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Analog Devices Inc. LT1057IS8
- Part No.:
- LT1057IS8
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1057IS8.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,695
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Product details
Overview
LT1057IS8 from Analog Devices (formerly Linear Technology) is a dual JFET-input precision operational amplifier in an 8-lead SOIC package, rated for –40°C to +85°C operation. It delivers 14 V/µs slew rate, 5 MHz gain-bandwidth product, 250 µV max input offset voltage (over temperature), and 50 pA bias current at 70°C - enabling high-speed, low-error signal conditioning in instrumentation and data acquisition systems.
For engineers reviewing the LT1057IS8 datasheet, LT1057IS8 pinout, LT1057IS8 application, or LT1057IS8 equivalent, this page provides verified electrical specifications, thermal performance data, SOIC package layout guidance, and validated alternatives for precision analog design where JFET input impedance, microvolt-level DC accuracy, and 10–100 kHz settling fidelity are critical.
Technical Context
The LT1057IS8 employs matched JFET input stages with laser-trimmed thin-film resistors to achieve low offset voltage and drift. Its architecture supports unity-gain stable operation with capacitive load tolerance up to 100 pF and maintains >58° phase margin across temperature.
It features phase reversal protection - unlike legacy JFET op amps (e.g., LF412A) - preventing output lock-up when common-mode voltage exceeds –12 V with ±15 V supplies. Input resistance exceeds 1 TΩ differential and 100 GΩ common-mode over its full operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 14 V/µs min - enables ≤1.3 µs settling to 0.02% for 10 V step, critical for fast sample-and-hold and DAC output buffering |
| Gain-Bandwidth Product | 5 MHz typ - supports stable closed-loop gain ≥10 at 500 kHz, suitable for wideband sensor amplification |
| Input Offset Voltage | 250 µV max over –40°C to +85°C - ensures <±1 mV error in 12-bit systems with ±10 V full-scale range |
| Input Bias Current | ±50 pA max at 70°C - preserves signal integrity in high-impedance photodiode or piezoelectric sensor interfaces |
| Input Noise Density | 13 nV/√Hz at 1 kHz - contributes <1.3 µV RMS noise in 100 kHz bandwidth, ideal for low-noise preamplifiers |
| Common-Mode Rejection | 98 dB min - rejects >99.9% of 60 Hz interference in single-supply instrumentation front-ends |
| Supply Current per Amp | 2.8 mA max at 70°C - allows dual-channel operation within 6 mA total, compatible with low-power embedded systems |
Pinout & Package
LT1057IS8 is housed in an 8-lead plastic SOIC (S8) package with JEDEC MS-012AC outline, 1.27 mm pitch, and 5.0 mm × 6.2 mm footprint. Pin 1 is marked by a bevel edge or dimple; thermal resistance θJA = 200°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output A | Inverting amplifier output; drives loads up to 150 mA; requires external compensation if driving >100 pF |
| 2 | Inverting Input A (–IN A) | High-impedance JFET node; guard ring routing essential for picoampere bias current preservation |
| 3 | Non-inverting Input A (+IN A) | Matched to –IN A for CMRR optimization; must be guarded identically to maintain >98 dB rejection |
| 4 | V– (Negative Supply) | Connects to system ground or negative rail; decoupling capacitor (0.1 µF) required within 5 mm |
| 5 | V+ (Positive Supply) | Accepts ±15 V max; internal ESD protection clamps to rails; bypassing critical for PSRR >102 dB |
| 6 | Non-inverting Input B (+IN B) | Independent channel input; shares same die substrate as Channel A - board layout must isolate traces |
| 7 | Inverting Input B (–IN B) | Matched pair with +IN B; differential input capacitance is 4 pF - limits high-Z AC coupling network bandwidth |
| 8 | Output B | Second independent output; identical specs to Output A; no internal crosstalk mitigation - layout separation mandatory |
Key Features
| Feature | Design Value |
|---|---|
| Phase reversal protection | Eliminates output latch-up during common-mode overvoltage (e.g., sensor transients), avoiding servo system failure |
| Matched JFET input pairs | Ensures <±2 µV/°C offset drift matching between channels - critical for dual-channel difference amplifiers |
| Low 1/f noise corner | 28 Hz corner frequency - enables stable DC-coupled operation in precision integrators and log amps |
| High channel separation | 130 dB at DC - prevents crosstalk in dual-channel simultaneous sampling applications |
| Robust capacitive load drive | Stable with 100 pF CL at unity gain - simplifies anti-alias filter integration without external isolation resistors |
Applications
| Instrumentation Amplifier Front-End | Precision Sample-and-Hold Circuit |
|---|---|
Use Scenario: Amplifying low-level bridge sensor outputs (e.g., strain gauges) in industrial weigh scales with 16-bit ADCs. IC Role / Device Role / Timing Role: Dual op amp configured as first-stage gain block and buffer; Channel A sets gain, Channel B isolates hold capacitor. Use Value: 250 µV max VOS ensures <0.01% gain error; 14 V/µs slew rate settles 10 V step in <1.3 µs to 0.02%, meeting 100 kSPS timing budgets. |
Use Scenario: Capturing fast transient waveforms in oscilloscope front-ends requiring sub-microsecond aperture time. IC Role / Device Role / Timing Role: Buffering the hold capacitor during acquisition; high input impedance prevents droop, fast slew enables rapid charge transfer. Use Value: 1 TΩ input resistance limits hold capacitor leakage to <1 µV/s at 10 nF; 1.3 µs settling guarantees accurate capture of 500 kHz signals. |
| Photodiode Transimpedance Amplifier | Logarithmic Amplifier for Optical Sensing |
Use Scenario: Converting nanoampere photocurrents from PIN diodes in spectrophotometers with 100 dB dynamic range. IC Role / Device Role / Timing Role: Transimpedance amplifier with feedback resistor; JFET inputs prevent bias current-induced offset errors. Use Value: 50 pA max IB at 70°C avoids >5 mV error across 100 MΩ RF; 13 nV/√Hz noise enables detection of 10 pA signals at 1 kHz. |
