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Microchip Technology TC7662AMJA
- Part No.:
- TC7662AMJA
- Manufacturer:
- Microchip Technology
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
TC7662AMJA.pdf
- Description:
- IC REG CHG PUMP INV 40MA 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,252
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Product details
Overview
TC7662AMJA from Microchip Technology is a high-reliability charge pump DC-DC converter IC that inverts +3V to +18V input to -3V to -18V output using only two external capacitors-no inductors required. It delivers up to 40mA output current, features 12kHz nominal oscillator frequency (adjustable via OSC pin), and exhibits 40Ω typical output source resistance at 20mA load. Designed for extreme-temperature aerospace and military systems, it operates across -55°C to +125°C.
For engineers reviewing the TC7662AMJA datasheet, TC7662AMJA pinout, TC7662AMJA application, or TC7662AMJA equivalent, this page provides verified functional specifications, validated pin functions, temperature-rated package details, and real-world design context for negative voltage generation in harsh-environment embedded systems.
Technical Context
The TC7662AMJA implements a four-switch MOSFET charge pump topology controlled by an internal oscillator and flip-flop-driven level shifters. Its switching action alternates between charging CP to VDD and transferring inverted charge to CR, enabling efficient voltage inversion without magnetic components.
Pin 7 (OSC) allows external capacitor-based oscillator frequency tuning-from nominal 12kHz down to ~2kHz-enabling trade-offs between switching loss and capacitor impedance. Output impedance is determined by MOSFET ON-resistance (RSW), switching frequency, CP/CR values, and capacitor ESR, with typical RO = 46Ω + 20Ω + 5×ESRCR at 12kHz/10μF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +3V to +18V - supports wide-supply industrial and avionics rails without pre-regulation |
| Output Current | Up to 40mA - sufficient for biasing op-amps, ADC references, and RS-232 transceivers |
| Oscillator Frequency | 12kHz nominal (adjustable via OSC pin) - balances efficiency and capacitor size in space-constrained designs |
| Output Source Resistance | 40Ω typ. @ IL = 20mA, VDD = 15V - defines voltage droop under load; lower than TC7660's ~100Ω |
| Operating Temperature | -55°C to +125°C - qualified for extended-range military, downhole, and engine-control applications |
| Package Type | 8-Pin CERDIP - hermetically sealed ceramic package with 90°C/W θJA for high-reliability thermal management |
| Power Efficiency | 93–97% @ VDD = 15V, RL = 2kΩ - minimizes heat rise in sealed enclosures |
Pinout & Package
TC7662AMJA is housed in an 8-pin CERDIP (Ceramic Dual In-line Package) with hermetic sealing and gold-plated leads, rated for -55°C to +125°C operation and 800mW power dissipation. The package uses standard DIP pin spacing (0.300" width) and is compatible with through-hole assembly and high-reliability soldering profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - must remain unconnected; floating or grounded per layout best practice |
| 2 | C+ | Positive terminal of pump capacitor CP - connects to + lead of polarized electrolytic or tantalum capacitor |
| 3 | GND | Ground reference for all internal circuitry and external capacitors - requires low-impedance PCB plane |
| 4 | C− | Negative terminal of pump capacitor CP - connects to − lead of CP; polarity critical for proper charge transfer |
| 5 | VOUT | Inverted output voltage rail (−VDD to −18V) - feeds load directly; output impedance impacts regulation under dynamic load |
| 6 | NC | No internal connection - must remain unconnected; no routing or stitching allowed |
| 7 | OSC | Oscillator control node - adding external capacitor to GND reduces frequency; enables optimization for low-IQ or low-ripple operation |
| 8 | VDD | Positive supply input - accepts 3–18V; requires local 2.2μF bypass if source impedance >25Ω to limit dV/dt |
Key Features
| Feature | Design Value |
|---|---|
| No external diodes required | Integrated MOSFET switch array eliminates discrete diode losses, board area, and reverse leakage path |
| Pin-compatible upgrade to TC7660 | Direct drop-in replacement for legacy TC7660 designs - same footprint, pinout, and basic application circuit |
| Wide input range (3–18V) | Eliminates need for input pre-regulators in battery-powered or variable-voltage systems (e.g., 12V automotive, 5V/15V industrial) |
| Low output impedance | 40Ω typical at 20mA enables stable ±5V or ±12V rails for precision analog circuitry without post-regulation |
| CMOS construction | Ensures low quiescent current (≤700μA), high noise immunity, and compatibility with digital control interfaces |
Applications
| Aerospace Power Conditioning | Military Data Acquisition Systems |
|---|---|
Use Scenario: Generating -12V bias for op-amps and ADC drivers in satellite payload telemetry modules operating at -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Primary negative voltage source; operates as standalone inverting converter with 10μF/10μF capacitor network. Use Value: Enables single-supply microcontroller systems to interface with bipolar analog front-ends without external regulators or magnetics. |
Use Scenario: Providing isolated -5V rail for RS-232 transceivers in ruggedized handheld radios deployed in desert environments. IC Role / Device Role / Timing Role: Negative voltage generator; leverages OSC pin tuning to reduce EMI in RF-sensitive zones. Use Value: Eliminates inductor-induced radiated emissions while maintaining full -55°C to +125°C operational margin. |
| Downhole Instrumentation | Engine Control Unit Sensors |
Use Scenario: Supplying -10V reference to piezoelectric pressure sensors in oil/gas well logging tools exposed to 150°C downhole temperatures. IC Role / Device Role / Timing Role: High-temp inverting converter; uses CERDIP package and derated 40mA output for long-term reliability. Use Value: Delivers stable negative bias where conventional regulators fail due to thermal stress or packaging limitations. |
Use Scenario: Generating -7.5V for knock sensor signal conditioning circuits mounted directly on internal combustion engines. IC Role / Device Role / Timing Role: Compact negative rail generator; integrated low-ESR switching avoids thermal runaway in confined spaces. Use Value: Replaces bulkier transformer-based solutions, reducing weight and vibration sensitivity in ECU assemblies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge pump inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC7662AEPA | Same die, 8-pin PDIP package; θJA = 140°C/W vs. 90°C/W for MJA; max temp = -40°C to +85°C | Limited to commercial/industrial ambient; unsuitable for extended-temperature or hermetic requirements | Select TC7662AEPA only for cost-sensitive non-military designs where thermal headroom exceeds 140°C/W limits. |
| LTC1044CSW | SO-16 package; fixed 10kHz oscillator; 20mA max output; no OSC pin adjustment; higher quiescent current (~1.2mA) | Lower output drive and fixed frequency restrict use in high-current or low-EMI applications | Choose LTC1044CSW when board space is constrained and 20mA output suffices-avoid for MJA's -55°C to +125°C use cases. |
Compared with TC7662AEPA and LTC1044CSW, the TC7662AMJA uniquely combines hermetic CERDIP packaging, -55°C to +125°C operation, 40mA drive, and adjustable oscillator-making it the sole option for mission-critical negative voltage conversion in extreme thermal environments.
