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Analog Devices Inc./Maxim Integrated MAX933EPA
- Part No.:
- MAX933EPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX933EPA.pdf
- Description:
- IC COMPARATOR 2 W/VOLT REF 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,378
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Product details
Overview
MAX933EPA from Maxim Integrated is a dual micropower comparator with integrated 1.182V ±2% bandgap reference, programmable hysteresis via HYST pin, TTL/CMOS-compatible outputs sourcing up to 40mA, and operation from +2.5V to +11V single supply (or ±1.25V to ±5.5V dual supply). It targets battery-powered threshold detection and window comparator circuits requiring ultra-low quiescent current (≤4µA over temperature) and rail-to-rail input range down to V−.
For engineers reviewing the MAX933EPA datasheet, MAX933EPA pinout, MAX933EPA application, or MAX933EPA equivalent, key selection considerations include its dual-comparator architecture with shared reference and hysteresis control, guaranteed −40°C to +85°C industrial temperature range, 8-pin plastic DIP package, and compatibility with low-voltage (≥2.5V) single-supply systems where power efficiency and noise immunity are critical.
Technical Context
The MAX933EPA integrates two independent comparators sharing a precision internal reference and a dedicated HYST terminal for resistor-programmable hysteresis without external feedback. Its output stage eliminates crowbar current during transitions, reducing parasitic supply feedback and improving stability in noisy layouts.
Input common-mode range extends from V− to (V+ − 1.3V), enabling direct sensing near supply rails. The REF pin delivers 1.182V referenced to V− (not GND), with ±2% accuracy over 0°C to +70°C and ±2.5% over −40°C to +85°C per datasheet specifications. Propagation delay is 12µs typical at 10mV overdrive (5V supply).
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 both battery-powered and bipolar signal monitoring applications. |
| Quiescent Supply Current | ≤4µA over −40°C to +85°C - enables multi-year operation on coin-cell batteries in always-on sensing nodes. |
| Reference Voltage | 1.182V ±2% (0°C to +70°C), ±2.5% (−40°C to +85°C) referenced to V− - provides stable threshold generation without external components. |
| Input Common-Mode Range | V− to (V+ − 1.3V) - allows direct interface with sensors or signals operating near ground or supply rails. |
| Output Drive Capability | Sources ≥40mA continuously, sinks ≥8mA - drives LEDs, small relays, or logic inputs directly without buffer stages. |
| Propagation Delay | 12µs typical at 10mV overdrive (5V, TA = +25°C) - balances speed and ultra-low power for non-critical timing applications. |
| Hysteresis Control | HYST pin accepts 1.132V to 1.182V (REF − 50mV to REF) - enables precise 0–100mV hysteresis band using two resistors, eliminating external op-amp feedback loops. |
Pinout & Package
MAX933EPA is housed in an 8-pin plastic DIP package (0.300" wide), rated for −40°C to +85°C operation. Pin spacing is 0.100", compatible with standard through-hole PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Comparator A output; sinks and sources current; swings from V+ to V− - enables dual-supply level shifting or single-supply TTL-compatible operation when V− = GND. |
| 2 | V− | Negative supply terminal; connect to GND for single-supply use - 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 | INB− | Inverting input of comparator B - identical electrical characteristics to INA+; supports differential or single-ended configurations. |
| 5 | INB+ | Noninverting input of comparator B - enables independent threshold setting for second comparator channel. |
| 6 | REF | Internal 1.182V bandgap reference output referenced to V− - supplies stable voltage for both comparators' threshold generation. |
| 7 | V+ | Positive supply terminal - accepts +2.5V to +11V (single) or ±1.25V to ±5.5V (dual) with no external decoupling required under low-impedance conditions. |
| 8 | OUTB | Comparator B output; sinks and sources current; swings from V+ to V− - provides fully independent second decision channel with same drive strength as OUTA. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | ≤4µA over full −40°C to +85°C range - reduces battery drain in portable instrumentation and remote sensors. |
| Integrated 2% reference | 1.182V ±2.5% over industrial temp. range - eliminates need for external reference IC or precision resistor divider in threshold detection. |
| Resistor-programmable hysteresis | 0–100mV adjustable band via HYST pin and two resistors - prevents oscillation near thresholds without layout-sensitive positive feedback networks. |
| No crowbar output switching | Eliminates simultaneous high-side/low-side conduction during state transitions - removes requirement for supply bypassing and improves EMC robustness. |
| Rail-to-rail input capability | Operates with inputs down to V− and up to (V+ − 1.3V) - interfaces directly with transducers, DACs, or battery monitors without level-shifting circuitry. |
Applications
| Threshold Detector | Window Comparator |
|---|---|
|
Use Scenario: Monitoring battery voltage to trigger low-battery warning before system shutdown. IC Role / Device Role / Timing Role: Dual comparator configures one channel as undervoltage detector (INB− tied to REF, INB+ to scaled battery) and second as hysteresis-controlled latch. Use Value: 4µA supply current extends shelf life; internal REF ensures consistent trip point across temperature; HYST pin simplifies hysteresis tuning to prevent chatter near cutoff. |
Use Scenario: Validating regulated 5V supply stays within 4.5V–5.5V window in industrial PLC I/O modules. IC Role / Device Role / Timing Role: MAX933EPA implements active-low undervoltage (OUTA) and overvoltage (OUTB) flags; AND-gated output yields "power-good" signal. Use Value: Shared REF guarantees matched thresholds; dual independent outputs eliminate timing skew between fault signals; 8-pin DIP eases prototyping and field replacement. |
| Oscillator Circuit | Alarm Circuit |
|
Use Scenario: Building low-power relaxation oscillator for LED blink rate control in asset trackers. IC Role / Device Role / Timing Role: One comparator acts as Schmitt trigger with RC network on HYST pin; second comparator buffers or gates output. Use Value: Programmable hysteresis sets precise frequency via R/C values; 40mA source drive powers LED directly; 2.5V minimum supply enables operation from depleted Li-ion cells. |
