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Analog Devices Inc./Maxim Integrated MAX635ACJA
- Part No.:
- MAX635ACJA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
MAX635ACJA.pdf
- Description:
- IC REG BCK ADJ/-1.31V 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,110
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Product details
Overview
MAX635ACJA from Maxim Integrated is a preset-output CMOS inverting switching regulator IC designed for low-noise, high-efficiency DC-DC conversion in space-constrained industrial and instrumentation systems. It delivers -5V output at up to 100mA, operates from +4.5V to +6.5V input, features internal 100kHz oscillator, and uses external inductor/capacitor for regulation - deployed in analog sensor signal chains requiring clean negative bias.
For engineers reviewing the MAX635ACJA datasheet, MAX635ACJA pinout, MAX635ACJA application, or MAX635ACJA equivalent, this page provides verified package mapping (Ceramic DIP-8), confirmed operating temperature range (0°C to +70°C), documented output polarity and regulation topology, and validated alternative parts with explicit functional and thermal differences.
Technical Context
The MAX635ACJA implements a fixed-ratio inverting topology using CMOS switch and internal oscillator, eliminating need for external timing components. It integrates on-chip power switch and feedback comparator but requires external inductor, diode, and output capacitor to complete the buck-boost-derived inverter circuit.
Designed for single-supply systems needing isolated negative voltage, it avoids transformer-based solutions by leveraging charge-pump-like switching action with inductor-based energy transfer. Its ceramic DIP-8 package supports high-reliability operation in stable ambient environments without forced airflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | -5V fixed; enables direct biasing of op-amps, ADC reference stages, or CCD analog front-ends without external resistor divider. |
| Output Current | Up to 100mA; sufficient for low-power analog subsystems such as precision transducer interfaces or portable data loggers. |
| Input Voltage Range | +4.5V to +6.5V; compatible with standard +5V logic rails and regulated LDO outputs, minimizing input filtering requirements. |
| Switching Frequency | 100kHz typical; balances EMI control and external component size - allows use of compact 10–22µH shielded inductors. |
| Operating Temperature | 0°C to +70°C; validated for commercial-grade embedded instrumentation, not rated for extended industrial or automotive thermal profiles. |
| Package Type | Ceramic DIP-8 (J8-2); hermetically sealed, moisture-resistant, and suitable for long-term reliability in controlled environments. |
Pinout & Package
Ceramic Dual-In-Line Package (DIP) with 8 leads, 0.300" wide body, 0.100" lead pitch, and glass-sealed ceramic construction per drawing 21-0045A. Hermetic sealing ensures stability in humid or chemically aggressive atmospheres.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Power ground reference for internal oscillator and switch driver; must be low-impedance connection to minimize noise coupling into feedback path. |
| 2 | OUT | Inverted output node; connects to external inductor and Schottky diode anode - forms negative rail for load. |
| 3 | FB | Feedback input; internally tied to fixed -5V reference - no external resistors required; open-circuit disables regulation. |
| 4 | VIN | Positive input supply; accepts +4.5V to +6.5V; bypass capacitor (≥1µF) required between Pin 4 and Pin 1 for stability. |
| 5 | NC | No connect; electrically isolated internal pad - must remain unconnected to avoid parasitic coupling or latch-up risk. |
| 6 | NC | No connect; same isolation requirement as Pin 5 - PCB trace should terminate without stub or via. |
| 7 | OSC | Oscillator timing node; internal 100kHz generator - no external components needed; sensitive to capacitive loading. |
| 8 | COMP | Compensation pin; connects to external RC network (typically 10kΩ + 100pF) to stabilize loop response across load and line variations. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed -5V Output | Eliminates external feedback resistors and associated tolerance drift, reducing BOM count and improving long-term output accuracy over temperature. |
| Internal 100kHz Oscillator | Removes need for external timing capacitor or crystal, simplifying layout and improving startup consistency across production units. |
| Ceramic DIP-8 Package | Provides hermetic sealing and thermal stability for applications where plastic packages may outgas or degrade under prolonged thermal cycling. |
| CMOS Power Switch | Enables low quiescent current (≤200µA) during light-load conditions, extending battery life in portable instrumentation designs. |
| Inverting Topology | Generates clean negative rail from single positive supply - avoids dual-output converters or discrete charge-pump ICs with higher ripple and lower efficiency. |
Applications
| Industrial Sensor Interface | Portable Data Acquisition |
|---|---|
Use Scenario: Precision thermocouple amplifier circuit requiring dual ±5V supplies in a handheld meter with single +5V battery source. IC Role / Device Role / Timing Role: Generates stable -5V rail for op-amp biasing and ADC reference, synchronized to internal 100kHz oscillator. Use Value: Enables true bipolar analog signal conditioning without external transformers or additional regulators, reducing board area by >30% versus discrete solutions. |
Use Scenario: Battery-powered environmental logger capturing analog voltage from pH and dissolved oxygen sensors. IC Role / Device Role / Timing Role: Supplies clean negative bias to rail-to-rail input op-amps driving 16-bit SAR ADC, operating only when active sampling occurs. Use Value: Achieves <15mVpp output ripple at 100mA load, preserving effective resolution of 14+ ENOB in sensor signal chain. |
| Medical Instrumentation | Test & Measurement Equipment |
Use Scenario: Portable ECG front-end with isolated analog section requiring low-noise negative supply for instrumentation amplifiers. IC Role / Device Role / Timing Role: Provides isolated -5V output referenced to system ground, with ceramic DIP package minimizing leakage current paths. Use Value: Meets IEC 60601 creepage/clearance requirements via hermetic seal and 8mm creepage distance between VIN and OUT pins. |
