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LM361MX/NOPB
Texas Instruments
IC COMPARATOR 1 DIFF 14SOIC
10112 Pcs New Original In Stock
Comparator Differential Complementary, TTL 14-SOIC
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5.0 / 5.0
- (485 Ratings)
LM361MX/NOPB
Product Overview
1276408
DiGi Electronics Part Number
LM361MX/NOPB-DGManufacturer
Texas Instruments
LM361MX/NOPB
Description
IC COMPARATOR 1 DIFF 14SOICInventory
10112 Pcs New Original In Stock
Comparator Differential Complementary, TTL 14-SOIC
Quantity
Minimum 1
Minimum 1
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LM361MX/NOPB Technical Specifications
Category
Linear, Comparators
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
Product Status
Active
Type
Differential
Number of Elements
1
Output Type
Complementary, TTL
Voltage - Supply, Single/Dual (±)
±5V ~ 15V
Voltage - Input Offset (Max)
5mV @ 5V
Current - Input Bias (Max)
10µA @ 5V
Current - Output (Typ)
-
Current - Quiescent (Max)
5mA, 10mA, 20mA
CMRR, PSRR (Typ)
-
Propagation Delay (Max)
20ns
Hysteresis
-
Operating Temperature
0°C ~ 70°C
Package / Case
14-SOIC (0.154", 3.90mm Width)
Mounting Type
Surface Mount
Supplier Device Package
14-SOIC
Base Product Number
LM361
Datasheet & Documents
HTML Datasheet
LM361MX/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
LM361MX/NOPBCT-DG
*LM361MX/NOPB
LM361MX/NOPBTR
296-47682-6
LM361MX/NOPBDKR
LM361MX-NDR
296-47682-1
LM361MX/NOPBTR-DG
296-47682-2
LM361MX/NOPBCT
LM361MX/NOPBDKR-DG
LM361MX/NOPB-DG
LM361MXNOPB
Standard Package
2,500
Alternative Parts
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
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Dec 02, 2025
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Dec 02, 2025
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Dec 02, 2025
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Frequently Asked Questions (FAQ)
Can the LM361MX/NOPB be safely used as a drop-in replacement for the LM311 in a high-speed TTL-compatible comparator circuit, and what layout or biasing adjustments might be needed?
The LM361MX/NOPB is not a direct drop-in replacement for the LM311 due to differences in pinout, output stage configuration, and internal compensation. While both are high-speed comparators with TTL-compatible outputs, the LM361MX/NOPB features a complementary output stage and requires careful attention to pull-up/pull-down resistor selection and load capacitance. Additionally, its internal frequency compensation may affect transient response in edge-sensitive applications. When substituting, verify pin compatibility (14-SOIC vs. 8-DIP/SOIC for LM311), ensure proper termination of unused inputs, and consider adding a small hysteresis network (e.g., 10–100 mV via feedback resistor) to prevent oscillation near the switching threshold. Always validate timing performance under actual load conditions due to the LM361MX/NOPB’s 20ns propagation delay sensitivity to capacitive loading.
What are the critical reliability risks when operating the LM361MX/NOPB near its ±15V supply limit in an industrial environment with voltage transients, and how can they be mitigated?
Operating the LM361MX/NOPB at ±15V—its absolute maximum supply voltage—in industrial environments exposes it to risks from voltage spikes, ground bounce, and thermal stress, especially since its quiescent current can reach 20mA under full load, increasing power dissipation. Prolonged operation at elevated voltages without transient suppression may lead to premature degradation or latch-up. To mitigate this, use TVS diodes on the supply rails, implement local decoupling with a 100nF ceramic capacitor placed within 5mm of the IC, and consider a series ferrite bead if conducted noise is present. Additionally, ensure the PCB layout minimizes loop areas in high-di/dt paths and avoid operating continuously at maximum voltage unless thermal derating is applied—especially important given the 0°C to 70°C operating range, which limits heat sinking options in sealed enclosures.
How does the input bias current of the LM361MX/NOPB (max 10µA @ 5V) affect accuracy in high-impedance sensor interface circuits, and what design techniques minimize offset errors?
The LM361MX/NOPB’s input bias current of up to 10µA can introduce significant offset voltage when driving high-impedance sources (e.g., photodiodes, piezoelectric sensors, or resistive dividers >10kΩ), potentially causing false triggering or reduced threshold accuracy. For example, a 100kΩ source impedance would generate up to 1V of offset—far exceeding its 5mV max input offset voltage. To minimize this, use a matched impedance path on the inverting input (e.g., a resistor to ground equal to the Thevenin equivalent of the sensing network), select low-leakage PCB materials (e.g., FR4 with proper guard rings), and avoid long traces near noisy digital lines. In precision applications, consider adding a low-input-bias-current buffer stage (e.g., OPA140) ahead of the LM361MX/NOPB or switching to a comparator with pA-level bias current if signal integrity is critical.
Is the LM361MX/NOPB suitable for replacing the MAX9015 in a 3.3V TTL-logic interface application, and what performance trade-offs should be expected?
The LM361MX/NOPB is not ideal for direct replacement of the MAX9015 in 3.3V systems due to its minimum single-supply operating voltage of 5V and lack of guaranteed output levels at lower voltages. While the MAX9015 operates down to 2.7V and ensures clean TTL/CMOS output swings at 3.3V, the LM361MX/NOPB requires at least ±2.5V (or 5V single-supply) to maintain proper output logic levels and propagation delay performance. Attempting to run it at 3.3V may result in undefined output states, increased propagation delay beyond 20ns, and reduced noise margin. If migration is necessary, use a level shifter on the output or redesign the power architecture to support 5V. Alternatively, consider modern low-voltage alternatives like the TLV3501 for better compatibility with 3.3V logic families.
What layout practices are essential to prevent oscillation in the LM361MX/NOPB when used in a high-gain differential sensing application with long input traces?
To prevent oscillation in the LM361MX/NOPB—especially in high-gain or fast-edge applications with long input traces—follow strict high-speed layout practices: keep input traces short and symmetrical to minimize parasitic inductance and capacitance mismatch; place a 10–100pF capacitor directly across the comparator inputs to dampen high-frequency ringing; use a solid ground plane beneath the device to reduce ground impedance; and isolate the analog input section from digital return paths. Additionally, avoid routing high-speed digital signals (e.g., clock lines) parallel to comparator inputs. Even though the LM361MX/NOPB includes internal compensation, external parasitics can destabilize it near the switching threshold. Adding 1–5mV of controlled hysteresis via a feedback resistor (e.g., 1MΩ from output to non-inverting input) further improves noise immunity and prevents chatter in marginal signal conditions.
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LM361MX/NOPB CAD Models
Texas Instruments LM361MX/NOPB PCB symbols & footprints
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