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Texas Instruments LF353D
- Part No.:
- LF353D
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LF353D.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,644
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Product details
Overview
LF353D from Texas Instruments is a JFET-input dual operational amplifier optimized for high-speed, low-input-bias-current applications including oscilloscopes, solar inverters, and pro audio mixers. It delivers 3 MHz gain bandwidth, 13 V/µs slew rate, and 50 pA typical input bias current in an SOIC-8 package rated for 0°C to 70°C operation.
For engineers reviewing the LF353D datasheet, LF353D pinout, LF353D application, or LF353D equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The LF353D integrates two independent JFET-input op-amps on a single monolithic die, each featuring high input impedance (10¹² Ω), internally trimmed offset voltage, and bipolar output stages with 200-Ω short-circuit protection. Its JFET input stage enables stable operation with high-impedance feedback networks and rail-to-rail common-mode input range up to VCC+ − 4 V.
It operates from dual supplies (±3.5 V to ±18 V) or single supply (up to 36 V), supports unity-gain stable configurations, and exhibits 120 dB crosstalk attenuation at 1 kHz - confirming true dual-amplifier isolation without internal coupling paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 3 MHz typical - enables stable closed-loop operation up to ~300 kHz with gain of 10, suitable for active filters and signal conditioning in motor drives. |
| Slew Rate | 13 V/µs typical - supports clean amplification of fast-rising signals (e.g., PWM edges in AC inverters) without distortion. |
| Input Bias Current | 50 pA typical at 25°C - allows use of MΩ-range feedback resistors without significant DC error in precision integrators or sensor interfaces. |
| Input Impedance | 10¹² Ω typical - minimizes loading on high-Z sources like piezoelectric sensors or photodiode transimpedance nodes. |
| Common-Mode Range | VCC− + 4 V to VCC+ − 4 V - supports input signals near positive rail but excludes negative rail, requiring level-shifting in single-supply designs. |
| Supply Current | 3.6 mA typical (per amplifier) - enables dual-channel analog signal processing in power-constrained industrial modules. |
| ESD Rating | ±2000 V HBM - meets standard handling requirements for assembly in non-classified environments without special ESD controls. |
Pinout & Package
LF353D is housed in an SOIC-8 (D) package measuring 4.90 mm × 3.91 mm with 1.27 mm lead pitch and 1.75 mm max height. Pin 1 is located at the top-left corner adjacent to the notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Output of Amplifier 1 | Low-impedance buffered output capable of driving ≥10 kΩ loads; includes 200-Ω series resistance for short-circuit protection. |
| 1IN− | Inverting Input of Amplifier 1 | High-impedance JFET node; requires matched layout to 1IN+ to minimize offset drift from thermal gradients. |
| 1IN+ | Noninverting Input of Amplifier 1 | High-impedance JFET node; common-mode range extends to VCC+ − 4 V, enabling rail-sensing applications. |
| VCC− | Negative Supply Rail | Reference for dual-supply operation; must be decoupled with 0.1 µF ceramic capacitor placed ≤2 mm from pin. |
| 2IN+ | Noninverting Input of Amplifier 2 | Independent high-Z input; no internal connection to Amplifier 1 - verified by 120 dB crosstalk attenuation at 1 kHz. |
| 2IN− | Inverting Input of Amplifier 2 | Independent high-Z input; layout symmetry with 2IN+ recommended to match amplifier pair performance. |
| 2OUT | Output of Amplifier 2 | Functionally identical to 1OUT; supports independent closed-loop configurations without shared output path. |
| VCC+ | Positive Supply Rail | Reference for dual-supply operation; bypassing required per TI layout guidelines to suppress supply-induced noise. |
Key Features
| Feature | Design Value |
|---|---|
| Low Input Bias Current | 50 pA typical enables >10 MΩ feedback resistor use in precision integrators without measurable drift over time. |
| JFET Input Stage | Delivers 10¹² Ω input resistance and 0.01 pA/√Hz input noise current - critical for low-noise photodiode or piezo sensor front-ends. |
| Internally Trimmed Offset | 10 mV typical VIO eliminates need for external nulling circuitry in cost-sensitive industrial instrumentation. |
| Dual Independent Amplifiers | 120 dB crosstalk attenuation ensures channel isolation in dual-path signal chains such as stereo audio preamps or differential ADC drivers. |
| Short-Circuit Protected Output | 200-Ω series resistance limits fault current to <75 mA at ±15 V - prevents latch-up during board-level testing or field faults. |
Applications
| Oscilloscope Vertical Amplifier | Solar Inverter Voltage Sensing |
|---|---|
Use Scenario: Amplifying and conditioning fast-rising probe signals before digitization in benchtop oscilloscopes. IC Role / Device Role / Timing Role: Dual-channel wideband amplifier providing gain, DC offset control, and bandwidth limiting. Use Value: 13 V/µs slew rate preserves edge fidelity of 10–100 ns pulses; 3 MHz GBW supports 20–50 MHz analog front-end bandwidth. |
Use Scenario: Isolating and scaling DC bus voltage feedback in grid-tied solar inverters for MCU-based PWM control. IC Role / Device Role / Timing Role: High-impedance buffer and precision attenuator in isolated voltage sensing path. Use Value: 50 pA input bias current avoids loading across 1 MΩ+ divider networks; 0°C–70°C rating matches inverter ambient range. |
| Pro Audio Mixer Channel Strip | UPS Motor Control Signal Conditioning |
Use Scenario: Implementing active EQ, gain staging, and summing in professional analog audio mixing consoles. IC Role / Device Role / Timing Role: Low-noise, low-distortion dual op-amp for tone-shaping and signal routing. Use Value: 0.01 pA/√Hz input noise current minimizes hiss in high-gain microphone preamp stages; SOIC-8 fits dense PCB layouts. |
