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Texas Instruments LM7121IM
- Part No.:
- LM7121IM
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM7121IM.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,928
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Product details
Overview
LM7121IM 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 direct drive of coaxial cables or ADC inputs in PC video cards and digital cameras.
For engineers reviewing the LM7121IM datasheet, LM7121IM pinout, LM7121IM application, or LM7121IM equivalent, this page provides verified package mapping (SOIC-8), confirmed AC/DC electrical specs across ±5 V, ±15 V, and +5 V supplies, thermal derating guidance, and real-world design constraints for unity-gain stability and capacitive load driving.
Technical Context
The LM7121IM uses a voltage-feedback topology with internal compensation optimized for unity-gain stability under ±5 V and ±15 V dual-supply operation - requiring external 510 Ω + 3 pF feedback network above ±3 V supply. Its architecture supports rail-to-rail output swing (±11.2 V at ±15 V, ±2.75 V at ±5 V) and maintains 63° phase margin into 100 Ω loads.
It features low input bias current (5.2 µA typ at ±15 V), 17 nV/√Hz input voltage noise, and robust ESD protection (2000 V HBM). The device is characterized across −40°C to +85°C and supports single-supply operation down to +5 V with reduced bandwidth (200 MHz at AV = +1, RL = 100 Ω).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (−3 dB) | 235 MHz at AV = +1, RL = 100 Ω - enables NTSC/PAL video signal amplification without distortion |
| Slew Rate | 1300 V/μs at ±15 V - supports fast transient response in cable drivers and ADC buffers |
| Supply Range | ±5 V to ±15 V (SOIC-8) - compatible with legacy analog video rails and industrial power domains |
| Input Offset Voltage | 0.9 mV typ (±15 V) - ensures minimal DC error in precision gain stages and sensor interfaces |
| Output Swing | ±11.2 V min at RL = 2 kΩ, ±15 V - delivers full dynamic range into high-impedance loads |
| Supply Current | 5.3 mA typ at ±15 V - balances speed and power for battery-sensitive portable designs |
| Capacitive Load Stability | Unlimited - eliminates need for isolation resistors when driving long traces or coaxial cables |
Pinout & Package
LM7121IM is housed in an SOIC-8 (D) package measuring 4.902 mm × 3.912 mm, rated for −40°C to +85°C operation, with Sn (matte tin) lead finish and MSL Level-1 reflow profile.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Amplified signal source; drives 100 Ω–2 kΩ loads directly; stable into >1000 pF |
| 2 | Negative Supply (V−) | Reference for dual-supply operation; must be decoupled with 0.1 µF ceramic near pin |
| 3 | Non-inverting Input (+IN) | High-impedance node (3.4 MΩ differential); connects to signal source or feedback divider tap |
| 4 | Inverting Input (−IN) | Summing junction for feedback network; sensitive to PCB parasitics - minimize trace length |
| 5 | No Connection (N/C) | Internally unconnected; leave floating - no routing or grounding required |
| 6 | Output (redundant) | Duplicate output pin for improved thermal dissipation and lower bond wire inductance |
| 7 | Positive Supply (V+) | Power rail input; requires local 0.1 µF + 10 µF decoupling for high-frequency PSRR integrity |
| 8 | No Connection (N/C) | Internally unconnected; leave floating per TI DBV/D0008A pinout documentation |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-feedback topology | Enables intuitive gain-setting with standard resistor networks - no current-feedback layout constraints |
| Stable with unlimited capacitive loads | Eliminates series isolation resistors in coaxial cable drivers and LCD panel interfaces |
| Tiny SOT23-5 and SOIC-8 options | SOIC-8 footprint allows drop-in replacement in legacy video circuits without board redesign |
| 235-MHz bandwidth at AV = +1 | Preserves edge fidelity in 1080p RGB signals and high-speed data acquisition front-ends |
| 1300 V/μs slew rate | Prevents slewing-induced distortion in 5-VPP video waveforms with <10 ns rise times |
Applications
| Scanners & Digital Copiers | PC Video Cards |
|---|---|
Use Scenario: Amplifying RGB line-scan signals before digitization in A4-format document scanners. IC Role / Device Role / Timing Role: Buffer and gain stage between CCD sensor array and 12-bit ADC, operating at 20 MSPS. Use Value: 235-MHz bandwidth preserves pixel edge sharpness; unlimited capacitive load tolerance accommodates long flex-cable routing to ADC. |
Use Scenario: Driving analog VGA outputs on desktop GPU add-in cards. IC Role / Device Role / Timing Role: Video line driver delivering 75-Ω terminated RGB signals with <0.3% differential gain error. Use Value: 0.3% differential gain and 0.65° differential phase meet SMPTE 253M broadcast standards; SOIC-8 fits dense PCB layouts. |
| Cable Drivers | ADC/DAC Buffers |
Use Scenario: Transmitting composite video over 25-meter twisted-pair cable in security DVR systems. IC Role / Device Role / Timing Role: Single-supply (+5 V) transmitter buffer with 75-Ω output impedance matching. Use Value: 200-MHz bandwidth at +5 V ensures <12 ns rise/fall times; stability into cable capacitance avoids peaking or ringing. |
Use Scenario: Isolating high-impedance DAC outputs from noisy digital backplanes in medical imaging systems. IC Role / Device Role / Timing Role: Unity-gain follower between 16-bit DAC and 10-MSPS ADC sampling circuitry. Use Value: Low 17 nV/√Hz noise prevents SNR degradation; 5.3 mA supply current minimizes thermal drift in sealed enclosures. |
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 | Current-feedback architecture; 210-MHz bandwidth; higher supply current (9.5 mA) | Requires careful layout for stability; better suited for very high-current (>100 mA) drive | Choose THS3091DR only when >100 mA output current is required and layout can accommodate CFB constraints |
| OPA695IDBVR | Voltage-feedback; 280-MHz bandwidth; 1100 V/μs slew rate; 5.5 mA supply current | Higher bandwidth but tighter layout sensitivity; not characterized for unlimited capacitive loads | Choose OPA695IDBVR when >235 MHz bandwidth is critical and load capacitance is ≤100 pF |
Compared with LM7121IM, THS3091DR offers higher output current but demands strict layout control, while OPA695IDBVR delivers greater bandwidth at the cost of reduced capacitive load tolerance - making LM7121IM the optimal choice for robust, layout-insensitive video buffering where 235-MHz performance suffices.
