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Analog Devices Inc./Maxim Integrated MAX923CPA
- Part No.:
- MAX923CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX923CPA.pdf
- Description:
- IC COMPARATOR 2 W/VOLT REF 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,714
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Product details
Overview
The MAX923CPA from Maxim Integrated is a dual, micropower, low-voltage comparator with internal 1.182V ±1% bandgap reference and programmable hysteresis via HYST pin. It operates from +2.5V to +11V single supply (or ±1.25V to ±5.5V dual supply), draws ≤6µA quiescent current over 0°C to +70°C, and delivers TTL/CMOS-compatible outputs that source up to 40mA. It is used in battery-powered threshold detection and window comparator circuits requiring rail-to-rail input range and ultra-low power.
For engineers reviewing the MAX923CPA datasheet, MAX923CPA pinout, MAX923CPA application, or MAX923CPA equivalent, key selection criteria include guaranteed hysteresis implementation without external feedback, dual-comparator integration in 8-pin DIP, 12µs propagation delay at 10mV overdrive, and compatibility with 3V/5V systems where supply current <6µA and input common-mode range extends to V+ −1.3V are critical.
Technical Context
The MAX923CPA integrates two independent comparators sharing one internal 1.182V reference and one HYST pin for simultaneous hysteresis programming on both channels. Its input stage accepts voltages from V− (GND in single-supply mode) to V+ −1.3V, enabling direct sensing near supply rails. The output stage sources up to 40mA continuously and eliminates crowbar current during transitions, reducing parasitic supply feedback.
Unlike MAX922 (no reference, no hysteresis) or MAX924 (quad, no HYST), the MAX923CPA uniquely combines dual comparators, precision reference, and dedicated hysteresis control in an 8-pin package - enabling compact window detectors and auto-off power switches without external components beyond R1/R2 on HYST.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +11V single supply; enables operation from coin-cell (3V) to industrial (11V) rails without level-shifting. |
| Quiescent Supply Current | ≤6µA at 0°C to +70°C; ensures >1-year battery life in always-on sensor nodes drawing <10µA total system current. |
| Reference Voltage | 1.182V ±1% (0°C to +70°C); provides stable, factory-trimmed threshold for accurate undervoltage/overvoltage detection. |
| Propagation Delay | 12µs at 10mV overdrive; supports response times suitable for slow- to medium-speed monitoring (e.g., power-good assertion, battery charge state). |
| Input Common-Mode Range | V− to V+ −1.3V; allows direct connection of sensors or divider networks referenced to GND without clamping diodes. |
| Output Drive Capability | Sources 40mA continuously; drives LEDs, small relays, or logic inputs directly - eliminating external buffers in discrete threshold circuits. |
| Hysteresis Control | Single HYST pin adjusts hysteresis band from 0mV to 100mV using two resistors; simplifies noise-immune window design with identical hysteresis on both comparators. |
Pinout & Package
MAX923CPA uses an 8-pin plastic DIP package (0.300" wide), through-hole mountable, rated for 0°C to +70°C operation. Pin functions are validated per Maxim's official datasheet revision 7 (1/20).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference; connects to V− in single-supply mode; output swings from V+ to GND. |
| 2 | V− | Negative supply; tied to GND for single supply; defines reference point for REF and input common-mode range. |
| 3 | INA+ | Noninverting input of Comparator A; accepts signals from V− to V+ −1.3V; high-impedance (±0.01nA leakage). |
| 4 | INA− | Inverting input of Comparator A; same voltage range and leakage as INA+; forms first threshold comparison node. |
| 5 | INB− | Inverting input of Comparator B; electrically identical to INA−; enables second independent threshold evaluation. |
| 6 | HYST | Hysteresis control input; voltage range = REF −0.05V to REF; sets symmetrical hysteresis band for both comparators. |
| 7 | REF | 1.182V reference output (vs. V−); supplies precise bias for resistor-divider thresholds; max source/sink = 25µA/15µA. |
| 8 | V+ | Positive supply; supports up to +11V; powers both comparators and reference; decoupling recommended if supply impedance >1Ω. |
Key Features
| Feature | Design Value |
|---|---|
| Dual comparator + reference in 8-pin DIP | Reduces PCB area and BOM count vs. discrete op-amp + reference solutions; eliminates layout-sensitive feedback paths. |
| Programmable hysteresis via single HYST pin | Enables consistent, matched hysteresis on both comparators using only two external resistors - no iterative tuning required. |
| 40mA continuous output source current | Drives LEDs, MOSFET gates, or logic inputs directly - avoids need for external driver transistors in low-power indicator circuits. |
| No crowbar switching current | Prevents supply rail disturbance during output transitions; improves stability in shared-power systems without mandatory bypass caps. |
| Rail-to-rail input common-mode range (to V+ −1.3V) | Supports direct interface with voltage dividers spanning full supply - e.g., 5V system monitoring with 0–5V input without attenuation. |
Applications
| Battery-Powered Threshold Detector | Window Comparator (Undervoltage/Overvoltage) |
|---|---|
|
Use Scenario: Monitoring lithium-ion cell voltage during charging/discharging to trigger cutoff at 4.2V (overvoltage) and 3.0V (undervoltage). IC Role / Device Role / Timing Role: Dual comparator compares divided battery voltage against REF-derived thresholds; HYST sets 50mV hysteresis to prevent chatter near trip points. Use Value: Single MAX923CPA replaces two discrete comparators + reference IC + hysteresis resistors, cutting component count by 60% and layout area by 45%. |
Use Scenario: Validating regulated 5V supply integrity in portable medical devices before enabling analog front-end. IC Role / Device Role / Timing Role: Comparator A detects undervoltage (OUTA active-low when VIN < 4.5V); Comparator B detects overvoltage (OUTB active-low when VIN > 5.5V). Use Value: Internal REF and shared HYST ensure matched threshold accuracy (±1%) and synchronized hysteresis - eliminating drift-induced false triggers across temperature. |
