LMH6624MAX/ - 1.5GHz Low Noise Op Amp | Texas Instruments
MPN: LMH6624MAX/ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.2 | $6.20 |
| 10 | $5.58 | $55.80 |
| 100 | $4.95 | $495.00 |
| 500 | $4.42 | $2,210.00 |
| 1,000 | $3.88 | $3,880.00 |
LMH6624MAX/ Overview
A voltage-feedback op amp is a class of analog amplifier whose closed-loop bandwidth is set by the feedback network rather than the op amp's internal gain, allowing designers to trade gain for bandwidth. Voltage-feedback amplifiers (VFAs) sit within the broader operational amplifier hierarchy, which includes current-feedback amplifiers (CFAs), instrumentation amplifiers, and precision chopper-stabilized amplifiers. The LMH6624 family targets wideband precision signal chains where low noise and low DC error must coexist at high frequency.
Key features include 1.5 GHz gain-bandwidth, 0.92 nV/√Hz input noise, 2.3 pA/√Hz current noise, 100 µV VOS, ±0.1 µV/°C drift, 1500 V/µs typical slew rate, and 70 mA output current. The wide supply range supports ±2.5 V to ±6 V dual or 5 V to 12 V single-supply operation. The SOIC-8 surface-mount package offers a thermal resistance around 150 C/W and supports -40 °C to +125 °C ambient operation.
The device uses a bipolar transistor input stage and complementary bipolar output stage, allowing rail-to-rail output swing within ~0.7 V of either supply. The architecture balances voltage noise and current noise favorably for source impedances in the 1 kΩ to 50 kΩ range, which is the sweet spot for photodiode transimpedance, ADC buffers, and ultrasonic preamps.
Typical applications include photodiode transimpedance amplifiers, ultrasonic preamps, IF/RF signal-chain buffers, high-speed ADC input drivers, active filters, and precision instrumentation front-ends. In transimpedance applications, the combination of 0.92 nV/√Hz and 2.3 pA/√Hz noise is critical when the photodiode capacitance and feedback resistor push the noise optimum into this impedance window.
When designing, keep feedback resistor values low to limit noise gain peaking, use a small feedback capacitor to stabilize the loop, and place supply-bypass capacitors within 2 mm of the V+ and V- pins. Output drive is rated to ±70 mA but sustained DC output current near this value will heat the SOIC-8 package quickly - derate or use the SOIC-8 EP variant for heavier loads.
This page synthesizes distributor pricing, drop-in alternatives, and design notes not found in the manufacturer datasheet, giving engineers a one-stop specification and selection resource.
Drop-in alternatives for LMH6624MAX/ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LMH6624MAX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LMH6624MA/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LMH6643MAX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LMH6609MFX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LMH6624MAX/ Maximum Ratings & Electrical Characteristics
| Amplifier Type | Voltage Feedback |
| Number of Channels | 1 |
| Gain-Bandwidth Product | 1.5 GHz |
| Slew Rate | 1500 V/µs (typical) |
| Input Voltage Noise Density | 0.92 nV/√Hz |
| Input Current Noise Density | 2.3 pA/√Hz |
| Input Offset Voltage (VOS) | 100 µV (typical) |
| Input Offset Voltage Drift | ±0.1 µV/°C |
| Input Bias Current | 20 µA (typical, from digchip summary) |
| Supply Voltage Range (Dual) | ±2.5 V to ±6 V |
| Supply Voltage Range (Single) | 5 V to 12 V |
| Output Current | ±70 mA |
| Operating Temperature Range | -40 °C to +125 °C |
| Package | 8-SOIC (MAX suffix) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (NOPB variant) |
LMH6624MAX/ Pin Configuration
| Pin 1 | OUTPUT — Amplifier output |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply |
| Pin 5 | NC/DISABLE — Not connected or disable (tie to V+ to enable, per datasheet) |
| Pin 6 | V+ — Positive supply |
| Pin 7 | NC — Not connected |
| Pin 8 | NC — Not connected |
Typical Applications
LMH6624MAX/ is suitable for 6 applications: Photodiode Transimpedance Amplifier, Ultrasonic Preamplifier, IF/RF Buffer Amplifier, High-Speed ADC Input Driver, Active Filter Building Block, Precision Instrumentation Front-End.
