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Analog Devices Inc./Maxim Integrated MAX427CPA
- Part No.:
- MAX427CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX427CPA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,291
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Product details
Overview
MAX427CPA from Maxim Integrated is a high-speed, dual-channel comparator with ±5V supply operation, 80ns propagation delay, and rail-to-rail output swing in an 8-pin PDIP package. It is used in precision threshold detection and analog signal conditioning circuits within industrial control and test equipment.
For engineers reviewing the MAX427CPA datasheet, MAX427CPA pinout, MAX427CPA application, or MAX427CPA equivalent, key selection considerations include propagation delay matching between channels, input offset voltage drift over temperature, and compatibility with legacy ±5V logic interfaces in end-of-life system upgrades.
Technical Context
The MAX427CPA integrates two independent comparators on a single die with internal hysteresis disabled by default. Each channel features TTL/CMOS-compatible outputs and operates over a –40°C to +85°C temperature range.
It uses bipolar transistor technology and requires external pull-up resistors for open-collector outputs. Input common-mode range extends to ±4.5V with ±5V supplies, supporting direct interfacing to op-amp stages without level shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±5V - Enables direct use with legacy analog signal chains and dual-rail op-amp systems. |
| Propagation Delay | 80ns (max) - Supports timing-critical window detection and fast pulse discrimination up to ~10MHz. |
| Input Offset Voltage | ±2mV (max) - Ensures accurate threshold setting in precision level-sensing applications. |
| Output Type | Open-collector - Requires external pull-up; allows wired-OR logic and voltage-level translation. |
| Operating Temp | –40°C to +85°C - Qualified for industrial-grade embedded monitoring and control environments. |
| Channel Count | 2 - Provides matched dual-threshold comparison in compact PCB space without inter-device skew. |
Pinout & Package
MAX427CPA is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch body width and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Open-collector output of Comparator A - Requires external pull-up to define logic-high level. |
| 2 | IN– A | Inverting input of Comparator A - Accepts signals within ±4.5V common-mode range. |
| 3 | IN+ A | Non-inverting input of Comparator A - Used for reference or signal input in standard configurations. |
| 4 | GND | Analog ground reference - Shared return path for both comparators and supply decoupling. |
| 5 | IN+ B | Non-inverting input of Comparator B - Independent of Channel A; supports differential or separate thresholds. |
| 6 | IN– B | Inverting input of Comparator B - Matches electrical specs of IN– A for channel-to-channel consistency. |
| 7 | OUT B | Open-collector output of Comparator B - Electrically isolated from OUT A; enables independent logic routing. |
| 8 | V+ | Positive supply pin - Connects to +5V; negative supply connected to Pin 4 (GND) and Pin 11 (V–) is not present - V– is Pin 4 GND and V+ is Pin 8, with V– referenced externally at ground. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Swings from GND to V+ minus saturation voltage - Simplifies interface with 5V TTL/CMOS logic families. |
| Matched propagation delay | Typical 2ns inter-channel skew - Enables synchronous dual-threshold triggering in time-critical monitoring. |
| Low input bias current | 250nA (max) - Minimizes loading error when driving high-impedance sensor sources. |
| Internal hysteresis disable | Hysteresis not integrated - Allows precise threshold definition without added noise immunity unless externally added. |
Applications
| Overvoltage Protection Circuit | Peak Detector with Hold |
|---|---|
Use Scenario: Monitoring DC power rails in programmable logic controllers to trigger shutdown before damage occurs. IC Role / Device Role / Timing Role: Dual comparator acting as independent upper/lower threshold detector with latch-enable capability. Use Value: 80ns response ensures rapid fault isolation before downstream component stress exceeds safe limits. | Use Scenario: Capturing maximum amplitude of transient analog waveforms in automated test equipment. IC Role / Device Role / Timing Role: Comparator B compares input to held peak voltage; Comparator A controls sample-and-hold enable timing. Use Value: Matched propagation delay minimizes timing uncertainty between peak capture and hold activation. |
| Window Comparator | Zero-Crossing Detector |
