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Texas Instruments LM361H/NOPB
- Part No.:
- LM361H/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- TO-100-10 Metal Can
- Datasheet:
-
LM361H/NOPB.pdf
- Description:
- IC COMPARATOR 2 DIFF TO100-10
- Quantity:
- Payment:
- Shipping:
Inventory:1,732
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Product details
Overview
LM361H/NOPB from Texas Instruments is a high-speed differential comparator with complementary TTL outputs, ±15V dual-supply operation, 20 ns max propagation delay, and tight 5 ns max output skew-designed for zero-crossing detection in disk file systems and high-speed analog-to-digital converter front-ends.
For engineers reviewing the LM361H/NOPB datasheet, LM361H/NOPB pinout, LM361H/NOPB application, or LM361H/NOPB equivalent, this device delivers verified timing-critical performance in industrial motion control feedback loops, precision threshold sensing, and legacy instrumentation requiring strobe-controlled output gating.
Technical Context
The LM361H/NOPB implements a fully differential input stage with independent strobe control enabling synchronous output enable/disable, supporting precise timing alignment in sampled-data systems. Its internal architecture ensures matched propagation paths between complementary outputs (A and B), minimizing jitter-sensitive skew.
It operates across ±6V to ±15V supply rails with dedicated VCC for TTL-level output logic, allowing independent logic-level compatibility while maintaining analog input integrity. Input common-mode range extends to ±6V, supporting direct connection to op-amp outputs without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 20 ns max at 25°C - enables sampling rates up to 50 MHz in comparator-based ADCs |
| Output Skew | 5 ns max - ensures sub-1 LSB timing error in dual-edge triggered conversion schemes |
| Input Offset Voltage | 5 mV max - supports accurate threshold detection down to ~10 mV overdrive |
| Supply Range (V+/V−) | ±6V to ±15V - compatible with standard op-amp rails and legacy industrial power supplies |
| VCC Supply Range | 4.75V to 5.25V - guarantees TTL-compatible output swing under regulated logic supply |
| Strobe Enable Current | 200 μA max at 2.4V - allows direct drive from CMOS logic without buffering |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded systems and test equipment |
Pinout & Package
LM361H/NOPB uses the TO-100 metal-can package (LME0010C), 10-pin, hermetically sealed, with leads arranged in a circular layout optimized for high-frequency signal integrity and thermal stability in analog-intensive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Strobe) | Output enable control input | Active-high TTL-compatible gate: pulls outputs low when disabled; enables complementary A/B outputs when high |
| 2 (V−) | Negative supply rail | Connects to −6V to −15V analog supply; referenced to all internal bias and input stages |
| 3 (In−) | Inverting differential input | Accepts analog signals up to ±6V common-mode; paired with Pin 4 for differential comparison |
| 4 (In+) | Non-inverting differential input | Accepts analog signals up to ±6V common-mode; differential pair with Pin 3 defines switching threshold |
| 5 (VCC) | TTL output logic supply | Provides 5V rail specifically for output driver stage; decoupling required for noise immunity |
| 6 (Out B) | Complementary TTL output | Logic-low when In+ > In−; inverted relative to Out A; matched delay path per datasheet Figure 1 |
| 7 (Out A) | Primary TTL output | Logic-high when In+ > In−; used as main decision output; tightly skewed to Out B (≤5 ns) |
| 8 (V+) | Positive supply rail | Connects to +6V to +15V analog supply; powers input stage and internal reference circuitry |
| 9 (Case) | Hermetic metal-can ground | Must be connected to system analog ground for EMI shielding and thermal dissipation |
| 10 (NC) | No connect | Internally unused; left unconnected per TI package specification LME0010C |
Key Features
| Feature | Design Value |
|---|---|
| Independent strobe control | Enables synchronized output gating in multi-channel acquisition systems without external logic |
| Tight output skew (≤5 ns) | Supports dual-edge sampling architectures where A/B edge alignment is critical to timing accuracy |
| Complementary TTL outputs | Eliminates need for external inverters in latch or flip-flop clocking applications |
| Low input offset voltage (5 mV max) | Reduces false triggering in low-amplitude signal detection, e.g., magnetic head readback |
| Operates from op-amp supplies | Direct interface with ±12V/±15V op-amp stages without level translation or supply splitting |
Applications
| Disk Drive Zero-Crossing Detection | High-Speed ADC Front-End |
|---|---|
|
Use Scenario: Detecting polarity reversal of voice coil motor back-EMF in hard disk drive servo positioning. IC Role / Device Role / Timing Role: Differential comparator generating clean, low-jitter edge transitions synchronized to mechanical rotor position. Use Value: Enables sub-micron head positioning via precise timing of zero-cross events with ≤5 ns A/B skew. |
Use Scenario: Flash or pipeline ADC sampling clock generation using analog input threshold crossing. IC Role / Device Role / Timing Role: High-speed decision element converting analog input into latched digital state with minimal aperture uncertainty. Use Value: 20 ns propagation delay supports ≥40 MSPS conversion rates in 8-bit systems. |
| Industrial Motion Control Feedback | Legacy Test Equipment Threshold Triggering |
|
Use Scenario: Monitoring motor phase current zero crossings to commutate brushless DC drives. IC Role / Device Role / Timing Role: Strobe-gated comparator isolating valid zero-cross windows during PWM dead-time intervals. Use Value: Independent strobe pin prevents false triggers from switching noise, improving torque ripple <5%. |
Use Scenario: Precision trigger in oscilloscopes and logic analyzers detecting user-defined voltage thresholds. IC Role / Device Role / Timing Role: Stable, temperature-compensated comparator with TTL-compatible outputs driving downstream latch circuits. Use Value: 5 mV input offset and ±6V common-mode range support accurate 100 mV–5 V trigger levels across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed differential comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM361M/NOPB | SOIC-14 package, same electrical specs, no metal-can EMI shielding | Better suited for surface-mount PCBs with space constraints; lower thermal mass than TO-100 | Select when board-level EMI is controlled and reflow assembly is preferred over through-hole mounting |
| MAX961ESA+ | Single-supply (2.7V–5.5V), 4.5 ns propagation delay, rail-to-rail inputs | Designed for portable/battery-powered systems; lacks strobe control and ±15V capability | Select only for low-voltage, low-power applications where dual-supply operation is not required |
Compared with LM361M/NOPB and MAX961ESA+, the LM361H/NOPB uniquely combines hermetic TO-100 shielding, strobe gating, and ±15V operation-making it irreplaceable in legacy industrial and storage systems demanding robustness and precise timing alignment under noisy analog conditions.
