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Analog Devices Inc. AD8538WAUJZ-R7
- Part No.:
- AD8538WAUJZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AD8538WAUJZ-R7.pdf
- Description:
- IC OPAMP ZER-DRIFT 1CIR TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,542
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Product details
Overview
AD8538WAUJZ-R7 from Analog Devices is a single-channel, automotive-qualified, auto-zero precision operational amplifier in a 5-lead TSOT-23 package. It delivers 13 µV max input offset voltage, 0.03 µV/°C drift, 180 µA supply current, and rail-to-rail output swing - enabling high-accuracy signal conditioning in battery-powered sensor interfaces and automotive temperature measurement systems.
For engineers reviewing the AD8538WAUJZ-R7 datasheet, AD8538WAUJZ-R7 pinout, AD8538WAUJZ-R7 application, or AD8538WAUJZ-R7 equivalent, key selection criteria include its guaranteed −40°C to +125°C operation, 2.7 V to 5.5 V single-supply range, ultra-low bias current (25 pA), and qualification per AEC-Q100 for under-hood sensing and electronic control units.
Technical Context
The AD8538WAUJZ-R7 employs auto-zeroing architecture to continuously correct input offset and drift, achieving near-zero DC errors over temperature and time. Its CMOS input stage enables 25 pA input bias current and supports operation down to 2.7 V with full rail-to-rail output swing.
This amplifier is optimized for low-noise, low-drift DC-coupled applications where long-term stability and minimal power consumption are critical - including strain gauge amplification, thermocouple cold-junction compensation, and precision current sensing in automotive ECUs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 13 µV maximum at 25°C; ensures ≤30 µV error across −40°C to +125°C - critical for sub-millivolt-level sensor signal accuracy |
| Offset Drift | 0.03 µV/°C typical; guarantees <0.1 µV/°C max drift - eliminates calibration rework in wide-temperature automotive environments |
| Supply Current | 180 µA per amplifier at 5 V; enables >10-year battery life in portable instrumentation and tire pressure sensors |
| Input Bias Current | 25 pA typical; prevents significant voltage drop across high-impedance sources like pH electrodes or piezoresistive sensors |
| CMRR | 115 dB minimum; rejects common-mode noise from engine harnesses and switching regulators in vehicle subsystems |
| PSRR | 105 dB minimum; maintains DC accuracy despite ±100 mV ripple on 3.3 V or 5 V automotive rails |
| Gain Bandwidth | 430 kHz; sufficient for DC–100 Hz sensor bandwidths while preserving phase margin >65° with 20 pF load |
Pinout & Package
AD8538WAUJZ-R7 is housed in a 5-lead TSOT-23 (UJ-5) package, 1.6 mm × 2.8 mm × 0.9 mm, compliant with JEDEC MO-193-AB (height/thickness exceptions noted). Designed for space-constrained automotive modules and portable medical devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Output | Rail-to-rail voltage source; drives loads ≥10 kΩ with <5 mV saturation at 25 µA sink/source |
| 2 V− | Negative Supply | Ground reference for single-supply operation; accepts 0 V (GND) or negative rail in dual-supply mode |
| 3 +IN | Non-Inverting Input | High-impedance CMOS node; supports direct connection to high-Z sensors without loading error |
| 4 −IN | Inverting Input | Differential input node; used with feedback network to set closed-loop gain and reject common-mode interference |
| 5 V+ | Positive Supply | Accepts 2.7 V to 5.5 V; internal regulation ensures stable core biasing across automotive battery transients |
Key Features
| Feature | Design Value |
|---|---|
| Auto-zero architecture | Eliminates 1/f noise and drift accumulation - maintains baseline stability over 15+ years in automotive ECU deployments |
| Automotive qualification | AEC-Q100 Grade 1 (−40°C to +125°C); includes stress testing for humidity, thermal cycling, and board-level reliability |
| Rail-to-rail output | Swings within 5 mV of rails at 25 µA load - maximizes dynamic range when interfacing with 12-bit ADCs on 3.3 V supplies |
| Low input bias current | 25 pA typical - avoids >1 mV error across 100 MΩ thermistor networks used in cabin temperature sensing |
| No phase reversal | Guaranteed under input overdrive - prevents latch-up or erroneous actuation in safety-critical feedback loops |
Applications
| Automotive Cabin Temperature Sensing | Portable Electronic Scale Front-End |
|---|---|
|
Use Scenario: Measuring NTC thermistor voltage in HVAC control modules with 0.1°C resolution requirement. IC Role / Device Role / Timing Role: Precision DC amplifier conditioning thermistor bridge output before 16-bit sigma-delta ADC. Use Value: 0.03 µV/°C drift ensures <0.05°C calibration drift over 10-year vehicle lifetime without field recalibration. |
Use Scenario: Amplifying microvolt-level output from load cell bridges in handheld weighing devices. IC Role / Device Role / Timing Role: Low-noise, zero-drift gain stage providing 100× differential amplification prior to ADC sampling. Use Value: 13 µV max offset enables <10 mg resolution on 5 kg scale using standard 12-bit ADC without software offset correction. |
| Battery-Powered Gas Detector | Industrial Thermocouple Interface |
|
Use Scenario: Signal conditioning for electrochemical CO sensor with 10 nA full-scale output current. IC Role / Device Role / Timing Role: Transimpedance amplifier converting sensor current to voltage with ultra-low input bias. Use Value: 25 pA input bias minimizes offset error to <250 µV across 10 MΩ feedback resistor - preserving ppm-level gas concentration accuracy. |
Use Scenario: Cold-junction compensation and linearization of Type K thermocouple in programmable logic controller I/O modules. IC Role / Device Role / Timing Role: Precision buffer and offset correction stage for RTD-based reference junction measurement. Use Value: 115 dB CMRR rejects 60 Hz pickup from adjacent motor drives, ensuring <0.5°C measurement integrity in noisy factory floors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8628AUJZ-R7 | Same auto-zero architecture, but 1 µV max offset and 0.002 µV/°C drift; 220 µA supply current | Targeted at metrology-grade instruments requiring higher initial accuracy; not automotive-qualified | Select AD8628AUJZ-R7 only if system-level calibration budget allows tighter offset spec and AEC-Q100 is not required |
| TSV911ICT | Zero-drift architecture with 250 µV max offset and 1.5 µV/°C drift; 80 µA supply current; no automotive qualification | Cost-optimized for consumer-grade portable devices where ±1°C sensor error is acceptable | Choose TSV911ICT for non-automotive, cost-sensitive designs needing low power but tolerating higher drift and offset |
Compared with AD8538WAUJZ-R7, AD8628AUJZ-R7 offers superior DC precision at higher quiescent current and without automotive qualification, while TSV911ICT trades accuracy for lower cost and power - making AD8538WAUJZ-R7 the optimal balance of AEC-Q100 compliance, ultra-low drift, and 180 µA efficiency for Tier-1 automotive subsystems.
