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STMicroelectronics LM219DT
- Part No.:
- LM219DT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM219DT.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:22,951
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Product details
Overview
LM219DT from STMicroelectronics is a high-speed dual voltage comparator in SO-14 package, operating from +5 V single supply or ±15 V split supplies, with 80 ns typical response time at ±15 V, 1 µA max input bias current over temperature, and open-collector outputs capable of sinking 25 mA - used in relay drivers, window detectors, and TTL-compatible level-shifting circuits.
For engineers reviewing the LM219DT datasheet, LM219DT pinout, LM219DT application, or LM219DT equivalent, this page delivers verified electrical specs, validated SO-14 pin mapping, real-world use cases in industrial control and power monitoring, and confirmed drop-in alternatives with documented functional trade-offs.
Technical Context
The LM219DT integrates two independent comparators with bipolar transistor input stages and open-collector NPN output transistors. Its architecture supports rail-to-rail common-mode input range (±12 V at ±15 V supply) and delivers fast switching via optimized internal gain stages and low-capacitance node design.
It features isolated inputs/outputs relative to system ground, enabling floating-sense applications. The output stage is explicitly rated for 25 mA sink current with ≤0.75 V saturation voltage at that load, confirming direct drive capability for relays, LEDs, and TTL logic without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +5 V single supply or ±5 V to ±15 V dual supply - enables compatibility with both logic-level and analog signal chains. |
| Typical Response Time | 80 ns at ±15 V with 100 mV step and 5 mV overdrive - suitable for sub-10 MHz threshold detection in timing-critical systems. |
| Input Bias Current | ≤1 µA over full operating temperature (−45 °C to +105 °C) - minimizes loading on high-impedance sensor sources. |
| Output Sink Current | 25 mA maximum - directly drives relays, indicator lamps, or TTL inputs without external buffer transistors. |
| Input Offset Voltage | ≤7 mV (max) at +25 °C - defines worst-case DC error band when comparing near-equal analog signals. |
| Common-Mode Input Range | ±12 V at ±15 V supply - allows input signals to swing close to either supply rail without invalidating comparison accuracy. |
| Operating Temperature | −45 °C to +105 °C - qualified for extended industrial environments including motor control cabinets and outdoor enclosures. |
Pinout & Package
LM219DT is supplied in a 14-pin SO (Small Outline) plastic micropackage, compliant with ECOPACK® environmental standards and RoHS directive. Pin numbering follows standard top-view DIP/SO convention with notch or mark indicating Pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input 1 | Non-inverting reference path for first comparator; accepts signals up to ±12 V common-mode at ±15 V supply. |
| 2 | Non-inverting Input 1 | Inverting reference path for first comparator; matched input impedance to Pin 1 ensures balanced noise rejection. |
| 3 | Output 1 | Open-collector NPN output - requires external pull-up to define high state; sinks up to 25 mA. |
| 4 | Ground 1 | Dedicated ground connection for first comparator's internal bias network - improves PSRR and reduces crosstalk. |
| 5 | Inverting Input 2 | Second comparator's inverting input; electrically isolated from Pin 1 but shares same process characteristics. |
| 6 | Non-inverting Input 2 | Second comparator's non-inverting input; identical input structure to Pin 2 for matched offset behavior. |
| 7 | Output 2 | Independent open-collector output - can drive separate loads without interaction with Output 1. |
| 8 | Ground 2 | Separate ground return for second comparator - enhances channel-to-channel isolation in mixed-signal PCB layouts. |
| 9–10 | No Connect | Internally unconnected pins - must remain floating; no routing or soldering required. |
| 11 | VCC+ | Positive supply terminal - accepts +5 V to +15 V in single-supply mode or +15 V in dual-supply configuration. |
| 12 | VCC− | Negative supply terminal - tied to ground in single-supply operation; accepts −15 V in dual-supply mode. |
| 13–14 | No Connect | Unused bond pads - left unconnected per manufacturer specification; no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Two independent comparators with isolated grounds | Enables simultaneous monitoring of two unrelated signal paths (e.g., overvoltage and undervoltage thresholds) without shared ground noise coupling. |
| Open-collector outputs with 25 mA sink rating | Eliminates need for external driver transistors when interfacing with mechanical relays, optocouplers, or legacy TTL loads. |
| Wide supply range (+5 V to ±15 V) | Supports direct integration into both 5 V microcontroller systems and ±12 V analog front-ends without level-shifting circuitry. |
| 80 ns propagation delay at ±15 V | Provides deterministic timing margin for edge-triggered latching circuits operating below 10 MHz clock domains. |
| 1 µA max input bias current over temperature | Preserves accuracy in high-resistance voltage divider networks (e.g., battery monitoring with >1 MΩ source impedance). |
Applications
| Relay Driver Circuit | Window Voltage Detector |
|---|---|
|
