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Texas Instruments LM7121IM5/NOPB
- Part No.:
- LM7121IM5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM7121IM5/NOPB.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:641
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Product details
Overview
LM7121IM5/NOPB from Texas Instruments is a high-speed voltage-feedback operational amplifier in SOT-23-5 package, delivering 235-MHz bandwidth (−3 dB, AV = +1, RL = 100 Ω), 1300 V/μs slew rate, and stable operation with unlimited capacitive loads - ideal for video signal buffering in compact PC video cards and digital camera front-ends.
For engineers reviewing the LM7121IM5/NOPB datasheet, LM7121IM5/NOPB pinout, LM7121IM5/NOPB application, or LM7121IM5/NOPB equivalent, this page provides verified supply voltage ranges (±5 V), thermal metrics (RθJA = 325 °C/W), DC/AC electrical characteristics across ±5 V, ±15 V, and +5 V configurations, and real-world layout guidance for unity-gain stability with capacitive loads.
Technical Context
The LM7121IM5/NOPB uses a voltage-feedback topology optimized for wideband AC performance, with internal compensation enabling unity-gain stability without external components at ±5 V supplies. Its architecture supports fast settling (74 ns to 0.1% at ±15 V) and low distortion (0.065% THD at 1 MHz, RL = 150 Ω, AV = +2).
It operates across three supply configurations: ±5 V (SOT-23-5 max), ±15 V (SOIC-8 only), and +5 V single supply - with distinct bandwidth (160 MHz at ±5 V, AV = +1), slew rate (520 V/μs at ±5 V), and output swing (±2.75 V into 2 kΩ) per mode. Input-referred noise is 17 nV/√Hz at 10 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (−3 dB) | 235 MHz at ±15 V, AV = +1, RL = 100 Ω - enables full NTSC/PAL video baseband amplification without roll-off |
| Slew Rate | 1300 V/μs at ±15 V - supports clean 10-VPP pulses with <5.3 ns rise/fall time into 100 Ω |
| Supply Voltage Range | ±5 V (SOT-23-5 rated); not rated for ±15 V - limits use to low-voltage portable imaging systems |
| Input Offset Voltage | 1.6 mV typical at ±5 V - ensures <1 LSB error in 12-bit ADC buffer applications with 2 V input range |
| Supply Current | 5.1 mA typical at ±5 V - enables battery-powered designs with <26 mW quiescent power (±5 V) |
| Capacitive Load Drive | Stable with unlimited capacitive loads - eliminates need for isolation resistors when driving long PCB traces or cable interfaces |
| Input Noise Density | 17 nV/√Hz at 10 kHz - preserves SNR in high-gain analog front-ends for CCD/CMOS sensor outputs |
Pinout & Package
SOT-23-5 package (2.921 mm × 1.651 mm body size), surface-mount, lead-free (NOPB), moisture sensitivity level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Amplified signal source; drives 100–2 kΩ loads directly; stable into >1 nF capacitance |
| 2 | Negative Supply (V−) | Return path for dual-supply operation; must be connected to −5 V rail (not GND) for ±5 V mode |
| 3 | Non-inverting Input (+IN) | High-impedance (3.4 MΩ differential) node; accepts DC-coupled video or sensor signals up to ±2.5 V CMVR |
| 4 | Inverting Input (−IN) | Feedback summing node; used for gain-setting resistor networks (e.g., 510 Ω + 3 pF for unity gain at ≥6 V) |
| 5 | Positive Supply (V+) | Power input; accepts +5 V in dual-supply mode or +5 V in single-supply configuration (V− = GND) |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-feedback topology | Enables intuitive gain-setting with standard resistive networks - no current-feedback layout constraints or stability tuning required |
| Tiny SOT-23-5 footprint | Occupies half the board area of SOIC-8 equivalents - allows placement adjacent to image sensors or ADC inputs to minimize parasitic inductance |
| Unity-gain stability | Operates stably at AV = +1 with no external compensation at ±5 V - reduces BOM count and layout complexity in video line drivers |
| Low distortion at high frequency | 0.065% THD at 1 MHz (RL = 150 Ω, AV = +2) - maintains color fidelity in RGB video paths and scanner signal chains |
| Wide common-mode input range | ±2.5 V at ±5 V supplies (CMRR ≥60 dB) - accommodates DC-coupled video signals with sync tips and pedestal levels |
Applications
| Scanners & Digital Copiers | PC Video Cards |
|---|---|
Use Scenario: Amplifying RGB or YUV analog video signals from CIS/CCD sensors before digitization. IC Role / Device Role / Timing Role: ADC input buffer with unity gain and DC coupling to preserve black-level accuracy and timing integrity. Use Value: 235-MHz bandwidth ensures full 1080p/60 signal passband; 17 nV/√Hz noise prevents degradation of 12-bit sensor dynamic range. |
Use Scenario: Driving analog VGA or component video outputs from GPU DACs to external monitors. IC Role / Device Role / Timing Role: Cable driver with 75-Ω source termination capability and fast edge preservation. Use Value: 1300 V/μs slew rate delivers <12 ns rise/fall times into 75 Ω; stable with 100+ pF trace capacitance eliminates ringing. |
| Digital Cameras | Cable Drivers |
Use Scenario: Buffering high-speed image data from rolling-shutter CMOS sensors to on-board ADCs. IC Role / Device Role / Timing Role: Low-noise, low-distortion gain stage placed directly at sensor output to minimize pickup. Use Value: SOT-23-5 size allows placement within 3 mm of sensor pad; 5.1 mA supply current enables multi-channel integration in space-constrained modules. |
