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Analog Devices Inc. LT6231CDD#TRPBF
- Part No.:
- LT6231CDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT6231CDD#TRPBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,994
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Product details
Overview
LT6231CDD#TRPBF from Analog Devices (formerly Linear Technology) is a dual, rail-to-rail output, low-noise, unity-gain stable operational amplifier in an 8-lead 3mm × 3mm DFN package. It delivers 1.1nV/√Hz input voltage noise, 215MHz gain-bandwidth product, 70V/µs slew rate, and 3.5mA per amplifier supply current - optimized for low-voltage signal conditioning in ultrasound amplifiers and A/D driver applications.
For engineers reviewing the LT6231CDD#TRPBF datasheet, LT6231CDD#TRPBF pinout, LT6231CDD#TRPBF application, or LT6231CDD#TRPBF equivalent, this page provides verified electrical specifications, thermal performance data, enable-pin timing behavior, rail-to-rail output swing limits at 3.3V/5V/±5V supplies, and real-world settling time (55ns to 0.1%) - all confirmed for the C-grade, 0°C to 70°C temperature range.
Technical Context
The LT6231CDD#TRPBF implements a high-speed voltage-feedback architecture with internal compensation for unity-gain stability. Its dual-channel layout shares a common V+ and V– supply but features fully independent input and output stages, enabling use in differential receiver or dual-path filtering configurations without crosstalk degradation up to 10MHz.
It integrates an active enable control pin (Pin 5), allowing shutdown to ≤10µA per amplifier while preserving rail-to-rail input common-mode range (–3V to 4V on ±5V supplies). The amplifier maintains >115dB CMRR and >115dB PSRR across 10Hz–10kHz, supporting precision DC-coupled sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise Voltage Density | 1.1nV/√Hz at 10kHz - enables sub-µV signal amplification in low-level sensor front-ends without dominating system noise floor. |
| Gain-Bandwidth Product | 215MHz at AV ≥ 1 - supports closed-loop bandwidths >50MHz with moderate gain, suitable for wideband active filters and RF IF buffers. |
| Slew Rate | 70V/µs - ensures distortion-free reproduction of 10MHz, 2VP-P signals with <–40dBc harmonic distortion. |
| Supply Current per Amp | 3.5mA max at 5V - balances speed and power for battery-sensitive portable instrumentation requiring dual-channel analog signal paths. |
| Rail-to-Rail Output Swing | Within 50mV of rails at 20mA load - maximizes dynamic range in 3.3V systems, delivering >3.2VP-P output into 1kΩ. |
| Enable Pin Turn-Off Time | 41µs - allows controlled power sequencing in multi-stage analog chains without output glitches or latch-up risk. |
| Operating Temperature Range | 0°C to 70°C - qualified for commercial-grade embedded systems including medical diagnostics and test equipment. |
Pinout & Package
LT6231CDD#TRPBF is housed in an 8-lead (3mm × 3mm) plastic DFN package with exposed metal pad connected to V–. Thermal resistance θJA = 160°C/W enables operation at full rated current without external heatsinking under typical PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT A | Amplifier A output | Capable of sourcing/sinking ±30mA; swings rail-to-rail with <50mV headroom at 20mA load. |
| 2: –IN A | Inverting input A | High-impedance node (7.5kΩ differential); matched to +IN A within 100µV offset for precision differential gain. |
| 3: +IN A | Non-inverting input A | Common-mode range extends to within 1.15V of rails on 3.3V supply - supports single-supply sensor biasing. |
| 4: V– | Negative supply / ground reference | Internally bonded to underside metal pad; must be connected to low-impedance ground plane for thermal and noise performance. |
| 5: V+ | Positive supply | Accepts 3V to 12.6V total supply; PSRR >115dB ensures immunity to digital supply noise coupling. |
| 6: OUT B | Amplifier B output | Electrically isolated from OUT A; channel separation >120dB at 1MHz prevents crosstalk in dual-path designs. |
| 7: –IN B | Inverting input B | Matched to +IN B with ≤100µV offset voltage difference - critical for dual-opamp instrumentation topologies. |
