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Texas Instruments TLC374MD
- Part No.:
- TLC374MD
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLC374MD.pdf
- Description:
- IC COMPARATOR 4 DIFF 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,372
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Product details
Overview
TLC374MD from Texas Instruments is a military-grade LinCMOS™ quadruple differential comparator IC operating from single or dual supplies (4 V to 16 V), featuring 5 mV max input offset voltage, 0.3 mA typical supply current at 5 V, 200 ns typical response time for TTL-level inputs, and n-channel open-drain outputs compatible with TTL/MOS/CMOS logic-used in precision threshold detection within avionics power monitoring systems.
For engineers reviewing the TLC374MD datasheet, TLC374MD pinout, TLC374MD application, or TLC374MD equivalent, key selection considerations include its –55°C to 125°C operating range, 10¹² Ω typical input impedance, 5 pA typical input bias current, ultrastable offset drift (0.23 µV/month), and compatibility with LM339-based layouts requiring extended temperature support.
Technical Context
The TLC374MD implements four independent high-impedance comparators using LinCMOS™ technology, enabling direct interfacing with high-Z sensors and reference sources. Each channel features rail-to-rail common-mode input range down to ground and supports single-supply operation with VDD as high as 16 V.
Its n-channel open-drain output stage allows wired-AND logic configuration across channels and requires external pull-up resistors. Internal ESD protection meets 1000-V HBM rating, and input overvoltage tolerance up to ±18 V (with current limiting) supports robust operation during power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4 V to 16 V - Enables use in 5 V, 12 V, and 15 V industrial/military rails without level-shifting. |
| Input Offset Voltage (max) | 5 mV at 25°C - Ensures reliable detection of small analog thresholds (e.g., ±2.5 mV window) without calibration. |
| Supply Current (typ) | 300 µA per device (4 comparators) at 5 V - Supports low-power battery-backed monitoring circuits. |
| Response Time (typ) | 200 ns for TTL-level input step - Suitable for fast edge detection in pulse-width modulation feedback loops. |
| Input Bias Current (typ) | 5 pA - Minimizes loading error on high-impedance voltage dividers or piezoelectric sensor interfaces. |
| Common-Mode Input Range | 0 V to VDD–1.5 V - Allows direct sensing of signals referenced to ground in single-supply systems. |
| Output Configuration | N-channel open-drain - Permits flexible logic-level translation and multi-comparator wired-AND decision outputs. |
Pinout & Package
TL374MD is supplied in a 14-pin plastic DIP (N package), with pin 1 designated as 1OUT and pin 14 as GND. The device shares the same pinout as LM339 but adds full military temperature qualification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT (Pin 1) | Comparator 1 output | Open-drain NMOS output requiring external pull-up; sinks up to 6 mA at 1.5 V saturation. |
| 2OUT (Pin 2) | Comparator 2 output | Independent open-drain output; electrically isolated from other channels. |
| VDD (Pin 3) | Positive supply | Accepts 4–16 V; powers all four comparators and internal ESD protection circuitry. |
| 2IN– (Pin 4) | Comparator 2 inverting input | High-impedance node (10¹² Ω); accepts DC-coupled signals down to ground. |
| 2IN+ (Pin 5) | Comparator 2 noninverting input | Matches 2IN– in bias current and offset; used for differential or single-ended sensing. |
| 1IN– (Pin 6) | Comparator 1 inverting input | Identical electrical characteristics to 2IN–; supports precision zero-crossing detection. |
| 1IN+ (Pin 7) | Comparator 1 noninverting input | Paired with 1IN–; enables configurable hysteresis via feedback resistor networks. |
| GND (Pin 8) | Ground reference | Return path for supply and all comparator inputs/outputs; must be low-impedance for noise immunity. |
| 3OUT (Pin 9) | Comparator 3 output | Third independent open-drain output; usable for redundant fault signaling or voting logic. |
| 4OUT (Pin 10) | Comparator 4 output | Fourth output; supports multi-threshold monitoring (e.g., under/over-voltage + margin alarms). |
| 4IN+ (Pin 11) | Comparator 4 noninverting input | Final input pair; enables simultaneous evaluation of four independent analog conditions. |
