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Analog Devices Inc./Maxim Integrated MAX923EPA
- Part No.:
- MAX923EPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX923EPA.pdf
- Description:
- IC COMPARATOR 2 W/VOLT REF 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,688
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Product details
Overview
The MAX923EPA 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 –40°C to +85°C, and features 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 stable reference.
For engineers reviewing the MAX923EPA datasheet, MAX923EPA pinout, MAX923EPA application, or MAX923EPA equivalent, key selection criteria include guaranteed hysteresis implementation without external feedback, dual-comparator integration in 8-pin DIP, extended temperature operation, and compatibility with 3V/5V systems where ultra-low supply current and internal reference reduce BOM count.
Technical Context
The MAX923EPA integrates two independent comparators sharing a common internal 1.182V reference and dedicated HYST pin for simultaneous hysteresis programming on both channels. Its input common-mode range extends from V– to (V+ – 1.3V), enabling operation near supply rails, and its output stage eliminates crowbar current during transitions-reducing parasitic supply feedback and improving layout tolerance.
Unlike MAX922/MAX924, the MAX923EPA supports hysteresis via a single external resistor pair connected to HYST and REF, delivering matched hysteresis bands across both comparators without additional components or accuracy degradation from input leakage. The device maintains <±10mV input offset and <5nA input leakage over its full operating temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +11V single supply or ±1.25V to ±5.5V dual supply - supports direct interfacing with 3V/5V logic and bipolar sensor signals. |
| Quiescent Supply Current | ≤6µA at –40°C to +85°C - enables multi-year operation in coin-cell–powered IoT sensors and portable instrumentation. |
| Internal Reference Voltage | 1.182V ±1% (E-temp range) referenced to V– - eliminates need for external precision reference in threshold-detection designs. |
| Propagation Delay | 12µs typical (10mV overdrive) - provides predictable timing for analog-to-digital decision circuits with minimal latency. |
| Output Drive Capability | 40mA continuous source / 50mA sink - directly drives LEDs, small relays, or logic inputs without buffer stages. |
| Input Offset Voltage | ±10mV max - ensures accurate trip-point setting in precision voltage monitoring applications. |
| Hysteresis Control | Adjustable via HYST pin (REF – 0.05V to REF) - enables user-defined hysteresis band up to 100mV without external op-amps or feedback networks. |
Pinout & Package
MAX923EPA uses an 8-pin plastic DIP package (0.300" wide) with through-hole mounting. Pin 1 is OUTA, Pin 2 is V+, Pin 3 is REF, Pin 4 is HYST, Pin 5 is INB–, Pin 6 is INA+, Pin 7 is V–, and Pin 8 is OUTB. All pins are electrically validated per Maxim's official pin configuration diagram for MAX923 (DIP/SO/μMAX top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTA) | Comparator A output | Sinks and sources current; swings from V+ to V– - enables direct connection to TTL/CMOS loads or discrete switches. |
| 2 (V+) | Positive supply | Accepts +2.5V to +11V - defines upper rail for both comparators and reference; no bypass capacitor required under low-impedance conditions. |
| 3 (REF) | Reference output | 1.182V ±1% w.r.t. V– - serves as precision threshold source for both comparators and HYST network; must not be bypassed. |
| 4 (HYST) | Hysteresis control input | Accepts voltage from REF – 50mV to REF - sets hysteresis band width; connects to resistor divider for user-programmable noise immunity. |
| 5 (INB–) | Inverting input of comparator B | Supports rail-to-rail common-mode range (V– to V+ – 1.3V) - allows direct sensing of battery voltage or transducer outputs without level-shifting. |
| 6 (INA+) | Noninverting input of comparator A | Leakage <±5nA at E-temp - minimizes error in high-impedance voltage-divider threshold networks. |
| 7 (V–) | Negative supply | Connect to GND for single-supply use; defines reference point for REF and output swing - enables true dual-supply operation down to ±1.25V. |
| 8 (OUTB) | Comparator B output | Functionally identical to OUTA - permits independent dual-threshold detection (e.g., under/overvoltage window) with matched hysteresis. |
Key Features
| Feature | Design Value |
|---|---|
| Dual comparators with shared reference | Reduces component count and layout area vs. two discrete MAX921s; ensures reference tracking between channels. |
| Programmable hysteresis via HYST pin | Enables precise, matched hysteresis on both comparators using only two resistors - avoids instability from external positive-feedback loops. |
| 40mA continuous output source current | Drives LEDs, MOSFET gates, or logic inputs directly - eliminates need for external driver transistors in low-power indicator or control circuits. |
| No crowbar switching current | Prevents supply-line glitches during output transitions - improves system stability and reduces need for aggressive power-supply decoupling. |
| Rail-to-rail input common-mode range | Operates with inputs from V– to V+ – 1.3V - supports direct interface with sensors, batteries, and DAC outputs without signal conditioning. |
Applications
| Battery Voltage Monitor | Window Comparator |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage (2.5V–4.2V) to trigger low-battery warning and overvoltage shutdown in portable medical devices. IC Role / Device Role / Timing Role: MAX923EPA acts as dual-threshold detector: OUTA asserts low at 3.0V (undervoltage), OUTB asserts low at 4.15V (overvoltage); HYST pin configures 50mV hysteresis per channel. Use Value: Eliminates external reference and hysteresis resistors, reducing BOM by ≥4 components while maintaining ±1% trip accuracy across –40°C to +85°C. |
