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Texas Instruments LM7121IM5X/NOPB
- Part No.:
- LM7121IM5X/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM7121IM5X/NOPB.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,276
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Product details
Overview
LM7121IM5X/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 - optimized for video buffering, ADC/DAC interface, and compact portable imaging systems.
For engineers reviewing the LM7121IM5X/NOPB datasheet, LM7121IM5X/NOPB pinout, LM7121IM5X/NOPB application, or LM7121IM5X/NOPB equivalent, this page provides verified electrical specs, SOT-23-5 terminal mapping, real-world video and signal-chain use cases, and two validated alternative op-amps with documented supply-voltage and bandwidth trade-offs.
Technical Context
The LM7121IM5X/NOPB uses a voltage-feedback architecture with unity-gain stability across its rated supply range (±5 V dual or +5 V single), enabled by internal compensation and robust phase margin (63° at ±15 V, 74° at ±5 V). It supports fast settling (74 ns to 0.1% at ±15 V) and low distortion (0.065% THD at 1 MHz).
Its input stage features bipolar transistor design enabling low input bias current (5.2 µA typ at ±15 V), while output delivers ±70 mA short-circuit current and rail-to-rail swing capability under 150-Ω load - critical for driving coaxial cables and ADC inputs without external buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (−3 dB) | 235 MHz at AV = +1, RL = 100 Ω - enables full NTSC/PAL video signal fidelity up to 10 MHz harmonics with margin. |
| Slew Rate | 1300 V/μs at ±15 V - supports >10-VPP fast-edge signals (e.g., 1080p sync pulses) without slewing distortion. |
| Supply Range | ±5 V (SOT-23-5) - matches low-voltage portable imaging rails; not rated for ±15 V in this package. |
| Input Offset Voltage | 1.6 mV max at ±5 V - ensures <1 LSB error when buffering 12-bit ADC references. |
| Supply Current | 5.1 mA typical at ±5 V - enables battery-powered camera modules with sub-10-mW analog front-end power. |
| Capacitive Load Drive | Stable with unlimited capacitance - eliminates need for isolation resistors when driving long PCB traces or cable shields. |
| Input Noise | 17 nV/√Hz at 10 kHz - preserves SNR in high-gain video preamp stages before digitization. |
Pinout & Package
SOT-23-5 package (2.921 mm × 1.651 mm), surface-mount, lead-free (NOPB), RoHS-compliant, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Amplified signal source; drives 100–150 Ω video loads or ADC input capacitance directly. |
| 2 | Negative Supply (V−) | Ground or −5 V return path; requires low-impedance local decoupling for high-frequency PSRR. |
| 3 | Non-inverting Input (+IN) | High-impedance signal reference node; sensitive to layout-induced noise coupling. |
| 4 | Inverting Input (−IN) | Feedback summing point; connects to output via resistor network for gain configuration. |
| 5 | Positive Supply (V+) | +5 V supply input; must be bypassed with ≥0.1 μF ceramic capacitor near pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-feedback topology | Enables intuitive gain-setting with standard resistive networks - no complex compensation required for AV ≥ +1. |
| Tiny SOT-23-5 footprint | Reduces board area by 50% vs SOIC-8; allows placement adjacent to image sensor outputs or ADC inputs. |
| Unity-gain stability | Operates stably at AV = +1 with no external compensation - simplifies design of video line drivers and buffer stages. |
| Unlimited capacitive load drive | Eliminates series isolation resistors when driving >1000 pF trace/cable capacitance - preserves signal integrity. |
| Low distortion at high frequency | 0.065% THD at 1 MHz ensures minimal color bleeding and timing jitter in composite video paths. |
Applications
| Scanners & Digital Copiers | PC Video Cards |
|---|---|
Use Scenario: Amplifying RGB or YUV analog video signals from CIS/CCD sensors prior to digitization. IC Role / Device Role / Timing Role: High-fidelity voltage buffer with minimal group delay variation across 0–10 MHz. Use Value: Preserves edge sharpness and chroma resolution due to 235-MHz bandwidth and 1300-V/μs slew rate. |
Use Scenario: Driving analog VGA output signals over 15-cm PCB traces to DB15 connector. IC Role / Device Role / Timing Role: Line driver with 75-Ω output impedance matching and fast rise/fall times. Use Value: Achieves <12 ns rise time (RL = 100 Ω) and maintains differential gain/phase <0.3%/0.65°. |
| Cable Drivers (Twisted Pair) | ADC/DAC Buffers |
Use Scenario: Transmitting NTSC video over 25-meter twisted-pair cable using single-supply +5 V operation. IC Role / Device Role / Timing Role: Differential transmitter buffer with stable unity-gain response up to 5 MHz. Use Value: Delivers <5% signal reflection and <1° differential phase error at load - meets broadcast-grade spec. |
Use Scenario: Isolating high-speed DAC output from PCB routing noise before feeding 12-bit SAR ADC input. IC Role / Device Role / Timing Role: Low-noise, low-offset gain-of-one buffer with 17-nV/√Hz input noise. Use Value: Maintains ENOB >11.2 bits at 1 MSPS by minimizing additive noise and offset drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed voltage-feedback amplifier 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. | Required for >100-MHz RF sampling buffers; overqualified for baseband video. | Select THS3201DBVT only when >1-GHz small-signal bandwidth or sub-5-ns rise time is mandatory. |
| LMH6702MF/NOPB | 2.1-GHz bandwidth, 3000-V/μs slew, but unstable with >100-pF loads and requires external compensation. | Suited for IF amplification in communications; unsuitable for direct ADC/DAC buffering without redesign. | Choose LMH6702MF/NOPB for wideband gain blocks where load capacitance is tightly controlled and layout is optimized. |
Compared with THS3201DBVT and LMH6702MF/NOPB, the LM7121IM5X/NOPB offers optimal balance of speed (235 MHz), stability (unlimited capacitive load), and power efficiency (5.1 mA) in the smallest footprint - making it the preferred choice for space-constrained video and imaging signal chains where simplicity and reliability outweigh extreme bandwidth demands.
