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Analog Devices Inc. AD8479TRZ-EP-R7
- Part No.:
- AD8479TRZ-EP-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8479TRZ-EP-R7.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,240
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Product details
Overview
AD8479TRZ-EP-R7 from Analog Devices is a precision difference amplifier engineered for high-voltage current sensing and motor control applications where differential signals must be measured accurately in the presence of ±600 V dc common-mode voltage. It delivers fixed gain of 1, rail-to-rail output swing, 130 kHz small-signal bandwidth, and operates across ±2.5 V to ±18 V supplies with only 550 µA typical supply current.
For engineers reviewing the AD8479TRZ-EP-R7 datasheet, AD8479TRZ-EP-R7 pinout, AD8479TRZ-EP-R7 application, or AD8479TRZ-EP-R7 equivalent, this page provides verified technical context, validated pin functions, confirmed military-grade temperature performance (−55°C to +125°C), and real-world alternative part comparisons for avionics, unmanned systems, and industrial high-voltage monitoring designs.
Technical Context
The AD8479TRZ-EP-R7 implements a fully differential input architecture with matched internal resistors enabling precise rejection of common-mode transients up to ±600 V. Its input impedance is 2 MΩ differential and 500 kΩ common-mode, supporting direct connection to shunt-based current sensing without external attenuation.
It features low-drift performance: 15 µV/°C max offset drift, 5 ppm/°C max gain drift, and maintains ≥80 dB CMRR over −55°C to +125°C and up to 12 kHz at 1200 V p-p common-mode. The device uses no internal amplification beyond unity gain, eliminating gain-dependent error sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 1 V/V - eliminates gain-setting resistor errors and enables direct voltage translation of differential inputs. |
| Common-Mode Range | ±600 V dc - supports direct measurement across high-side shunts in 400 V–800 V bus systems without isolation. |
| CMRR | ≥80 dB at ±600 V and −55°C to +125°C - ensures stable accuracy under extreme voltage and thermal stress. |
| Bandwidth | 130 kHz −3 dB - sufficient for PWM-based motor current feedback and fast transient detection in servo drives. |
| Offset Drift | ≤15 µV/°C - limits total offset shift to <1.8 mV over full military temperature range, critical for uncalibrated systems. |
| Supply Current | 550 µA typical - enables low-power operation in always-on monitoring circuits with minimal self-heating. |
| Output Swing | Rail-to-rail (−VS + 0.3 V to +VS − 0.3 V) - maximizes dynamic range into ADCs or comparators powered from same rails. |
Pinout & Package
AD8479TRZ-EP-R7 is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm pitch and narrow body profile suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: REF(−) | Negative reference input | Accepts ground or negative bias reference; sets output common-mode level when used differentially with REF(+). |
| 2: −IN | Inverting input | High-impedance node for one side of differential input; matched to +IN for CMRR integrity. |
| 3: +IN | Noninverting input | High-impedance node for opposite side of differential input; internal 1 MΩ termination to REF(−) and REF(+). |
| 4: −VS | Negative supply rail | Connects to negative power supply; supports operation down to ±2.5 V total supply. |
| 5: REF(+) | Positive reference input | Accepts ground or positive bias reference; used with REF(−) to define output common-mode voltage. |
| 6: OUTPUT | Differential output | Rail-to-rail analog output; drives 2 kΩ loads directly; stable with ≤500 pF capacitive load. |
| 7: +VS | Positive supply rail | Connects to positive power supply; decoupling recommended within 1 cm of pin. |
| 8: NC | No connect | Internally unconnected; must remain floating - no trace or via allowed. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced Product qualification | Qualified per AQEC standard for defense/aerospace use, including controlled fab/assembly sites and military temperature range (−55°C to +125°C). |
| High common-mode transient immunity | Withstands ±600 V common-mode and differential transients continuously - replaces isolation amplifiers in non-galvanic applications. |
| Low drift performance | 10 ppm max gain nonlinearity and 15 µV/°C max offset drift ensure calibration stability over life and temperature. |
| Wide supply flexibility | Operates from ±2.5 V to ±18 V - compatible with both low-voltage logic interfaces and high-voltage industrial supplies. |
| Stable capacitive drive | Guaranteed stability with up to 500 pF load - simplifies routing to remote ADCs or filters without added compensation. |
Applications
| Avionics Power Monitoring | Unmanned System Motor Control |
|---|---|
Use Scenario: Real-time current monitoring of DC bus in flight control actuators and power distribution units. IC Role / Device Role / Timing Role: Precision difference amplifier measuring shunt voltage across ±400 V bus while rejecting aircraft EMI and lightning-induced transients. Use Value: Enables accurate torque estimation and fault detection without optical isolation, reducing BOM cost and board space by 40% vs. isolated solutions. | Use Scenario: Closed-loop phase current sensing in brushless DC motor inverters for UAV propulsion systems. IC Role / Device Role / Timing Role: High-bandwidth (130 kHz) differential amplifier capturing fast PWM-edge current transients during commutation. Use Value: Delivers <11 µs settling time for 0.01% accuracy, supporting field-oriented control (FOC) algorithms at >20 kHz switching frequencies. |
| Industrial High-Voltage Current Sensing | Isolated Gate Driver Auxiliary Sensing |
Use Scenario: Shunt-based current measurement in 690 V AC variable frequency drives and solar string inverters. IC Role / Device Role / Timing Role: Direct interface between high-side shunt and isolated ADC, operating at ±600 V common-mode with no external level-shifting. Use Value: Eliminates need for discrete resistor dividers or isolated power supplies, improving long-term gain stability and reducing thermal drift errors. | Use Scenario: Auxiliary current feedback for IGBT/SiC gate driver protection circuits in modular multilevel converters. IC Role / Device Role / Timing Role: Fast-response differential amplifier detecting short-circuit events on gate driver output paths before destructive failure. Use Value: 9.3 V/µs slew rate and 100 kHz full-power bandwidth enable sub-microsecond fault detection, improving system reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision high-common-mode difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA149IDR | Fixed gain of 1, ±200 V common-mode range, 200 kHz bandwidth, SO-8 package. | Limited to lower-voltage industrial systems (<300 V bus); lacks military temp rating and AQEC qualification. | Select when cost sensitivity outweighs extended voltage range and aerospace compliance requirements. |
| AMC1301DWVR | Reinforced isolation, ±1 V input range, 7.5 MHz bandwidth, 8-pin SOIC with integrated transformer. | Provides galvanic isolation but requires external ±5 V supply and has lower input voltage range; not drop-in. | Choose only when safety-critical isolation is mandated - AD8479TRZ-EP-R7 avoids isolation overhead where permitted. |
Compared with INA149IDR and AMC1301DWVR, the AD8479TRZ-EP-R7 uniquely combines ±600 V common-mode tolerance, military temperature operation, and AQEC qualification in a non-isolated, unity-gain architecture - making it optimal for high-reliability, high-voltage sensing where isolation adds unnecessary complexity and cost.
