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Texas Instruments LM361MX/NOPB
- Part No.:
- LM361MX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM361MX/NOPB.pdf
- Description:
- IC COMPARATOR 1 DIFF 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,771
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Product details
Overview
LM361MX/NOPB from Texas Instruments (formerly National Semiconductor) is a high-speed differential voltage comparator with complementary TTL outputs, 20 ns max propagation delay, ±15 V dual-supply operation, and 1 mV typical input offset voltage. It serves as a pin-for-pin replacement for SE529/NE529 in zero-crossing detection and flash analog-to-digital converter front-ends.
For engineers reviewing the LM361MX/NOPB datasheet, LM361MX/NOPB pinout, LM361MX/NOPB application, or LM361MX/NOPB equivalent, key selection criteria include guaranteed 20 ns max delay, tight output skew (≤5 ns), low input offset drift over temperature, TTL-compatible strobe control, and operation across 0°C to +70°C industrial range.
Technical Context
The LM361MX/NOPB implements a fully differential input stage optimized for minimal overdrive-dependent delay variation-only 3 ns change across 5 mV to 500 mV overdrive. Its complementary outputs are internally matched to ensure ≤5 ns skew under all operating conditions.
It features independent TTL-level strobe control that disables both outputs when pulled low, drawing −1.6 mA sink current. The device operates from split supplies (±5 V to ±15 V) and a separate +5 V gate supply (VCC), decoupling logic-level output drive from analog supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 14–20 ns max; enables sampling at >25 MHz in flash ADCs |
| Input Offset Voltage | 1–5 mV max; ensures accurate threshold detection down to 10 mV signal swings |
| Output Skew | ≤5 ns max; maintains timing integrity between complementary A/B outputs |
| Supply Range (V+/V−) | ±5 V to ±15 V; supports legacy op-amp supply rails without level-shifting |
| VCC Supply Range | 4.75–5.25 V; guarantees TTL-compatible output swing with 6.4 mA sink capability |
| Operating Temperature | 0°C to +70°C; qualified for commercial-grade industrial control and data acquisition |
| Strobe Input Threshold | 0.8 V (low), 2.0 V (high); compatible with standard 5 V CMOS/TTL logic families |
Pinout & Package
Molded Dual-In-Line Package (DIP), 14-pin, NS Package Number M14A - RoHS-compliant, surface-mountable with gull-wing leads (LM361MX/NOPB variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−) | Differential input node; referenced to common-mode range of ±6 V |
| 2 | Non-Inverting Input (+) | Differential input node; accepts fast-rising/falling analog signals up to 100 MHz |
| 3 | Strobe Input | TTL-compatible enable/disable control; pulls outputs low when <0.8 V |
| 4 | V− | Negative analog supply rail; must be ≥−15 V and ≤−6 V for specified performance |
| 5 | Output B (Complementary) | Active-low TTL output; sinks 6.4 mA at 0.4 V max for driving logic loads |
| 6 | Output A (True) | Active-high TTL output; sources −0.5 mA at 2.4 V min under load |
| 7 | GND | Signal reference for strobe and VCC; separate from analog ground path |
| 8 | VCC | +5 V logic supply; powers output drivers independently of V+/V− |
| 9 | V+ | Positive analog supply rail; must be ≤+15 V and ≥+5 V |
| 10–14 | No Connect / Test Pins | Internally unused; must remain unconnected per datasheet guidance |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed 20 ns max delay | Enables reliable timing in 25+ MSPS flash ADCs without external delay compensation |
| Complementary TTL outputs | Eliminates need for external inverters in differential latch or encoder interfaces |
| Independent strobe control | Allows synchronous blanking of comparator decisions during system calibration or reset cycles |
| Low input offset voltage drift | Maintains sub-5 mV threshold accuracy across full 0°C–70°C operating range |
| Split-supply analog + dedicated VCC | Isolates noise-sensitive analog core from digital output switching transients |
Applications
| Disk Drive Zero-Crossing Detection | Flash ADC Front-End Comparator |
|---|---|
Use Scenario: Detecting magnetic head position transitions in hard disk read channels by identifying analog waveform polarity reversals. IC Role / Device Role / Timing Role: High-speed differential comparator generating synchronized edge-aligned strobes for servo control logic. Use Value: 20 ns delay and ≤5 ns output skew ensure precise timing alignment between read channel and actuator positioning firmware. | Use Scenario: Simultaneous comparison of analog input against multiple reference voltages in parallel ADC architectures. IC Role / Device Role / Timing Role: Core decision element in 8-bit flash ADCs requiring matched propagation paths for all bits. Use Value: Complementary outputs and tight skew allow direct connection to D-latch arrays without skew-induced metastability. |
| High-Speed Pulse Width Modulation Monitor | Industrial Motor Phase Detection |
Use Scenario: Real-time validation of PWM duty cycle fidelity in switched-mode power supplies before feedback loop correction. IC Role / Device Role / Timing Role: Fast comparator capturing rising/falling edges of modulated gate drive signals for jitter analysis. Use Value: 3 ns delay variation over 5–500 mV overdrive enables consistent edge timing regardless of signal amplitude noise. | Use Scenario: Monitoring back-EMF zero crossings in three-phase BLDC motor controllers to commutate windings precisely. IC Role / Device Role / Timing Role: Differential comparator rejecting common-mode noise on motor phase terminals while detecting polarity flips. Use Value: ±6 V input common-mode range accommodates high-voltage motor phase signals without attenuation or bias networks. |
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 |
|---|---|---|---|
| LM360N | Single-output version; no complementary outputs; 25 ns max delay; same package and pinout except missing Output B | Requires external inverter for true/complement logic; less suitable for latch-based ADCs | Select when only one output polarity is needed and board space is constrained |
| TL3016CD | 22 ns max delay; wider VCC range (4.5–16 V); no dedicated strobe input; higher input bias current (50 µA) | Lacks strobe gating; requires external enable logic; better suited for general-purpose high-speed comparison | Choose when strobe control is unnecessary and single-supply operation is preferred |
Compared with LM361MX/NOPB, LM360N sacrifices output complementarity and speed for reduced pin count, while TL3016CD trades strobe functionality and precision input specs for broader supply flexibility and simplified interface.
