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Texas Instruments LF412MH
- Part No.:
- LF412MH
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-99-8 Metal Can
- Datasheet:
-
LF412MH.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT TO99-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,417
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Product details
Overview
LF412MH from Texas Instruments is a military-grade, low-offset, low-drift dual JFET-input operational amplifier in TO-can package, featuring 1 mV max input offset voltage, 7 µV/°C typical offset drift, and 10 V/µs minimum slew rate. It operates across −55°C to +125°C and is used in precision analog signal conditioning within aerospace data acquisition systems.
For engineers reviewing the LF412MH datasheet, LF412MH pinout, LF412MH application, or LF412MH equivalent, key selection criteria include its JFET-input architecture for ultra-low bias current (50 pA), wide gain-bandwidth product (3 MHz min), high input impedance (10¹² Ω), and military temperature range qualification per RETS412X specifications.
Technical Context
The LF412MH implements a dual-channel, internally trimmed BI-FET II™ architecture with matched high-voltage JFET differential pairs, enabling precise DC performance and fast transient response. Its input stage tolerates differential voltages up to ±30 V independent of supply rails, and it supports operation down to ±5 V supplies while maintaining specified AC performance.
Each amplifier features independent zener biasing for stable operation across temperature and supply variations, with common-mode input range extending to the negative rail and up to the positive supply. Output swing reaches ±12 V into 10 kΩ at ±15 V supplies, and the device includes built-in current limiting on both output polarities.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 1 mV (max) - enables sub-millivolt DC accuracy in precision instrumentation front-ends without external trimming. |
| Slew Rate | 10 V/µs (min) - supports clean amplification of fast-rising signals such as DAC outputs or pulse-conditioned sensor data. |
| Gain-Bandwidth Product | 3 MHz (min) - allows stable closed-loop gains up to ~300 at 10 kHz, suitable for anti-aliasing and active filtering. |
| Input Bias Current | 50 pA (typ) - minimizes voltage error in high-impedance transducer interfaces like piezoelectric sensors or photodiode amps. |
| Supply Current | 3.6 mA total (1.8 mA/amplifier) - enables low-power operation in battery-backed or thermally constrained avionics modules. |
| Input Impedance | 10¹² Ω - preserves signal integrity in charge-sensitive circuits and prevents loading of high-Z sources. |
| Operating Temperature | −55°C to +125°C - qualified for deployment in uncontrolled environmental zones of military platforms and space-qualified subsystems. |
Pinout & Package
LF412MH is housed in a hermetically sealed TO-99 metal can (Package Number NEV0008A), 9.14 mm diameter, with center-tab grounding and axial lead configuration optimized for thermal dissipation and EMI resilience in high-reliability analog stages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output A | Amplifier A output node; capable of ±12 V swing into 10 kΩ load at ±15 V supplies. |
| 2 | Inverting Input A | Differential input terminal for Amplifier A; accepts common-mode voltages down to V− rail. |
| 3 | Non-Inverting Input A | Differential input terminal for Amplifier A; matches Pin 2 in offset and bias current for precision configurations. |
| 4 | V− | Negative supply connection; also serves as thermal and EMI reference plane via metal can base. |
| 5 | Non-Inverting Input B | Differential input terminal for Amplifier B; electrically isolated but thermally coupled to Amplifier A for matched drift. |
| 6 | Inverting Input B | Differential input terminal for Amplifier B; shares same JFET process and layout symmetry as Pins 2 and 3. |
| 7 | Output B | Amplifier B output node; fully independent channel with identical AC/DC specs to Output A. |
| 8 | V+ | Positive supply connection; decoupling capacitor must be placed <1 cm from this pin per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Internally trimmed offset voltage | 1 mV max eliminates need for external nulling circuitry in production test and field calibration. |
| JFET input stage | 50 pA typical input bias current enables direct interfacing with high-impedance sensors without guard rings or bootstrapping. |
| Low 1/f noise corner | 50 Hz corner frequency ensures minimal low-frequency drift in DC-coupled integrators and precision hold circuits. |
| Fast settling to 0.01% | 2 µs settling time supports high-throughput sample-and-hold operation in 500 kSPS data acquisition systems. |
| Military specification compliance | Qualified per RETS412X for screening, burn-in, and extended temperature operation - required for DoD procurement. |
Applications
| Aerospace Data Acquisition | Precision Thermocouple Conditioning |
|---|---|
|
Use Scenario: Analog front-end for multi-channel flight control sensor monitoring under vibration and thermal cycling. IC Role / Device Role / Timing Role: Dual-channel signal conditioner performing cold-junction compensation, gain scaling, and low-noise buffering before ADC sampling. Use Value: 7 µV/°C offset drift and −55°C to +125°C operation ensure measurement stability across aircraft envelope without recalibration. |
Use Scenario: Signal conditioning for Type-K thermocouples in engine health monitoring units. IC Role / Device Role / Timing Role: Low-drift instrumentation amplifier core with programmable gain and offset correction. Use Value: 1 mV max offset voltage and 50 pA bias current prevent thermocouple self-heating errors and maintain <0.5°C accuracy over full range. |
| Military Radar Pulse Amplification | Secure Communications Baseband Filtering |
|
Use Scenario: Wideband IF amplification stage in ground-based radar receivers requiring phase coherence and low distortion. IC Role / Device Role / Timing Role: High-slew-rate buffer and active filter driver in 1–10 MHz intermediate frequency chain. Use Value: 10 V/µs slew rate and ≤0.02% THD preserve pulse fidelity and minimize timing jitter in pulse-compression processing. |
Use Scenario: Low-noise, low-distortion active filter in encrypted voice/data modems operating in harsh RF environments. IC Role / Device Role / Timing Role: Dual op-amp implementing 4th-order elliptic low-pass and notch rejection filters. Use Value: 3 MHz GBW and 10¹² Ω input impedance enable sharp roll-off and minimal passband droop without loading preceding stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual JFET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LF412CN | Commercial-grade (0°C to +70°C), PDIP-8 package, 3 mV max VOS vs. 1 mV for LF412MH. | Limited to benign-environment industrial controls; lacks military screening and extended temperature capability. | Select when cost sensitivity outweighs environmental robustness and long-term DC stability requirements. |
| OPA2111KP | Higher precision (25 µV VOS), lower noise (11 nV/√Hz), but only 1.2 MHz GBW and no military temp rating. | Better for ultra-low-noise audio or medical instrumentation; unsuitable for high-speed or wide-temp military use. | Choose only if sub-100 µV offset and nanovolt noise dominate over speed, temperature range, and rugged packaging. |
Compared with LF412CN and OPA2111KP, the LF412MH uniquely combines military temperature range, TO-can hermetic reliability, 1 mV offset, and 10 V/µs slew rate-making it irreplaceable in deployed defense electronics where simultaneous precision, speed, and survivability are non-negotiable.