Availability
LM361H/NOPB is available at Aetrix Electronics and suitable for disk drive servo control, high-speed data acquisition, and industrial motion feedback systems requiring stable component supply and long-term obsolescence management.
Supply support for LM361H/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, embedded processing, and connectivity technologies, with over 90 years of innovation in precision analog components.
The LM361H/NOPB belongs to TI's legacy high-speed comparator product line, engineered specifically for timing-critical analog-to-digital interfaces in storage, instrumentation, and industrial automation where reliability across temperature and supply variation is non-negotiable.
FAQ
What is the maximum operating supply voltage for LM361H/NOPB?
The LM361H/NOPB supports a maximum positive supply voltage (V+) of +16V and a maximum negative supply voltage (V−) of −16V per absolute maximum ratings. For reliable operation, TI specifies recommended operating ranges of ±6V to ±15V. Exceeding ±16V risks permanent damage to the internal differential input stage and output drivers. The LM361H/NOPB must never be operated outside these limits, even transiently.
Does LM361H/NOPB require external pull-up resistors on its TTL outputs?
No, the LM361H/NOPB integrates active TTL output drivers capable of sourcing 0.5 mA and sinking 6.4 mA, eliminating the need for external pull-ups. Its complementary outputs (Out A and Out B) deliver full 0.4V low and 2.4V high logic levels directly into standard TTL loads. Adding pull-up resistors would degrade rise/fall times and increase power consumption unnecessarily. The LM361H/NOPB is designed for direct interface with 74LS or 74F logic families.
Can LM361H/NOPB operate with a single 5V supply?
No, the LM361H/NOPB requires dual-polarity analog supplies (V+ and V−) to bias its differential input stage and cannot function on a single 5V rail. It needs both a positive and negative supply-for example, +12V and −12V-to establish proper common-mode input range and internal node biasing. While VCC is a separate 5V logic supply, the analog core remains strictly dual-supply. Attempting single-supply operation will result in undefined output behavior and potential latch-up.
What is the purpose of the strobe pin on LM361H/NOPB?
The strobe pin (Pin 1) on LM361H/NOPB enables synchronous output gating: when high (≥2.0V), it activates both complementary TTL outputs; when low (≤0.8V), it forces both outputs low regardless of input differential. This allows precise timing control-e.g., enabling comparisons only during valid sampling windows in disk drive servo loops. The LM361H/NOPB strobe consumes only 200 μA at 2.4V, making it compatible with CMOS logic without buffering.
Is LM361H/NOPB RoHS compliant?
Yes, LM361H/NOPB is RoHS compliant, as confirmed in TI's official packaging addendum: "RoHS: Yes" for orderable part number LM361H/NOPB in TO-100 (LME) package. It contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE) above EU Directive 2011/65/EU thresholds. The "NOPB" suffix explicitly denotes lead-free finish, and TI certifies full compliance for this variant.
LM361H/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-100-10 Metal Can
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- Differential
- Number of Elements:
- 2
- Output Type:
- Complementary, TTL
- Voltage - Supply, Single/Dual (±):
- ±5V ~ 15V
- :
- 5mV @ 5V
- Voltage - Input Offset (Max):
- 10µA @ 5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 5mA, 10mA, 20mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 20ns
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Through Hole
- :
- TO-100-10
LM361H/NOPB FAQ
1.How can I place an order for LM361H/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM361H/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 LM361H/NOPB reliable?
The price and inventory of LM361H/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM361H/NOPB is usually 5 days.
3.What payment methods are accepted for LM361H/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM361H/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM361H/NOPB?
LM361H/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM361H/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 LM361H/NOPB?
For technical support, including LM361H/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM361H/NOPB requirements.
6.How does Aetrix verify that LM361H/NOPB is sourced from the original manufacturer or authorized distributors?
All LM361H/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 LM361H/NOPB meets industry standards.
7.What is the process for return or replacement of LM361H/NOPB?
All LM361H/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM361H/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 LM361H/NOPB part is unused and in its original packaging.
Return procedure for LM361H/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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