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Texas Instruments LMH6645MAX/NOPB
- Part No.:
- LMH6645MAX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6645MAX/NOPB.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,615
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Product details
Overview
LMH6645MAX/NOPB from Texas Instruments is a single-channel, rail-to-rail input and output voltage feedback operational amplifier optimized for low-voltage, low-power, high-speed applications. It delivers 55 MHz −3 dB bandwidth, 22 V/μs slew rate, and 650 μA supply current per channel at 2.7 V, enabling precision signal conditioning in portable medical sensors and battery-powered data acquisition systems.
For engineers reviewing the LMH6645MAX/NOPB datasheet, LMH6645MAX/NOPB pinout, LMH6645MAX/NOPB application, or LMH6645MAX/NOPB equivalent, key selection criteria include its rail-to-rail I/O swing (20 mV from rails), input common-mode range extending 0.3 V beyond supplies, ±20 mA linear output drive, 17 nV/√Hz input voltage noise, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LMH6645MAX/NOPB uses a proprietary VIP10 dielectrically isolated bipolar process to sustain high ft (~8 GHz) under 2.7 V operation. Its class A-B "turn-around" input stage reduces power vs. conventional high-speed op-amps while maintaining low offset drift (±5 μV/°C) and rail-to-rail input capability (CMVR = −0.3 V to 2.9 V at 2.7 V).
The common-emitter push-pull output stage enables 20 mV rail-to-rail swing at light loads and sustains ±20 mA linear output current within 0.5 V of either supply rail. Performance remains stable across 2.5–12 V supply range, with −3 dB bandwidth and slew rate varying less than ±10% from 2.7 V to ±5 V operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 55 MHz at AV = +1 - supports high-fidelity signal amplification up to video and fast ADC driver frequencies |
| Slew Rate | 22 V/μs - enables clean 10-MHz, 2-VPP square wave reproduction without slew-induced distortion |
| Supply Current | 650 μA per channel at 2.7 V - allows continuous operation in coin-cell-powered devices for >1 year |
| Input Voltage Noise | 17 nV/√Hz at 100 kHz - preserves SNR in low-level sensor front-ends (e.g., thermopile, strain gauge) |
| Output Swing | Within 20 mV of either rail at RL = 1 kΩ - maximizes dynamic range in 3.3 V or lower single-supply systems |
| Input CMVR | Extends 0.3 V beyond rails (e.g., −0.3 V to 2.9 V at 2.7 V) - accepts ground-referenced or beyond-rail sensor outputs directly |
| Common-Mode Rejection | 77 dB minimum (25°C) - rejects supply ripple and shared-noise coupling in mixed-signal PCBs |
Pinout & Package
SOT-23-5 package (2.90 mm × 1.60 mm body size) with exposed pad for thermal enhancement; suitable for automated placement and reflow soldering on dense PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUTPUT | Amplifier output | Delivers rail-to-rail voltage swing; drives 1 kΩ load to within 20 mV of V+ or V− |
| 2 - V− | Negative supply | Accepts ground (single-supply) or negative rail (split-supply); supports 2.5–12 V total supply range |
| 3 - +IN | Non-inverting input | High-impedance node (3 MΩ RIN); accepts signals up to 0.3 V beyond V− or V+ |
| 4 - −IN | Inverting input | Differential pair input; matched to +IN for <3 mV VOS and low CMRR degradation |
| 5 - V+ | Positive supply | Supports 2.7 V minimum; enables operation from Li-ion (3.0–4.2 V) or dual AA (3.0 V) sources |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables direct interfacing with unbuffered sensors and ADCs without level-shifting circuitry |
| 55 MHz bandwidth at 650 μA | Provides 10× higher speed-per-mA than legacy micropower op-amps (e.g., TLC27L2) |
| 17 nV/√Hz input voltage noise | Permits sub-10 μV resolution in 100-kHz bandwidth sensor interfaces without external filtering |
| ±20 mA linear output drive | Drives 50-Ω cables or multiple 10-kΩ inputs without gain loss or distortion |
| Stable over 2.5–12 V supply | Eliminates recalibration when migrating from 3.3 V to 5 V or 12 V industrial bus designs |
Applications
| Active Filters | Current Sense Buffer |
|---|---|
Use Scenario: Second-order Sallen-Key low-pass filter for anti-aliasing before a 1-MSPS SAR ADC in portable ECG monitor. IC Role / Device Role / Timing Role: Configured as unity-gain buffer with 55 MHz GBW to maintain phase linearity and group delay flatness below 100 kHz. Use Value: Rail-to-rail output swing preserves full 0–3.3 V ADC input range; 17 nV/√Hz noise avoids degrading 16-bit ENOB. | Use Scenario: Bidirectional shunt amplifier in 12-V automotive body control module measuring 0–100 A motor current. IC Role / Device Role / Timing Role: G = 20 non-inverting amplifier referenced to 2.5 V mid-rail, rejecting common-mode voltage up to ±12 V. Use Value: Input CMVR extends 0.3 V beyond rails, accepting −12.3 V to +12.3 V common-mode; 77 dB CMRR suppresses PWM switching noise. |
| High-Speed Portable Devices | High-Speed Transducer Amp |
Use Scenario: Signal conditioning for MEMS microphone preamp in Bluetooth headset with 3.0-V coin cell supply. IC Role / Device Role / Timing Role: Low-noise, low-power gain stage (AV = +10) operating at 650 μA to extend battery life. Use Value: 17 nV/√Hz input noise dominates system SNR; 55 MHz BW ensures flat response to 20 kHz audio band. | Use Scenario: Amplifying piezoelectric vibration sensor output (high-Z, low-charge) in predictive maintenance IoT node. IC Role / Device Role / Timing Role: Charge amplifier with FET-input emulation via low IB (−0.68 μA typical) and high RIN (3 MΩ). Use Value: Input bias current <1 μA prevents signal droop on 1-nF feedback capacitor over 100-ms measurement windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-power op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA355DBVR | Higher supply current (2.5 mA), wider bandwidth (200 MHz), no rail-to-rail input (CMVR = −0.1 V to 1.9 V at 2.7 V) | Better for RF IF stages; unsuitable for ground-sensed current monitoring | Select when bandwidth >100 MHz required and supply current budget >2 mA |
| ADA4891-1ARJZ-R7 | Lower bandwidth (100 MHz), higher supply current (5.7 mA), rail-to-rail I/O, but input CMVR limited to rails (not beyond) | Preferred for driving ADCs with 5-V supplies; cannot accept sub-ground sensor outputs | Select when driving 10-bit+ ADCs at >10 MSPS with 5-V rail and no sub-rail inputs |
Compared with OPA355DBVR and ADA4891-1ARJZ-R7, LMH6645MAX/NOPB uniquely balances 55 MHz bandwidth, 650 μA quiescent current, and true rail-to-rail input (beyond rails) - making it optimal for battery-powered systems requiring wide input voltage range and minimal power.
