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Texas Instruments LMH6645MA/NOPB
- Part No.:
- LMH6645MA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6645MA/NOPB.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:572
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Product details
Overview
LMH6645MA/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 ±20 mA linear output current while consuming only 650 μA per channel at 2.7 V supply - enabling precision signal conditioning in battery-powered portable instrumentation and sensor interfaces.
For engineers reviewing the LMH6645MA/NOPB datasheet, LMH6645MA/NOPB pinout, LMH6645MA/NOPB application, or LMH6645MA/NOPB equivalent, key selection criteria include its rail-to-rail I/O swing (within 20 mV of rails), 17 nV/√Hz input voltage noise at 100 kHz, shutdown capability (in LMH6647 variant), and stable performance across 2.5–12 V supply range with minimal voltage dependence on bandwidth and slew rate.
Technical Context
The LMH6645MA/NOPB uses Texas Instruments' VIP10 dielectrically isolated bipolar process to achieve high ft (~8 GHz) under low supply conditions. Its input stage supports common-mode voltage beyond both rails by 0.3 V, and its Class A-B "turn-around" output stage enables rail-to-rail swing while maintaining low distortion and thermal efficiency.
This amplifier employs a complementary bipolar architecture with a common-emitter push-pull output stage capable of sourcing/sinking ±20 mA within 0.5 V of either rail. Key performance parameters - including −3 dB bandwidth (55 MHz), slew rate (22 V/μs), and output current - remain stable across supply voltages from 2.5 V to 12 V due to process and architectural compensation.
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 medium-speed data acquisition frequencies. |
| Slew Rate | 22 V/μs - enables clean 10 VPP square-wave reproduction at ≥2 MHz without slewing distortion. |
| Supply Current | 650 μA/channel at 2.7 V - allows integration into ultra-low-power systems such as handheld medical sensors or IoT edge nodes. |
| Input Voltage Noise | 17 nV/√Hz at 100 kHz - suitable for low-level analog front-ends where signal integrity dominates over power budget. |
| Output Swing | Within 20 mV of either rail at light load - maximizes dynamic range in single-supply 3.3 V or 2.7 V systems. |
| Input Common-Mode Range | Extends 0.3 V beyond both supply rails - simplifies level-shifting and eliminates need for external biasing in AC-coupled designs. |
| CMRR | 77 dB minimum (at 2.7 V) - ensures robust rejection of supply-induced common-mode interference in noisy environments. |
Pinout & Package
SOT-23-5 package (2.90 mm × 1.60 mm body size) with exposed pad for thermal enhancement; compatible with standard pick-and-place and reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUTPUT | Amplifier output node | Delivers rail-to-rail voltage swing; drives loads up to ±20 mA with <20 mV headroom to rails. |
| 2 - V− | Negative supply connection | Accepts ground (single-supply) or negative rail (dual-supply); supports operation down to 0 V. |
| 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 input pair node; matched to +IN for precision closed-loop gain accuracy. |
| 5 - V+ | Positive supply connection | Operates from 2.5 V to 12 V; PSRR >75 dB minimizes supply ripple coupling into output. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization in low-voltage (2.7 V) systems without external level-shifting circuitry. |
| 55 MHz bandwidth at 650 μA | Delivers high-speed performance per unit power - 84.6 MHz/mA figure-of-merit - superior to most micropower op-amps. |
| 17 nV/√Hz input voltage noise | Preserves SNR in sensor-amplifier stages where source impedance is ≤10 kΩ and signal bandwidth <1 MHz. |
| Stable across 2.5–12 V supply | Eliminates recalibration or gain adjustment when migrating between 3.3 V, 5 V, or 10 V system rails. |
| Input CMVR extends beyond rails | Supports direct interfacing to transducers or ADCs operating outside amplifier supply domain (e.g., ±10 V sensors into 3.3 V system). |
Applications
| Active Filters | Portable Instrumentation |
|---|---|
Use Scenario: Second-order Sallen-Key low-pass filter in handheld multimeter front-end. IC Role / Device Role / Timing Role: Precision gain-setting and buffering stage with minimal phase shift up to 10 MHz. Use Value: 55 MHz bandwidth and 22 V/μs slew rate ensure flat group delay and step response fidelity below cutoff frequency. | Use Scenario: Signal conditioning for MEMS accelerometer output in wearable health monitor. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail amplifier driving 12-bit SAR ADC with 3.3 V supply. Use Value: 17 nV/√Hz noise and 20 mV rail headroom maximize effective resolution without external biasing. |
| Current Sense Buffer | High-Speed Transducer Amp |
Use Scenario: Bidirectional shunt-based current monitoring in USB-C PD controller. IC Role / Device Role / Timing Role: High-common-mode rejection buffer amplifying mV-level differential voltage across 10 mΩ shunt. Use Value: 77 dB CMRR and rail-to-rail input allow accurate sensing even when shunt sits near supply rail. | Use Scenario: Amplification of piezoelectric vibration sensor output in predictive maintenance module. IC Role / Device Role / Timing Role: Wideband charge amplifier with fast settling (<250 ns to ±1%) for transient event capture. Use Value: 22 V/μs slew rate and 55 MHz bandwidth preserve pulse edges and resonance peaks up to 5 MHz. |
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 200 MHz GBW but 2.3 mA supply current; no rail-to-rail input (CMVR = V− to V+ − 1.5 V). | Better for wideband AC-coupled gain stages where input biasing is acceptable; unsuitable for DC-coupled rail-to-rail sensor interfaces. | Select OPA355DBVR only when bandwidth >100 MHz is required and power budget allows >3× higher quiescent current. |
| ADA4891-1ARJZ-R7 | Lower 220 MHz GBW, 1.2 mA supply current, rail-to-rail I/O, but 4.5 nV/√Hz noise - 3.8× lower than LMH6645MA/NOPB. | Preferred for ultra-low-noise, moderate-bandwidth (<50 MHz) applications like audio preamps or precision DAC buffers. | Choose ADA4891-1ARJZ-R7 when noise dominates design priority and bandwidth requirements are ≤35 MHz. |
Compared with OPA355DBVR and ADA4891-1ARJZ-R7, the LMH6645MA/NOPB uniquely balances 55 MHz bandwidth, 650 μA supply current, and true rail-to-rail input - making it optimal for battery-powered, DC-coupled, medium-bandwidth signal chains where power, dynamic range, and simplicity are co-constrained.
