My Inquiry
My Account
Texas Instruments LF198AH/NOPB
- Part No.:
- LF198AH/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-99-8 Metal Can
- Datasheet:
-
LF198AH/NOPB.pdf
- Description:
- IC SAMPL/HOLD 1 CIRCUIT TO99-8
- Quantity:
- Payment:
- Shipping:
Inventory:359
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LF198AH/NOPB from Texas Instruments is a monolithic BI-FET sample-and-hold IC operating as a unity-gain follower with 0.002% typical DC gain accuracy, ≤10 µs acquisition time to 0.1%, and 0.5 mV typical hold step at 0.01 µF hold capacitance. It supports ±5 V to ±18 V dual supplies and delivers ultrahigh DC accuracy for precision data acquisition in aerospace-grade analog signal conditioning.
For engineers reviewing the LF198AH/NOPB datasheet, LF198AH/NOPB pinout, LF198AH/NOPB application, or LF198AH/NOPB equivalent, this device is selected for high-stability sampling in ADC front-ends, synchronous correlators, and programmable integrators where low droop (<5 mV/min), high input impedance (1010 Ω), and logic-compatible TTL/CMOS control are required.
Technical Context
The LF198AH/NOPB uses a bipolar input stage combined with P-channel JFET output devices to achieve low offset voltage (1 mV typ), wide bandwidth (enabling stable inclusion inside 1-MHz op-amp feedback loops), and low noise in hold mode. Its differential logic interface has a 1.4 V threshold and accepts TTL, PMOS, and CMOS signals without level-shifting.
Hold mode isolation is ensured by zero feedthrough from input to output-even with input signals at supply rails-while the dedicated OFFSET ADJUST pin enables DC offset trimming without degrading drift performance. Input impedance remains constant during hold, and supply rejection exceeds 90 dB across sample and hold modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±5 V to ±18 V - supports industrial and military-grade dual-rail systems without external regulation |
| Acquisition Time (to 0.1%) | 4–6 µs (Ch = 1000 pF); 20–25 µs (Ch = 0.01 µF) - enables high-speed sampling in multi-channel DAQ |
| Hold Step | 0.5 mV typical (Ch = 0.01 µF, VOUT = 0) - critical for sub-12-bit accuracy in precision ADC interfaces |
| Input Impedance | 1010 Ω - allows direct connection to high-impedance sensors without loading or accuracy loss |
| Gain Error | 0.002% typical (25°C), 0.01% max over full temperature range - ensures traceable DC calibration in metrology |
| Leakage Current (Hold Mode) | 30–100 pA (25°C) - limits droop to <5 mV/min with 1 µF capacitor, enabling >100 ms hold duration |
| Logic Threshold | 0.8–2.4 V differential - compatible with TTL, CMOS, and op-amp logic drive without external biasing |
Pinout & Package
LF198AH/NOPB is housed in a hermetically sealed TO-99 metal can package (9.08 mm × 9.08 mm), rated for –55°C to +125°C operation and qualified to MIL-STD-38510 (JM38510/12501SGA). This package provides superior thermal stability and EMI immunity for space and defense applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive Supply | Accepts +5 V to +18 V; powers internal bipolar and JFET stages |
| OFFSET ADJUST | DC Offset Compensation | Single-pin trim for input offset voltage without affecting drift or bandwidth |
| INPUT | Analog Input | High-impedance (1010 Ω) node; maintains integrity during hold via input-stage isolation |
| V– | Negative Supply | Accepts –5 V to –18 V; symmetrical rail support enables true bipolar signal handling |
| OUTPUT | Analog Output | Low-impedance (≤1 Ω typ in hold mode) buffer drives ADC inputs or downstream amplifiers directly |
| Ch | Hold Capacitor Terminal | Direct connection point for external capacitor; series 300 Ω on-chip resistor limits charge current |
| LOGIC REFERENCE | Logic Reference Input | Differential reference for LOGIC pin; sets common-mode baseline for TTL/CMOS compatibility |
| LOGIC | Sample/Hold Control | Active-high logic input: high = sample (output tracks input), low = hold (output freezes) |
Key Features
| Feature | Design Value |
|---|---|
| BI-FET Process Architecture | Combines bipolar input stage (low offset, wide bandwidth) with JFET output stage (low noise, low droop) |
| No Feedthrough in Hold Mode | Zero coupling from INPUT to OUTPUT even when input equals supply rails - eliminates hold-mode corruption |
| Stable Inside 1-MHz Op-Amp Loops | Wide bandwidth and phase margin allow direct integration into fast servo or filter feedback paths |
| Logic-Compatible Differential Interface | 1.4 V threshold with ±30 V differential tolerance - accepts TTL, CMOS, and op-amp logic without clamping diodes |
| Input Characteristics Unchanged in Hold | Input impedance, offset, and bias current remain identical in both sample and hold modes - simplifies system modeling |
Applications
| ADC Front-End Sampling | Synchronous Correlator |
|---|---|
|
Use Scenario: Capturing transient analog waveforms before digitization in high-resolution data acquisition systems. IC Role / Device Role / Timing Role: Precision sample-and-hold amplifier synchronizing with ADC conversion trigger to freeze analog input at exact sampling instant. Use Value: 0.5 mV typical hold step and 0.002% gain error preserve DC accuracy for 14+ bit conversion; low droop extends effective aperture time. |
Use Scenario: Multiplying two analog signals and integrating the product over time to extract correlation peaks. IC Role / Device Role / Timing Role: Holding the instantaneous product output during integration window to eliminate switching transients. Use Value: Zero feedthrough and stable input impedance ensure no signal leakage into hold path, maintaining cross-talk-free correlation fidelity. |
| Programmable Integrator Reset | Ramp Generator with Variable Level |
|
Use Scenario: Building resettable integrators where integration period and final voltage are digitally controlled. IC Role / Device Role / Timing Role: Latching integrator output at precise reset timing to define initial condition for next integration cycle. Use Value: 4–6 µs acquisition enables rapid re-sampling after reset; low leakage (≤100 pA) prevents drift during hold-integration intervals. |
Use Scenario: Generating linear voltage ramps with user-defined start/stop levels in function generators or test equipment. IC Role / Device Role / Timing Role: Capturing and holding reference voltages to set ramp boundaries while oscillator controls slope timing. Use Value: High supply rejection (>90 dB) rejects power rail noise that would distort ramp linearity; wide supply range supports multi-range outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sample-and-hold applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LF398N/NOPB | Higher input offset (2–7 mV), wider temp range (0°C to 70°C), lower cost; same pinout and architecture | Targeted at commercial-grade instrumentation where ±10 mV offset is acceptable | Select when budget constraints outweigh need for aerospace-grade drift and accuracy |
| AD585JN | Monolithic laser-trimmed design; 0.001% gain error, 0.25 µs acquisition, but requires ±15 V only and lacks logic-compatible interface | Used in ultra-high-precision lab equipment requiring sub-16-bit linearity and faster settling | Choose when acquisition speed and absolute gain accuracy supersede logic flexibility and wide supply range |
Compared with LF398N/NOPB, LF198AH/NOPB offers tighter offset and drift specs for extended temperature operation; versus AD585JN, it trades raw speed and laser trimming for integrated logic control and broader supply adaptability-making it optimal for ruggedized, digitally synchronized sampling.