Availability
LMH6645MAX/NOPB is available at Aetrix Electronics and suitable for active filters, current sense buffers, high-speed portable devices, and high-speed transducer amplifiers requiring stable component supply across industrial, medical, and consumer design cycles.
Supply support for LMH6645MAX/NOPB 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
Texas Instruments is a global semiconductor company delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.
The LMH664x product line was engineered for low-voltage, high-speed signal conditioning where rail-to-rail I/O, micro-power operation, and robust AC performance are simultaneously required - targeting portable instrumentation and energy-conscious sensing nodes.
FAQ
What is the maximum supply voltage range supported by LMH6645MAX/NOPB?
The LMH6645MAX/NOPB operates across a total supply voltage range of 2.5 V to 12 V, supporting single-supply (e.g., 2.7 V, 3.3 V, 5 V) and split-supply (e.g., ±2.5 V, ±5 V) configurations. Absolute maximum ratings specify V+ − V− ≤ 12.6 V, with junction temperature limited to +150°C. This range allows direct use with Li-ion batteries, USB-powered systems, and industrial 12-V rails without external regulation.
Does LMH6645MAX/NOPB support rail-to-rail input beyond the supply rails?
Yes, LMH6645MAX/NOPB features true rail-to-rail input with common-mode voltage range extending 0.3 V beyond both supply rails - for example, −0.3 V to 2.9 V at V+ = 2.7 V and V− = 0 V. This enables direct connection to ground-referenced sensors, current-sense shunts, or other signals that swing below V− or above V+, eliminating level-shifting components and reducing BOM cost.
What is the typical output voltage swing for LMH6645MAX/NOPB at 2.7 V supply?
At 2.7 V single supply (V− = 0 V, V+ = 2.7 V), LMH6645MAX/NOPB delivers an output swing within 20 mV of each rail - i.e., 40 mV to 2.66 V with RL = 1 kΩ to V+/2. This rail-to-rail capability preserves >98% of available dynamic range, critical for maximizing resolution in low-voltage ADC interfaces and battery-operated signal chains.
How does LMH6645MAX/NOPB perform in terms of input voltage noise?
LMH6645MAX/NOPB exhibits 17 nV/√Hz input-referred voltage noise at 100 kHz and 25°C, rising to 25 nV/√Hz at 1 kHz. This low noise floor supports high-fidelity amplification of weak sensor signals (e.g., thermopiles, photodiodes) without degrading system SNR, especially when combined with its 55 MHz bandwidth and rail-to-rail output for full-scale utilization of downstream ADCs.
Is LMH6645MAX/NOPB pin-compatible with other members of the LMH664x family?
No, LMH6645MAX/NOPB (SOT-23-5) is not pin-compatible with LMH6646 (SOIC-8/VSSOP-8 dual) or LMH6647 (SOT-23-6 with shutdown). The LMH6645MAX/NOPB has five pins: OUTPUT, V−, +IN, −IN, V+. Its pinout differs from the 6-pin LMH6647 (which adds SD) and the 8-pin dual variants. Board layout must be specific to the SOT-23-5 footprint for LMH6645MAX/NOPB.
LMH6645MAX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- VIP10™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 22V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 55 MHz
- Current - Input Bias:
- 650 nA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 725µA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LMH6645MAX/NOPB FAQ
1.How can I place an order for LMH6645MAX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6645MAX/NOPB 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 LMH6645MAX/NOPB reliable?
The price and inventory of LMH6645MAX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6645MAX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6645MAX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6645MAX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6645MAX/NOPB?
LMH6645MAX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6645MAX/NOPB 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 LMH6645MAX/NOPB?
For technical support, including LMH6645MAX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6645MAX/NOPB requirements.
6.How does Aetrix verify that LMH6645MAX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6645MAX/NOPB 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 LMH6645MAX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6645MAX/NOPB?
All LMH6645MAX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6645MAX/NOPB, 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 LMH6645MAX/NOPB part is unused and in its original packaging.
Return procedure for LMH6645MAX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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