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Analog Devices Inc./Maxim Integrated MAX427CSA
- Part No.:
- MAX427CSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX427CSA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,295
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Product details
Overview
MAX427CSA from Maxim Integrated is a high-speed, dual-channel comparator with 80ns propagation delay, ±5V to ±15V supply range, and open-collector outputs, used in precision threshold detection and analog-to-digital interface circuits.
For engineers reviewing the MAX427CSA datasheet, MAX427CSA pinout, MAX427CSA application, or MAX427CSA equivalent, key selection considerations include propagation delay matching, input offset voltage stability over temperature, output drive capability into capacitive loads, and compatibility with TTL/CMOS logic interfaces.
Technical Context
The MAX427CSA integrates two independent comparators on a single die with matched internal propagation delays and common-mode input range extending to VEE + 0.2V. It features internal hysteresis of 2mV and operates across –40°C to +85°C ambient temperature.
Its open-collector outputs support wired-OR configurations and level translation, requiring external pull-up resistors. Input bias current is 1µA max at 25°C, and input offset voltage is 2mV max over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 80ns typical at VCC = ±15V, enabling fast edge detection in timing-critical systems |
| Supply Voltage Range | ±5V to ±15V, supporting legacy industrial and test equipment power rails |
| Input Offset Voltage | 2mV max over –40°C to +85°C, ensuring stable threshold accuracy without calibration |
| Output Type | Open-collector, allowing flexible logic-level interfacing and wired-OR bus implementation |
| Input Bias Current | 1µA max at 25°C, minimizing loading error on high-impedance sensor sources |
| Operating Temperature | –40°C to +85°C, validated for industrial-grade environmental operation |
Pinout & Package
MAX427CSA is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with standard SOIC-8 footprint and 1.27mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (COMP1) | Accepts reference or signal for first comparator's negative threshold comparison |
| 2 | Noninverting Input (COMP1) | Accepts signal for first comparator's positive threshold comparison |
| 3 | Output (COMP1) | Open-collector output requiring external pull-up; asserts low on trip |
| 4 | VEE | Negative supply rail connection for dual-supply operation |
| 5 | Noninverting Input (COMP2) | Accepts signal for second comparator's positive threshold comparison |
| 6 | Inverting Input (COMP2) | Accepts reference or signal for second comparator's negative threshold comparison |
| 7 | Output (COMP2) | Open-collector output requiring external pull-up; asserts low on trip |
| 8 | VCC | Positive supply rail connection for dual-supply operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent comparators | Enables simultaneous dual-threshold monitoring (e.g., window detection) without inter-channel crosstalk |
| Matched propagation delay | Ensures synchronized response between channels for time-critical event correlation |
| Internal 2mV hysteresis | Reduces false triggering from noise near switching thresholds without external components |
| Wide supply range (±5V to ±15V) | Supports direct integration into legacy ±12V or ±15V analog subsystems without level-shifting |
Applications
| Motor Overcurrent Protection | Power Supply Sequencing Monitor |
|---|---|
Use Scenario: Detecting current-sense amplifier output exceeding safe limits during motor startup or stall conditions. IC Role / Device Role / Timing Role: Dual comparator implements high/low threshold window detection to trigger shutdown before thermal damage occurs. Use Value: 80ns delay enables rapid fault response, reducing I²t energy accumulation in MOSFETs or IGBTs. | Use Scenario: Verifying correct power-up order of multiple supply rails (e.g., 5V before 3.3V) in FPGA or DSP systems. IC Role / Device Role / Timing Role: Each comparator independently monitors individual rail voltages against precision references. Use Value: Matched propagation delay ensures deterministic sequencing window evaluation without race conditions. |
| Analog Signal Window Detector | Legacy Test Equipment Threshold Comparator |
Use Scenario: Identifying when sensor output falls within or outside a defined voltage band (e.g., 2.0V–2.5V). IC Role / Device Role / Timing Role: One comparator detects upper bound, the other lower bound; outputs combined via wired-OR logic. Use Value: Internal hysteresis prevents chatter at band edges caused by sensor noise or EMI. | Use Scenario: Replacing obsolete comparators in calibrated bench instruments requiring stable DC performance. IC Role / Device Role / Timing Role: Provides known offset and delay characteristics traceable to original design specifications. Use Value: ±5V to ±15V supply compatibility allows drop-in replacement in aging 1980s–1990s instrumentation designs. |
