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Analog Devices Inc. LT1351CMS8#PBF
- Part No.:
- LT1351CMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1351CMS8#PBF.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:281
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Product details
Overview
LT1351CMS8#PBF from Analog Devices (formerly Linear Technology) is a precision, low-power, high-speed voltage-feedback operational amplifier optimized for data acquisition and battery-powered systems. It delivers 3 MHz gain bandwidth, 200 V/µs slew rate, 250 µA supply current, ±13 V output swing into 1 kΩ at ±15 V supplies, and unity-gain stability with any capacitive load - enabling use in photodiode amplifiers and active filters.
For engineers reviewing the LT1351CMS8#PBF datasheet, LT1351CMS8#PBF pinout, LT1351CMS8#PBF application, or LT1351CMS8#PBF equivalent, key selection criteria include shutdown functionality, C-load drive capability, input offset voltage ≤0.6 mV (±15 V), input bias current ≤50 nA, and MSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LT1351CMS8#PBF employs a proprietary complementary bipolar topology that merges voltage-feedback precision with current-feedback slewing behavior. Its single-stage architecture features matched high-impedance inputs, a 1 kΩ input resistor defining slew rate proportionality to differential input voltage, and bootstrapped RC/CC compensation enabling unconditional stability with capacitive loads up to 10 nF.
It operates across ±2.5 V to ±15 V supplies, supports rail-to-rail input common-mode range (±12 V at ±15 V), achieves 0.01% settling in 1.25 µs for 10 V steps, and integrates a dedicated SHDN pin that reduces supply current to ~10 µA when pulled to V– - critical for power-gated instrumentation stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 3 MHz at ±15 V - enables stable closed-loop operation up to 300 kHz in G = 10 configuration without phase margin loss. |
| Slew Rate | 200 V/µs at ±15 V - ensures full-power bandwidth of 3.2 MHz for 10 VPP signals, preserving fidelity in fast transient capture. |
| Supply Current | 250 µA typical at ±15 V - allows continuous operation in 10-year battery-powered sensors without duty cycling. |
| Input Offset Voltage | ≤0.6 mV max at ±15 V - minimizes DC error in precision gain stages (e.g., <0.5 LSB error in 12-bit DAC I-to-V converters). |
| Output Swing | ±13 V into 1 kΩ at ±15 V - delivers full dynamic range to ADC drivers while maintaining linearity under load. |
| Capacitive Load Drive | Stable with any CL - eliminates need for isolation resistors in cable drivers or piezoelectric sensor interfaces. |
| Shutdown Current | ~10 µA at SHDN = V– - enables microamp-level sleep mode in portable data loggers between sampling intervals. |
Pinout & Package
LT1351CMS8#PBF is housed in an 8-lead MSOP (Mini Small Outline Package) with 0.5 mm pitch, 3.0 mm × 3.0 mm body, and exposed pad for thermal enhancement. The package meets JEDEC MO-187AC standards and supports reflow soldering per IPC/JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NULL) | No internal connection | Unused pin; must be left floating or grounded per layout best practices to minimize parasitic coupling. |
| 2 (–IN) | Inverting input | Differential input node with 3 pF capacitance and ±12 V common-mode range at ±15 V supply - requires matched source impedance for bias current cancellation. |
| 3 (+IN) | Non-inverting input | High-impedance input (≥300 MΩ) with complementary NPN/PNP structure enabling <15 nA input offset current - critical for low-leakage transimpedance designs. |
| 4 (V–) | Negative supply rail | Reference for shutdown logic; pulling SHDN to V– activates ultra-low-power mode with 10 µA supply current. |
| 5 (NULL) | No internal connection | Unused pin; no electrical function - avoid routing signals adjacent to prevent crosstalk in high-frequency layouts. |
| 6 (V+) | Positive supply rail | Accepts +2.5 V to +15 V; supplies internal bias networks and output stage - bypass with 0.1 µF ceramic capacitor near pin. |