Use Scenario: Transmitting composite video or RGB over 25 m twisted-pair cables in set-top boxes. IC Role / Device Role / Timing Role: Single-supply line driver (V+ = +5 V, V− = GND) with adjustable gain and cable equalization. Use Value: Stable into 1 nF load capacitance enables direct connection to long cables; 0.65° differential phase error preserves color saturation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS3201DBVT | Higher slew rate (4700 V/μs), wider bandwidth (1.8 GHz), but 12.5 mA supply current and SO-8 only | Targeted at RF/IF signal chains; not optimized for video DC-coupling or low-power portable use | Select THS3201DBVT only when >1 GHz small-signal bandwidth and ultrafast pulse response are mandatory |
| LMH6629MF/NOPB | Lower noise (0.92 nV/√Hz), lower distortion (0.0002% THD), but 10.5 mA supply current and 100 MHz bandwidth | Better suited for precision instrumentation than video; insufficient bandwidth for 1080p baseband | Choose LMH6629MF/NOPB where ultra-low noise dominates over speed, e.g., medical sensor front-ends |
Compared with THS3201DBVT and LMH6629MF/NOPB, the LM7121IM5/NOPB uniquely balances 235-MHz bandwidth, 1300 V/μs slew rate, 5.1 mA quiescent current, and SOT-23-5 size - making it the only viable option for space-constrained, battery-aware video signal conditioning requiring full HD baseband support.
Availability
LM7121IM5/NOPB is available at Aetrix Electronics and suitable for PC video cards, digital cameras, and scanner signal chains requiring stable component supply, consistent parametric performance across temperature (−40°C to +85°C), and long-term industrial lifecycle support.
Supply support for LM7121IM5/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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in high-performance op-amps and signal-chain solutions.
The LM7121 product line was designed specifically for high-fidelity video and imaging applications demanding wide bandwidth, low distortion, and compact packaging - targeting portable and space-constrained systems where traditional SOIC op-amps impose layout penalties.
FAQ
What supply voltages can the LM7121IM5/NOPB operate at?
The LM7121IM5/NOPB is rated for ±5 V dual-supply operation or +5 V single-supply (V− = GND). It is not rated for ±15 V - that voltage range applies only to the SOIC-8 variant (LM7121IM/NOPB). Exceeding ±5 V risks permanent damage, as confirmed by Absolute Maximum Ratings (supply voltage ≤10 V for SOT-23-5).
Is the LM7121IM5/NOPB stable in unity-gain configuration with capacitive loads?
Yes - the LM7121IM5/NOPB is explicitly characterized for stable unity-gain operation with unlimited capacitive loads at ±5 V supplies. This is a key differentiator versus many high-speed op-amps requiring external compensation. Stability is maintained without added series resistance or feedback network adjustments under these conditions.
What is the maximum output swing of the LM7121IM5/NOPB at ±5 V?
At ±5 V supplies, the LM7121IM5/NOPB delivers ±2.75 V minimum output swing into 2 kΩ (high side) and ±2.70 V (low side), per ±5 V DC Electrical Characteristics table. Into 150 Ω, it achieves ±2.3 V (high) and ±2.0 V (low), sufficient for driving 75-Ω video lines with proper termination.
Does the LM7121IM5/NOPB support single-supply operation?
Yes - the LM7121IM5/NOPB supports +5 V single-supply operation with V− tied to GND. In this mode, input common-mode range is 1.5 V to 3.5 V (CMRR ≥45 dB), and output swing is 1.3 V to 3.7 V into 2 kΩ. Total harmonic distortion remains low (0.067% at 1 MHz) for video signal integrity.
What is the thermal resistance (RθJA) of the LM7121IM5/NOPB in SOT-23-5 package?
The LM7121IM5/NOPB has a junction-to-ambient thermal resistance (RθJA) of 325 °C/W in the SOT-23-5 (DBV) package, per Thermal Information table. This value assumes standard JEDEC 2-layer board mounting; actual thermal performance improves with copper pour and thermal vias.
LM7121IM5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 520V/µs
- Gain Bandwidth Product:
- 105 MHz
- -3db Bandwidth:
- 160 MHz
- Current - Input Bias:
- 5.5 µA
- Voltage - Input Offset:
- 1.6 mV
- Current - Supply:
- 5.1mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 11 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM7121IM5/NOPB FAQ
1.How can I place an order for LM7121IM5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM7121IM5/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 LM7121IM5/NOPB reliable?
The price and inventory of LM7121IM5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM7121IM5/NOPB is usually 5 days.
3.What payment methods are accepted for LM7121IM5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM7121IM5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM7121IM5/NOPB?
LM7121IM5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM7121IM5/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 LM7121IM5/NOPB?
For technical support, including LM7121IM5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM7121IM5/NOPB requirements.
6.How does Aetrix verify that LM7121IM5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM7121IM5/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 LM7121IM5/NOPB meets industry standards.
7.What is the process for return or replacement of LM7121IM5/NOPB?
All LM7121IM5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM7121IM5/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 LM7121IM5/NOPB part is unused and in its original packaging.
Return procedure for LM7121IM5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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