Availability
LF198AH/NOPB is available at Aetrix Electronics and suitable for aerospace avionics, defense radar signal processing, and high-reliability industrial data acquisition requiring stable component supply across extended temperature and long lifecycle programs.
Supply support for LF198AH/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 heritage in precision analog ICs for mission-critical systems.
The LFx98x product line was designed specifically for high-fidelity sample-and-hold applications in defense, space, and metrology-emphasizing DC accuracy, hold-mode integrity, and robust logic interfacing under extreme environmental conditions.
FAQ
What is the maximum recommended hold capacitor value for LF198AH/NOPB?
The LF198AH/NOPB datasheet does not specify an absolute maximum hold capacitor value, but practical limits arise from acquisition time and droop trade-offs. With Ch = 1 µF, acquisition time increases to ~25 µs and droop drops to <5 mV/min. Larger values (e.g., 10 µF) further reduce droop but risk excessive charging current heating and reduced bandwidth. TI recommends staying within 0.001 µF to 1 µF for most applications, validated in Figure 4 (Droop Rate) and Figure 6 (Hold Settling Time).
Does LF198AH/NOPB support single-supply operation?
No, LF198AH/NOPB requires dual symmetric supplies (±5 V to ±18 V) and is not specified for single-supply use. Its internal BI-FET architecture relies on balanced positive and negative rails to maintain input stage linearity, offset stability, and hold-mode isolation. Attempting single-supply operation violates Absolute Maximum Ratings and will cause distortion, increased hold step, or latch-up.
How does the OFFSET ADJUST pin function in LF198AH/NOPB?
The OFFSET ADJUST pin on LF198AH/NOPB connects to a 1-kΩ potentiometer (V+ to wiper to ground via resistor) to null input offset voltage. Unlike conventional trim methods, this adjustment does not degrade input offset drift or bandwidth because it operates on a dedicated internal node decoupled from the high-impedance input stage. The LF198AH/NOPB datasheet specifies 1 mV typical offset after trim at 25°C, with 2 mV max over full temperature range.
Can LF198AH/NOPB be used with ceramic hold capacitors?
Yes-but only with C0G/NPO-type ceramics, which exhibit low dielectric absorption (<0.1%) and stable capacitance vs. voltage/temperature. Standard X7R or Y5V ceramics introduce >1% hysteresis and voltage coefficient errors, degrading hold-step accuracy and causing sag after release. TI's Application Note (Section 9.1.1) explicitly recommends polystyrene, polypropylene, Teflon, or C0G/NPO ceramics for precision hold applications using LF198AH/NOPB.
What is the logic rise-time requirement for reliable LF198AH/NOPB operation?
LF198AH/NOPB requires a minimum dV/dt of 1.0 V/µs on the LOGIC input to minimize hold-step error. Slower edges increase aperture uncertainty and induce additional step error due to threshold ambiguity. This is verified in Section 9.1.3 of the datasheet, which states that logic signals below this slew rate cause excessive hold step - especially critical when sampling fast-moving or high-dV/dt analog signals. External Schmitt-trigger buffers are recommended if source logic is marginal.
LF198AH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-99-8 Metal Can
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- Sample and Hold
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 nA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 4.5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-99-8
LF198AH/NOPB FAQ
1.How can I place an order for LF198AH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LF198AH/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 LF198AH/NOPB reliable?
The price and inventory of LF198AH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF198AH/NOPB is usually 5 days.
3.What payment methods are accepted for LF198AH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF198AH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF198AH/NOPB?
LF198AH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF198AH/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 LF198AH/NOPB?
For technical support, including LF198AH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF198AH/NOPB requirements.
6.How does Aetrix verify that LF198AH/NOPB is sourced from the original manufacturer or authorized distributors?
All LF198AH/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 LF198AH/NOPB meets industry standards.
7.What is the process for return or replacement of LF198AH/NOPB?
All LF198AH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LF198AH/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 LF198AH/NOPB part is unused and in its original packaging.
Return procedure for LF198AH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LF198AH/NOPB Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
