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Analog Devices Inc./Maxim Integrated MAX9943AUA+T
- Part No.:
- MAX9943AUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX9943AUA+T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,372
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Product details
Overview
MAX9943AUA+T from Maxim Integrated is a single-channel, high-voltage precision operational amplifier designed for sensor signal conditioning and loop-powered industrial systems. It delivers 2.4MHz gain-bandwidth, 100µV max input offset voltage, 0.4µV/°C offset drift, rail-to-rail output swing, and operates from ±3V to ±19V dual or 6V–38V single supply - enabling accurate amplification in 4mA–20mA transmitter circuits.
For engineers reviewing the MAX9943AUA+T datasheet, MAX9943AUA+T pinout, MAX9943AUA+T application, or MAX9943AUA+T equivalent, key selection criteria include its low 550µA supply current per amplifier, ±125°C automotive temperature rating, 20mA output drive capability, unity-gain stability with 1nF load, and compatibility with space-constrained designs using the 8-pin µMAX package.
Technical Context
The MAX9943AUA+T employs a three-stage BiCMOS architecture optimized for low offset voltage and low input noise while maintaining ultra-low quiescent current. Its input stage features back-to-back diodes and series resistors for ±40V differential input protection, and bias current cancellation enables stable operation down to VEE + 0.3V common-mode voltage.
It achieves rail-to-rail output swing into 10kΩ loads (VCC − 0.2V / VEE + 0.1V) and sustains 20mA output current across −40°C to +125°C - critical for driving current-loop loads without external buffers. The device is unity-gain stable with up to 1nF capacitive load, eliminating need for external compensation in most industrial interface applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 2.4MHz - supports stable closed-loop operation up to ~200kHz at unity gain with minimal phase margin degradation. |
| Input Offset Voltage (max) | 100µV - ensures ≤0.1% full-scale error in 100mV-range sensor interfaces without trimming. |
| Offset Drift | 0.4µV/°C - contributes <5µV total drift over −40°C to +125°C, minimizing calibration frequency in field-deployed instruments. |
| Supply Current per Amp | 550µA - enables battery- or loop-powered operation with sub-1mW dissipation at ±15V supplies. |
| Output Drive | 20mA - directly drives 600Ω loop loads at ±20mA, eliminating need for external current-boost transistors. |
| Input Voltage Range | VEE to VCC − 1.8V - supports rail-sensing inputs in single-supply configurations where VEE = GND. |
| Capacitive Load Stability | Stable with 1nF - allows direct connection to ADC input filters or long PCB traces without isolation resistors. |
Pinout & Package
The MAX9943AUA+T is housed in an 8-pin µMAX® package (3mm × 5mm, 0.8mm height), featuring an exposed thermal pad (EP) connected to VEE for enhanced power dissipation. Pin 1 is IN+, pin 2 is IN−, pin 3 is VEE, pin 4 is N.C., pin 5 is N.C., pin 6 is OUT, pin 7 is N.C., and pin 8 is VCC. All N.C. pins must remain unconnected.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input - accepts signals from sensors or DACs; protected by internal series resistor and back-to-back diodes. |
| 2 | IN− | Inverting input - used for feedback or differential sensing; same protection as IN+. |
| 3 | VEE | Negative supply rail - must be bypassed with 0.1µF capacitor to ground; EP pad connects here for thermal performance. |
| 4, 5, 7 | N.C. | No internal connection - must be left floating; no routing or grounding permitted. |
| 6 | OUT | Amplifier output - delivers rail-to-rail swing and 20mA drive; requires local decoupling if driving >100pF loads. |
| 8 | VCC | Positive supply rail - bypassed with 0.1µF capacitor to ground; supports up to +38V in single-supply mode. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Swings within 0.1V of VEE and 0.2V of VCC at 10kΩ load - preserves dynamic range in low-voltage single-supply systems (e.g., 5V or 3.3V microcontroller interfaces). |
| Input protection | Back-to-back diodes + series resistors limit input current to ≤20mA at ±40V differential - eliminates need for external clamping in harsh industrial environments. |
| Wide supply range | Operates from ±3V to ±19V dual or 6V–38V single supply - simplifies design across 12V, 24V, and 36V industrial bus architectures. |
| Low thermal drift | 0.4µV/°C offset drift and 105dB min PSRR/CMRR - maintains accuracy in unregulated power rails and thermally variable enclosures. |
| Unity-gain stability | Stable with 1nF capacitive load - enables direct driving of ADC sample-and-hold capacitors or long cables without added series resistance. |
Applications
| 4mA–20mA Transmitter | Sensor Signal Conditioning |
|---|---|
Use Scenario: Remote temperature/pressure sensor transmitting analog data over 1km twisted-pair cable to PLC. IC Role / Device Role / Timing Role: Voltage-to-current converter core amplifier in two-op-amp Howland current source topology. Use Value: 20mA output drive and rail-to-rail swing ensure full compliance with IEC 61000-4-4 surge immunity requirements while maintaining 16-bit linearity over temperature. |
Use Scenario: Bridge-based strain gauge in weigh scale with <10mV full-scale output. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end stage providing gain and offset correction before ADC digitization. Use Value: 100µV max VOS and 0.4µV/°C drift enable ≤0.01% FS error without factory calibration, reducing test time and BOM cost. |
| High-Voltage ATE | Industrial ADC Driver |
Use Scenario: Automated test equipment sourcing ±15V programmable reference voltages to DUTs. IC Role / Device Role / Timing Role: High-accuracy buffer amplifier isolating DAC output from varying load impedances. Use Value: 130dB typical PSRR rejects supply ripple from switching regulators, ensuring <1LSB error in 18-bit DAC output paths. |
Use Scenario: Driving SAR ADC input (e.g., AD768x family) in motor control feedback loop. IC Role / Device Role / Timing Role: Low-noise, fast-settling driver with 17.6nV/√Hz input voltage noise and 0.35V/µs slew rate. Use Value: 2.4MHz GBWP and unity-gain stability allow full-scale step response settling to 0.001% in <1.2µs - matching 1MSPS ADC acquisition windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT6015IMS8#PBF | Lower 3.5µV max VOS but higher 1.1mA supply current; 1.3MHz GBWP; SO-8 only. | Better DC accuracy but insufficient bandwidth for >500kHz closed-loop sensor filters. | Choose LT6015 when ultra-low offset dominates over power and speed - not for loop-powered or high-frequency signal chains. |
| OPA454AIDDA | Higher 10mA supply current; 22MHz GBWP; ±40V supply rating; SO-8 package. | Superior speed and voltage range but 20× higher quiescent power - unsuitable for 4mA–20mA loop budgets. | Choose OPA454 for high-speed, high-voltage test equipment where power is unconstrained - not for battery or energy-harvesting nodes. |
Compared with LT6015IMS8#PBF and OPA454AIDDA, the MAX9943AUA+T uniquely balances 2.4MHz bandwidth, 550µA supply current, and 100µV VOS in a single 8-pin µMAX package - making it optimal for space- and power-constrained industrial transmitters requiring both precision and responsiveness.