| 7 (VOUT) | Amplifier output | Class-AB buffered output capable of ±3.4 V into 500 Ω at ±5 V supply - drives ADC inputs or coaxial cables directly without external buffers. |
| 8 (SHDN) | Shutdown control | CMOS-compatible input; operates at V– + 0.1 V threshold - interface with 3.3 V logic via level-shifting transistor (e.g., SST177) per datasheet Figure TA04. |
Key Features
| Feature | Design Value |
|---|---|
| C-Load™ stability | Guaranteed unity-gain stability with all capacitive loads (0–10 nF), eliminating external compensation components in buffer and driver applications. |
| Power-saving shutdown | Reduces quiescent current from 250 µA to 10 µA, enabling >10× battery life extension in intermittent-sampling systems like environmental monitors. |
| Low input bias current | Max 50 nA over temperature - preserves signal integrity in high-impedance sensor interfaces (e.g., pH electrodes, photodiodes) without guard traces. |
| High DC gain | Min 30 V/mV (30,000 V/V) at ±15 V - ensures <10 ppm gain error in precision instrumentation amplifiers using 5 kΩ feedback networks. |
| Fast settling | 700 ns to 0.1% for 10 V step - meets timing requirements for 1 MSPS SAR ADC front-ends with minimal acquisition window overhead. |
Applications
| Photodiode Amplifier | Portable Data Acquisition |
|---|---|
|
Use Scenario: Converting weak current from a 1 cm² silicon photodiode (100 pA–10 µA range) into a low-noise voltage signal for spectral analysis. IC Role / Device Role / Timing Role: Transimpedance amplifier with 5 kΩ feedback resistor, leveraging 14 nV/√Hz input noise and 50 nA input bias current to maximize SNR. Use Value: Enables sub-100 nA resolution without TIA op-amp chopper artifacts, supporting UV-Vis spectrometer portability. |
Use Scenario: Signal conditioning stage in handheld oscilloscope front-end, amplifying ±10 V sensor outputs before 12-bit ADC sampling. IC Role / Device Role / Timing Role: Gain-of-10 amplifier with 3 MHz bandwidth and 1.25 µs 0.01% settling - synchronizing with 1 MSPS ADC clock. Use Value: Eliminates external settling-time compensation, reducing BOM count by one active component per channel. |
| Battery-Powered Instrumentation | Active Filter Stage |
|
Use Scenario: Front-end amplifier in wireless gas sensor node powered by CR2032 coin cell (230 mAh capacity). IC Role / Device Role / Timing Role: Low-power signal conditioner with shutdown pin controlled by MCU GPIO to gate power between 10 s measurement cycles. Use Value: Extends operational lifetime from 6 months to >5 years by cutting average current from 250 µA to 250 nA during idle periods. |
Use Scenario: 4th-order Butterworth filter stage in audio test equipment requiring flat passband to 20 kHz and steep roll-off. IC Role / Device Role / Timing Role: Unity-gain stable amplifier driving 10 nF film capacitors in Sallen-Key topology without oscillation or peaking. Use Value: Removes need for isolation resistors or damping networks, simplifying filter design and improving amplitude accuracy at cutoff frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1352CS8#PBF | Dual-channel version in SO-8; identical AC/DC specs but higher total supply current (500 µA for both amps). | Requires two matched amplifiers (e.g., instrumentation amp + reference buffer); occupies larger PCB area than single LT1351CMS8#PBF. | Select when dual-channel integration reduces system component count despite 2× supply current vs. discrete LT1351CMS8#PBF usage. |
| ADA4891-1ARJZ-R7 | Higher 220 MHz GBW but 3.3 mA supply current; not unity-gain stable with >100 pF loads without external compensation. | Suitable for video or RF gain blocks where speed outweighs power; unsuitable for unbuffered capacitive-load buffering. | Choose only for high-frequency (>10 MHz) applications where LT1351CMS8#PBF's 3 MHz bandwidth is insufficient and power budget allows 13× higher current. |
Compared with LT1352CS8#PBF and ADA4891-1ARJZ-R7, the LT1351CMS8#PBF uniquely balances micropower operation (250 µA), unconditional capacitive-load stability, and precision DC performance - making it irreplaceable in space- and energy-constrained data acquisition channels where alternative op-amps trade off either speed, power, or load-drive robustness.
