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Texas Instruments LM7121IM/NOPB
- Part No.:
- LM7121IM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM7121IM/NOPB.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:797
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Product details
Overview
LM7121IM/NOPB from Texas Instruments is a high-speed voltage-feedback operational amplifier optimized for video, imaging, and portable applications. It delivers 235-MHz bandwidth (−3 dB, AV = +1, RL = 100 Ω), 1300 V/μs slew rate, and stable operation with unlimited capacitive loads - enabling robust buffer and driver functions in PC video cards, digital cameras, and cable driver circuits.
For engineers reviewing the LM7121IM/NOPB datasheet, LM7121IM/NOPB pinout, LM7121IM/NOPB application, or LM7121IM/NOPB equivalent, this page provides verified specifications, SOIC-8 package mapping, real-world use cases, and validated alternative options for high-frequency analog signal conditioning designs.
Technical Context
The LM7121IM/NOPB employs a voltage-feedback topology with unity-gain stability across ±5 V to ±15 V dual supplies and supports single-supply operation up to +5 V. Its architecture enables fast settling (74 ns to 0.1%), low distortion (0.065% THD at 1 MHz), and wide input common-mode range (±13 V at ±15 V supplies).
It features rail-to-rail output swing capability (±11.2 V into 2 kΩ at ±15 V), high PSRR (≥68 dB), and CMRR (≥70 dB), making it suitable for precision video gain stages and ADC/DAC interface buffering where signal fidelity and dynamic range are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (−3 dB) | 235 MHz at AV = +1, RL = 100 Ω - supports NTSC/PAL video bandwidth and high-speed data acquisition sampling. |
| Slew Rate | 1300 V/μs - enables clean 10-VPP pulse reproduction without slewing distortion at >100 MHz frequencies. |
| Supply Voltage Range | ±5 V to ±15 V (SOIC-8) - compatible with legacy industrial and broadcast video rails. |
| Input Offset Voltage | 0.9 mV typical (±15 V) - ensures minimal DC error in precision gain blocks and differential receivers. |
| Supply Current | 5.3 mA typical - balances speed and power efficiency for space-constrained video modules. |
| Output Short-Circuit Current | ±54 mA sourcing/sinking - drives 75-Ω video lines and 100-Ω ADC inputs directly without external buffers. |
| Input-Referred Noise | 17 nV/√Hz at 10 kHz - preserves SNR in low-level analog front-ends before digitization. |
Pinout & Package
LM7121IM/NOPB uses an 8-pin SOIC (D) package measuring 4.902 mm × 3.912 mm, rated for −40°C to +85°C operation and RoHS-compliant with Sn lead finish and MSL Level-1 reflow profile.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Amplified signal output node; capable of ±54 mA drive into 75-Ω loads with <0.1% settling. |
| 2 | Negative Supply (V−) | Connects to −5 V or −15 V rail; defines lower output swing limit and bias point for dual-supply operation. |
| 3 | Non-inverting Input (+IN) | High-impedance (3.4 MΩ) input for reference or signal source; supports common-mode range up to ±13 V. |
| 4 | Inverting Input (−IN) | Feedback summing node; used with resistor networks to configure gain (AV = +1, +2, −1) per TI Figure 71–74. |
| 5 | Positive Supply (V+) | Connects to +5 V or +15 V rail; sets upper output swing limit and enables full dynamic range operation. |
| 6 | No Connection (N/C) | Internally unused pin; must remain unconnected per TI device documentation. |
| 7 | No Connection (N/C) | Internally unused pin; must remain unconnected per TI device documentation. |
| 8 | No Connection (N/C) | Internally unused pin; must remain unconnected per TI device documentation. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-feedback topology | Enables intuitive gain-setting with standard resistive feedback networks - no complex compensation required for AV ≥ +1. |
| Unlimited capacitive load drive | Stable with any output capacitance (e.g., long coaxial cables or ADC input capacitance), eliminating need for isolation resistors. |
| Tiny footprint compatibility | Shares pin-compatible layout with SOT-23-5 variant (LM7121IM5/NOPB), allowing scalable design reuse across board density tiers. |
| Wide supply range support | Operates from ±5 V to ±15 V without performance degradation - simplifies integration into mixed-voltage video subsystems. |
| Low distortion at high frequency | 0.065% THD at 1 MHz ensures accurate color signal reproduction in RGB and YUV video paths. |
Applications
| Scanners & Digital Copiers | PC Video Cards |
|---|---|
Use Scenario: Amplifying analog RGB signals from CCD sensors prior to digitization in high-resolution document scanners. IC Role / Device Role / Timing Role: High-bandwidth buffer and gain stage ensuring minimal phase shift and group delay across 20–100 MHz video spectrum. Use Value: 235-MHz bandwidth preserves edge sharpness and color fidelity in scanned images; 1300 V/μs slew rate prevents transient smearing during rapid pixel transitions. |
Use Scenario: Driving analog VGA outputs from GPU DACs to external monitors over 15-pin D-sub connectors. IC Role / Device Role / Timing Role: Line driver with 75-Ω impedance matching and DC-coupled output swing up to ±11 V. Use Value: Stable operation into 75-Ω loads eliminates termination artifacts; low THD (<0.1%) maintains color accuracy across full NTSC/PAL bandwidth. |
| Digital Cameras | Cable Drivers |
Use Scenario: Buffering image sensor analog outputs (e.g., from CMOS imagers) before ADC sampling in compact camera modules. IC Role / Device Role / Timing Role: Low-noise, high-slew-rate signal conditioner placed adjacent to sensor to minimize noise pickup and trace inductance effects. Use Value: 17 nV/√Hz input noise preserves dynamic range; tiny SOIC-8 footprint allows placement within 5 mm of sensor die. |