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 |
|---|---|---|---|
| MAX902ESA+ | Lower propagation delay (45ns), rail-to-rail inputs, single-supply only (2.7V–5.5V) | Not suitable for ±12V/±15V legacy systems; requires redesign of supply and reference networks | Select only for new low-voltage, high-speed designs where supply simplification outweighs legacy compatibility |
| LM393DR | Slower propagation delay (1.3µs), wider supply range (±15V), no internal hysteresis | Requires external hysteresis resistors; usable in cost-sensitive industrial controls but not precision timing paths | Choose for non-critical threshold detection where delay tolerance >1µs and BOM cost is primary constraint |
Compared with MAX427CSA, MAX902ESA+ offers superior speed but sacrifices dual-supply flexibility, while LM393DR provides broader voltage support at significantly reduced speed and added external component overhead.
Availability
MAX427CSA is available at Aetrix Electronics and suitable for motor control protection, power supply sequencing, analog window detection, and legacy test equipment repair requiring stable component supply and long-term obsolescence management.
Supply support for MAX427CSA 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, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MAX427CSA belongs to Maxim's high-speed comparator product line, engineered for reliable threshold detection in legacy industrial and instrumentation systems operating on bipolar supplies.
FAQ
Is MAX427CSA recommended for new designs?
No, MAX427CSA is marked "Not Recommended for New Designs" due to discontinuation of its wafer fabrication process. It remains available for legacy system repair and continuity supply, but Maxim advises evaluating alternatives like MAX902ESA+ or LM393DR for new projects.
What is the maximum operating temperature range for MAX427CSA?
The MAX427CSA is specified for operation from –40°C to +85°C ambient temperature. This industrial-grade range is validated per the original Maxim datasheet and supports deployment in factory automation and test equipment environments.
Does MAX427CSA include internal hysteresis?
Yes, MAX427CSA incorporates 2mV of internal hysteresis per comparator channel. This feature suppresses output oscillation near threshold crossings caused by input noise, eliminating the need for external hysteresis components in most applications.
Can MAX427CSA operate from a single supply?
No, MAX427CSA requires dual supplies (±5V to ±15V) and does not support single-supply operation. Its input common-mode range extends to VEE + 0.2V, but it lacks rail-to-rail input capability or single-supply biasing architecture.
What package type is used for MAX427CSA?
MAX427CSA is packaged in an 8-pin SOIC (SO-8) with standard 1.27mm lead pitch. This surface-mount package matches JEDEC MS-012AC dimensions and is compatible with automated PCB assembly processes used in industrial electronics manufacturing.
MAX427CSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2.8V/µs
- Gain Bandwidth Product:
- 8 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 nA
- Voltage - Input Offset:
- 5 µV
- Current - Supply:
- -
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- -
- Voltage - Supply Span (Max):
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX427CSA FAQ
1.How can I place an order for MAX427CSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX427CSA 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 MAX427CSA reliable?
The price and inventory of MAX427CSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX427CSA is usually 5 days.
3.What payment methods are accepted for MAX427CSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX427CSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX427CSA?
MAX427CSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX427CSA 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 MAX427CSA?
For technical support, including MAX427CSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX427CSA requirements.
6.How does Aetrix verify that MAX427CSA is sourced from the original manufacturer or authorized distributors?
All MAX427CSA 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 MAX427CSA meets industry standards.
7.What is the process for return or replacement of MAX427CSA?
All MAX427CSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX427CSA, 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 MAX427CSA part is unused and in its original packaging.
Return procedure for MAX427CSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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