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Texas Instruments LM359M
- Part No.:
- LM359M
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM359M.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,072
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Product details
Overview
LM359M from Texas Instruments is a dual, high-speed, programmable current-mode (Norton) amplifier IC designed for wideband video, active filter, and photodiode amplification applications. It delivers 400 MHz gain-bandwidth product at AV = 10–100, 60 V/μs slew rate, and operates from a single 5–22 V supply with inverting output swing from 2 mV to VCC −2 V.
For engineers reviewing the LM359M datasheet, LM359M pinout, LM359M application, or LM359M equivalent, key selection considerations include user-programmable ISET(IN)/ISET(OUT) for gain-bandwidth-slew trade-offs, current-differencing input architecture enabling >VCC common-mode input voltage, and decompensated internal design requiring external compensation below inverting gain of 10.
Technical Context
The LM359M implements two independent cascode-based current differencing amplifiers, not voltage-mode op-amps, with non-inverting input realized via a precision current mirror (mirror gain = 0.9–1.1 μA/μA). Its open-loop dominant pole is set by ISET(IN), enabling programmable bandwidth from 30 MHz (AV = 1) to 400 MHz (AV = 10–100).
Stability relies on external compensation: internally compensated for inverting closed-loop gains ≥10; for lower gains or non-inverting configurations, lead capacitance (1–5 pF) across feedback resistor or COMP-pin-to-ground capacitance (e.g., 20 pF) is required. Output stage uses Darlington emitter follower biased by ISET(OUT), supporting up to ~10×ISET(OUT) sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 400 MHz at AV = 10–100 (ISET = 0.5 mA); sets maximum usable closed-loop bandwidth before phase margin erosion. |
| Slew Rate | 60 V/μs at AV = 10–100 (ISET = 0.5 mA); enables faithful reproduction of fast video edges and pulse waveforms. |
| Input Common-Mode Range | Exceeds VCC (e.g., +25 V with 22 V supply); allows direct DC-coupled input above rail without clamping diodes. |
| Output Voltage Swing | 2 mV to VCC −2 V into 600 Ω; supports rail-to-rail AC-coupled video output with minimal headroom loss. |
| Mirror Gain Accuracy | 0.9–1.1 μA/μA over temperature; ensures precise current replication between non-inverting and inverting inputs for stable biasing. |
| Supply Voltage Range | 5 V to 22 V single supply; eliminates need for dual-rail supplies in video and RF signal chains. |
| Input Bias Current | 8–15 μA (25°C), ≤30 μA (full temp range); low enough for high-Z photodiode and filter node interfaces. |
| Spot Noise | 6 nV/√Hz above 1 kHz; critical for low-noise preamplification of weak optical signals. |
Pinout & Package
LM359M is housed in a 14-pin plastic DIP (Dual In-line Package), package code D0014A per TI documentation. Pin functions are validated per Figure 1 (top view) in SNOSBT4C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ISET(OUT)) | Output stage bias current programming input | Sets Darlington emitter follower quiescent current; determines max output sink capability (~10×ISET(OUT)) and supply current share. |
| 2 (IN1−) | Inverting input of Amplifier 1 | Current-input node; requires external DC bias current (IIN(+)) for single-supply operation and defines closed-loop gain with feedback network. |
| 3 (COMP1) | Compensation terminal for Amplifier 1 | Connects to ground or feedback network for stability tuning; internal capacitor accessible externally for adjustable dominant pole placement. |
| 4 (V−) | Negative supply / ground reference | Ground pin for single-supply operation; all internal bias currents referenced to this node. |
| 5 (NC) | No connect | Internally unconnected pin; must remain floating-no routing or grounding permitted. |
| 6 (OUT1) | Inverting output of Amplifier 1 | Voltage-output node with rail-to-rail swing; drives 600 Ω loads directly; output impedance ≈3.5 Ω at 1 MHz. |
| 7 (IN1+) | Non-inverting input of Amplifier 1 | Current-mirror input; sinks current equal to IN1− current (within mirror gain tolerance); used for DC biasing and common-mode rejection. |
| 8 (ISET(IN)) | Input stage bias current programming input | Sets total input-stage current (~3×ISET(IN)); directly controls slew rate, GBW, input resistance (2.5 kΩ), and input bias current. |
| 9 (IN2+) | Non-inverting input of Amplifier 2 | Current-mirror input for second amplifier; functionally identical to Pin 7 but isolated for dual-channel operation. |
| 10 (OUT2) | Inverting output of Amplifier 2 | Independent voltage output; same electrical specs as Pin 6; enables dual-channel video buffering or biquad filter topologies. |