Availability
AD8538WAUJZ-R7 is available at Aetrix Electronics and suitable for automotive ECU design, battery-powered instrumentation, and industrial sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8538WAUJZ-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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD8538 product line delivers auto-zeroed precision op amps engineered specifically for automotive and industrial applications demanding guaranteed performance from −40°C to +125°C with minimal drift and ultra-low power.
FAQ
What is the operating temperature range for the AD8538WAUJZ-R7?
The AD8538WAUJZ-R7 is qualified for continuous operation from −40°C to +125°C, meeting AEC-Q100 Grade 1 requirements. This range is fully supported by all electrical specifications in the datasheet, including offset voltage (≤30 µV), drift (≤0.1 µV/°C), and supply current (≤215 µA), making it suitable for under-hood automotive applications and industrial environments with extreme thermal cycling.
Does the AD8538WAUJZ-R7 support rail-to-rail input and output?
The AD8538WAUJZ-R7 features rail-to-rail output but not rail-to-rail input. Its input common-mode voltage range extends from 0 V to V+ − 0.2 V at 5 V supply (or 0 V to 2.5 V at 2.7 V supply), allowing use with ground-referenced sensors. The output swings within 5 mV of both rails at light loads, preserving dynamic range for low-voltage ADC interfacing without external level-shifting circuitry.
How does the auto-zero architecture of the AD8538WAUJZ-R7 affect its noise performance?
The AD8538WAUJZ-R7's auto-zero architecture eliminates 1/f noise, resulting in 2.0 µV p-p integrated noise (0.1 Hz to 10 Hz) and 50 nV/√Hz broadband noise at 1 kHz. Unlike chopper-stabilized amplifiers, it avoids switching artifacts - confirmed by Figure 24 and Figure 53 in the datasheet - making it ideal for precision DC measurements where low-frequency noise directly impacts resolution.
Can the AD8538WAUJZ-R7 drive capacitive loads without instability?
Yes, the AD8538WAUJZ-R7 is unity-gain stable and maintains ≥65° phase margin with up to 20 pF capacitive load, as verified in Figure 14 and Figure 43. For loads >20 pF, a small series resistor (10–50 Ω) at the output is recommended to isolate capacitance and preserve stability - a common practice in sensor signal chains with long PCB traces or cable-driven outputs.
Is the AD8538WAUJZ-R7 pin-compatible with other members of the AD8538/AD8539 family?
The AD8538WAUJZ-R7 uses the 5-lead TSOT-23 (UJ-5) footprint, which is identical to AD8538AUJZ-R2/REEL/REEL7. It is not pin-compatible with the 8-lead SOIC_N (R-8) or MSOP (RM-8) variants of AD8538 or AD8539. Layout reuse is possible only between UJ-5 packaged versions; migration to SOIC or MSOP requires PCB redesign due to different pin count and spacing.
AD8538WAUJZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- 430 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 15 pA
- Voltage - Input Offset:
- 5 µV
- Current - Supply:
- 150µA
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
AD8538WAUJZ-R7 FAQ
1.How can I place an order for AD8538WAUJZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8538WAUJZ-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 AD8538WAUJZ-R7 reliable?
The price and inventory of AD8538WAUJZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8538WAUJZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8538WAUJZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8538WAUJZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8538WAUJZ-R7?
AD8538WAUJZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8538WAUJZ-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 AD8538WAUJZ-R7?
For technical support, including AD8538WAUJZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8538WAUJZ-R7 requirements.
6.How does Aetrix verify that AD8538WAUJZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8538WAUJZ-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 AD8538WAUJZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8538WAUJZ-R7?
All AD8538WAUJZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8538WAUJZ-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 AD8538WAUJZ-R7 part is unused and in its original packaging.
Return procedure for AD8538WAUJZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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