Availability
LMH6645MA/NOPB is available at Aetrix Electronics and suitable for active filters, portable instrumentation, current sense buffering, and high-speed transducer amplification requiring stable component supply across industrial, medical, and test equipment programs.
Supply support for LMH6645MA/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, and personal electronics markets.
The LMH6645MA/NOPB belongs to TI's LMH664x family of rail-to-rail I/O amplifiers designed specifically for low-voltage, high-speed signal conditioning in portable and space-constrained applications.
FAQ
What is the maximum supply voltage for LMH6645MA/NOPB?
The LMH6645MA/NOPB supports a recommended operating supply voltage range of 2.5 V to 12 V (V+ – V−). Absolute maximum rating is 12.6 V. Operation above 12 V risks permanent damage, and performance specifications are not ensured outside the 2.5–12 V range. The LMH6645MA/NOPB maintains consistent 55 MHz bandwidth and 22 V/μs slew rate across this full range.
Does LMH6645MA/NOPB have shutdown functionality?
No, the LMH6645MA/NOPB does not include a shutdown pin. Shutdown capability is exclusive to the LMH6647 variant (SOT-23-6 and SOIC-8 packages). The LMH6645MA/NOPB is a single-channel amplifier in SOT-23-5 package with pins limited to V+, −IN, +IN, V−, and OUTPUT. For power-gated applications, external enable circuitry or use of LMH6647 is required.
What is the input common-mode voltage range of LMH6645MA/NOPB?
The LMH6645MA/NOPB features rail-to-rail input with an input common-mode voltage range extending 0.3 V beyond both supply rails - i.e., from (V− − 0.3 V) to (V+ + 0.3 V) - at room temperature. This allows direct interface to signals outside the supply domain, such as grounded sensors in single-supply systems. The LMH6645MA/NOPB maintains ≥50 dB CMRR across this extended range.
Can LMH6645MA/NOPB drive a 50 Ω load?
The LMH6645MA/NOPB is not optimized for direct 50 Ω termination. Its specified linear output current is ±20 mA at 0.5 V from rails, supporting ≥250 Ω loads at full swing. Driving 50 Ω continuously risks thermal overload and output clipping. For 50 Ω applications, use a dedicated line driver (e.g., THS3201) or add series isolation resistance. The LMH6645MA/NOPB can drive 50 Ω briefly during pulse testing if output swing is limited to ≤1 VPP.
What package type is used for LMH6645MA/NOPB?
The LMH6645MA/NOPB is supplied in a 5-pin SOT-23 package (Texas Instruments package code DBV05A) with nominal body dimensions of 2.90 mm × 1.60 mm. It is RoHS-compliant and lead-free (NOPB suffix). This compact footprint supports high-density PCB layouts in portable electronics and space-constrained modules where the LMH6645MA/NOPB's 650 μA quiescent current and rail-to-rail I/O deliver critical advantages.
LMH6645MA/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- VIP10™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
LMH6645MA/NOPB FAQ
1.How can I place an order for LMH6645MA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6645MA/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 LMH6645MA/NOPB reliable?
The price and inventory of LMH6645MA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6645MA/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6645MA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6645MA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6645MA/NOPB?
LMH6645MA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6645MA/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 LMH6645MA/NOPB?
For technical support, including LMH6645MA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6645MA/NOPB requirements.
6.How does Aetrix verify that LMH6645MA/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6645MA/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 LMH6645MA/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6645MA/NOPB?
All LMH6645MA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6645MA/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 LMH6645MA/NOPB part is unused and in its original packaging.
Return procedure for LMH6645MA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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