Availability
LF412MH is available at Aetrix Electronics and suitable for aerospace data acquisition, military radar signal chains, and secure communications baseband filtering requiring stable component supply across extended lifecycle programs.
Supply support for LF412MH 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 heritage in high-reliability op amp design and military qualification.
The LF412MH belongs to TI's legacy BI-FET II™ JFET op amp family, engineered specifically for precision analog signal conditioning in defense, aerospace, and industrial systems demanding wide temperature operation and long-term DC stability.
FAQ
What is the maximum operating temperature range for the LF412MH?
The LF412MH is rated for operation from −55°C to +125°C, meeting military environmental requirements per RETS412X specifications. This range is enabled by its TO-99 metal-can package and internal zener-biased JFET architecture, which maintains stable offset and bias current behavior across extreme thermal gradients encountered in airborne and ground vehicle platforms. The LF412MH achieves this without derating its 10 V/µs slew rate or 3 MHz gain-bandwidth product.
Does the LF412MH require external offset nulling circuitry?
No, the LF412MH does not require external offset nulling circuitry because it features internal trimming that guarantees a maximum input offset voltage of 1 mV at 25°C. This specification holds across the full −55°C to +125°C operating range with a typical drift of only 7 µV/°C. The internal BI-FET II™ trimming eliminates the need for potentiometers or laser-trimmed resistors in production designs, reducing bill-of-materials cost and improving long-term reliability of the LF412MH in field-deployed systems.
How does the LF412MH compare to the LM1558 in terms of pin compatibility and performance?
The LF412MH is pin-compatible with the LM1558 in the TO-99 package configuration, allowing direct replacement in legacy military designs. However, the LF412MH delivers significantly improved performance: 10 V/µs slew rate versus 0.5 V/µs, 3 MHz gain-bandwidth versus 1 MHz, and 50 pA input bias current versus 80 nA. These enhancements make the LF412MH suitable for modern high-speed data acquisition where the LM1558 would introduce unacceptable distortion or settling delay. The LF412MH retains identical pinout and supply requirements, simplifying upgrade paths.
What is the recommended power supply decoupling for the LF412MH?
Texas Instruments recommends placing a 0.1 µF ceramic capacitor as close as possible to each supply pin (Pins 4 and 8) of the LF412MH, with short, low-inductance traces to the ground plane. For systems with noisy power rails, a second-stage RC filter (e.g., 10 Ω series resistor + 10 µF tantalum) upstream of the 0.1 µF cap improves PSRR above 100 kHz. This decoupling strategy is critical for maintaining the LF412MH's 100 dB PSRR and preventing oscillation in high-gain configurations, especially given its 3 MHz bandwidth and JFET input sensitivity to supply transients.
Is the LF412MH suitable for single-supply operation?
The LF412MH is not optimized for true single-supply operation because its input common-mode range does not extend to the positive rail under all conditions, and its output cannot swing rail-to-rail. While it can function with a single +15 V supply and ground reference (with inputs biased above ground), TI specifies guaranteed performance only for dual-supply operation (±5 V to ±15 V). For reliable DC-coupled single-supply applications, level-shifting networks or rail-to-rail op amps are preferred. The LF412MH's design intent remains dual-supply precision analog signal conditioning, as confirmed in its RETS412X military specification and LF412-N datasheet.
LF412MH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-99-8 Metal Can
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 15V/µs
- Gain Bandwidth Product:
- 4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 3.6mA (x2 Channels)
- 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
LF412MH FAQ
1.How can I place an order for LF412MH through Aetrix?
Please submit a Request for Quotation (RFQ) for LF412MH 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 LF412MH reliable?
The price and inventory of LF412MH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF412MH is usually 5 days.
3.What payment methods are accepted for LF412MH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF412MH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF412MH?
LF412MH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF412MH 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 LF412MH?
For technical support, including LF412MH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF412MH requirements.
6.How does Aetrix verify that LF412MH is sourced from the original manufacturer or authorized distributors?
All LF412MH 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 LF412MH meets industry standards.
7.What is the process for return or replacement of LF412MH?
All LF412MH units undergo pre-shipment inspection (PSI). If there is an issue with LF412MH, 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 LF412MH part is unused and in its original packaging.
Return procedure for LF412MH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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