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Analog Devices Inc./Maxim Integrated MAX942ESA
- Part No.:
- MAX942ESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX942ESA.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,627
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Product details
Overview
MAX942ESA from Maxim Integrated is a dual high-speed comparator optimized for 3V/5V single-supply systems, featuring rail-to-rail inputs, 80ns propagation delay (5mV overdrive), 350μA per comparator supply current, and CMOS/TTL-compatible push-pull outputs. It operates across –40°C to +85°C and is used in battery-powered threshold detection and line receiver circuits.
For engineers reviewing the MAX942ESA datasheet, MAX942ESA pinout, MAX942ESA application, or MAX942ESA equivalent, key selection criteria include input common-mode range beyond rails (–0.2V to V+ + 0.2V), low 1mV typical offset voltage, internal hysteresis for noise immunity, and SO-8 package compatibility with standard PCB footprints.
Technical Context
The MAX942ESA implements a bipolar process-based comparator core with rail-to-rail input stage enabling operation with inputs extended 0.2V beyond either supply rail. Its output stage delivers push-pull drive without external pullups, sinking/sourcing up to 4mA while maintaining VOH ≥ V+ – 0.4V and VOL ≤ 0.4V.
Internal hysteresis (typical 3mV input-referred width) eliminates need for external feedback networks. Propagation delay skew between channels is ≤10ns, and differential propagation delay is ≤10ns - critical for matched dual-channel timing in sampling circuits and zero-crossing detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +5.5V - supports direct interface with Li-ion battery (3.0–4.2V) and 3.3V/5V logic domains. |
| Propagation Delay | 80ns (typ, 5mV overdrive) - enables reliable sampling of signals up to ~10MHz edge rates. |
| Input Offset Voltage | 1mV (typ, TA = +25°C), 3mV (max, –40°C to +85°C) - ensures accurate threshold discrimination at low signal differentials. |
| Rail-to-Rail Input Range | –0.2V to V+ + 0.2V - allows direct sensing of signals below GND or above V+, e.g., AC-coupled sensor outputs. |
| Output Drive Capability | VOH ≥ V+ – 0.4V, VOL ≤ 0.4V at 400μA - directly drives CMOS inputs without level-shifting or pull-up resistors. |
| Supply Current per Comparator | 350μA (typ, V+ = 3V), 400μA (typ, V+ = 5V) - enables dual-channel operation under 1mA total, ideal for portable equipment. |
| Common-Mode Rejection | 80μV/V (min) - maintains stable trip points despite supply ripple or ground bounce in noisy environments. |
Pinout & Package
MAX942ESA is housed in an 8-pin SO (Small Outline) package, 150 mil width, RoHS-compliant, with standard JEDEC MS-012AC outline and thermal pad not present.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Comparator A open-drain/push-pull output - active-high when IN+ > IN–; compatible with CMOS/TTL loads. |
| 2 | INA– | Inverting input for Comparator A - accepts voltages from –0.2V to V+ + 0.2V; protected by internal clamp diodes. |
| 3 | INA+ | Noninverting input for Comparator A - same rail-to-rail range and protection as INA–. |
| 4 | V+ | Positive supply pin - must be ≤ +6.5V; decoupling capacitor required adjacent to this pin for stability. |
| 5 | INB+ | Noninverting input for Comparator B - electrically isolated from Channel A; supports independent thresholds. |
| 6 | INB– | Inverting input for Comparator B - matched offset and delay characteristics to INA± within 10ns skew. |
| 7 | OUTB | Comparator B output - independently controlled; no cross-talk with OUTA under normal operation. |
| 8 | GND | Analog ground reference - must connect to low-impedance system ground plane to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range | Extends –0.2V below GND and +0.2V above V+, enabling direct interface with AC-coupled sensors and transducers. |
| Internal hysteresis | ~3mV input-referred width eliminates external feedback components and prevents oscillation on slow or noisy inputs. |
| Low quiescent current | 350μA per comparator at 3V allows dual-channel operation under 1mA - extends battery life in portable instruments. |
| CMOS/TTL-compatible outputs | Push-pull structure delivers full rail swing without pull-ups, reducing BOM count and board space in digital interface circuits. |
| Robust input protection | Back-to-back diodes and 4.1kΩ series resistors withstand continuous short-circuit faults to either rail without damage. |
Applications
| Battery-Powered Threshold Detector | Industrial Line Receiver |
|---|---|
|
Use Scenario: Monitoring battery cell voltage against low-charge cutoff (e.g., 3.0V) in handheld medical devices. IC Role / Device Role / Timing Role: Dual comparator provides independent high/low threshold detection with hysteresis to prevent chatter near trip points. Use Value: 80ns response enables real-time state updates; rail-to-rail inputs accept direct cell measurement without level shifting. |
Use Scenario: Converting differential RS-422/RS-485 bus signals into single-ended logic levels for microcontroller GPIO. IC Role / Device Role / Timing Role: Comparator A compares bus A–B to zero; Comparator B validates complementary polarity for noise rejection. Use Value: Matched propagation delay (<10ns skew) preserves signal integrity; 350μA/channel minimizes power in always-on comms modules. |
| Zero-Crossing Detector for AC Mains | Sampling Circuit Trigger Generator |
|
Use Scenario: Detecting AC line zero crossings in smart energy meters using transformer-coupled, attenuated 230VAC waveform. IC Role / Device Role / Timing Role: Comparator compares scaled AC signal to GND reference; internal hysteresis rejects EMI-induced false triggers. Use Value: Input range down to –0.2V accommodates negative half-cycle without biasing; 1mV offset ensures symmetric trip accuracy. |
