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Texas Instruments LM118H
- Part No.:
- LM118H
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-99-8 Metal Can
- Datasheet:
-
LM118H.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT TO99-8
- Quantity:
- Payment:
- Shipping:
Inventory:152
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Product details
Overview
LM118H from Texas Instruments is a precision high-speed operational amplifier in TO-99 metal can package, delivering 15 MHz small-signal bandwidth, 50 V/μs minimum slew rate, and ±5 V to ±20 V dual supply operation. It features internal unity-gain compensation, input/output overload protection, and operates across −55°C to +125°C - designed for military-grade A/D converters, active filters, and fast sample-and-hold circuits.
For engineers reviewing the LM118H datasheet, LM118H pinout, LM118H application, or LM118H equivalent, this page provides verified technical context, military-spec thermal and electrical parameters, TO-99 pin mapping, real-world application cards, and two validated alternative op-amps with documented functional and temperature-range differences.
Technical Context
The LM118H uses internally compensated bipolar transistor architecture optimized for wide bandwidth without DC performance trade-offs. Its unity-gain stable design supports feedforward compensation to boost inverting slew rate beyond 150 V/μs and reduce 0.1% settling time to under 1 μs with external capacitor tuning.
It integrates back-to-back input diodes for differential voltage protection up to ±1 V, internal current limiting, and rail-to-rail output swing capability (±12 V into 2 kΩ at ±15 V supplies). Input bias current remains ≤250 nA at 25°C, enabling high-impedance sensor interface applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth | 15 MHz - enables stable closed-loop gain at high frequencies for active filter and oscillator designs |
| Slew Rate | 50 V/μs min - supports fast transient response in pulse amplification and sample-and-hold buffer stages |
| Supply Voltage Range | ±5 V to ±20 V - accommodates industrial and military power rails without external regulation |
| Operating Temperature | −55°C to +125°C - qualified per RETS118X military specification for aerospace and defense systems |
| Input Bias Current | 250 nA max at 25°C - preserves signal integrity in high-Z transducer and photodiode amplifier interfaces |
| Input Offset Voltage | 4 mV max at 25°C - ensures low DC error in precision instrumentation amplifier front-ends |
| Large-Signal Voltage Gain | 50 V/mV min - delivers high open-loop gain for accurate closed-loop gain setting in feedback networks |
Pinout & Package
LM118H is housed in an 8-pin TO-99 metal can package (TI package code LMC), hermetically sealed for high-reliability military environments. The package features a center tab connected to Pin 4 (V–) and requires proper heat sinking for continuous operation above 100 mW dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null | Connects to external potentiometer for input offset voltage trimming; critical for DC-coupled precision applications |
| 2 | Inverting Input (−) | Differential input node; protected by internal back-to-back diodes limiting differential voltage to ±1 V |
| 3 | Non-Inverting Input (+) | Differential input node; common-mode input range extends to ±11.5 V at ±15 V supplies |
| 4 | V– (Negative Supply) | Primary negative supply terminal; also connected to metal can for EMI shielding and thermal conduction |
| 5 | Offset Null | Second terminal of offset null network; used with Pin 1 to balance input stage quiescent current mismatch |
| 6 | Output | Class-A/B output stage capable of ±12 V swing into 2 kΩ; includes short-circuit protection and thermal shutdown |
| 7 | V+ (Positive Supply) | Primary positive supply terminal; bypassing with 0.1 μF ceramic capacitor required for stability |
| 8 | NC / Can Ground | No internal connection; tied to metal can for mechanical mounting and EMI suppression |
Key Features
| Feature | Design Value |
|---|---|
| Internal Unity-Gain Compensation | Enables stable operation without external components while allowing optional feedforward or overcompensation for bandwidth/speed optimization |
| Input/Output Overload Protection | Prevents latch-up or damage during transient overvoltage or output short-circuit events - supports robust field-deployed instrumentation |
| Military Temperature Range | −55°C to +125°C operation verified per RETS118X spec - suitable for avionics, missile guidance, and downhole electronics |
| High Slew Rate + Wide Bandwidth | 50 V/μs min slew rate with 15 MHz bandwidth delivers 10× AC performance improvement over LM709-class op-amps |
| Pin Compatibility | Direct replacement for legacy LM709 and LM101 in TO-99 footprint - simplifies upgrade paths in existing military hardware |
Applications
| High-Speed Data Acquisition | Avionics Signal Conditioning |
|---|---|
|
Use Scenario: Buffering analog outputs from 12-bit SAR ADCs in real-time flight control systems. IC Role / Device Role / Timing Role: High-fidelity voltage follower with <1 μs 0.1% settling time, minimizing conversion error due to source impedance. Use Value: Maintains ±12 V output swing and 50 V/μs slew rate across −55°C to +125°C, ensuring consistent sampling accuracy in extreme thermal environments. |
Use Scenario: Amplifying low-level accelerometer and gyroscope signals in inertial measurement units (IMUs). IC Role / Device Role / Timing Role: Precision non-inverting amplifier with 250 nA max input bias current to avoid loading high-impedance MEMS sensor outputs. Use Value: Delivers 4 mV max input offset voltage and 80 dB min CMRR, preserving DC stability and dynamic range in closed-loop stabilization loops. |
| Active Filter for Radar IF Stages | Military-Grade Oscillator Core |
|
Use Scenario: Implementing 2nd-order bandpass filters in X-band radar intermediate frequency (IF) chains. IC Role / Device Role / Timing Role: High-Q active filter stage using dual LM118H in state-variable topology with precise pole placement. Use Value: 15 MHz bandwidth and low phase distortion enable sharp roll-off and minimal group delay variation across operating temperature extremes. |
Use Scenario: Building Wien bridge oscillators for calibration signal generation in field-test equipment. IC Role / Device Role / Timing Role: Low-distortion amplifier sustaining stable 10 kHz–1 MHz sinusoidal output with amplitude control via thermistor network. Use Value: Internal compensation and 50 V/μs slew rate suppress harmonic content and support rapid amplitude recovery after load transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM218H | Identical electrical specs but rated only from −25°C to +85°C; same TO-99 package and pinout | Not qualified for extended military temperature range; unsuitable for space or engine bay deployments | Select LM218H only when full −55°C to +125°C operation is not required and cost reduction is prioritized |
| LM318M/NOPB | SOIC-8 package; identical 15 MHz/50 V/μs specs but rated 0°C to +70°C; RoHS-compliant lead finish | Lacks hermetic sealing and thermal robustness; incompatible with through-hole military PCB layouts | Choose LM318M/NOPB for commercial-grade surface-mount designs where reflow compatibility and RoHS compliance are mandatory |
Compared with LM218H and LM318M/NOPB, the LM118H uniquely combines military-grade temperature range, hermetic TO-99 packaging, and proven reliability in radiation-tolerant analog signal chains - making it irreplaceable in mission-critical defense platforms where environmental resilience outweighs cost or footprint constraints.