Use Scenario: Conditioning speed and current feedback signals in uninterruptible power supply motor drive subsystems. IC Role / Device Role / Timing Role: Dual-channel signal conditioner for rotor position sensing and phase current monitoring. Use Value: Dual independent amplifiers enable simultaneous processing of two motor phases; 3.6 mA supply current supports multi-channel integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual JFET-input operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L2CD | Lower supply current (1.4 mA), lower slew rate (0.065 V/µs), CMOS input (not JFET), 1.8–16 V single-supply only. | Better for ultra-low-power battery-operated sensors; unsuitable for high-speed signal conditioning or dual-supply systems. | Select when power budget <2 mA per amp and bandwidth <10 kHz suffices; avoid for oscilloscope or inverter use. |
| TL072CD | Higher slew rate (13 V/µs same), higher GBW (3 MHz same), lower input bias current (30 pA), same SOIC-8 package and pinout. | Direct drop-in replacement with improved noise performance (18 nV/√Hz vs 25 nV/√Hz) and tighter VIO spec (3 mV max). | Preferred where lower noise or tighter offset is required; validated pin-compatible with identical footprint and thermal profile. |
Compared with LF353D, TL072CD offers lower input noise and tighter offset voltage while maintaining identical speed and package, whereas TLC27L2CD trades bandwidth and supply flexibility for micro-power operation - making TL072CD the optimal upgrade and TLC27L2CD a niche low-power alternative.
Availability
LF353D is available at Aetrix Electronics and suitable for oscilloscope manufacturing, solar inverter production, and pro audio equipment development requiring stable component supply across extended industrial lifecycles.
Supply support for LF353D 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 founded in 1930, specializing in analog ICs, embedded processors, and high-reliability components for industrial, automotive, and communications markets.
The LF353D belongs to TI's legacy JFET-input op-amp product line designed for cost-sensitive, high-speed analog signal conditioning in test equipment, power electronics, and audio systems - emphasizing robustness, wide supply range, and proven field reliability.
FAQ
What is the maximum operating temperature range for the LF353D?
The LF353D is characterized for operation from 0°C to 70°C ambient temperature. This range is specified in the Recommended Operating Conditions table of the official TI datasheet (SLOS012C, March 2016 revision). Operation outside this range may result in degraded electrical performance or reliability risk, and is not guaranteed by TI's specifications for the LF353D.
Does the LF353D support single-supply operation?
Yes, the LF353D supports single-supply operation with a total supply voltage up to 36 V (e.g., VCC+ = 36 V, VCC− = GND). However, its input common-mode range does not include the negative rail - it extends from VCC− + 4 V to VCC+ − 4 V - so input signals must be biased within that window. The LF353D datasheet confirms this behavior in Section 6.3 Recommended Operating Conditions.
What is the purpose of the 200-Ω output resistance in the LF353D?
The 200-Ω series resistance in the LF353D output stage provides inherent short-circuit protection. As stated in TI's Detailed Description (Section 8.1), this resistance limits fault current to safe levels - for example, ~75 mA at ±15 V supply - preventing thermal runaway or permanent damage during accidental output-to-ground shorts. It is not a design limitation but an intentional safety feature.
Is the LF353D pin-compatible with the TL072CD?
Yes, the LF353D and TL072CD share identical SOIC-8 pinout, terminal functions, and mechanical footprint. Both devices follow the standard dual-op-amp configuration: Pin 1 (1OUT), Pin 2 (1IN−), Pin 3 (1IN+), Pin 4 (VCC−), Pin 5 (2IN+), Pin 6 (2IN−), Pin 7 (2OUT), Pin 8 (VCC+). This compatibility is confirmed by TI's package drawings and pin function tables for both parts.
Can the LF353D drive capacitive loads directly?
The LF353D is not explicitly characterized for direct capacitive load driving in its datasheet. While it can tolerate moderate capacitance (<100 pF) with proper layout, larger loads (e.g., >500 pF) risk instability due to phase margin degradation. TI recommends using a series isolation resistor (e.g., 100–500 Ω) between the LF353D output and capacitive loads - a technique validated in Application Note SLOA089 for maintaining stability in such configurations.
LF353D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- J-FET
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 13V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 5 mV
- Current - Supply:
- 3.6mA (x2 Channels)
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LF353D FAQ
1.How can I place an order for LF353D through Aetrix?
Please submit a Request for Quotation (RFQ) for LF353D 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 LF353D reliable?
The price and inventory of LF353D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF353D is usually 5 days.
3.What payment methods are accepted for LF353D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF353D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF353D?
LF353D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF353D 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 LF353D?
For technical support, including LF353D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF353D requirements.
6.How does Aetrix verify that LF353D is sourced from the original manufacturer or authorized distributors?
All LF353D 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 LF353D meets industry standards.
7.What is the process for return or replacement of LF353D?
All LF353D units undergo pre-shipment inspection (PSI). If there is an issue with LF353D, 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 LF353D part is unused and in its original packaging.
Return procedure for LF353D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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