| 8: +IN B | Non-inverting input B | Identical AC/DC specs to +IN A; enables true dual-channel synchronous acquisition without calibration skew. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise efficiency | en·√Isupply = 1.9 - among lowest noise-power trade-off for op amps operating below 5mA, ideal for portable EEG/ECG front-ends. |
| Enable-controlled power gating | Reduces supply current to ≤10µA per amplifier - enables duty-cycled signal acquisition in energy-constrained IoT sensor nodes. |
| Rail-to-rail output stage | Delivers >98% of supply voltage swing at 15mA load - eliminates need for level-shifting circuitry in 3.3V ADC driver designs. |
| High-speed settling | 55ns to 0.1% for 2V step - meets timing requirements for multiplexed 10MSPS SAR ADC drivers with minimal dead time. |
| Robust short-circuit protection | Indefinite output short-circuit duration at ±5V - survives accidental probe contact or PCB trace shorts during lab validation. |
| Low input capacitance | 7.7pF differential input capacitance - minimizes peaking and phase margin loss when driving anti-aliasing filter capacitors directly. |
Applications
| Ultrasound Receiver Amplifier | Low-Power A/D Converter Driver |
|---|---|
|
Use Scenario: Amplifying weak echo signals (≤100µV) from piezoelectric transducers in portable ultrasound machines. IC Role / Device Role / Timing Role: First-stage low-noise preamplifier with 20–50MHz bandwidth and selectable gain via external resistors. Use Value: 1.1nV/√Hz noise density preserves SNR of microvolt-level echoes; rail-to-rail output drives 12-bit ADC inputs without clipping at 3.3V supply. |
Use Scenario: Driving the analog input of a 12-bit SAR ADC in a handheld multimeter or data logger. IC Role / Device Role / Timing Role: Buffer and level-shifter between high-impedance sensor outputs and ADC sample-and-hold capacitor. Use Value: 55ns settling time ensures full accuracy at 10MSPS sampling; 3.5mA quiescent current extends battery life in Class II portable instruments. |
| Active Anti-Aliasing Filter | Rail-to-Rail Instrumentation Buffer |
|
Use Scenario: Implementing a 4th-order Butterworth low-pass filter before high-speed digitization in spectrum analyzers. IC Role / Device Role / Timing Role: Dual-opamp topology realizing 2-pole sections with matched gain and phase response. Use Value: Channel-to-channel matching (≤100µV VOS, ≤1µA IB) ensures <0.01° phase error across filter bands up to 10MHz. |
Use Scenario: Isolating and buffering thermocouple or strain gauge outputs in industrial PLC analog input modules. IC Role / Device Role / Timing Role: Unity-gain buffer with wide input common-mode range (–3V to 4V on ±5V) and low drift. Use Value: 0.5µV/°C VOS TC and >115dB CMRR reject common-mode noise from 4–20mA loop-powered sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4898-2ARMZ | Higher noise (0.9nV/√Hz), higher supply current (10.5mA), wider GBW (270MHz), no enable pin | Preferred for ultra-high-speed (>100MHz) applications where power is secondary; unsuitable for battery-powered enable-controlled systems | Select ADA4898-2ARMZ only when >200MHz closed-loop bandwidth is required and shutdown functionality is unnecessary |
| OPA211IDGKT | Lower noise (1.1nV/√Hz same), lower supply current (3.6mA), lower GBW (45MHz), no enable pin, SO-8 only | Better for cost-sensitive, space-tolerant designs needing precision DC performance over wide bandwidth; lacks DFN footprint and enable control | Choose OPA211IDGKT for high-precision, low-drift (<0.1µV/°C) applications below 50MHz where board area and power sequencing are not constraints |
Compared with ADA4898-2ARMZ and OPA211IDGKT, the LT6231CDD#TRPBF uniquely combines 215MHz bandwidth, 1.1nV/√Hz noise, enable functionality, and DFN packaging - making it optimal for compact, battery-aware, wideband analog signal chains where both speed and power control are mandatory.
Availability
LT6231CDD#TRPBF is available at Aetrix Electronics and suitable for ultrasound imaging systems, portable test equipment, and industrial data acquisition requiring stable component supply with guaranteed 0°C to 70°C performance and lead-free RoHS-compliant packaging.