Availability
LM118H is available at Aetrix Electronics and suitable for high-reliability aerospace, defense electronics, and industrial test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM118H 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 high-reliability components for industrial, automotive, and defense markets.
The LM118H belongs to TI's legacy high-speed precision op-amp family, engineered specifically for military and aerospace applications demanding guaranteed performance across −55°C to +125°C with hermetic packaging and rigorous screening.
FAQ
What is the maximum operating temperature range for the LM118H?
The LM118H is specified to operate continuously from −55°C to +125°C, meeting MIL-PRF-38535 requirements per RETS118X military specification. This extended range is validated through temperature cycling, burn-in, and parametric testing - distinguishing it from commercial variants like LM318-N (0°C to +70°C) and industrial LM218-N (−25°C to +85°C). The LM118H maintains 50 V/μs slew rate and 15 MHz bandwidth across this full range when properly heatsinked.
Does the LM118H require external compensation capacitors?
No - the LM118H features internal unity-gain frequency compensation, enabling stable operation without external components in standard configurations. However, external feedforward compensation (e.g., capacitor from output to inverting input) can be added to increase inverting slew rate beyond 150 V/μs, and overcompensation capacitors may be used to improve phase margin in high-gain or capacitive-load scenarios. These modifications are optional and application-specific, not required for basic functionality of the LM118H.
Is the LM118H pin-compatible with other TO-99 op-amps?
Yes - the LM118H uses the standard 8-pin TO-99 pinout (per JEDEC MO-002) and is pin-compatible with LM709, LM101, and LM201 in the same package. Pin 1 and 5 serve offset null, Pins 2 and 3 are inputs, Pin 4 is V–/can ground, Pin 6 is output, Pin 7 is V+, and Pin 8 is no-connect/can ground. This allows drop-in replacement in legacy military designs without PCB modification, provided thermal and decoupling requirements are met for the LM118H's higher speed.
What is the input protection scheme used in the LM118H?
The LM118H incorporates back-to-back silicon diodes between its inverting and non-inverting inputs, limiting differential input voltage to approximately ±1 V. This prevents damage from electrostatic discharge or transient overvoltage but requires external series resistance if differential input voltages exceed this threshold. Input common-mode range is ±11.5 V at ±15 V supplies, and absolute maximum input voltage equals supply voltage for VS < ±15 V. These protections are integral to the LM118H die structure and do not rely on external components.
Can the LM118H drive capacitive loads directly?
No - the LM118H is not inherently stable driving large capacitive loads (>100 pF) without isolation. Figure 40 in the official datasheet recommends inserting a small series resistor (e.g., 10 Ω to 100 Ω) between the LM118H output and the capacitive load to maintain phase margin. For loads exceeding 500 pF, a dedicated buffer stage or RC isolation network is required. Failure to isolate may cause peaking, ringing, or oscillation - especially critical in high-speed sample-and-hold or active filter applications using the LM118H.
LM118H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-99-8 Metal Can
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 70V/µs
- Gain Bandwidth Product:
- 15 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 120 nA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-99-8
LM118H FAQ
1.How can I place an order for LM118H through Aetrix?
Please submit a Request for Quotation (RFQ) for LM118H 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 LM118H reliable?
The price and inventory of LM118H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM118H is usually 5 days.
3.What payment methods are accepted for LM118H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM118H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM118H?
LM118H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM118H 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 LM118H?
For technical support, including LM118H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM118H requirements.
6.How does Aetrix verify that LM118H is sourced from the original manufacturer or authorized distributors?
All LM118H 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 LM118H meets industry standards.
7.What is the process for return or replacement of LM118H?
All LM118H units undergo pre-shipment inspection (PSI). If there is an issue with LM118H, 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 LM118H part is unused and in its original packaging.
Return procedure for LM118H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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