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Silicon Labs TSM973CSA+
- Part No.:
- TSM973CSA+
- Manufacturer:
- Silicon Labs
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TSM973CSA+.pdf
- Description:
- IC COMPARATOR 2 W/VOLT REF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,132
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Product details
Overview
TSM973CSA+ 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 delivers 12μs propagation delay at 10mV overdrive - ideal for battery-powered window detectors and low-power threshold monitoring.
For engineers reviewing the TSM973CSA+ datasheet, TSM973CSA+ pinout, TSM973CSA+ application, or TSM973CSA+ equivalent, key selection criteria include its dual-comparator + reference integration, ultra-low quiescent current across temperature, open-drain wired-OR capability, ±1% reference accuracy over 0°C to +70°C, and compatibility with MAX973 as an alternate source.
Technical Context
The TSM973CSA+ implements two independent rail-to-rail input comparators sharing a common internal 1.182V reference referenced to V−. Its HYST pin enables externally programmable hysteresis using two resistors, supporting stable threshold detection without oscillation in noisy environments.
Input common-mode range extends from V− to (V+ − 1.3V), enabling operation near ground in single-supply systems. Open-drain outputs sink current to V− (not GND), requiring external pull-up resistors - a design choice that supports level translation and wired-OR logic while maintaining compatibility with TTL/CMOS loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +11V (single) or ±1.25V to ±5.5V (dual) - supports wide input flexibility in portable and industrial rails |
| Max Supply Current | 6μA over temperature - enables multi-year battery life in always-on sensing nodes |
| Reference Voltage | 1.182V ±1% (0°C to +70°C) - provides stable, factory-trimmed threshold for precision voltage monitoring |
| Propagation Delay | 12μs at 10mV overdrive - ensures timely response in fast-acting protection circuits |
| Input Offset Voltage | ±10mV - defines minimum detectable differential voltage without external trimming |
| Output Type | Open-drain sinking to V− - allows flexible pull-up voltage selection and wired-OR bus configuration |
| Input Common-Mode Range | V− to (V+ − 1.3V) - supports detection of signals near negative rail, critical for low-side current sensing |
Pinout & Package
Package: 8-pin SOIC (Small Outline Integrated Circuit), JEDEC MS-012 compliant, 3.9mm × 4.9mm body, 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference; tied to V− in single-supply mode to establish output sink path |
| 2 | V− | Negative supply rail; sets reference for REF and output sink node |
| 3 | IN+ | Comparator A noninverting input; accepts signals up to V+ − 1.3V |
| 4 | IN− | Comparator A inverting input; matched leakage (±0.01nA) minimizes offset drift |
| 5 | HYST | Hysteresis control input; accepts REF − 50mV to REF for programmable trip-point separation |
| 6 | REF | 1.182V reference output referenced to V−; sources/sinks up to 25μA/15μA |
| 7 | V+ | Positive supply rail; powers internal circuitry and sets upper input/output limits |
| 8 | OUT | Comparator A open-drain output; sinks current to V−, requires external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Dual comparator + reference integration | Reduces BOM count and PCB area vs discrete reference + dual-comparator solutions |
| Adjustable hysteresis via HYST pin | Enables stable threshold detection with only two external resistors - no feedback loop redesign needed |
| Rail-to-rail input common-mode range | Supports direct sensing of signals at or near V−, eliminating level-shifting components in low-side monitoring |
| Ultra-low 6μA max supply current | Extends battery runtime in coin-cell–powered IoT sensors and wearables beyond 5 years |
| Open-drain outputs referenced to V− | Permits interface with multiple logic families (TTL/CMOS) and enables shared-bus alarm signaling |
Applications
| Threshold Detector | Window Comparator |
|---|---|
Use Scenario: Monitoring battery voltage to trigger undervoltage lockout before system reset. IC Role / Device Role / Timing Role: Dual comparator compares battery voltage against upper and lower thresholds derived from internal 1.182V reference. Use Value: Eliminates need for external reference IC and reduces component count by 3–4 parts per channel. | Use Scenario: Validating regulated 5V supply stays within 4.5V–5.5V tolerance band in medical instrumentation. IC Role / Device Role / Timing Role: TSM973CSA+ implements both high- and low-threshold detection with shared reference and hysteresis. Use Value: Achieves ±5mV input hysteresis with resistor network, preventing chatter during slow-varying supply transitions. |
| Battery Switchover Control | Level Translator |
