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Analog Devices Inc. AD8421TRMZ-EP
- Part No.:
- AD8421TRMZ-EP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8421TRMZ-EP.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,419
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Product details
Overview
AD8421TRMZ-EP from Analog Devices is an enhanced-product instrumentation amplifier optimized for precision signal conditioning in harsh environments. It delivers 3.2 nV/√Hz input voltage noise, 200 fA/√Hz current noise, 2.3 mA supply current, and operates across −55°C to +125°C - enabling high-fidelity sensor interfacing in aerospace data acquisition systems.
For engineers reviewing the AD8421TRMZ-EP datasheet, AD8421TRMZ-EP pinout, AD8421TRMZ-EP application, or AD8421TRMZ-EP equivalent, key selection considerations include its military-grade temperature range, single-resistor gain setting (G = 1 to 10,000), robust ±40 V input overvoltage protection, and current-feedback architecture sustaining 2 MHz bandwidth at G = 100.
Technical Context
The AD8421TRMZ-EP employs a current-feedback instrumentation amplifier topology that maintains wide bandwidth (10 MHz at G = 1) and fast settling (0.6 µs to 0.001% at G = 100) across gain settings. Its input stage uses ultralow-bias JFET inputs with 2 nA max bias current and 30 GΩ||3 pF input impedance.
It integrates rail-to-rail output swing capability (−VS + 1.2 V to +VS − 1.7 V), reference-input offset control (±VS range, 1 ppm/V gain), and ESD-hardened inputs (2 kV HBM). All specifications are fully characterized from −55°C to +125°C per AQEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 3.2 nV/√Hz at 1 kHz - enables sub-µV-level signal resolution in low-frequency sensor applications. |
| Supply Current | 2.3 mA max - supports low-power operation in battery-backed or thermally constrained systems. |
| CMRR | 124 dB at G = 100, DC–60 Hz - rejects high-amplitude common-mode interference in noisy industrial environments. |
| Bandwidth | 2 MHz at G = 100 - supports accurate amplification of fast transients in vibration monitoring and structural health sensing. |
| Input Overvoltage Protection | ±40 V from opposite supply - eliminates need for external clamping in high-voltage sensor front-ends. |
| Gain Range | 1 to 10,000 via single external resistor - simplifies calibration and field-adjustable gain without redesign. |
| Operating Temperature | −55°C to +125°C - qualified for defense/aerospace deployments requiring extended thermal reliability. |
Pinout & Package
AD8421TRMZ-EP is housed in an 8-lead MSOP (RM-8) package with 0.65 mm pitch, JEDEC MO-187-AA compliant, and 138.6°C/W θJA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative Input Terminal | Differential input node; accepts signals up to ±40 V from opposite supply without damage. |
| 2, 3 (RG) | Gain Setting Terminals | Resistor connection points; gain = 1 + (9.9 kΩ / RG); sets full-scale range without trimming. |
| 4 (+IN) | Positive Input Terminal | Differential input node; matched to −IN for >124 dB CMRR at G = 100. |
| 5 (−VS) | Negative Power Supply | Accepts dual supplies from ±2.5 V to ±18 V or single supply from 5 V to 36 V. |
| 6 (REF) | Reference Input | Drives output offset with low-impedance source; gain to output is 1 ± 0.0001 V/V. |
| 7 (VOUT) | Amplified Output | Delivers rail-to-rail swing (−VS + 1.2 V to +VS − 1.7 V) into 2 kΩ load. |
| 8 (+VS) | Positive Power Supply | Supports symmetric or asymmetric supply configurations; powers internal bias networks. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced Product Qualification | AQEC-compliant manufacturing with controlled baseline, single fab/test site, and military temp range (−55°C to +125°C). |
| Ultralow Input Bias Current | 2 nA max at 25°C - minimizes voltage error in high-impedance pH, strain gauge, or piezoelectric sensor interfaces. |
