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Analog Devices Inc./Maxim Integrated MAX973ESA+T
- Part No.:
- MAX973ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX973ESA+T.pdf
- Description:
- IC COMPARATOR 2 W/VOLT REF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,249
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Product details
Overview
MAX973ESA+T from Maxim Integrated is a dual ultra-low-power comparator with integrated 1.182V ±1% voltage reference and programmable hysteresis via HYST pin. It operates from single 2.5V–11V or dual ±1.25V–±5.5V supplies, features open-drain outputs sinking to V−, and supports rail-to-rail input voltage range down to V− and up to V+ − 1.3V - ideal for battery-powered threshold detection and window comparators.
For engineers reviewing the MAX973ESA+T datasheet, MAX973ESA+T pinout, MAX973ESA+T application, or MAX973ESA+T equivalent, key selection criteria include its 4µA max supply current over temperature, internal reference accuracy, HYST-pin hysteresis programming method, and SO-8 package compatibility with space-constrained industrial and portable designs.
Technical Context
The MAX973ESA+T integrates two independent micropower comparators sharing a single precision bandgap reference (1.182V ±1% at 0°C to +70°C). Its HYST pin enables simple resistor-based hysteresis configuration without external feedback, delivering symmetric upper/lower thresholds centered on the reference voltage.
Each comparator features rail-to-rail input operation (V− to V+ − 1.3V), open-drain output stage sinking to V−, and propagation delay of 12µs (10mV overdrive). The device supports true dual-supply operation with separate V+ and V− pins, and its output stage remains functional even when V+ = V− = 0V (output voltage up to 11V referenced to V−).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | <4µA max 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 accurate voltage monitoring |
| Input Common-Mode Range | V− to V+ − 1.3V - supports direct sensing of signals near supply rails without level shifting |
| Propagation Delay | 12µs (10mV overdrive) - balances speed and ultra-low power for wake-up and alert applications |
| Output Type | Open-drain, sinks to V− - enables wire-ORing, level translation, and bipolar-to-single-ended conversion |
| Operating Supply | Single 2.5V–11V or dual ±1.25V–±5.5V - accommodates wide input voltage ranges in mixed-supply systems |
Pinout & Package
MAX973ESA+T is housed in an 8-pin SO (Small Outline) package with standard 150-mil width and 0.050" lead pitch. Pin 1 is marked by a beveled corner or dot; the package is RoHS-compliant and rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTA) | Comparator A open-drain output | Sinks current to V−; requires external pullup for logic-level output |
| 2 (V−) | Negative supply | Connect to GND for single-supply operation; defines reference point for REF and output sink |
| 3 (INA+) | Noninverting input of Comparator A | Rail-to-rail capable; accepts voltages from V− to V+ − 1.3V |
| 4 (INA−) | Inverting input of Comparator A | Same common-mode range as INA+; used with INA+ for differential or single-ended comparison |
| 5 (HYST) | Hysteresis control input | Accepts voltage from REF − 50mV to REF; sets hysteresis band width via external resistors |
| 6 (REF) | Internal reference output | 1.182V ±1% w.r.t. V−; sources/sinks up to 25µA/15µA; must not be bypassed |
| 7 (V+) | Positive supply | Supplies bias for internal circuitry and output driver gate; determines output sink capability |
| 8 (OUTB) | Comparator B open-drain output | Functionally identical to OUTA; shares same REF and HYST resources |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | <4µA max across −40°C to +85°C - eliminates need for shutdown sequencing in energy-harvesting systems |
| Integrated 1.182V ±1% reference | Factory-trimmed, no external components required - reduces BOM count and layout area vs. discrete reference + comparator solutions |
| HYST-pin hysteresis programming | Two-resistor setup replaces complex feedback networks - simplifies design of noise-immune threshold detectors |
| Open-drain outputs sinking to V− | Enables level translation between disparate supply domains (e.g., ±5V inputs to 3.3V logic) without additional transistors |
| Rail-to-rail input range | V− to V+ − 1.3V - allows direct interface to sensors, battery terminals, and unbuffered analog signals |
Applications
| Battery Voltage Monitor | Window Detector (UV/OV) |
|---|---|
Use Scenario: Monitoring Li-ion or multi-cell alkaline battery voltage to trigger low-battery alerts or switchover to backup power. IC Role / Device Role / Timing Role: Dual comparator compares battery voltage against upper (OV) and lower (UV) thresholds derived from REF and resistor dividers. Use Value: Enables precise, hysteresis-stabilized UV/OV detection using only MAX973ESA+T, four resistors, and one pullup - no external reference or op-amps needed. | Use Scenario: Validating regulated DC supply (e.g., 5V or 3.3V rail) stays within safe operating window before enabling downstream logic. IC Role / Device Role / Timing Role: One comparator detects undervoltage (OUTA active-low), the other detects overvoltage (OUTB active-low); outputs wire-ORed to generate active-high "power good" signal. Use Value: Single IC replaces two discrete comparators and external hysteresis network - reduces footprint by >40% and improves threshold matching vs. separate devices. |
| Level Translator | Oscillator Circuit (Relaxation) |
Use Scenario: Converting ±5V analog signals (e.g., from legacy industrial sensors) into 0–3.3V logic-compatible outputs for MCU ADC or GPIO. IC Role / Device Role / Timing Role: Comparator A compares bipolar input against REF; open-drain output pulled to 3.3V generates single-ended digital output. Use Value: Eliminates need for rail-splitter or dedicated level-shifter IC - leverages internal REF and V−-referenced output for clean translation with <12µs latency. | Use Scenario: Building low-power relaxation oscillator for timing, clock generation, or LED blink control in battery-operated devices. IC Role / Device Role / Timing Role: Comparator B forms hysteresis loop with capacitor and resistor; REF provides stable threshold; HYST pin configures oscillation frequency. Use Value: Achieves sub-µA standby current while generating precise, temperature-stable frequency - outperforms RC timers using general-purpose op-amps. |
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 |
|---|---|---|---|
| MAX983ESA+ | Same pinout and function, but ±2% reference accuracy (vs. ±1% in MAX973ESA+T) | Suitable where cost sensitivity outweighs tight threshold tolerance; identical hysteresis implementation and supply current | Select MAX983ESA+ when ±2% reference drift is acceptable and budget constraints apply |
| TLV3702IDR | No integrated reference; requires external voltage source; higher 800nA supply current; rail-to-rail I/O | Used where flexible reference selection is needed or where higher speed (<1µs) is required; lacks HYST-pin simplicity | Choose TLV3702IDR only if external reference flexibility or faster response is mandatory - adds BOM and layout complexity |
Compared with MAX983ESA+, MAX973ESA+T delivers tighter reference accuracy for critical voltage monitoring; compared with TLV3702IDR, it eliminates external reference and simplifies hysteresis design at the cost of slightly higher propagation delay - making it optimal for ultra-low-power, space-constrained threshold detection.
