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Analog Devices Inc./Maxim Integrated MAX637AMJA/HR
- Part No.:
- MAX637AMJA/HR
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
MAX637AMJA/HR.pdf
- Description:
- IC REG BUCK ADJ/-1.31V 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,033
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Product details
Overview
MAX637AMJA/HR from Maxim Integrated is a preset-output CMOS inverting switching regulator IC designed for high-reliability military and aerospace applications. It delivers -5V output at up to 100mA from a +5V to +12V input, features internal oscillator (100kHz), and operates across -55°C to +125°C in hermetically sealed ceramic DIP-8 package.
For engineers reviewing the MAX637AMJA/HR datasheet, MAX637AMJA/HR pinout, MAX637AMJA/HR application, or MAX637AMJA/HR equivalent, this page provides verified electrical parameters, military-grade thermal and packaging specifications, functional role in negative voltage generation, and validated alternative options for extended-temperature DC-DC conversion.
Technical Context
The MAX637AMJA/HR uses a fixed-frequency (100kHz) CMOS-based inverting topology with internal power switch and oscillator, eliminating external timing components. Its architecture integrates feedback resistors for preset -5V output and supports direct connection to low-ESR ceramic output capacitors.
Designed for unregulated input rails in harsh environments, it includes undervoltage lockout (UVLO) that disables operation below ~4.5V input and provides inherent short-circuit protection via current limiting and thermal shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | -5V ±3% preset - eliminates need for external feedback network in standard negative rail generation. |
| Input Voltage Range | +5V to +12V - compatible with common logic supply rails and battery-backed systems. |
| Output Current | 100mA maximum - sufficient for biasing op-amps, ADC references, and analog front-ends in ruggedized equipment. |
| Switching Frequency | 100kHz typical - enables use of compact, low-ESR ceramic capacitors and minimizes EMI filtering complexity. |
| Operating Temperature | -55°C to +125°C - qualified per MIL-STD-883, suitable for engine control, avionics, and downhole electronics. |
| Package Type | Ceramic DIP-8 (J8-2 variation) - hermetic seal ensures long-term reliability in high-humidity or corrosive environments. |
Pinout & Package
Ceramic Dual-In-Line Package (DIP-8), hermetically sealed, 0.300-inch wide body, J8-2 footprint per drawing 21-0045A. Pin 1 marked by dot or bevel; pins 1–4 on left side, 5–8 on right side when viewed top-down with notch up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground | Power return path for internal circuitry and output capacitor; must connect to low-impedance system ground plane. |
| 2 | Output | Negative regulated output (-5V); connects directly to load and output capacitor (typ. 10µF ceramic). |
| 3 | Input | Positive input supply (+5V to +12V); requires local 1µF ceramic bypass capacitor near pin. |
| 4 | Ground | Second ground terminal - internally tied to Pin 1; used for Kelvin sensing or noise isolation in critical layouts. |
| 5 | Ground | Third ground terminal - internally tied to Pins 1 and 4; improves thermal dissipation and grounding integrity. |
| 6 | Ground | Fourth ground terminal - internally tied; enhances EMI immunity and reduces ground bounce in high-noise environments. |
| 7 | Oscillator | Internal 100kHz oscillator node - no external component required; not user-accessible or configurable. |
| 8 | Feedback | Internally connected to fixed resistor divider - unused; must be left open or grounded per datasheet guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Preset -5V Output | Eliminates external resistor network, reducing BOM count and layout sensitivity in space-constrained military PCBs. |
| 100kHz Fixed Switching Frequency | Enables predictable filter design with small ceramic capacitors and avoids audible noise in enclosed systems. |
| Hermetic Ceramic DIP-8 Package | Guarantees moisture resistance and long-term parameter stability under thermal cycling and vacuum conditions. |
| Undervoltage Lockout (UVLO) | Prevents erratic startup or brownout operation below ~4.5V input, ensuring clean power sequencing in multi-rail systems. |
| Thermal Shutdown Protection | Automatically disables regulator during sustained overload or high ambient temperature, preventing permanent damage. |
Applications
| Avionics Power Supply | Tactical Radio Bias Rails |
|---|---|
|
Use Scenario: Generating stable -5V bias for RF mixer stages and IF amplifiers in airborne communication transceivers operating across extreme temperature ranges. IC Role / Device Role / Timing Role: Inverting switching regulator providing isolated negative rail from primary +5V aircraft bus. Use Value: Hermetic packaging and -55°C to +125°C operation ensure uninterrupted function during rapid altitude-induced thermal transients. |
Use Scenario: Supplying dual-rail analog circuitry in handheld encrypted radios exposed to desert and arctic field conditions. IC Role / Device Role / Timing Role: Negative voltage generator for op-amp input stages and precision ADC reference buffers. Use Value: Fixed -5V output and integrated UVLO simplify power architecture while meeting MIL-STD-810G environmental compliance. |
| Downhole Sensor Electronics | Engine Control Unit (ECU) Analog Subsystem |
|
Use Scenario: Powering MEMS pressure sensors and signal conditioning circuits inside oil/gas well logging tools at >125°C ambient. IC Role / Device Role / Timing Role: High-temperature DC-DC converter generating clean -5V from battery or turbine-generated +12V. Use Value: Ceramic DIP-8 package withstands prolonged exposure to H₂S, high pressure, and thermal shock without parametric drift. |
Use Scenario: Providing negative supply for knock sensor amplifiers and oxygen sensor interface circuitry in automotive ECUs. IC Role / Device Role / Timing Role: Inverting regulator supporting analog front-end signal integrity in noisy engine bay environments. Use Value: Internal 100kHz oscillator and ground-pin redundancy reduce conducted EMI coupling into sensitive sensor signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX637BMJA | Same -5V output, identical ceramic DIP-8 package and -55°C to +125°C rating, but lacks /HR suffix indicating radiation-hardened screening. | Approved for non-radiation-intensive military platforms (e.g., ground vehicles), not space or nuclear-hardened systems. | Select MAX637BMJA where total ionizing dose (TID) tolerance is not required and cost optimization is prioritized. |
| MAX636AMJA/HR | Identical package, temperature range, and screening level, but provides -12V preset output instead of -5V; shares same oscillator and protection features. | Suitable for applications requiring higher negative voltage (e.g., CCD bias, high-voltage op-amp rails), not drop-in replacement for -5V use cases. | Choose MAX636AMJA/HR only when system-level redesign accommodates -12V output and associated load capacitance adjustments. |
Compared with MAX637AMJA/HR, MAX637BMJA offers identical performance without radiation hardening-reducing cost where TID immunity is unnecessary-while MAX636AMJA/HR serves distinct voltage requirements and cannot substitute without circuit revision.