| Low Drift Performance | 0.9 µV/°C input offset drift and 5 ppm/°C gain drift (G = 1) - reduces recalibration frequency in long-duration measurements. |
| High-Speed Settling | 0.6 µs to 0.001% at G = 100 - enables high-channel-count multiplexed DAQ systems with minimal dead time. |
| Robust Input Protection | Inputs survive ±40 V beyond opposite supply - eliminates external series resistors in 24 V industrial I/O modules. |
Applications
| Structural Health Monitoring | Vibration Analysis in Jet Engines |
|---|---|
|
Use Scenario: Measuring microstrain from bonded foil gauges on airframe components under thermal cycling and mechanical stress. IC Role / Device Role / Timing Role: Precision instrumentation amplifier extracting µV-level differential signals amid 100+ dB common-mode noise from actuator switching. Use Value: 124 dB CMRR at G = 100 and 3.2 nV/√Hz noise preserve SNR > 90 dB over full −55°C to +125°C operational envelope. |
Use Scenario: Conditioning accelerometer outputs in turbine blade monitoring systems exposed to extreme temperature gradients and EMI. IC Role / Device Role / Timing Role: High-bandwidth (2 MHz @ G = 100), low-settling (0.6 µs) in-amp capturing transient resonance peaks above 100 kHz. Use Value: 35 V/µs slew rate and 0.001% settling ensure faithful reproduction of shock events without phase distortion or overshoot. |
| Downhole Oilfield Sensors | Spacecraft Radiation Monitor Front-End |
|
Use Scenario: Amplifying thermocouple and RTD signals in drill-string telemetry tools operating at 175°C ambient (derated). IC Role / Device Role / Timing Role: Low-power (2.3 mA), high-precision in-amp with 160 µV max input offset over temperature for stable cold-junction compensation. Use Value: 84 dB min DC CMRR and 80 dB at 20 kHz reject common-mode noise from high-current motor drivers sharing same chassis ground. |
Use Scenario: Reading ionization chamber currents in satellite radiation dosimeters where leakage current must remain below 2 pA. IC Role / Device Role / Timing Role: Ultra-low-bias (2 nA max), low-noise instrumentation amplifier converting fA-level currents to measurable voltage with minimal Johnson noise contribution. Use Value: 200 fA/√Hz current noise and 30 GΩ input impedance maximize charge integration fidelity over multi-year orbital missions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8422ARZ | Commercial-grade (−40°C to +85°C); 3.5 nV/√Hz noise; 3.5 mA supply current; no AQEC qualification. | Lacks military temperature range and enhanced product traceability; unsuitable for flight-critical hardware. | Select AD8422ARZ only for cost-sensitive terrestrial industrial systems with benign thermal profiles. |
| INA128UA | 3.5 nV/√Hz noise; 1.5 mA supply current; 120 dB CMRR at G = 100; not specified beyond 85°C. | Lower bandwidth (1.3 MHz @ G = 100); no input overvoltage protection beyond rails; no extended temp support. | Choose INA128UA for lower-power, non-military applications where 0.001% settling time < 1 µs is not required. |
Compared with AD8421TRMZ-EP, AD8422ARZ trades military qualification and tighter noise for lower cost, while INA128UA offers reduced quiescent current but sacrifices bandwidth, overvoltage robustness, and temperature range - making AD8421TRMZ-EP uniquely suited for high-reliability embedded sensing where all three attributes are mandatory.
Availability
AD8421TRMZ-EP is available at Aetrix Electronics and suitable for aerospace telemetry, downhole instrumentation, and defense-grade test equipment requiring stable component supply across extended temperature extremes and long production lifecycles.
Supply support for AD8421TRMZ-EP 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision measurement, industrial automation, and aerospace markets since 1965.
The AD8421-EP product line delivers radiation-tolerant, temperature-qualified instrumentation amplifiers designed specifically for mission-critical signal conditioning in defense, space, and energy exploration systems.