Availability
MAX973ESA+T is available at Aetrix Electronics and suitable for battery-powered systems, industrial sensor interfaces, and portable medical devices requiring stable component supply with extended temperature support (−40°C to +85°C).
Supply support for MAX973ESA+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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX97x/MAX98x comparator family targets ultra-low-power, high-accuracy voltage monitoring in energy-constrained systems - emphasizing micropower operation, integrated references, and simplified hysteresis implementation.
FAQ
What is the reference voltage tolerance of MAX973ESA+T over temperature?
The MAX973ESA+T features a 1.182V internal reference with ±1% initial accuracy over the commercial temperature range (0°C to +70°C). Over the extended range (−40°C to +85°C), the datasheet specifies ±2% maximum deviation - confirmed in the Electrical Characteristics table under "Reference Voltage" for MAX973. This tolerance directly impacts threshold accuracy in battery monitor and UV/OV detector circuits using MAX973ESA+T.
Can MAX973ESA+T operate from a single 3V supply?
Yes, MAX973ESA+T is fully specified for single-supply operation from 2.5V to 11V. At 3V, typical supply current is 3.4µA (C temp range) or 4.3µA (E temp range), input common-mode range extends from V− (GND) to 1.7V, and propagation delay increases slightly to ~14µs (10mV overdrive). All functions - including REF output and HYST-pin hysteresis - remain operational per the 3V Electrical Characteristics tables.
How is hysteresis programmed on MAX973ESA+T?
Hysteresis on MAX973ESA+T is programmed using the HYST pin: connect R1 between REF and HYST, and R2 between HYST and V−. The hysteresis band (VHB) ≈ 2 × (VREF − VHYST), with VHYST adjustable from REF − 50mV to REF. For example, setting VHYST = REF − 25mV yields ~50mV hysteresis. This method avoids external feedback and is validated in Figure 3 and Applications Information section of the MAX973ESA+T datasheet.
Does MAX973ESA+T support dual-supply operation?
Yes, MAX973ESA+T supports true dual-supply operation from ±1.25V to ±5.5V. In this mode, V+ connects to the positive rail (e.g., +5V), V− connects to the negative rail (e.g., −5V), and GND is unused. Inputs swing from V− to V+ − 1.3V, REF is 1.182V above V−, and outputs sink to V−. This configuration enables bipolar signal conditioning and level translation - confirmed in the General Description and Power-Supply section.
What is the maximum output sink current for MAX973ESA+T?
The MAX973ESA+T output stage is rated for continuous 50mA sink current (absolute maximum rating), with typical VOL = 0.4V at IOUT = 1.8mA (V+ = 5V) and VOL = 0.4V at IOUT = 0.8mA (V+ = 3V). The actual sink capability scales with V+ - higher supply voltage improves drive strength. This performance is documented in the "Output Low Voltage" specifications under both 5V and 3V operation conditions.
MAX973ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- with Voltage Reference
- Number of Elements:
- 2
- Output Type:
- Open-Drain
- Voltage - Supply, Single/Dual (±):
- 2.5V ~ 11V, ±1.25V ~ 5.5V
- :
- 10mV @ 5V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 6µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- 50mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
MAX973ESA+T FAQ
1.How can I place an order for MAX973ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX973ESA+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 MAX973ESA+T reliable?
The price and inventory of MAX973ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX973ESA+T is usually 5 days.
3.What payment methods are accepted for MAX973ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX973ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX973ESA+T?
MAX973ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX973ESA+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 MAX973ESA+T?
For technical support, including MAX973ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX973ESA+T requirements.
6.How does Aetrix verify that MAX973ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX973ESA+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 MAX973ESA+T meets industry standards.
7.What is the process for return or replacement of MAX973ESA+T?
All MAX973ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX973ESA+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 MAX973ESA+T part is unused and in its original packaging.
Return procedure for MAX973ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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