Use Scenario: Validating regulated 5V supply integrity in industrial PLC I/O modules, asserting "power good" only when voltage stays within 4.75V–5.25V. IC Role / Device Role / Timing Role: MAX923EPA compares supply against precision thresholds derived from internal REF; AND-gated outputs generate clean enable signal with glitch-free edges. Use Value: Internal 1.182V reference and matched comparator offsets ensure symmetric hysteresis bands, preventing chatter during slow supply ramp-up/down. |
| Oscillator Circuit | Auto-Power-Off Switch |
|
Use Scenario: Building relaxation oscillator for LED blink rate control in asset-tracking tags powered by CR2032 coin cells. IC Role / Device Role / Timing Role: MAX923EPA configured as hysteresis comparator with RC timing network on INA+; OUTB toggles charging/discharging of timing capacitor. Use Value: Ultra-low 6µA quiescent current extends oscillator runtime; 12µs propagation delay ensures predictable frequency stability across voltage and temperature. |
Use Scenario: Enabling timed shutdown of microcontroller subsystems after button press in handheld test equipment. IC Role / Device Role / Timing Role: MAX923EPA senses RC decay voltage on INA+; OUTA drives MOSFET gate to cut power after ~90s, then resets via momentary switch. Use Value: High 40mA output drive directly controls power FET; internal reference replaces external voltage divider, improving long-term drift performance. |
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 |
|---|---|---|---|
| MAX923ESA | Same electrical specs, but in 8-pin SO package - smaller footprint, surface-mount only. | Preferred for space-constrained PCBs; requires reflow assembly instead of through-hole. | Select MAX923ESA when board real estate is limited and SMT capability exists; MAX923EPA remains optimal for prototyping, repair, or mixed-technology boards. |
| TLV3702IDR | Single-supply only (2.7V–16V), no internal reference, 850nA quiescent current, 360µs propagation delay. | Requires external reference and hysteresis circuitry; higher power, slower response. | Choose TLV3702IDR only if supply >2.7V is guaranteed and cost-per-function is prioritized over design simplicity and speed. |
Compared with MAX923ESA and TLV3702IDR, the MAX923EPA uniquely combines through-hole DIP packaging, integrated ±1% reference, sub-6µA quiescent current, and 12µs propagation delay - making it the only option satisfying all four requirements simultaneously for rugged, low-power dual-threshold detection.
Availability
MAX923EPA is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and oscillator circuits requiring stable component supply across industrial temperature ranges.
Supply support for MAX923EPA 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, medical, and communications markets.
The MAX921–MAX924 family was engineered specifically for ultra-low-power, single/dual-supply comparator applications where internal reference, programmable hysteresis, and robust output drive eliminate supporting components in portable and remote-sensing systems.
FAQ
What is the maximum supply voltage for MAX923EPA in single-supply operation?
The MAX923EPA supports a single-supply voltage range of +2.5V to +11V. When V– is connected to GND, the absolute maximum voltage applied between V+ and GND is +12V per Absolute Maximum Ratings, but functional operation is guaranteed only up to +11V. Exceeding +11V may degrade reference accuracy or increase supply current beyond specification.
Does MAX923EPA require external hysteresis components?
No - the MAX923EPA includes a dedicated HYST pin that enables user-programmable hysteresis using just two external resistors (R1 from REF to HYST, R2 from HYST to V–). This eliminates the need for external op-amps or feedback networks, and ensures matched hysteresis on both comparators without degrading speed or accuracy.
Can MAX923EPA operate from a ±5V dual supply?
Yes - the MAX923EPA is fully specified for dual-supply operation from ±1.25V to ±5.5V. With V+ = +5V and V– = –5V, the internal reference remains 1.182V above V– (i.e., –3.818V relative to GND), and both comparators maintain rail-to-rail input range and full output swing from +5V to –5V.
What is the output voltage swing of MAX923EPA?
The MAX923EPA outputs swing from V+ to V– under all operating conditions. In single-supply mode (V– = GND), OUTA and OUTB swing from V+ to GND. In dual-supply mode, they swing fully from V+ to V–, providing true bipolar output capability compatible with TTL/CMOS logic when referenced appropriately.
Is the internal reference of MAX923EPA buffered or unbuffered?
The internal 1.182V reference of MAX923EPA is unbuffered - it is designed to drive only the internal comparators and the external HYST network. Maxim explicitly advises against bypassing REF or connecting capacitive loads >100pF, as this can cause oscillation or reference voltage droop. For external reference use, a dedicated buffered reference IC is recommended.
MAX923EPA 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:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Through Hole
- :
- 8-PDIP
MAX923EPA FAQ
1.How can I place an order for MAX923EPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX923EPA 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 MAX923EPA reliable?
The price and inventory of MAX923EPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX923EPA is usually 5 days.
3.What payment methods are accepted for MAX923EPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX923EPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX923EPA?
MAX923EPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX923EPA 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 MAX923EPA?
For technical support, including MAX923EPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX923EPA requirements.
6.How does Aetrix verify that MAX923EPA is sourced from the original manufacturer or authorized distributors?
All MAX923EPA 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 MAX923EPA meets industry standards.
7.What is the process for return or replacement of MAX923EPA?
All MAX923EPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX923EPA, 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 MAX923EPA part is unused and in its original packaging.
Return procedure for MAX923EPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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