FAQ
What is the maximum gain achievable with AD8421TRMZ-EP?
The AD8421TRMZ-EP supports a gain range of 1 to 10,000, set by a single external resistor across pins 2 and 3 using the formula G = 1 + (9.9 kΩ / RG). At G = 10,000, the bandwidth reduces to 200 kHz, and settling time increases to 6 µs (0.001%), as confirmed in the Rev. 0 datasheet Table 1. The AD8421TRMZ-EP maintains monotonic performance across this full range without gain peaking or instability.
Does AD8421TRMZ-EP support single-supply operation?
Yes, AD8421TRMZ-EP operates from a single supply of 5 V to 36 V, in addition to dual supplies of ±2.5 V to ±18 V. When used in single-supply mode, the input common-mode range extends from (−VS + 2.3 V) to (+VS − 1.8 V), and the output swings from (−VS + 1.2 V) to (+VS − 1.7 V), where −VS is ground. This allows direct interfacing with microcontroller ADCs referenced to the same supply.
How is the reference pin (REF) used in AD8421TRMZ-EP?
The REF pin on AD8421TRMZ-EP accepts a low-impedance voltage source to add a precise DC offset to the output: VOUT = G × (V+IN − V−IN) + VREF. Its gain to output is 1 ± 0.0001 V/V, and it accepts voltages from −VS to +VS. This enables level-shifting for unipolar ADC inputs or nulling of sensor offsets without additional op-amps - a feature explicitly validated across −55°C to +125°C in the AD8421TRMZ-EP datasheet.
What packaging and marking does AD8421TRMZ-EP use?
AD8421TRMZ-EP is supplied in an 8-lead Mini Small Outline Package (MSOP), JEDEC MO-187-AA compliant, with package option RM-8 and branding code Y4T. The "TRMZ" suffix denotes tape-and-reel packaging, and "-EP" confirms Enhanced Product qualification per AQEC standards. Dimensions are 3.00 mm × 3.00 mm × 1.10 mm max height, with 0.65 mm lead pitch and coplanarity ≤ 0.10 mm.
Is AD8421TRMZ-EP pin-compatible with other AD8421 variants?
Yes, AD8421TRMZ-EP shares identical pinout, footprint, and electrical behavior with AD8421ARMZ and AD8421BRMZ, differing only in temperature qualification (−55°C to +125°C), manufacturing baseline control, and AQEC documentation. All variants use the same 8-lead MSOP (RM-8) package and pin configuration shown in Figure 3 of the AD8421-EP datasheet Rev. 0.
AD8421TRMZ-EP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 35V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 10 MHz
- Current - Input Bias:
- 1 nA
- Voltage - Input Offset:
- 70 µV
- Current - Supply:
- 2mA
- Current - Output / Channel:
- 65 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8421TRMZ-EP FAQ
1.How can I place an order for AD8421TRMZ-EP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8421TRMZ-EP 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 AD8421TRMZ-EP reliable?
The price and inventory of AD8421TRMZ-EP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8421TRMZ-EP is usually 5 days.
3.What payment methods are accepted for AD8421TRMZ-EP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8421TRMZ-EP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8421TRMZ-EP?
AD8421TRMZ-EP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8421TRMZ-EP 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 AD8421TRMZ-EP?
For technical support, including AD8421TRMZ-EP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8421TRMZ-EP requirements.
6.How does Aetrix verify that AD8421TRMZ-EP is sourced from the original manufacturer or authorized distributors?
All AD8421TRMZ-EP 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 AD8421TRMZ-EP meets industry standards.
7.What is the process for return or replacement of AD8421TRMZ-EP?
All AD8421TRMZ-EP units undergo pre-shipment inspection (PSI). If there is an issue with AD8421TRMZ-EP, 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 AD8421TRMZ-EP part is unused and in its original packaging.
Return procedure for AD8421TRMZ-EP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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