Availability
TC7662AMJA is available at Aetrix Electronics and suitable for aerospace power conditioning, military data acquisition systems, and downhole instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TC7662AMJA 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
Microchip Technology Inc. is a leading provider of microcontrollers, analog devices, and timing solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The TC7662A product line was developed specifically for high-reliability, inductorless DC-DC voltage inversion in harsh-environment applications-including aerospace, defense, and industrial control-where size, EMI, and thermal resilience are critical constraints.
FAQ
What is the maximum output current specification for the TC7662AMJA?
The TC7662AMJA is rated for up to 40mA output current under specified conditions (VDD = 15V, TA = +25°C). At -55°C to +125°C, output capability is derated per thermal limits; actual deliverable current depends on PCB copper area, ambient temperature, and capacitor ESR. The TC7662AMJA datasheet specifies 40mA as the absolute maximum continuous output, with 20mA being the condition used for guaranteed 40Ω output resistance measurement.
Does the TC7662AMJA require external diodes for operation?
No, the TC7662AMJA does not require external diodes. It integrates four MOSFET switches and control logic to implement the charge pump function internally. Unlike earlier charge pump ICs such as the ICL7662, the TC7662AMJA eliminates the need for external diodes-reducing component count, board area, forward voltage drop, and reverse leakage current in the signal path.
How does the OSC pin (Pin 7) affect TC7662AMJA performance?
The OSC pin on the TC7662AMJA allows external capacitor-based adjustment of the internal oscillator frequency. Adding capacitance from Pin 7 to GND lowers frequency from the nominal 12kHz-e.g., 100pF reduces it to ~2kHz. This reduces switching losses at light loads but increases capacitor impedance; designers must scale CP and CR inversely to maintain output impedance and ripple performance. The TC7662AMJA's OSC pin enables precise EMI and efficiency tuning without changing the IC itself.
Is the TC7662AMJA pin-compatible with the TC7660?
Yes, the TC7662AMJA is explicitly designed as a pin-compatible upgrade to the TC7660. Both share identical 8-pin DIP/CERDIP pinouts, functional assignments (VDD, GND, VOUT, C+, C−, NC, NC, OSC), and basic application schematics. However, the TC7662AMJA extends input range (3–18V vs. 1.5–10V), doubles output current (40mA vs. 20mA), and adds OSC frequency adjustability-making it a direct functional replacement with enhanced specs.
What is the significance of the 'M' suffix in TC7662AMJA?
The 'M' suffix in TC7662AMJA denotes Microchip's highest-grade temperature qualification: -55°C to +125°C operating range. Combined with the 'J' (CERDIP package) and 'A' (standard speed grade), the TC7662AMJA is certified for extended-temperature military and aerospace applications. This contrasts with 'C' (0°C to +70°C), 'I' (-25°C to +85°C), and 'E' (-40°C to +85°C) variants-making the TC7662AMJA the only version qualified for full MIL-STD-883-level thermal extremes.
TC7662AMJA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 40mA
- Frequency - Switching:
- 12kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
TC7662AMJA FAQ
1.How can I place an order for TC7662AMJA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC7662AMJA 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 TC7662AMJA reliable?
The price and inventory of TC7662AMJA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC7662AMJA is usually 5 days.
3.What payment methods are accepted for TC7662AMJA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC7662AMJA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC7662AMJA?
TC7662AMJA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC7662AMJA 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 TC7662AMJA?
For technical support, including TC7662AMJA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC7662AMJA requirements.
6.How does Aetrix verify that TC7662AMJA is sourced from the original manufacturer or authorized distributors?
All TC7662AMJA 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 TC7662AMJA meets industry standards.
7.What is the process for return or replacement of TC7662AMJA?
All TC7662AMJA units undergo pre-shipment inspection (PSI). If there is an issue with TC7662AMJA, 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 TC7662AMJA part is unused and in its original packaging.
Return procedure for TC7662AMJA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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