Use Scenario: Compressing 10-decade light intensity range (1 nW–10 mW) into linear voltage output for fiber optic power monitoring. IC Role / Device Role / Timing Role: Log amp core using matched JFET pair; Channel A forms diode-connected transistor, Channel B provides reference current. Use Value: Matched VOS drift (<2 µV/°C) ensures <0.1 dB error over temperature; low 1/f noise prevents baseline wander in slow optical ramp measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual JFET-input precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1057S8 | Same silicon, but rated only for 0°C to +70°C; 330 µV max VOS over temp vs. 250 µV for LT1057IS8 | Limited to commercial-temperature environments; unsuitable for automotive or industrial ambient extremes | Select LT1057S8 only if operating temperature never exceeds +70°C and cost sensitivity outweighs thermal margin needs. |
| OPA2134UA | TI part with 8 V/µs slew rate, 8 MHz GBW, 500 µV max VOS over –40°C to +85°C; higher supply current (4 mA/amp) | Lower speed and higher offset limit use in <500 kHz applications; wider supply range (±4 V to ±18 V) | Choose OPA2134UA when wider supply flexibility or lower cost is prioritized over settling time and microvolt accuracy. |
Compared with LT1057S8, the LT1057IS8 offers tighter offset voltage and extended temperature qualification; versus OPA2134UA, it delivers superior speed and DC precision at the expense of supply voltage flexibility and higher unit cost.
Availability
LT1057IS8 is available at Aetrix Electronics and suitable for precision instrumentation, medical sensor interfaces, and test equipment requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1057IS8 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 acquired Linear Technology in 2017, inheriting its legacy of high-performance analog ICs. Linear pioneered precision JFET op amps for demanding measurement applications.
The LT1057 product line was designed specifically for upgrade paths from legacy dual JFET op amps (LF412A, OP-215), delivering superior speed, offset, and phase-reversal immunity in standard 8-pin footprints.
FAQ
What is the maximum operating temperature range for the LT1057IS8?
The LT1057IS8 is specified for continuous operation from –40°C to +85°C ambient temperature. This extended industrial temperature grade distinguishes it from the commercial-grade LT1057S8 (0°C to +70°C) and ensures reliability in harsh environments such as factory automation controllers and outdoor instrumentation. All key parameters - including offset voltage, bias current, and slew rate - are guaranteed across this full range.
Does the LT1057IS8 require external compensation for unity-gain stability?
No, the LT1057IS8 is internally compensated for unity-gain stability. It maintains phase margin >58° with capacitive loads up to 100 pF and remains stable driving purely resistive feedback networks. However, when driving larger capacitive loads (>100 pF) or long cables, a small series resistor (10–50 Ω) between the output and load is recommended to isolate the amplifier from reactive loading effects.
How does the LT1057IS8's phase reversal protection work, and why does it matter?
The LT1057IS8 incorporates a dedicated circuit that disables the input stage when common-mode voltage drops below –12 V (with ±15 V supplies), preventing output polarity inversion. This eliminates catastrophic lock-up in servo loops and closed-loop systems - a known failure mode in older JFET op amps like the LF412A. In applications such as motor position feedback or active filters, this feature ensures deterministic behavior during fault conditions.
Can the LT1057IS8 replace the LF412A directly on existing PCBs?
Yes, the LT1057IS8 uses the industry-standard 8-pin SOIC (S8) footprint and pinout, making it a direct drop-in replacement for the LF412A in surface-mount designs. Electrical improvements - including 2× higher slew rate, 50% lower offset voltage, and phase reversal protection - enhance performance without layout changes. Note: The LT1057IS8's S8 pinout differs from through-hole PDIP versions, so only verify compatibility with SOIC-layout boards.
What layout practices are essential to achieve the LT1057IS8's specified 50 pA bias current?
To preserve the LT1057IS8's ultra-low input bias current, guard rings must surround both inputs and the feedback network, tied to a low-impedance potential near the input common-mode voltage. Use Teflon or polyimide substrates, remove all flux residues, apply conformal coating in humid environments, and avoid FR-4 near inputs due to surface leakage. Board leakage >100 fA/V will dominate the 50 pA spec - proper guarding reduces effective leakage by >1000×.
LT1057IS8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 13V/µs
- Gain Bandwidth Product:
- 5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 7 pA
- Voltage - Input Offset:
- 220 µV
- Current - Supply:
- 1.7mA (x2 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 20 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1057IS8 FAQ
1.How can I place an order for LT1057IS8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1057IS8 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 LT1057IS8 reliable?
The price and inventory of LT1057IS8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1057IS8 is usually 5 days.
3.What payment methods are accepted for LT1057IS8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1057IS8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1057IS8?
LT1057IS8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1057IS8 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 LT1057IS8?
For technical support, including LT1057IS8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1057IS8 requirements.
6.How does Aetrix verify that LT1057IS8 is sourced from the original manufacturer or authorized distributors?
All LT1057IS8 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 LT1057IS8 meets industry standards.
7.What is the process for return or replacement of LT1057IS8?
All LT1057IS8 units undergo pre-shipment inspection (PSI). If there is an issue with LT1057IS8, 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 LT1057IS8 part is unused and in its original packaging.
Return procedure for LT1057IS8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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