| 4IN– (Pin 12) | Comparator 4 inverting input | Matches 4IN+ in performance; supports matched-pair configurations with external resistors. |
| 3IN+ (Pin 13) | Comparator 3 noninverting input | Third input pair; suitable for reference voltage comparison in triple-redundant systems. |
| 3IN– (Pin 14) | Comparator 3 inverting input | Completes fourth comparator input set; maintains same offset and bias specs as others. |
Key Features
| Feature | Design Value |
|---|---|
| LinCMOS™ process technology | Enables ultra-low input bias current (5 pA typ) and high input impedance (>10¹² Ω), critical for photodiode or strain gauge interfaces. |
| Military temperature range | Specified from –55°C to +125°C, qualifying TLC374MD for deployment in aerospace power control units and engine bay electronics. |
| Pin-compatible with LM339 | Direct drop-in replacement in existing LM339 layouts, preserving PCB design while upgrading to wider temp range and lower IIB. |
| ESD protection (1000 V HBM) | Integrated patented shunt circuit prevents gate oxide damage during handling and board assembly without degrading input leakage. |
| Ultrastable offset drift | 0.23 µV/month typical long-term drift including first 30 days - reduces need for periodic recalibration in sealed systems. |
Applications
| Avionics Power Sequencing Monitor | Industrial Motor Overtemperature Cut-off |
|---|---|
Use Scenario: Detecting precise voltage thresholds during aircraft subsystem power-up to enforce strict sequencing order before enabling downstream loads. IC Role / Device Role / Timing Role: Four independent comparators monitor VBAT, 5V_REG, 12V_AUX, and RESET signals simultaneously, generating discrete enable flags. Use Value: Eliminates need for microcontroller polling; provides deterministic, sub-microsecond response to out-of-spec conditions during cold start. |
Use Scenario: Monitoring thermistor voltage divider outputs across three-phase motor windings to trigger immediate shutdown if any phase exceeds 130°C. IC Role / Device Role / Timing Role: TLC374MD compares each thermistor signal against a stable reference; outputs wired-AND to drive a single fault latch. Use Value: Achieves fail-safe thermal protection with no software latency and guaranteed operation across full military temperature range. |
| Railway Signaling Threshold Detector | Secure Data Acquisition Reference Comparator |
Use Scenario: Validating track circuit voltages in legacy 24 V DC signaling systems where noise immunity and long-term stability are mission-critical. IC Role / Device Role / Timing Role: Compares sensed rail voltage against programmable hysteresis thresholds to distinguish occupied vs. clear track sections. Use Value: Delivers >10-year operational reliability without recalibration due to <0.23 µV/month offset drift and 5 pA input bias. |
Use Scenario: Verifying integrity of precision voltage references (e.g., LTZ1000) in metrology-grade data loggers before initiating ADC conversions. IC Role / Device Role / Timing Role: TLC374MD acts as a guard-band comparator, asserting "reference OK" only when reference stays within ±10 ppm of nominal. Use Value: Prevents corrupted measurements by rejecting ADC cycles when reference drift exceeds specification limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quadruple comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339J | Commercial temp range (0°C to 70°C); higher input offset (7 mV max); 250 µA supply current. | Lacks military qualification; unsuitable for environments exceeding 70°C or requiring long-term drift stability. | Select LM339J only for cost-sensitive, non-mission-critical commercial designs with ambient temperature control. |
| TLC374MFK | Same specs and temp range, but in 20-pin LCCC ceramic package; higher reliability, hermetic seal, MIL-PRF-38535 compliant. | Used in space-grade or high-reliability defense systems where moisture resistance and radiation tolerance are required. | Choose TLC374MFK when board-level hermeticity, extended burn-in, or MIL-STD-883 testing is mandated. |
Compared with LM339J and TLC374MFK, the TLC374MD delivers military-grade performance in a standard PDIP package-offering optimal balance of ruggedness, legacy footprint compatibility, and cost for avionics and industrial control applications where hermetic sealing is unnecessary but extended temperature operation is essential.