| 11 (IN2−) | Inverting input of Amplifier 2 | Current-input node for second amplifier; fully independent of Amplifier 1; supports separate gain and compensation networks. |
| 12 (COMP2) | Compensation terminal for Amplifier 2 | Independent compensation node; allows individual frequency response tailoring per channel without crosstalk. |
| 13 (V+) | Positive supply input | Accepts 5–22 V DC; powers both amplifiers; internal regulators derive bias voltages from this rail. |
| 14 (NC) | No connect | Internally unconnected pin; must remain floating-no routing or grounding permitted. |
Key Features
| Feature | Design Value |
|---|---|
| User-programmable operating parameters | ISET(IN) and ISET(OUT) pins allow independent optimization of GBW, slew rate, output drive, and power consumption per application. |
| Current-differencing input architecture | Enables input common-mode voltage >VCC and high common-mode rejection without level-shifting circuitry. |
| High-frequency video performance | Differential phase/gain errors <1°/<0.5% at 3.58 MHz confirm suitability for NTSC/PAL composite video amplification. |
| Single-supply DC-coupled operation | Eliminates input/output coupling capacitors in video line drivers and photodiode transimpedance stages. |
| Low 1/f noise corner | 6 nV/√Hz spot noise above 1 kHz enables clean amplification of low-frequency optical signals without excessive filtering. |
| Decompensated internal design | Maximizes raw speed (400 MHz GBW); external compensation provides design flexibility for stability vs. bandwidth trade-offs. |
Applications
| Video Line Driver | High-Q Active Filter |
|---|---|
Use Scenario: Driving 75 Ω coaxial video lines in broadcast equipment with minimal differential phase/gain distortion. IC Role / Device Role / Timing Role: Dual-channel inverting amplifier providing 20 dB fixed gain, DC-coupled output, and 25 MHz −3 dB bandwidth. Use Value: Maintains <1° differential phase error at 3.58 MHz, preserving color fidelity in analog video systems without external AC coupling. | Use Scenario: Implementing 2-amplifier biquad filters for audio equalization or sensor signal conditioning with Q > 20. IC Role / Device Role / Timing Role: One amplifier acts as non-inverting integrator, the other as inverting summer-reducing component count vs. 3-op-amp topologies. Use Value: Enables fo × Qo ≤5 MHz filter designs with stable high-Q response over temperature, leveraging programmable GBW for precise pole placement. |
| Photodiode Transimpedance Amp | Wideband Waveform Generator |
Use Scenario: Converting fast optical pulses from PIN photodiodes into clean voltage waveforms for time-of-flight or LIDAR receivers. IC Role / Device Role / Timing Role: Single-amplifier transimpedance stage with nVBE biasing, optimized for >10 MHz bandwidth and low input capacitance. Use Value: Achieves <45 ns propagation delay and 6 nV/√Hz input-referred noise, preserving pulse rise time and SNR in low-light detection. | Use Scenario: Generating TTL-compatible square waves, triangle waves, or sine waves up to 10 MHz in test equipment and clock synthesis. IC Role / Device Role / Timing Role: Configured as voltage-controlled oscillator (VCO), pulse generator, or crystal-controlled oscillator using internal high-speed comparators. Use Value: Delivers 9.1 MHz sinewave output with <2.5% THD and TTL-compatible outputs-enabling compact, low-jitter signal sources without external logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-mode amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3900N | Lower GBW (1.5 MHz), no ISET programming, fixed bias; lacks COMP pins and high-speed compensation flexibility. | Only suitable for low-frequency general-purpose AC amplification; cannot replace LM359M in video or >1 MHz filter designs. | Select LM3900N only for cost-sensitive, low-bandwidth (<100 kHz) applications where programmability and speed are unnecessary. |
| LMH6629MA | Voltage-mode architecture; 1.5 GHz GBW, 1000 V/μs slew; requires dual supply; no current-differencing inputs or ISET control. | Better for ultra-high-speed voltage-domain circuits (e.g., ADC drivers), but incompatible with Norton-based photodiode or high-CMVR designs. | Choose LMH6629MA when voltage-mode interface, extreme bandwidth, or dual-supply operation is mandatory-not for LM359M's current-mode use cases. |
Compared with LM359M, LM3900N offers no programmability or video-grade performance, while LMH6629MA provides superior speed but abandons the current-differencing architecture essential for >VCC input handling and photodiode biasing-making LM359M uniquely suited for programmable, single-supply, high-CMVR broadband amplification.