Availability
LT1351CMS8#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable data acquisition systems, and active filter designs requiring stable component supply with guaranteed long-term availability and traceable lot documentation.
Supply support for LT1351CMS8#PBF 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 built on advanced complementary bipolar processes.
The LT1351CMS8#PBF belongs to Linear's precision high-speed op-amp family, designed specifically for data acquisition systems demanding low power, fast settling, and robust capacitive-load drive - bridging the gap between general-purpose and specialty amplifiers.
FAQ
What is the maximum capacitive load the LT1351CMS8#PBF can drive without instability?
The LT1351CMS8#PBF is specified as stable with "any capacitive load" - including values up to 10 nF - due to its internal bootstrapped RC/CC compensation network. This eliminates external isolation resistors in cable drivers or piezoelectric sensor interfaces. Measured overshoot remains below 16% even with 10 nF loads at unity gain, per Figure G30 in the datasheet. For optimal transient response with >1 nF loads, maintain short PCB traces and ground-plane isolation around the output pin.
Does the LT1351CMS8#PBF require external nulling circuitry for offset adjustment?
No, the LT1351CMS8#PBF does not require external nulling circuitry. Its maximum input offset voltage is 0.6 mV at ±15 V, and the datasheet explicitly states that "the suggested nulling circuit for the LT1351 is shown in Figure 1" only as a legacy reference - modern production units achieve sufficient DC precision without trimming. External nulling would degrade noise performance and is unnecessary for applications requiring <1 mV total offset error.
How does the shutdown feature of the LT1351CMS8#PBF behave during power-up sequences?
During power-up, the LT1351CMS8#PBF enters normal operation when SHDN is left open or held ≥2 V above V–; it does not assert a power-on reset. If SHDN is tied directly to V– at startup, the device remains in shutdown until SHDN rises above the threshold (~V– + 0.1 V). To ensure predictable initialization, tie SHDN to V+ through a 1 MΩ resistor and control it actively after supply rails stabilize - as implemented in the shutdown circuit of Figure TA04 using an SST177 transistor.
Can the LT1351CMS8#PBF be used in single-supply configurations?
Yes, the LT1351CMS8#PBF supports single-supply operation down to +2.5 V (with V– = 0 V), but input common-mode range is limited to 0.5 V to 1.0 V at +2.5 V supply - restricting use to AC-coupled or biased-input topologies. For true rail-to-rail input in single-supply systems, consider alternatives like the AD8605. The LT1351CMS8#PBF excels in dual-supply applications (±2.5 V to ±15 V) where its ±12 V input range and ±13 V output swing maximize dynamic range.
What is the thermal resistance (θJA) of the LT1351CMS8#PBF in its MSOP-8 package?
The LT1351CMS8#PBF in MSOP-8 has a junction-to-ambient thermal resistance (θJA) of 250°C/W, as specified in the "PACKAGE/ORDER INFORMATION" section of the datasheet. This value assumes standard PCB layout with no thermal vias or copper pour. To maintain junction temperature below 150°C at maximum dissipation (240 mW at ±15 V, 16 mA IOUT), use ≥2 cm² of 2-oz copper connected to the exposed pad via ≥4 thermal vias - reducing effective θJA to ~90°C/W in optimized layouts.
LT1351CMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- C-Load™
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 200V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 nA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 250µA
- Current - Output / Channel:
- 13.4 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1351CMS8#PBF FAQ
1.How can I place an order for LT1351CMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1351CMS8#PBF 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 LT1351CMS8#PBF reliable?
The price and inventory of LT1351CMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1351CMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1351CMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1351CMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1351CMS8#PBF?
LT1351CMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1351CMS8#PBF 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 LT1351CMS8#PBF?
For technical support, including LT1351CMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1351CMS8#PBF requirements.
6.How does Aetrix verify that LT1351CMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1351CMS8#PBF 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 LT1351CMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1351CMS8#PBF?
All LT1351CMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1351CMS8#PBF, 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 LT1351CMS8#PBF part is unused and in its original packaging.
Return procedure for LT1351CMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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