Availability
TLC374MD is available at Aetrix Electronics and suitable for avionics power sequencing monitors, industrial motor overtemperature cut-off systems, railway signaling threshold detectors, and secure data acquisition reference comparators requiring stable component supply across extended temperature ranges.
Supply support for TLC374MD 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 and embedded processing technologies, with decades of heritage in high-reliability linear ICs and military-grade components.
The TLC374MD belongs to TI's LinCMOS™ comparator family, engineered specifically for precision, low-power, wide-temperature analog threshold detection in safety-critical and harsh-environment systems.
FAQ
What is the operating temperature range of the TLC374MD?
The TLC374MD is characterized for continuous operation from –55°C to +125°C, meeting military specification requirements for deployment in extreme environmental conditions such as aircraft engine bays, satellite power systems, and armored vehicle electronics. This range is explicitly defined in the datasheet's recommended operating conditions table and verified across all electrical parameters.
Does the TLC374MD require external pull-up resistors on its outputs?
Yes, the TLC374MD features n-channel open-drain outputs that require external pull-up resistors to VDD or another logic rail. Without pull-ups, outputs remain floating in the high state. Typical values range from 1 kΩ to 10 kΩ depending on speed and load requirements; the datasheet specifies 5.1 kΩ in timing test circuits.
Is the TLC374MD pin-compatible with the LM339?
Yes, the TLC374MD uses the identical 14-pin DIP pinout as the LM339, making it a direct hardware replacement in existing designs. All input, output, and supply terminals align exactly-enabling seamless upgrade to improved input bias current (5 pA vs. 25 nA), lower offset drift, and extended temperature capability without PCB changes.
What is the maximum supply voltage the TLC374MD can tolerate?
The absolute maximum supply voltage for the TLC374MD is 18 V, but the recommended operating range is 4 V to 16 V per the datasheet's "Recommended Operating Conditions" table. Operation above 16 V risks parametric degradation and is not guaranteed across temperature or lifetime.
How does the TLC374MD handle input voltages beyond the supply rails?
The TLC374MD tolerates input voltages up to ±18 V differential and –0.3 V to 18 V common-mode, provided input current is externally limited to ±5 mA. Internal ESD protection diodes conduct outside the common-mode range, but sustained overvoltage without current limiting may degrade performance or cause failure.
TLC374MD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- LinCMOS™
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Differential
- Number of Elements:
- 4
- Output Type:
- CMOS, MOS, Open-Drain, TTL
- Voltage - Supply, Single/Dual (±):
- 4V ~ 16V, ±2V ~ 8V
- :
- 5mV @ 5V
- Voltage - Input Offset (Max):
- 5pA @ 5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 800µA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -55°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-SOIC
TLC374MD FAQ
1.How can I place an order for TLC374MD through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC374MD 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 TLC374MD reliable?
The price and inventory of TLC374MD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC374MD is usually 5 days.
3.What payment methods are accepted for TLC374MD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC374MD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC374MD?
TLC374MD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC374MD 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 TLC374MD?
For technical support, including TLC374MD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC374MD requirements.
6.How does Aetrix verify that TLC374MD is sourced from the original manufacturer or authorized distributors?
All TLC374MD 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 TLC374MD meets industry standards.
7.What is the process for return or replacement of TLC374MD?
All TLC374MD units undergo pre-shipment inspection (PSI). If there is an issue with TLC374MD, 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 TLC374MD part is unused and in its original packaging.
Return procedure for TLC374MD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC374MD Tags
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