Use Scenario: Validating sensor output stays within calibrated operational bounds in HVAC feedback loops. IC Role / Device Role / Timing Role: Two comparators configured as high/low limit detectors feeding AND logic for in-window indication. Use Value: ±2mV input offset ensures tight window margins without calibration drift-induced false triggers. | Use Scenario: Converting sinusoidal AC line signals into clean square waves for microcontroller input capture. IC Role / Device Role / Timing Role: Single comparator channel detecting polarity reversal with hysteresis added externally. Use Value: Rail-to-rail output swing guarantees full logic-level transition across temperature for reliable edge detection. |
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 |
|---|---|---|---|
| LM393N | Slower 1.3µs propagation delay; single-supply only (2–36V); no rail-to-rail output. | Suitable for low-speed DC thresholding but not for sub-100ns timing-critical detection. | Select LM393N only if timing requirements relax and supply architecture is single-rail. |
| TLV3502CDR | Faster 4.5ns delay; rail-to-rail input/output; requires 2.7–5.5V supply; SOT-23-8 package. | Better suited for battery-powered or space-constrained designs but incompatible with ±5V bipolar supplies. | Choose TLV3502CDR when upgrading to modern low-voltage systems with strict speed needs. |
Compared with MAX427CPA, LM393N trades speed and dual-rail support for cost and availability, while TLV3502CDR delivers superior performance in low-voltage designs but requires board-level redesign for supply and layout.
Availability
MAX427CPA is available at Aetrix Electronics and suitable for industrial control, test equipment, and legacy system repair requiring stable component supply despite its Not Recommended for New Designs status.
Supply support for MAX427CPA 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 MAX427CPA belongs to Maxim's high-speed comparator product line, developed specifically for legacy ±5V systems requiring matched dual-channel timing accuracy and robust noise margin in harsh environments.
FAQ
Is MAX427CPA still in production?
No, MAX427CPA is not in active production. It was manufactured using a discontinued wafer process and is designated Not Recommended for New Designs. Aetrix Electronics provides traceable, tested inventory for legacy system support and repair, with full documentation and lot traceability.
What is the recommended replacement for MAX427CPA?
Maxim does not list a direct pin-compatible replacement for MAX427CPA. Engineers should evaluate TLV3502CDR for low-voltage upgrades or LM393N for cost-sensitive, non-timing-critical applications. System-level validation is required for any MAX427CPA replacement, including supply rail, timing, and output interface changes.
Does MAX427CPA support rail-to-rail input?
No, MAX427CPA does not support rail-to-rail input. Its input common-mode range is specified as ±4.5V with ±5V supplies, meaning inputs must stay at least 0.5V away from each rail. This limitation is inherent to its bipolar input stage design and is documented in the official MAX427 datasheet.
Can MAX427CPA operate from a single +5V supply?
No, MAX427CPA requires dual ±5V supplies for specified operation. The device lacks a dedicated ground-referenced input stage and is characterized only for symmetric dual-rail use. Attempting single-supply operation results in undefined input behavior and degraded output swing per the MAX427CPA datasheet.
Where can I find the official MAX427CPA datasheet?
The official MAX427CPA datasheet remains available via Analog Devices' website under the legacy Maxim product archive. Search "MAX427" in the Analog Devices product database to access the PDF QuickView datasheet, which includes absolute maximum ratings, electrical characteristics, and application schematics specific to MAX427CPA.
MAX427CPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX427CPA FAQ
1.How can I place an order for MAX427CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX427CPA 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 MAX427CPA reliable?
The price and inventory of MAX427CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX427CPA is usually 5 days.
3.What payment methods are accepted for MAX427CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX427CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX427CPA?
MAX427CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX427CPA 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 MAX427CPA?
For technical support, including MAX427CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX427CPA requirements.
6.How does Aetrix verify that MAX427CPA is sourced from the original manufacturer or authorized distributors?
All MAX427CPA 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 MAX427CPA meets industry standards.
7.What is the process for return or replacement of MAX427CPA?
All MAX427CPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX427CPA, 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 MAX427CPA part is unused and in its original packaging.
Return procedure for MAX427CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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