Availability
AD8479TRZ-EP-R7 is available at Aetrix Electronics and suitable for avionics power monitoring, unmanned system motor control, and industrial high-voltage current sensing requiring stable component supply, long-lifecycle assurance, and defense-grade traceability.
Supply support for AD8479TRZ-EP-R7 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD8479-EP product line delivers radiation-tolerant, temperature-hardened precision amplifiers for defense, aerospace, and critical infrastructure applications demanding guaranteed performance across −55°C to +125°C.
FAQ
What is the maximum continuous common-mode voltage the AD8479TRZ-EP-R7 can handle?
The AD8479TRZ-EP-R7 supports a continuous common-mode voltage range of ±600 V dc, as specified in its absolute maximum ratings and confirmed in Table 1 of the datasheet. This allows direct connection to high-side shunts in 800 V-class systems. Transient overvoltage tolerance reaches ±900 V for up to 10 seconds, but sustained operation must remain within the ±600 V limit to ensure reliability and specification compliance.
Does the AD8479TRZ-EP-R7 require external gain-setting resistors?
No, the AD8479TRZ-EP-R7 has a fixed gain of 1 V/V implemented with laser-trimmed internal resistors. This eliminates external resistor matching errors, temperature drift, and layout sensitivity. The device outputs a precise replica of the differential input voltage, making it ideal for applications requiring predictable, stable transfer function without calibration.
Can the AD8479TRZ-EP-R7 operate from a single supply?
No, the AD8479TRZ-EP-R7 is designed exclusively for dual-supply operation (±2.5 V to ±18 V). Its input and output stages require symmetrical rails to maintain common-mode headroom and rail-to-rail output swing. Single-supply configurations are not supported, and attempting to bias inputs or outputs outside the specified common-mode range will degrade CMRR and accuracy.
What is the purpose of the NC pin (Pin 8) on the AD8479TRZ-EP-R7?
Pin 8 is designated NC (No Connect) and is internally unconnected. Per the datasheet's Pin Configuration section and Figure 3, it must remain electrically floating - no trace, pad, or via should connect to it. Routing or grounding Pin 8 may compromise internal die isolation, affect thermal performance, or introduce noise coupling, violating the device's qualified AQEC construction.
How does the AD8479TRZ-EP-R7 differ from the commercial-grade AD8479?
The AD8479TRZ-EP-R7 is the Enhanced Product version, qualified to AQEC standards for defense and aerospace use. It features controlled manufacturing baseline, single fab/assembly site, military temperature range (−55°C to +125°C), and full qualification data on request - unlike the commercial AD8479, which is rated only from −40°C to +85°C and lacks traceability and change notification protocols required for mission-critical systems.
AD8479TRZ-EP-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 9V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 130 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 550µA
- Current - Output / Channel:
- 55 mA
- Voltage - Supply Span (Min):
- -
- Voltage - Supply Span (Max):
- -
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD8479TRZ-EP-R7 FAQ
1.How can I place an order for AD8479TRZ-EP-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8479TRZ-EP-R7 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 AD8479TRZ-EP-R7 reliable?
The price and inventory of AD8479TRZ-EP-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8479TRZ-EP-R7 is usually 5 days.
3.What payment methods are accepted for AD8479TRZ-EP-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8479TRZ-EP-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8479TRZ-EP-R7?
AD8479TRZ-EP-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8479TRZ-EP-R7 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 AD8479TRZ-EP-R7?
For technical support, including AD8479TRZ-EP-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8479TRZ-EP-R7 requirements.
6.How does Aetrix verify that AD8479TRZ-EP-R7 is sourced from the original manufacturer or authorized distributors?
All AD8479TRZ-EP-R7 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 AD8479TRZ-EP-R7 meets industry standards.
7.What is the process for return or replacement of AD8479TRZ-EP-R7?
All AD8479TRZ-EP-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8479TRZ-EP-R7, 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 AD8479TRZ-EP-R7 part is unused and in its original packaging.
Return procedure for AD8479TRZ-EP-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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