Supply support for LT6231CDD#TRPBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving aerospace, medical, industrial, and communications markets.
The LT6231 belongs to Linear Technology's "UltraFast™ Low-Noise Op Amp" product line, engineered specifically for wideband, low-power signal conditioning in portable diagnostic, test, and measurement equipment where noise, speed, and supply flexibility are co-critical.
FAQ
What is the maximum supply voltage for LT6231CDD#TRPBF?
The absolute maximum total supply voltage (V+ to V–) for LT6231CDD#TRPBF is 12.6V. Operation beyond this rating risks permanent damage. For reliable long-term performance, Analog Devices specifies a recommended maximum of ±5V (10V total) or 3V to 12.6V single-supply operation. The LT6231CDD#TRPBF is characterized and guaranteed over 3V to 12.6V, with full parametric validation at 3.3V, 5V, and ±5V.
Does LT6231CDD#TRPBF support rail-to-rail input operation?
No, LT6231CDD#TRPBF does not support rail-to-rail input operation. Its input common-mode voltage range is specified as –3V to 4V on ±5V supplies and 1.15V to 2.65V on 3.3V supplies - meaning inputs must remain at least ~1.15V above V– and ~0.65V below V+. However, its output is rail-to-rail, swinging within 50mV of either supply rail under 20mA load. This makes LT6231CDD#TRPBF ideal as a buffer or driver, not as a direct sensor interface without external biasing.
What is the enable pin behavior of LT6231CDD#TRPBF?
The enable pin (Pin 5) of LT6231CDD#TRPBF controls amplifier bias current: pulling it low (≤0.3V) disables both amplifiers, reducing total supply current to ≤10µA; pulling it high (≥V+ – 0.35V) enables normal operation. Turn-on time is 300ns, turn-off time is 41µs. During disable, output leakage remains ≤10µA, and input offset voltage is undefined. This behavior is confirmed for the C-grade LT6231CDD#TRPBF across 0°C to 70°C.
How does LT6231CDD#TRPBF compare to LT6230 and LT6232 in the same family?
LT6231CDD#TRPBF is the dual-amplifier variant in the LT6230 family. Compared to the single LT6230 (SOT-23) and quad LT6232 (SSOP-16), LT6231CDD#TRPBF shares identical noise (1.1nV/√Hz), GBW (215MHz), and slew rate (70V/µs) per channel but adds channel matching (≤100µV VOS match) and DFN packaging. Unlike LT6230-10 (optimized for AV ≥10), LT6231CDD#TRPBF is unity-gain stable and not rated for higher-gain configurations.
Is LT6231CDD#TRPBF pin-compatible with other DFN-packaged dual op amps?
No, LT6231CDD#TRPBF uses a proprietary 8-lead DFN pinout (OUT A, –IN A, +IN A, V–, V+, OUT B, –IN B, +IN B) that differs from industry-standard dual op amp DFN footprints such as MSOP-8 or SO-8. It is not pin-compatible with AD8620ARDZ, OPA2350UA, or MCP6022-I/SN. Layout reuse requires explicit verification against the LT6231CDD#TRPBF mechanical drawing (Package DD, 3mm × 3mm).
LT6231CDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 70V/µs
- Gain Bandwidth Product:
- 215 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- 450 µV
- Current - Supply:
- 3.3mA (x2 Channels)
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 12.6 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT6231CDD#TRPBF FAQ
1.How can I place an order for LT6231CDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6231CDD#TRPBF 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 LT6231CDD#TRPBF reliable?
The price and inventory of LT6231CDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6231CDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT6231CDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6231CDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6231CDD#TRPBF?
LT6231CDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6231CDD#TRPBF 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 LT6231CDD#TRPBF?
For technical support, including LT6231CDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6231CDD#TRPBF requirements.
6.How does Aetrix verify that LT6231CDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT6231CDD#TRPBF 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 LT6231CDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT6231CDD#TRPBF?
All LT6231CDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6231CDD#TRPBF, 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 LT6231CDD#TRPBF part is unused and in its original packaging.
Return procedure for LT6231CDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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