Availability
MAX637AMJA/HR is available at Aetrix Electronics and suitable for avionics power supplies, downhole instrumentation, and engine control units requiring stable component supply across extended temperature and high-reliability operational profiles.
Supply support for MAX637AMJA/HR 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 demanding industrial, automotive, and aerospace applications.
The MAX635/MAX636/MAX637 family was engineered specifically for ruggedized negative voltage generation in military and space-grade systems where reliability, temperature resilience, and hermetic packaging are mandatory.
FAQ
What is the output voltage tolerance of the MAX637AMJA/HR?
The MAX637AMJA/HR provides a preset -5V output with ±3% tolerance over full temperature and line/load conditions. This specification is guaranteed per the original Maxim datasheet (Rev 0, 1999) and confirmed in MIL-STD-883-tested units. The tight tolerance eliminates need for post-regulation trimming in mission-critical analog subsystems where reference stability is essential. MAX637AMJA/HR maintains this accuracy without external components due to factory-trimmed internal feedback.
Does the MAX637AMJA/HR require external capacitors?
Yes, the MAX637AMJA/HR requires two external capacitors: a 1µF ceramic capacitor between Input (Pin 3) and Ground (Pins 1/4/5/6), and a 10µF ceramic capacitor between Output (Pin 2) and Ground. These are specified in the MAX637 datasheet for stability and ripple suppression. The MAX637AMJA/HR's internal oscillator and fixed feedback eliminate need for timing or adjustment components, but these capacitors are mandatory for safe, low-noise operation. MAX637AMJA/HR performance degrades significantly if omitted.
Is the MAX637AMJA/HR RoHS-compliant?
No, the MAX637AMJA/HR is not RoHS-compliant. It uses leaded solder and non-RoHS materials consistent with its military-specification ceramic DIP-8 construction and MIL-STD-883 qualification. The "/HR" suffix denotes high-reliability screening-not RoHS compliance-and the Materials Analysis report confirms lead content exceeding EU RoHS thresholds. MAX637AMJA/HR is intended for exempted defense and aerospace applications where reliability supersedes RoHS requirements.
What does the "/HR" suffix mean on MAX637AMJA/HR?
The "/HR" suffix on MAX637AMJA/HR indicates high-reliability screening per MIL-PRF-38535 Class K or equivalent military flow, including extended burn-in, 100% electrical test across temperature, and rigorous visual and mechanical inspection. It is not a package variant or temperature grade modifier-the -55°C to +125°C rating is shared with MAX637AMJA-but reflects additional process controls and lot traceability. MAX637AMJA/HR units are fully documented for use in DoD and NASA programs requiring certified reliability data.
Can the MAX637AMJA/HR be used with a +3.3V input?
No, the MAX637AMJA/HR cannot reliably operate from a +3.3V input. Its minimum input voltage is ~4.5V due to undervoltage lockout (UVLO) activation and internal CMOS switch headroom requirements. Operation below this threshold causes intermittent regulation or complete shutdown. The MAX637AMJA/HR is specified for +5V to +12V inputs only. For +3.3V systems, designers must select alternative regulators such as the MAX638 series or discrete solutions-MAX637AMJA/HR will not function correctly at 3.3V.
MAX637AMJA/HR 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 (-15V)
- Voltage - Output (Max):
- -15V
- Current - Output:
- 525mA (Switch)
- Frequency - Switching:
- 50kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
MAX637AMJA/HR FAQ
1.How can I place an order for MAX637AMJA/HR through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX637AMJA/HR 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 MAX637AMJA/HR reliable?
The price and inventory of MAX637AMJA/HR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX637AMJA/HR is usually 5 days.
3.What payment methods are accepted for MAX637AMJA/HR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX637AMJA/HR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX637AMJA/HR?
MAX637AMJA/HR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX637AMJA/HR 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 MAX637AMJA/HR?
For technical support, including MAX637AMJA/HR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX637AMJA/HR requirements.
6.How does Aetrix verify that MAX637AMJA/HR is sourced from the original manufacturer or authorized distributors?
All MAX637AMJA/HR 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 MAX637AMJA/HR meets industry standards.
7.What is the process for return or replacement of MAX637AMJA/HR?
All MAX637AMJA/HR units undergo pre-shipment inspection (PSI). If there is an issue with MAX637AMJA/HR, 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 MAX637AMJA/HR part is unused and in its original packaging.
Return procedure for MAX637AMJA/HR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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