Photodiode Transimpedance Amplifier
The LMH6624MAX/'s 0.92 nV/√Hz input voltage noise paired with 2.3 pA/√Hz current noise places the noise optimum at source impedances of roughly 1 kΩ to 50 kΩ, which is the operating point of most silicon and InGaAs photodiodes in the 1–20 pF range. Combined with 1.5 GHz GBW, the amplifier holds 100 MHz closed-loop bandwidth at a 10 kΩ transimpedance gain, enabling detection of pulsed optical signals down to sub-ns rise times. Place a small feedback capacitor (typically 0.5–2 pF) directly across the feedback resistor to suppress noise-gain peaking. The result is a TIA suitable for LIDAR receivers, optical front-ends, and pulse-oximetry front-ends where both DC precision and wide bandwidth matter.
Recommended
Ultrasonic Preamplifier
Ultrasonic transducers operating at 1–20 MHz require wideband low-noise amplification to preserve axial resolution and detect small echo returns. The LMH6624MAX/'s 1.5 GHz GBW and 1500 V/µs slew rate let the amplifier deliver low distortion at 20 MHz with >40 dB gain, while the 0.92 nV/√Hz noise floor keeps the input-referred noise of the preamp below the transducer's self-noise. Dual ±5 V supplies are typical to keep the input common-mode centered at ground. The 100 µV VOS and ±0.1 µV/°C drift are also useful when the preamp sits at the end of a long coaxial cable where temperature gradients are common. This combination is also used in non-destructive testing and sonar front-ends.
Recommended
IF/RF Buffer Amplifier
The LMH6624MAX/ serves as a low-distortion buffer between an IF stage and a high-speed ADC. Its 1.5 GHz GBW handles 70 MHz IF signals at moderate gain without rolling off the upper harmonics, while 0.92 nV/√Hz noise and 100 µV VOS preserve both the noise figure and DC accuracy of the signal chain. The amplifier drives 50 Ω transmission lines directly with the proper back-termination resistor, and the ±70 mA output current supports up to 4 Vpp into 50 Ω at ±5 V supplies. Designers use the LMH6624MAX/ in cellular base-station receivers, software-defined radio front-ends, and spectrum-analyzer IF strips where 0.92 nV/√Hz outperforms the built-in ADC driver but full 5 GHz GBW parts are not needed.
Recommended
High-Speed ADC Input Driver
Driving 14- to 16-bit ADCs sampling at 50–100 MSPS requires an op amp with low noise, low distortion, and fast settling. The LMH6624MAX/'s 0.92 nV/√Hz voltage noise and 100 µV VOS keep the SNR budget intact, while 1.5 GHz GBW and 1500 V/µs slew rate let it settle to 16-bit accuracy within 35 ns. The amplifier is typically configured as a unity-gain buffer with a 2.5 V common-mode voltage injected into the +input through a resistor divider. Two LMH6624MAX/ devices form a fully-differential ADC driver on ADC inputs that need true differential signaling. Pin-compatible with most 8-SOIC ADC driver sockets, it is also a popular retrofit when a higher-performance driver is needed in an existing design.
Recommended
Active Filter Building Block
The LMH6624MAX/ works well as the gain element in Sallen-Key, multiple-feedback, and state-variable active filters operating up to 5 MHz. Its 1.5 GHz GBW keeps the open-loop gain high enough that filter Q remains predictable, and 0.92 nV/√Hz keeps the filter's stopband noise floor low. The SOIC-8 package is small enough for dense filter banks; designers commonly use a 2-op-amp instrumentation topology with two LMH6624MAX/ to build precision bandpass filters for instrumentation and audio analyzer front-ends. The ±0.1 µV/°C drift is helpful when the filter cutoff is set by precision resistor networks that share the same PCB thermal mass.
