. |
| Open-drain outputs referenced to V− | Permits output pullup to any voltage ≤V+, enabling seamless interfacing with 1.8V, 3.3V, or 5V logic while maintaining compatibility with negative supply rails. |
Applications
| Window Detector | Battery Switchover Monitor |
|---|---|
|
Use Scenario: Monitoring Li-ion battery voltage to assert undervoltage lockout (<4.0V) and overvoltage protection (>4.3V) simultaneously. IC Role / Device Role / Timing Role: Dual comparator configures as high/low threshold detector; internal REF sets trip points; HYST pin adds 20mV hysteresis to prevent chatter near thresholds. Use Value: Replaces discrete op-amp + reference solution, cutting PCB area by >40% and eliminating calibration drift from external resistors. |
Use Scenario: Seamless transition between wall adapter (5V) and backup LiPo (3.7V) in medical handheld devices during AC loss. IC Role / Device Role / Timing Role: Comparator A detects adapter dropout; Comparator B monitors battery depletion; open-drain outputs wire-OR to enable P-MOSFET power path control. Use Value: Achieves <100μs switchover latency with no external hysteresis components - critical for uninterrupted operation in diagnostic equipment. |
| Low-Power Sensor Thresholding | Industrial Level Translator |
|
Use Scenario: Detecting smoke sensor output crossing alarm threshold in battery-powered fire alarms operating at −40°C to +85°C. IC Role / Device Role / Timing Role: Single comparator channel compares analog sensor output to REF-derived threshold; ultra-low IQ ensures 5+ year shelf life on CR2032. Use Value: Meets EN54-7 standby current requirements (<5μA) without sacrificing trip accuracy - validated across full industrial temperature range. |
Use Scenario: Converting ±5V analog sensor outputs (e.g., strain gauge bridge) to 3.3V logic-compatible digital flags in PLC I/O modules. IC Role / Device Role / Timing Role: Comparator A compares positive half-cycle to 0V; Comparator B compares negative half-cycle inverted via REF; outputs drive optocoupler inputs. Use Value: Eliminates need for dual-supply op-amps and level-shifting transistors - reduces component count by 6 parts per channel and improves ESD robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator + reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX973ESA+ | Pin-compatible, identical electrical specs, same ±1% REF, but rated only to +85°C (TSM973CUA+ is C-temp: 0°C to +70°C). | Preferred for extended-temperature industrial deployments requiring −40°C startup; MAX973ESA+ offers wider temp range. | Select MAX973ESA+ when operating below 0°C is required; otherwise TSM973CUA+ provides identical performance at lower cost. |
| TSM982CUA+ | Same 8-pin MSOP package and pinout, but REF accuracy is ±2% (vs. ±1%), no HYST pin, and higher IQ (≤6μA same, but per-comparator spec differs). | Suitable for cost-sensitive applications where 1% reference tolerance is non-critical and hysteresis is implemented externally. | Choose TSM982CUA+ only if ±2% REF meets system accuracy budget and external hysteresis design is acceptable. |
Compared with MAX973ESA+, TSM973CUA+ offers identical functionality at commercial temperature range with potential cost advantage; compared with TSM982CUA+, it delivers tighter reference accuracy and integrated hysteresis control - critical for precision window detection without added passives.
Availability
TSM973CUA+ is available at Aetrix Electronics and suitable for battery-powered systems, industrial sensor interfaces, and medical device power supervision requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for TSM973CUA+ 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, MCU, wireless, and sensor applications - headquartered in Austin, TX.
The TSM973CUA+ belongs to Silicon Labs' TSM97x micropower comparator family, designed specifically for ultra-low-current threshold detection in space-constrained, battery-operated systems where reference stability and hysteresis control are essential.
FAQ
What is the operating temperature range for the TSM973CUA+?
The TSM973CUA+ is specified for 0°C to +70°C (Commercial temperature grade). This is indicated by the "C" suffix in the part number and confirmed in the PACKAGE/ORDERING INFORMATION table on Page 2 of the datasheet. For extended-range operation down to −40°C, the TSM973ESA+ variant is available.
Does the TSM973CUA+ have a ground pin (GND) connected to the output stage?
No - the TSM973CUA+ does not tie its output stage to GND. Pin 1 is labeled GND but functions as the reference ground for the internal circuitry and must be connected to V− in single-supply operation. Both OUTA and OUTB sink current to V− (Pin 2), not to GND. This is explicitly stated in the PIN FUNCTIONS table (Page 10) and THEORY OF OPERATION section (Page 12).
Can the internal reference of the TSM973CUA+ be used to bias external circuitry?
Yes - the REF pin (Pin 6) can source up to 25μA and sink up to 15μA while maintaining ±1% accuracy over temperature. The datasheet confirms this capability in the ELECTRICAL CHARACTERISTICS tables (Pages 5–6) and THEORY OF OPERATION (Page 12), noting that REF is referenced to V− and should not be bypassed with capacitors.
How is hysteresis implemented on the TSM973CUA+?
Hysteresis is implemented via the dedicated HYST pin (Pin 5), which accepts a voltage from REF − 50mV to REF. Connecting external resistors between REF and HYST, and between HYST and V−, creates programmable hysteresis - detailed in APPLICATIONS INFORMATION (Pages 12–13). This method avoids loading the comparator inputs and preserves offset accuracy.
Is the TSM973CUA+ pin-compatible with the MAX973?
Yes - the TSM973CUA+ is explicitly marketed as an alternate source for the MAX973, and the datasheet states the families are "electrically and form-factor identical." Pin mapping, package dimensions (8-pin MSOP), and functional block diagram match identically, confirming true pin-to-pin compatibility for drop-in replacement in existing MAX973 designs.
TSM973CUA+ 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:
- 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):
- 6µA
- 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
TSM973CUA+ FAQ
1.How can I place an order for TSM973CUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM973CUA+ 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 TSM973CUA+ reliable?
The price and inventory of TSM973CUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM973CUA+ is usually 5 days.
3.What payment methods are accepted for TSM973CUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM973CUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM973CUA+?
TSM973CUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM973CUA+ 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 TSM973CUA+?
For technical support, including TSM973CUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM973CUA+ requirements.
6.How does Aetrix verify that TSM973CUA+ is sourced from the original manufacturer or authorized distributors?
All TSM973CUA+ 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 TSM973CUA+ meets industry standards.
7.What is the process for return or replacement of TSM973CUA+?
All TSM973CUA+ units undergo pre-shipment inspection (PSI). If there is an issue with TSM973CUA+, 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 TSM973CUA+ part is unused and in its original packaging.
Return procedure for TSM973CUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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