Use Scenario: Seamless transition from wall adapter to backup Li-ion battery when main power fails. IC Role / Device Role / Timing Role: Comparator A detects adapter drop below 4V; Comparator B monitors battery decay below 3.6V. Use Value: Replaces lossy diode-OR with MOSFET-based switchover, improving efficiency by >15% at 1A load. | Use Scenario: Converting ±5V analog sensor outputs to 3.3V logic-compatible digital flags. IC Role / Device Role / Timing Role: Uses internal reference and open-drain outputs to generate clean TTL-level signals from bipolar inputs. Use Value: Enables direct interface between legacy industrial sensors and modern low-voltage microcontrollers without external level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator with reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX973CSA+ | Pin- and function-compatible; identical electrical specs and package; same ±1% reference accuracy over 0°C to +70°C | No functional difference; validated drop-in replacement per Silicon Labs documentation | Select MAX973CSA+ only if legacy MAX branding or existing qualification documentation is required |
| TSM982CSA+ | Same dual-comparator + reference architecture but ±2% reference accuracy and no HYST pin - hysteresis requires external feedback | Suitable for cost-sensitive applications where ±2% reference tolerance is acceptable and hysteresis is not required | Choose TSM982CSA+ when reference accuracy budget allows ±2% and board space permits external hysteresis resistors |
Compared with MAX973CSA+, TSM973CSA+ offers identical performance and drop-in compatibility while being manufactured by Silicon Labs under updated quality and environmental compliance standards; versus TSM982CSA+, it provides tighter ±1% reference and integrated hysteresis control - reducing design risk and component count in precision threshold applications.
Availability
TSM973CSA+ is available at Aetrix Electronics and suitable for battery-powered systems, industrial voltage monitoring, and portable medical devices requiring stable component supply and long-term lifecycle support.
Supply support for TSM973CSA+ 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 sensing applications.
The TSM973CSA+ belongs to Silicon Labs' TSM97x micropower comparator family, designed specifically for energy-constrained systems needing precision voltage monitoring with minimal quiescent current and integrated reference stability.
FAQ
What is the operating temperature range for the TSM973CSA+?
The TSM973CSA+ is rated for 0°C to +70°C ambient operation (Commercial grade). This range is confirmed in the "PACKAGE/ORDERING INFORMATION" table on Page 2 of the datasheet, where "TSM973C" denotes the commercial temperature variant. The "E" suffix (e.g., TSM973ESA+) indicates the extended −40°C to +85°C range - not applicable to the TSM973CSA+.
Does the TSM973CSA+ have a GND pin?
No, the TSM973CSA+ does not have a dedicated GND pin. Pin 1 is labeled "GND" in the pin function table, but its role is to be tied to V− in single-supply configurations - it serves as the output sink reference node, not a universal ground. This is distinct from the TSM971 and TSM984, which feature separate GND and V− pins.
Can the internal reference of the TSM973CSA+ be used to drive external circuitry?
Yes, the TSM973CSA+ REF pin can source up to 25μA and sink up to 15μA while maintaining ±1% accuracy over 0°C to +70°C. The datasheet specifies these current limits in the "REFERENCE" section on Page 5 and confirms stable operation under load in Figure 7 ("Reference Output Voltage vs Output Load Current"). Exceeding these currents degrades reference accuracy.
How is hysteresis implemented on the TSM973CSA+?
Hysteresis on the TSM973CSA+ is implemented via the HYST pin (Pin 5), which accepts a voltage between REF − 50mV and REF. Connecting two resistors - R1 from REF to HYST and R2 from HYST to V− - creates positive feedback that shifts trip points. The hysteresis band equals twice the voltage across R1, with maximum 100mV achievable. Full design equations are provided on Page 13.
Is the TSM973CSA+ pin-compatible with MAX973?
Yes, the TSM973CSA+ is electrically and form-factor identical to the MAX973, as explicitly stated in the "DESCRIPTION" section on Page 1: "The TSM971/972/973/982/984 family [...] is electrically and form-factor identical to the MAX971/972/973/982/984 family." Both use the same 8-pin SOIC package and share identical pin functions and layout.
TSM973CSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
TSM973CSA+ FAQ
1.How can I place an order for TSM973CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM973CSA+ 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 TSM973CSA+ reliable?
The price and inventory of TSM973CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM973CSA+ is usually 5 days.
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TSM973CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM973CSA+ 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 TSM973CSA+?
For technical support, including TSM973CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM973CSA+ requirements.
6.How does Aetrix verify that TSM973CSA+ is sourced from the original manufacturer or authorized distributors?
All TSM973CSA+ 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 TSM973CSA+ meets industry standards.
7.What is the process for return or replacement of TSM973CSA+?
All TSM973CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with TSM973CSA+, 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 TSM973CSA+ part is unused and in its original packaging.
Return procedure for TSM973CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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