| Oscillator Circuit (Relaxation) | Auto-Off Power Switch |
|
Use Scenario: Generating low-frequency clock (1–10Hz) for RTC backup or LED blink timing in energy-harvesting sensors. IC Role / Device Role / Timing Role: Configured as Schmitt trigger with RC network on INA+; HYST pin sets hysteresis band defining frequency stability. Use Value: Ultra-low 6µA supply current enables oscillator operation for >2 years on a CR2032; no external reference needed due to integrated 1.182V REF. |
Use Scenario: Enabling microcontroller power rail only while user button is pressed, then auto-shutting down after timeout. IC Role / Device Role / Timing Role: Comparator monitors RC decay voltage; OUTA drives P-MOSFET gate; HYST prevents oscillation during slow discharge phase. Use Value: 40mA output drives MOSFET gate directly; 2.5µA quiescent current (typ.) ensures <1µA system standby - extending shelf life of sealed devices. |
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 |
|---|---|---|---|
| MAX923CSA | Same electrical specs; SO-8 surface-mount package instead of PDIP. | Required for automated SMT assembly; not suitable for through-hole prototyping or socketed test fixtures. | Select MAX923CSA for volume production PCBs with reflow capability; retain MAX923CPA for breadboarding, manual assembly, or legacy DIP footprints. |
| TLV3702IDR | No internal reference; rail-to-rail I/O; 850nA supply current; 36V max supply; SO-8 only. | Requires external reference and hysteresis circuitry; better for high-voltage (>11V) or ultra-low-power (<1µA) designs where reference is already present. | Choose TLV3702IDR only if system already includes precision reference and needs lower supply current or higher voltage rating - not a drop-in replacement. |
Compared with MAX923CPA, MAX923CSA offers identical functionality in surface-mount form for production scalability, while TLV3702IDR trades integrated reference and hysteresis simplicity for broader supply range and lower quiescent current - demanding additional external components for equivalent window-detection capability.
Availability
MAX923CPA is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, and window comparators requiring stable component supply with commercial-temperature-grade reliability and long-term obsolescence management.
Supply support for MAX923CPA 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, with emphasis on low-power, high-reliability solutions for industrial and portable systems.
The MAX921–MAX924 family was engineered specifically for micropower comparator applications where sub-10µA supply current, integrated reference, and configurable hysteresis are mandatory - targeting battery-critical instrumentation and safety-monitoring circuits.
FAQ
What is the maximum supply voltage for MAX923CPA in single-supply operation?
The MAX923CPA supports a single-supply voltage range of +2.5V to +11V. At +11V, it maintains full specification compliance including 6µA max supply current and 1.182V ±1% reference accuracy across 0°C to +70°C. Exceeding +11V risks permanent damage per Absolute Maximum Ratings.
Does MAX923CPA require external hysteresis components to function?
No - MAX923CPA operates as a functional comparator without external hysteresis components. The HYST pin defaults to REF when left unconnected, resulting in zero hysteresis. External resistors are optional and only needed when noise immunity requires a defined hysteresis band (0–100mV).
Can MAX923CPA drive an LED directly without a series resistor?
No. While MAX923CPA sources up to 40mA continuously, driving an LED without a current-limiting resistor risks exceeding forward current ratings and damaging the LED or the IC output stage. A series resistor (e.g., 330Ω for 5V supply and red LED) is mandatory for safe operation.
What is the input offset voltage specification for MAX923CPA?
The MAX923CPA has a maximum input offset voltage of ±10mV at VCM = 2.5V, as specified in the Electrical Characteristics table. This value applies across the full commercial temperature range (0°C to +70°C) and directly impacts threshold accuracy in precision detection circuits.
Is the reference voltage of MAX923CPA referenced to GND or V−?
The MAX923CPA reference voltage (1.182V) is referenced to V−, not GND. In single-supply operation where V− = GND, REF = 1.182V above GND. In dual-supply operation (e.g., V+ = +5V, V− = −5V), REF = 1.182V above −5V (i.e., −3.818V), requiring careful level translation in downstream circuits.
MAX923CPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- with Voltage Reference
- Number of Elements:
- 2
- Output Type:
- CMOS, TTL
- Voltage - Supply, Single/Dual (±):
- 2.5V ~ 11V, ±1.25V ~ 5.5V
- :
- 10mV @ 5V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- 50mA
- Current - Output (Typ):
- 7.5µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 12µs
- Propagation Delay (Max):
- 50mV
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Through Hole
- :
- 8-PDIP
MAX923CPA FAQ
1.How can I place an order for MAX923CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX923CPA 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 MAX923CPA reliable?
The price and inventory of MAX923CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX923CPA is usually 5 days.
3.What payment methods are accepted for MAX923CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX923CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX923CPA?
MAX923CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX923CPA 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 MAX923CPA?
For technical support, including MAX923CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX923CPA requirements.
6.How does Aetrix verify that MAX923CPA is sourced from the original manufacturer or authorized distributors?
All MAX923CPA 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 MAX923CPA meets industry standards.
7.What is the process for return or replacement of MAX923CPA?
All MAX923CPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX923CPA, 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 MAX923CPA part is unused and in its original packaging.
Return procedure for MAX923CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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