Use Scenario: Generating precise sample-enable pulses synchronized to analog signal edges in data acquisition systems. IC Role / Device Role / Timing Role: One channel detects rising edge of analog trigger; second channel verifies hold time before ADC conversion start. Use Value: 80ns delay and <10ns inter-channel skew enable sub-12.5ns timing resolution for 80MSPS sampling control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Slower (300ns propagation delay), higher supply current (1.2mA per comparator), no rail-to-rail inputs (CM range = 0V to V+ – 1.5V). | Suitable only for DC or low-frequency threshold detection where speed and input range are non-critical. | Select LM393DR only if cost is primary constraint and performance specs (speed, rail-to-rail, quiescent current) are relaxed. |
| TLV3502IDR | Faster (4.5ns delay), lower offset (0.5mV typ), but requires dual supply (±2.5V) or level-shifted inputs for single-supply use. | Preferred in high-speed test equipment; unsuitable for direct 3V/5V single-supply battery interfaces without additional circuitry. | Choose TLV3502IDR when nanosecond timing is mandatory and dual-supply infrastructure exists; avoid for portable 3V designs. |
Compared with LM393DR and TLV3502IDR, the MAX942ESA uniquely balances 80ns speed, rail-to-rail input capability, and 350μA/channel quiescent current in a single 3V/5V supply configuration - making it optimal for space- and power-constrained embedded sensing.
Availability
MAX942ESA is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial line receivers, and precision zero-crossing detection requiring stable component supply across –40°C to +85°C.
Supply support for MAX942ESA 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX94x family was designed specifically for low-voltage, high-speed comparator applications in portable and single-supply systems - emphasizing rail-to-rail operation, low power, and integrated hysteresis without external components.
FAQ
What is the operating temperature range for MAX942ESA?
The MAX942ESA is rated for operation from –40°C to +85°C. This extended industrial temperature range ensures reliable performance in automotive cabin modules, outdoor industrial sensors, and battery-powered portable equipment exposed to ambient thermal cycling. The device's electrical specifications - including propagation delay, offset voltage, and supply current - are guaranteed across this full range.
Does MAX942ESA require external pull-up resistors on its outputs?
No, MAX942ESA does not require external pull-up resistors. Its outputs are push-pull (not open-drain), capable of actively driving high to within 0.4V of V+ and low to within 0.4V of GND at 400μA load. This eliminates external components in CMOS/TTL interfacing, simplifying layout and reducing BOM cost - a key advantage over comparators like LM393 that mandate pull-ups.
Can MAX942ESA operate from a 2.7V supply?
Yes, MAX942ESA is fully specified to operate from +2.7V to +5.5V. At 2.7V, it maintains 80ns typical propagation delay (5mV overdrive), 350μA per comparator supply current, and rail-to-rail input range (–0.2V to 2.9V). This makes it suitable for single-cell Li-ion (2.7–4.2V) and 3.3V systems where headroom is constrained.
What is the input common-mode voltage range of MAX942ESA?
The input common-mode voltage range of MAX942ESA is –0.2V to V+ + 0.2V. This rail-to-rail-plus margin allows direct connection of AC-coupled signals, thermocouple outputs, or sensor bridges without level-shifting circuitry. For example, with V+ = 3.3V, inputs may swing from –0.2V to +3.5V - exceeding supply rails safely due to internal protection diodes and resistor network.
Is MAX942ESA pin-compatible with other packages in the MAX942 family?
Yes, MAX942ESA (SO-8) shares identical pinout with MAX942EPA (PDIP-8) and MAX942EUA-T (μMAX-8). All three variants use the same 1–8 pin assignment: OUTA, INA–, INA+, V+, INB+, INB–, OUTB, GND. This enables drop-in replacement across package types during prototyping, thermal optimization, or volume manufacturing without PCB redesign.
MAX942ESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- CMOS, Push-Pull, TTL
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 5.5V
- :
- 2mV @ 5.5V
- Voltage - Input Offset (Max):
- 0.15µA @ 5.5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 600µA
- Current - Quiescent (Max):
- 81.94dB CMRR, 81.94dB PSRR
- CMRR, PSRR (Typ):
- 80ns
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
MAX942ESA FAQ
1.How can I place an order for MAX942ESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX942ESA 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 MAX942ESA reliable?
The price and inventory of MAX942ESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX942ESA is usually 5 days.
3.What payment methods are accepted for MAX942ESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX942ESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX942ESA?
MAX942ESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX942ESA 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 MAX942ESA?
For technical support, including MAX942ESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX942ESA requirements.
6.How does Aetrix verify that MAX942ESA is sourced from the original manufacturer or authorized distributors?
All MAX942ESA 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 MAX942ESA meets industry standards.
7.What is the process for return or replacement of MAX942ESA?
All MAX942ESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX942ESA, 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 MAX942ESA part is unused and in its original packaging.
Return procedure for MAX942ESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX942ESA Tags
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LM339DR
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LM339PWR
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LM393DT
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LM2903DT
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LM393DR
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LM239DR
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NCX2200GMAZ
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