Availability
LM361MX/NOPB is available at Aetrix Electronics and suitable for disk drive servo systems, flash analog-to-digital converters, PWM monitoring circuits, and BLDC motor phase detection requiring stable component supply and long-term industrial availability.
Supply support for LM361MX/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 acquired National Semiconductor in 2011 and maintains its high-performance analog portfolio, including legacy precision comparators and interface ICs.
The LM361MX/NOPB belongs to the LM161/LM361 family-designed specifically for high-speed, low-skew differential comparison in data acquisition and motion control systems where timing predictability is critical.
FAQ
What is the maximum operating temperature range for LM361MX/NOPB?
The LM361MX/NOPB is rated for 0°C to +70°C operation, meeting commercial-grade industrial requirements. This range is confirmed in the Absolute Maximum Ratings and Operating Conditions tables of the official datasheet (DS005708). Unlike the military-grade LM161 variant, LM361MX/NOPB does not support extended temperature ranges. Thermal derating is not required within this envelope, and all electrical specifications-including 20 ns max propagation delay-are guaranteed across the full 0°C to +70°C span.
Does LM361MX/NOPB require external pull-up resistors on its TTL outputs?
No, LM361MX/NOPB does not require external pull-up resistors. Its complementary TTL outputs are actively driven: Output A sources up to −0.5 mA at ≥2.4 V, and Output B sinks up to 6.4 mA at ≤0.4 V, per the Electrical Characteristics table. These specifications confirm full TTL-compatibility without external components. The internal output stage uses bipolar transistor logic, eliminating reliance on passive pull-ups that would degrade speed and increase power consumption.
Can LM361MX/NOPB operate from a single +5 V supply?
No, LM361MX/NOPB cannot operate from a single +5 V supply. It requires three distinct supply connections: V+ (positive analog rail), V− (negative analog rail), and VCC (positive logic rail). The datasheet specifies minimum analog supply magnitudes of ±5 V and a VCC range of 4.75–5.25 V. Attempting single-supply operation violates absolute maximum ratings and will result in undefined output behavior or device damage. Proper operation mandates split analog supplies and a dedicated 5 V logic rail.
What is the function of the strobe input on LM361MX/NOPB?
The strobe input on LM361MX/NOPB enables synchronous disabling of both complementary outputs. When strobe voltage falls below 0.8 V, outputs are forced low (Output A = low, Output B = low), sinking −1.6 mA. This allows precise timing control-e.g., blanking comparator decisions during ADC conversion windows or system calibration phases. Strobe operation is TTL-compatible and electrically isolated from the analog supply domains, preserving noise immunity while enabling deterministic output gating without external logic.
Is LM361MX/NOPB pin-compatible with SE529/NE529?
Yes, LM361MX/NOPB is explicitly documented as a pin-for-pin replacement for SE529/NE529. The General Description states: "The LM161/LM361 [...] is a pin-for-pin replacement" and confirms improved speed and lower input offset. Pin mapping, supply pin locations (V+, V−, VCC, GND), and functional pin roles-including strobe, inverting/non-inverting inputs, and complementary outputs-are identical. No PCB layout changes are required when upgrading from SE529/NE529 to LM361MX/NOPB, though design verification should confirm timing margins under actual overdrive conditions.
LM361MX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Differential
- Number of Elements:
- 1
- 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:
- Surface Mount
- :
- 14-SOIC
LM361MX/NOPB FAQ
1.How can I place an order for LM361MX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM361MX/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 LM361MX/NOPB reliable?
The price and inventory of LM361MX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM361MX/NOPB is usually 5 days.
3.What payment methods are accepted for LM361MX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM361MX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM361MX/NOPB?
LM361MX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM361MX/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 LM361MX/NOPB?
For technical support, including LM361MX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM361MX/NOPB requirements.
6.How does Aetrix verify that LM361MX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM361MX/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 LM361MX/NOPB meets industry standards.
7.What is the process for return or replacement of LM361MX/NOPB?
All LM361MX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM361MX/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 LM361MX/NOPB part is unused and in its original packaging.
Return procedure for LM361MX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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