Availability
LM359M is available at Aetrix Electronics and suitable for video line driving, high-frequency active filtering, and photodiode signal conditioning requiring stable component supply across industrial and broadcast equipment lifecycles.
Supply support for LM359M 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-performance analog ICs for industrial, automotive, and communications markets.
The LM359M belongs to TI's legacy high-speed amplifier family, engineered specifically for programmable current-mode signal processing in video, instrumentation, and optical sensing applications where rail-exceeding inputs and wide dynamic range are critical.
FAQ
What is the maximum supply voltage for the LM359M?
The LM359M supports a maximum supply voltage of 22 VDC (or ±11 VDC in split-supply configurations), as specified in the Absolute Maximum Ratings table of the SNOSBT4C datasheet. Exceeding this voltage risks permanent device damage. Operation at 12 V is typical for video applications, balancing headroom, power dissipation, and output swing.
How do I configure the LM359M for stable unity-gain inverting operation?
The LM359M is not internally compensated for unity-gain inverting operation. To achieve stability, add a 1–5 pF lead capacitor in parallel with the feedback resistor (e.g., 30 kΩ or less), as shown in Figure 32 of SNOSBT4C. This preserves slew rate while adding phase lead; omitting it causes oscillation due to stray capacitance at the inverting input.
Can the LM359M drive a 75 Ω video load directly?
Yes-the LM359M delivers full 20 dB gain into 75 Ω with <1° differential phase error at 3.58 MHz (Figure 35), confirming direct 75 Ω driving capability. Its output stage sinks up to ~10×ISET(OUT) current; with ISET(OUT) = 0.5 mA, it safely drives 75 Ω loads at 12 V supply without external buffers.
What is the purpose of the NC pins (5 and 14) on the LM359M?
Pins 5 and 14 on the LM359M are no-connect (NC) terminals with no internal connection. They must remain unconnected-neither grounded nor routed-to prevent unpredictable behavior or latch-up. TI's package drawing D0014A explicitly confirms these pins are unused and electrically isolated.
How does ISET(IN) affect the LM359M's noise performance?
ISET(IN) directly sets the input-stage current, which governs thermal noise in the LM359M's front-end. At ISET(IN) = 0.5 mA, the device achieves 6 nV/√Hz spot noise above 1 kHz (per Electrical Characteristics table). Reducing ISET(IN) lowers noise current but also reduces slew rate and GBW-requiring careful trade-off in low-noise photodiode applications.
LM359M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 60V/µs
- Gain Bandwidth Product:
- 400 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 8 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 18.5mA (x2 Channels)
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 22 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LM359M FAQ
1.How can I place an order for LM359M through Aetrix?
Please submit a Request for Quotation (RFQ) for LM359M 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 LM359M reliable?
The price and inventory of LM359M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM359M is usually 5 days.
3.What payment methods are accepted for LM359M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM359M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM359M?
LM359M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM359M 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 LM359M?
For technical support, including LM359M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM359M requirements.
6.How does Aetrix verify that LM359M is sourced from the original manufacturer or authorized distributors?
All LM359M 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 LM359M meets industry standards.
7.What is the process for return or replacement of LM359M?
All LM359M units undergo pre-shipment inspection (PSI). If there is an issue with LM359M, 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 LM359M part is unused and in its original packaging.
Return procedure for LM359M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM359M Tags
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LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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