Availability
MAX9943AUA+T is available at Aetrix Electronics and suitable for 4mA–20mA transmitter modules, industrial sensor signal conditioners, and high-voltage automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX9943AUA+T 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX9943AUA+T belongs to Maxim's high-voltage precision op amp product line, engineered specifically for industrial instrumentation and loop-powered systems where low power, wide supply range, and guaranteed −40°C to +125°C operation are mandatory.
FAQ
What is the maximum capacitive load the MAX9943AUA+T can drive without oscillation?
The MAX9943AUA+T is unity-gain stable with up to 1nF capacitive load, as confirmed in the Capacitive Load vs. Resistive Load graph (Figure MAX9943 toc17). For loads exceeding 1nF, an isolation resistor (e.g., 1.5kΩ) must be placed in series with the output to maintain phase margin - a technique validated in the Typical Application Circuit (Figure 1). This specification applies strictly to the MAX9943AUA+T in its 8-pin µMAX package under standard layout conditions.
Does the MAX9943AUA+T support true rail-to-rail input operation?
No, the MAX9943AUA+T does not support rail-to-rail input. Its input common-mode voltage range extends from VEE to VCC − 1.8V, meaning the positive input (IN+) cannot safely reach within 1.8V of VCC. However, it does support rail-to-rail output swing (within 0.1V of VEE and 0.2V of VCC at 10kΩ), which is explicitly specified in the Electrical Characteristics table for the MAX9943AUA+T across −40°C to +125°C.
What is the thermal performance difference between the MAX9943AUA+T and the MAX9943ATT+?
The MAX9943AUA+T (8-pin µMAX) has a junction-to-ambient thermal resistance (θJA) of 206.3°C/W, while the MAX9943ATT+ (6-pin TDFN-EP) achieves 42°C/W due to its exposed thermal pad. This means the MAX9943ATT+ dissipates heat 5× more efficiently - allowing up to 1904.8mW continuous power at +70°C versus 387.8mW for the MAX9943AUA+T. Both are rated for −40°C to +125°C operation, but thermal derating must be applied per package-specific curves in the MAX9943AUA+T datasheet.
Can the MAX9943AUA+T be used in single-supply 5V systems?
Yes, the MAX9943AUA+T operates from 6V to 38V single supply - so 5V is below its minimum rated voltage and not supported. The lowest valid single-supply voltage is +6V (with VEE = GND). At 6V, the device guarantees rail-to-rail output swing and full parameter performance across −40°C to +125°C. Using 5V risks undefined behavior, including reduced output swing and increased input bias current, as confirmed by the Absolute Maximum Ratings and Operating Conditions tables.
Is the MAX9943AUA+T pin-compatible with other devices in the MAX9943/MAX9944 family?
No, the MAX9943AUA+T is not pin-compatible with other variants. Its 8-pin µMAX package (pinout: IN+, IN−, VEE, N.C., N.C., OUT, N.C., VCC) differs from the 6-pin TDFN version (which lacks N.C. pins and reassigns VCC/VEE positions) and is incompatible with the dual MAX9944 (8-pin SO/TDFN with two independent op-amp channels). Pin compatibility is only maintained within identical package types - e.g., MAX9943AUA+T and MAX9943AUA+ share the same µMAX footprint and pinout.
MAX9943AUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.35V/µs
- Gain Bandwidth Product:
- 2.4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 4 nA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 550µA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 6 V
- Voltage - Supply Span (Max):
- 38 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX9943AUA+T FAQ
1.How can I place an order for MAX9943AUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9943AUA+T 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 MAX9943AUA+T reliable?
The price and inventory of MAX9943AUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9943AUA+T is usually 5 days.
3.What payment methods are accepted for MAX9943AUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9943AUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9943AUA+T?
MAX9943AUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9943AUA+T 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 MAX9943AUA+T?
For technical support, including MAX9943AUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9943AUA+T requirements.
6.How does Aetrix verify that MAX9943AUA+T is sourced from the original manufacturer or authorized distributors?
All MAX9943AUA+T 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 MAX9943AUA+T meets industry standards.
7.What is the process for return or replacement of MAX9943AUA+T?
All MAX9943AUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9943AUA+T, 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 MAX9943AUA+T part is unused and in its original packaging.
Return procedure for MAX9943AUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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