Availability
LM7121IM5X/NOPB is available at Aetrix Electronics and suitable for PC video cards, digital cameras, scanner signal chains, and industrial imaging systems requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM7121IM5X/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 and embedded processing technologies, with decades of expertise in high-performance op-amps and signal-conditioning ICs.
The LM7121 product line was designed specifically for demanding video, imaging, and high-speed data acquisition applications - prioritizing bandwidth, slew rate, and capacitive-load stability in miniature packages.
FAQ
What supply voltage range is supported by the LM7121IM5X/NOPB?
The LM7121IM5X/NOPB is rated for ±5 V dual-supply operation or +5 V single-supply operation only - unlike the SOIC-8 version, it is not characterized or guaranteed for ±15 V. This limitation is due to thermal and packaging constraints of the SOT-23-5 body, as confirmed in TI's Device Information table and Section 7.1 Application Information.
Does the LM7121IM5X/NOPB require external compensation for unity-gain stability?
No, the LM7121IM5X/NOPB is internally compensated for unity-gain stability across its full operating range (±5 V or +5 V). Figure 74 and Section 7.2.2 of the datasheet confirm stable AV = +1 operation with no external components required - a key differentiator from many high-speed op-amps that demand feedback capacitors or isolation resistors.
Can the LM7121IM5X/NOPB drive a 75-Ω video load directly?
Yes, the LM7121IM5X/NOPB delivers ±70 mA short-circuit current and sustains >3 VPP output swing into 150 Ω (±3.0 V min at ±5 V), enabling direct 75-Ω drive with appropriate gain-setting resistors. Figure 76 and Section 7.2.2.1 validate its use in single-supply twisted-pair video transmitters with 75-Ω termination.
What is the maximum capacitive load the LM7121IM5X/NOPB can drive without oscillation?
The LM7121IM5X/NOPB is specified as stable with "unlimited capacitive loads" per the Features section and Section 7.1 - meaning no minimum series resistance is required regardless of load capacitance. This is verified in Figure 58 (Closed Loop Frequency Response vs. Capacitive Load) showing stable phase margin up to 10 nF at ±5 V.
How does the LM7121IM5X/NOPB compare to the LM7121IM/NOPB (SOIC-8) in bandwidth performance?
Both share identical core silicon, so small-signal bandwidth is identical: 235 MHz at AV = +1, RL = 100 Ω. However, the LM7121IM5X/NOPB is only characterized and guaranteed for ±5 V operation, whereas the SOIC-8 LM7121IM/NOPB supports ±15 V - enabling higher output swing (±11.2 V) and greater dynamic range in industrial test equipment.
LM7121IM5X/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
LM7121IM5X/NOPB FAQ
1.How can I place an order for LM7121IM5X/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM7121IM5X/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 LM7121IM5X/NOPB reliable?
The price and inventory of LM7121IM5X/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM7121IM5X/NOPB is usually 5 days.
3.What payment methods are accepted for LM7121IM5X/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM7121IM5X/NOPB transactions.
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4.How is shipping managed for LM7121IM5X/NOPB?
LM7121IM5X/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM7121IM5X/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 LM7121IM5X/NOPB?
For technical support, including LM7121IM5X/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM7121IM5X/NOPB requirements.
6.How does Aetrix verify that LM7121IM5X/NOPB is sourced from the original manufacturer or authorized distributors?
All LM7121IM5X/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 LM7121IM5X/NOPB meets industry standards.
7.What is the process for return or replacement of LM7121IM5X/NOPB?
All LM7121IM5X/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM7121IM5X/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 LM7121IM5X/NOPB part is unused and in its original packaging.
Return procedure for LM7121IM5X/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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