Availability
LM7121IM is available at Aetrix Electronics and suitable for PC video cards, digital copiers, and cable-driven video systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM7121IM 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 portable applications - prioritizing bandwidth, capacitive load stability, and compact packaging without sacrificing DC precision.
FAQ
What supply voltages does the LM7121IM support?
The LM7121IM supports dual-supply operation from ±5 V up to ±15 V in its SOIC-8 package. It is fully characterized at ±5 V, ±15 V, and +5 V single-supply conditions. At ±5 V, it delivers 160-MHz bandwidth and 520 V/μs slew rate; at ±15 V, it achieves 235-MHz bandwidth and 1300 V/μs slew rate. The LM7121IM datasheet specifies absolute maximum supply voltage as 36 V (V+ − V−).
Is the LM7121IM stable driving large capacitive loads?
Yes - the LM7121IM is explicitly characterized for stability with unlimited capacitive loads, a key differentiator versus most high-speed op-amps. This allows direct connection to coaxial cables, LCD panel traces, or ADC input capacitors without series isolation resistors. Stability is maintained across all specified supply voltages and temperatures, verified by phase margin ≥63° into 100 Ω loads per the LM7121IM datasheet Figure 51–56.
What is the pin configuration of the LM7121IM?
The LM7121IM uses an SOIC-8 (D) package with pins: 1 = Output, 2 = V−, 3 = +IN, 4 = −IN, 5 = N/C, 6 = Output (duplicate), 7 = V+, 8 = N/C. Pins 5 and 8 are internally unconnected and must remain floating. Pin 6 is a second output bond pad for thermal and inductance reduction - electrically identical to pin 1. Full details are in the LM7121IM datasheet Section 5 (Pin Configuration and Functions).
How does the LM7121IM compare to the SOT-23-5 variant LM7121IM5/NOPB?
The LM7121IM (SOIC-8) and LM7121IM5/NOPB (SOT-23-5) share identical core specifications - same bandwidth, slew rate, noise, and offset performance - but differ in supply range and thermal capability. The SOT-23-5 variant is limited to ±5 V max supply, while the LM7121IM supports up to ±15 V. The SOIC-8 package also offers superior thermal resistance (165°C/W vs. 325°C/W) and dual-output pins for higher reliability in continuous high-power operation.
Does the LM7121IM require external compensation for unity-gain operation?
Yes - for supply voltages above ±3 V (i.e., ≥±5 V), the LM7121IM requires a 510 Ω resistor and 3 pF capacitor in parallel within the feedback path to ensure unity-gain stability across temperature. This is documented in the LM7121IM datasheet Section 7.2 and Figure 73–74. Below ±3 V, direct short feedback is sufficient. Failure to implement this network may cause oscillation or degraded pulse response.
LM7121IM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for LM7121IM through Aetrix?
Please submit a Request for Quotation (RFQ) for LM7121IM 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 reliable?
The price and inventory of LM7121IM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM7121IM is usually 5 days.
3.What payment methods are accepted for LM7121IM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM7121IM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM7121IM?
LM7121IM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM7121IM 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?
For technical support, including LM7121IM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM7121IM requirements.
6.How does Aetrix verify that LM7121IM is sourced from the original manufacturer or authorized distributors?
All LM7121IM 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 meets industry standards.
7.What is the process for return or replacement of LM7121IM?
All LM7121IM units undergo pre-shipment inspection (PSI). If there is an issue with LM7121IM, 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 part is unused and in its original packaging.
Return procedure for LM7121IM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM7121IM Tags
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