Use Scenario: Transmitting composite video or component video over 25-meter twisted-pair cables in set-top box or surveillance systems. IC Role / Device Role / Timing Role: Differential transmitter driver with adjustable gain and line compensation (per TI Figure 76). Use Value: 235-MHz bandwidth supports full HD resolution over distance; <1° differential phase error maintains color saturation and hue accuracy. |
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 |
|---|---|---|---|
| THS3091DR | Higher slew rate (2000 V/μs), wider bandwidth (210 MHz), but higher supply current (11.5 mA) and limited to ±15 V max. | Better suited for ultra-fast pulse amplification; less optimal for battery-powered portable video due to power draw. | Select THS3091DR when >1500 V/μs slew rate is mandatory and power budget allows ≥11 mA per channel. |
| LMH6702MA/NOPB | Wider bandwidth (1.7 GHz), higher supply current (12.5 mA), requires careful layout for stability; not characterized for unlimited capacitive loads. | Targeted at RF and IF signal chains; lacks guaranteed stability into large capacitive loads like long cables or ADC inputs. | Choose LMH6702MA/NOPB only for GHz-range small-signal amplification where load capacitance is ≤100 pF and layout is RF-optimized. |
Compared with THS3091DR and LMH6702MA/NOPB, the LM7121IM/NOPB offers the best balance of bandwidth (235 MHz), capacitive-load robustness, and low quiescent current (5.3 mA) for video line driving and ADC buffering - making it uniquely suitable for cost-sensitive, space-constrained, and thermally constrained video interface designs.
Availability
LM7121IM/NOPB is available at Aetrix Electronics and suitable for PC video cards, digital cameras, and cable driver applications requiring stable component supply, consistent parametric performance, and long-term industrial availability.
Supply support for LM7121IM/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 chain solutions.
The LM7121 product line was designed specifically for demanding video, imaging, and high-speed analog interface applications - prioritizing bandwidth, slew rate, and capacitive-load stability in compact packages.
FAQ
What is the maximum supply voltage for LM7121IM/NOPB in SOIC-8 package?
The LM7121IM/NOPB in SOIC-8 package supports dual-supply operation up to ±15 V (30 V total) and single-supply operation up to +30 V, as confirmed in TI's Application and Implementation section (Table 1). Operation beyond these limits risks permanent damage per Absolute Maximum Ratings.
Does LM7121IM/NOPB require external compensation for unity-gain stability?
LM7121IM/NOPB is unity-gain stable with unlimited capacitive loads and does not require external compensation under ±5 V or ±15 V supplies. However, for ±5 V to ±15 V operation above 6 V total supply, TI recommends adding a 510-Ω resistor and 3-pF capacitor in the feedback path (per Figure 73–74) to ensure stability across temperature.
Can LM7121IM/NOPB drive a 75-Ω video load directly?
Yes, LM7121IM/NOPB can directly drive a 75-Ω video load: its ±54 mA short-circuit current and 235-MHz bandwidth enable clean NTSC/PAL signal transmission. TI's Figure 76 demonstrates successful 25-meter twisted-pair driving with <1% differential gain error and <1° phase error using LM7121IM/NOPB.
What is the input common-mode voltage range for LM7121IM/NOPB at ±15 V supplies?
At ±15 V supplies, the LM7121IM/NOPB supports an input common-mode voltage range of −13 V to +13 V (CMRR ≥70 dB), as specified in Section 6.5 of the datasheet. This allows direct interfacing with signals referenced to ground or split rails without level-shifting circuitry.
How does LM7121IM/NOPB compare to LM7121IM5/NOPB in terms of performance?
LM7121IM/NOPB (SOIC-8) and LM7121IM5/NOPB (SOT-23-5) share identical electrical specifications including bandwidth, slew rate, and noise - but differ in supply range: SOIC-8 supports ±5 V to ±15 V, while SOT-23-5 is limited to ±5 V max. Pinout and thermal resistance (RθJA = 165°C/W vs. 325°C/W) also differ significantly.
LM7121IM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1300V/µs
- Gain Bandwidth Product:
- 175 MHz
- -3db Bandwidth:
- 235 MHz
- Current - Input Bias:
- 5.2 µA
- Voltage - Input Offset:
- 900 µV
- Current - Supply:
- 5.3mA
- Current - Output / Channel:
- 71 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 33 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM7121IM/NOPB FAQ
1.How can I place an order for LM7121IM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM7121IM/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 LM7121IM/NOPB reliable?
The price and inventory of LM7121IM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM7121IM/NOPB is usually 5 days.
3.What payment methods are accepted for LM7121IM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM7121IM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM7121IM/NOPB?
LM7121IM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM7121IM/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 LM7121IM/NOPB?
For technical support, including LM7121IM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM7121IM/NOPB requirements.
6.How does Aetrix verify that LM7121IM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM7121IM/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 LM7121IM/NOPB meets industry standards.
7.What is the process for return or replacement of LM7121IM/NOPB?
All LM7121IM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM7121IM/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 LM7121IM/NOPB part is unused and in its original packaging.
Return procedure for LM7121IM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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