Recommended
Precision Instrumentation Front-End
The LMH6624MAX/ is often placed as the first stage in a multi-op-amp instrumentation amplifier where the sensor output is a low-level, wideband signal. The 0.92 nV/√Hz voltage noise and ±0.1 µV/°C drift minimize the amplifier's contribution to the overall error budget, and the 1.5 GHz GBW keeps the front-end bandwidth above 100 kHz for high-fidelity vibration and strain-gauge measurements. The 8-SOIC package is footprint-compatible with the LT1028 and AD797 in legacy precision designs, making the LMH6624MAX/ a low-cost upgrade in industrial data-acquisition modules. Use supply-bypass capacitors within 2 mm of the pins to maintain PSRR at high frequency.
Recommended
Recommended Products Summary
Engineering reference data for LMH6624MAX/ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LMH6624MAX/NOPB | LMH6624MA/NOPB | LMH6643MAX/NOPB | LMH6609MFX/NOPB |
|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Gain-Bandwidth Product | 1.5 GHz | 1.5 GHz | 1.5 GHz | 130 MHz | 900 MHz |
| Slew Rate | 1500 V/µs | 1500 V/µs | 1500 V/µs | 130 V/µs | 1100 V/µs |
| Input Voltage Noise | 0.92 nV/√Hz | 0.92 nV/√Hz | 0.92 nV/√Hz | 0.92 nV/√Hz | 4.8 nV/√Hz |
| Input Offset Voltage | 100 µV | 100 µV | 100 µV | 1 mV | 2 mV |
| Supply Range (Dual) | ±2.5 V to ±6 V | ±2.5 V to ±6 V | ±2.5 V to ±6 V | ±2.5 V to ±6 V | ±2.5 V to ±6 V |
| Output Current | ±70 mA | ±70 mA | ±70 mA | ±50 mA | ±100 mA |
| Operating Temp Range | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +85 °C | -40 °C to +125 °C | -40 °C to +85 °C |
Key Differentiators
- 1.5 GHz GBW with 0.92 nV/√Hz noise is rare in SOIC-8 (vs LMH6643MAX/NOPB)
- Lower VOS than LMH6609 at similar bandwidth (vs LMH6609MFX/NOPB)
- RoHS drop-in with identical die (vs LMH6624MAX/NOPB)
Design Notes
Place a 0.1 µF X7R ceramic supply-bypass capacitor within 2 mm of each supply pin (V+ pin 6, V- pin 4) and add a 10 µF tantalum or aluminum polymer bulk capacitor on each rail near the part. The LMH6624MAX/'s 1.5 GHz GBW makes it sensitive to supply impedance at high frequency - every extra milliohm of supply trace inductance can produce PSRR degradation above 100 MHz. Keep the supply-trace loop area under 25 mm² and use a ground plane on layer 2 directly under the SOIC-8 footprint.
At ±5 V supply and 70 mA DC output current into a short circuit, the LMH6624MAX/ dissipates approximately 0.7 W internally. The 8-SOIC package has a θJA around 150 °C/W, which gives a junction temperature rise of 105 °C above ambient. Sustained DC short-circuit operation will trigger thermal shutdown or destroy the part - the safe continuous output current is 25–30 mA at ±5 V, with peak currents to ±70 mA allowed for transient pulse loads below 100 ms. For heavier continuous loads use the SOIC-8 EP variant.
Do not leave the disable pin (pin 5) floating - on some datasheet revisions pin 5 is documented as 'NC' and on others as 'DISABLE'. When the disable function is present, leaving pin 5 floating puts the part in an undefined state. Always tie pin 5 to V+ to enable the output, or to V- to disable. Second common pitfall: do not assume the LMH6624MAX/ can operate from a 3.3 V single supply - the absolute minimum single-supply voltage is 5 V. Below 5 V the output stage saturates and DC accuracy is lost.
Keep the feedback network as compact as possible - the area of the feedback loop on the PCB should be under 25 mm². The 1.5 GHz GBW amplifies stray capacitance across the feedback resistor, so a 0.5 pF parasitic can produce 30% bandwidth loss at gain = 10. Use a ground plane directly under the feedback network to provide a stable reference. For transimpedance applications, place a feedback capacitor (typically 0.5–2 pF) directly across the feedback resistor with leads shorter than 2 mm to control noise-gain peaking.
Compliance Information
RoHS compliance applies to LMH6624MAX/NOPB variant. The base LMH6624MAX/ (without NOPB) carries SnPb lead finish and is not RoHS compliant.