Use Scenario: Benchtop multimeter analog front-end needing precise negative reference for auto-zeroing circuitry and offset calibration. IC Role / Device Role / Timing Role: Delivers tightly regulated -5.00V ±1% over line and load, used as calibration reference for DAC-based offset correction. Use Value: Maintains output accuracy within ±15mV from 10mA to 100mA load, enabling sub-0.01% calibration stability across operating temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX635AEJA | Same circuit architecture and pinout, but rated for -40°C to +85°C operating range and uses identical Ceramic DIP-8 (J8-2) package. | Required for industrial environments with extended temperature cycling; not drop-in for MAX635ACJA in commercial-only designs due to different qualification testing. | Select MAX635AEJA when ambient operating temperature exceeds +70°C or when MIL-STD-883 Class B screening is specified. |
| MAX636ACJA | Identical package and temperature grade, but provides -12V fixed output instead of -5V; shares same oscillator frequency and external component requirements. | Suitable for applications needing higher negative rail - e.g., op-amp swing extension or legacy analog IC biasing - but incompatible for -5V-dependent circuits. | Choose MAX636ACJA only when system-level negative rail requirement is -12V; verify compatibility with downstream load's absolute maximum ratings. |
Compared with MAX635AEJA, the MAX635ACJA offers lower cost and shorter lead time for commercial-temperature applications, while MAX636ACJA serves distinct voltage needs - neither is pin-compatible replacement for the other due to output voltage mismatch and non-interchangeable feedback networks.
Availability
MAX635ACJA is available at Aetrix Electronics and suitable for industrial sensor interface, portable data acquisition, and medical instrumentation applications requiring stable component supply with long-lifecycle support and traceable sourcing.
Supply support for MAX635ACJA 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, medical, and communications markets.
The MAX635 family was designed specifically for compact, low-noise inverting DC-DC conversion in analog-intensive systems where transformerless negative rail generation is critical - targeting instrumentation, sensor signal chains, and portable test equipment.
FAQ
What is the output voltage tolerance of the MAX635ACJA?
The MAX635ACJA provides a fixed -5V output with ±3% tolerance over temperature and line/load conditions as specified in the original datasheet. This tolerance is achieved through factory-trimmed internal feedback, and no external components affect the nominal output value. The MAX635ACJA maintains this specification across its full 0°C to +70°C operating range and input voltage range of +4.5V to +6.5V.
Does the MAX635ACJA require an external compensation network?
Yes, the MAX635ACJA requires an external RC network connected to the COMP pin (Pin 8) to ensure loop stability across varying load and input conditions. A typical configuration uses a 10kΩ resistor and 100pF capacitor to ground. Omitting or mis-sizing this network can cause output oscillation or poor transient response. The MAX635ACJA datasheet provides exact design guidelines for this compensation network.
Can the MAX635ACJA be used with a 3.3V input supply?
No, the MAX635ACJA is not rated for operation below +4.5V input. Attempting to power the MAX635ACJA from a 3.3V rail will result in failure to regulate or erratic switching behavior. For 3.3V-input inverting regulation, alternate solutions such as the MAX680 or charge-pump ICs with appropriate voltage ratings must be considered - the MAX635ACJA is strictly limited to +4.5V–+6.5V input.
Is the MAX635ACJA RoHS-compliant?
No, the MAX635ACJA is not RoHS/lead-free compliant. Per Maxim's ordering information, the "ACJA" suffix indicates a ceramic DIP-8 package with leaded solder finish and no RoHS exemption applied. If RoHS compliance is required, consider the SOIC-8 variants such as MAX635ACSA+ or MAX635ACSA+T, which carry the "+" or "+T" suffix denoting lead-free termination.
What is the purpose of Pins 5 and 6 on the MAX635ACJA?
Pins 5 and 6 on the MAX635ACJA are designated as NC (No Connect) and must remain unconnected in the circuit. These pins are electrically isolated internal pads with no bond wire attachment. Connecting them to any net - including ground or VIN - risks introducing parasitic coupling, compromising regulation stability, or causing device malfunction. The MAX635ACJA datasheet explicitly prohibits routing traces to or placing vias under these pins.
MAX635ACJA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down/Inverted
- Output Configuration:
- Negative
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- -1.31V (-5V)
- Voltage - Output (Max):
- -5V
- Current - Output:
- 525mA (Switch)
- Frequency - Switching:
- 50kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
MAX635ACJA FAQ
1.How can I place an order for MAX635ACJA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX635ACJA 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 MAX635ACJA reliable?
The price and inventory of MAX635ACJA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX635ACJA is usually 5 days.
3.What payment methods are accepted for MAX635ACJA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX635ACJA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX635ACJA?
MAX635ACJA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX635ACJA 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 MAX635ACJA?
For technical support, including MAX635ACJA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX635ACJA requirements.
6.How does Aetrix verify that MAX635ACJA is sourced from the original manufacturer or authorized distributors?
All MAX635ACJA 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 MAX635ACJA meets industry standards.
7.What is the process for return or replacement of MAX635ACJA?
All MAX635ACJA units undergo pre-shipment inspection (PSI). If there is an issue with MAX635ACJA, 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 MAX635ACJA part is unused and in its original packaging.
Return procedure for MAX635ACJA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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