Use Scenario: Smoke detector with analog sensor output requiring clean on/off decision under EMI-prone conditions. IC Role / Device Role / Timing Role: Comparator compares filtered sensor voltage to REF-derived threshold; HYST pin adds noise margin against RF interference. Use Value: No crowbar current prevents false triggers from supply coupling; rail-to-rail input accommodates sensor's full dynamic range; DIP package supports manual calibration potentiometers. |
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 |
|---|---|---|---|
| MAX933ESA | Same dual-comparator + reference functionality, but in 8-pin SO package with 0°C to +70°C rating. | Not suitable for industrial environments requiring −40°C operation; lower thermal resistance than DIP but less hand-solderable. | Select MAX933ESA only for commercial-temp consumer devices where surface-mount assembly is mandatory and extended temperature is unnecessary. |
| MAX923EPA | Pin-compatible dual comparator with 1% reference (vs. 2%), higher supply current (6µA max), same package and temperature range. | Delivers tighter threshold accuracy for precision measurement; trades 50% higher quiescent current for ±1% REF tolerance. | Choose MAX923EPA when reference accuracy dominates battery life concerns - e.g., medical sensor front-ends requiring <10mV absolute threshold error. |
Compared with MAX933ESA, MAX933EPA offers guaranteed −40°C to +85°C operation and through-hole assembly flexibility, while MAX923EPA provides superior reference accuracy at the cost of higher quiescent current - making MAX933EPA optimal for cost-sensitive, wide-temperature industrial monitoring where 2% reference tolerance is acceptable.
Availability
MAX933EPA is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and alarm circuits requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX933EPA 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 management, sensing, and interface applications, with emphasis on low-power, high-reliability solutions for industrial and automotive markets.
The MAX931–MAX934 family was engineered specifically for micropower comparator applications demanding integrated reference and hysteresis control - targeting portable instrumentation, battery monitoring, and fault-detection systems where board space and energy efficiency are constrained.
FAQ
What is the operating temperature range of the MAX933EPA?
The MAX933EPA is specified for −40°C to +85°C operation, as indicated by the "E" grade suffix in its part number. This industrial temperature range is validated per Maxim's datasheet Absolute Maximum Ratings and Electrical Characteristics tables, ensuring reliable performance in harsh environments such as factory automation controllers or outdoor sensor nodes where ambient temperatures fluctuate widely. The MAX933EPA maintains ≤4µA supply current and 1.182V ±2.5% reference accuracy across this full range.
Does the MAX933EPA require external bypass capacitors?
No, the MAX933EPA does not require external power-supply bypass capacitors under low-impedance supply conditions, as stated in the Board Layout and Bypassing section of its datasheet. However, a 100nF ceramic capacitor is recommended when supply impedance is high or supply leads are long to suppress high-frequency noise. Critically, the REF pin must never be bypassed - doing so degrades reference stability and increases noise, as confirmed by Maxim's noise considerations guidance.
How is hysteresis implemented on the MAX933EPA?
Hysteresis on the MAX933EPA is implemented via the HYST pin (Pin 6), which accepts a voltage between REF − 50mV and REF. Connecting two resistors - R1 from REF to HYST and R2 from HYST to V− - sets the hysteresis band (VHB) ≈ 2 × (REF − VHYST). This method avoids external feedback loops, eliminates layout sensitivity, and applies identical hysteresis to both comparators. The MAX933EPA datasheet provides exact equations and design examples for calculating R1 and R2 based on desired VHB.
Can the MAX933EPA operate from a 3V supply?
Yes, the MAX933EPA operates from +2.5V to +11V single supply, including 3V nominal systems. At 3V, its supply current remains ≤4µA, input common-mode range extends from V− to V+ − 1.3V (i.e., −0.3V to 1.7V when V− = GND), and propagation delay increases to 14µs typical (per 3V Electrical Characteristics table). The internal 1.182V reference remains functional, enabling accurate thresholding even at reduced supply voltages typical of Li-ion or coin-cell powered devices.
Is the MAX933EPA pin-compatible with any other Maxim comparators?
Yes, the MAX933EPA is pin-compatible with the MAX923EPA, as explicitly stated in the datasheet: "The MAX933 and MAX923 are pin-compatible." Both share identical 8-pin DIP pinout, supply ranges, and functional block diagram. This allows direct substitution when upgrading from 2% to 1% reference accuracy - though MAX923EPA draws higher quiescent current (6µA max) and requires validation of reference-driven threshold tolerances in the target application.
MAX933EPA 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):
- 0.015mA @ 5V
- Current - Output (Typ):
- 6µA
- 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
MAX933EPA FAQ
1.How can I place an order for MAX933EPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX933EPA 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 MAX933EPA reliable?
The price and inventory of MAX933EPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX933EPA is usually 5 days.
3.What payment methods are accepted for MAX933EPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX933EPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX933EPA?
MAX933EPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX933EPA 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 MAX933EPA?
For technical support, including MAX933EPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX933EPA requirements.
6.How does Aetrix verify that MAX933EPA is sourced from the original manufacturer or authorized distributors?
All MAX933EPA 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 MAX933EPA meets industry standards.
7.What is the process for return or replacement of MAX933EPA?
All MAX933EPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX933EPA, 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 MAX933EPA part is unused and in its original packaging.
Return procedure for MAX933EPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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