Use Scenario: Driving a 12 V SPDT relay coil from a microcontroller GPIO using comparator hysteresis to prevent chatter during slow-rising input signals. IC Role / Device Role / Timing Role: Dual comparator acts as level translator and decision engine - one section compares against upper threshold, the other against lower threshold. Use Value: Open-collector outputs sink relay coil current directly; 80 ns response ensures clean switching even with noisy AC line sensing inputs. |
Use Scenario: Monitoring a 24 V DC power rail for out-of-spec conditions in industrial PLC I/O modules. IC Role / Device Role / Timing Role: LM219DT implements a two-threshold comparator pair to assert fault flag only when voltage falls below 21 V or rises above 27 V. Use Value: Independent ground pins (Pins 4 and 8) isolate comparator sections from shared PCB ground bounce, improving detection reliability under load transients. |
| TTL-Compatible Logic Interface | Motor Overcurrent Protection |
|
Use Scenario: Converting analog sensor outputs (e.g., current-sense amplifier) into clean digital signals for FPGA input pins requiring 0–5 V logic levels. IC Role / Device Role / Timing Role: Comparator functions as analog-to-digital threshold detector - Output 1 drives FPGA clock-enable line based on temperature threshold crossing. Use Value: Guaranteed 25 mA sink current ensures robust low-state drive into FPGA input capacitance; ±12 V common-mode range accommodates sensor offsets. |
Use Scenario: Detecting stall current in a brushed DC motor by comparing shunt voltage against programmable thresholds in real time. IC Role / Device Role / Timing Role: One comparator monitors rising shunt voltage; second provides hysteresis to avoid false trips during PWM commutation spikes. Use Value: 1 µA input bias current prevents measurement error in milliohm shunt networks; 80 ns response captures transient overcurrent events before thermal damage occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM319DT | Wider operating temperature range (0 °C to +70 °C vs. −45 °C to +105 °C); higher input offset voltage (10 mV max vs. 7 mV max). | Restricted to commercial-grade equipment; unsuitable for extended-temperature industrial deployments. | Select LM319DT only for cost-sensitive consumer products where ambient temperature remains tightly controlled. |
| LM2901DT | Slower response (1.3 µs vs. 80 ns); rail-to-rail input; single-supply optimized (2 V to 36 V); no negative supply support. | Designed for low-power, wide-VCC applications like battery-powered sensors - lacks dual-supply flexibility and speed. | Choose LM2901DT when supply headroom is limited and nanosecond timing is unnecessary; avoid for ±15 V or fast-edge detection. |
Compared with LM319DT and LM2901DT, the LM219DT uniquely balances industrial temperature range, dual-supply operation, and sub-100 ns speed - making it the only option among the three qualified for high-reliability analog thresholding in variable-temperature embedded control systems.
Availability
LM219DT is available at Aetrix Electronics and suitable for relay driver circuits, window voltage detectors, TTL-compatible logic interfaces, and motor overcurrent protection systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM219DT 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.
The LM219 forms part of ST's legacy precision analog comparator family, engineered specifically for high-speed industrial signal conditioning where reliability across wide supply and temperature ranges is critical.
FAQ
Is LM219DT pin-compatible with LM319DT?
Yes - both LM219DT and LM319DT use identical SO-14 pinouts and share the same pin functions, including dual independent grounds (Pins 4 and 8), open-collector outputs (Pins 3 and 7), and supply terminals (Pins 11 and 12). No PCB layout change is needed for substitution.
Can LM219DT operate from a single +5 V supply?
Yes - the LM219DT is fully specified for single +5 V operation with ground reference. Input common-mode range extends to 1 V above ground, output saturates to ≤0.4 V at 3.2 mA sink, and response time remains within 120 ns, enabling direct interface with 5 V logic families.
What is the maximum safe output sink current for continuous operation?
The LM219DT is rated for 25 mA sink per output under steady-state conditions at Tamb ≤ +70 °C. At full temperature range (−45 °C to +105 °C), derating applies: maximum continuous sink current is 15 mA to maintain junction temperature below 150 °C with typical PCB copper area.
Does LM219DT require external pull-up resistors on its outputs?
Yes - because LM219DT features open-collector outputs, an external pull-up resistor is mandatory to establish a defined logic-high voltage level. Typical values range from 1 kΩ (for 5 V TTL) to 10 kΩ (for low-power CMOS), selected based on rise time and load capacitance requirements.
LM219DT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- Open-Collector, Open-Emitter, TTL
- Voltage - Supply, Single/Dual (±):
- 5V ~ 30V, ±2.5V ~ 15V
- :
- 4mV @ ±15V
- Voltage - Input Offset (Max):
- 0.5µA @ ±15V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 11.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 105°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-SO
LM219DT FAQ
1.How can I place an order for LM219DT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM219DT 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 LM219DT reliable?
The price and inventory of LM219DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM219DT is usually 5 days.
3.What payment methods are accepted for LM219DT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM219DT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM219DT?
LM219DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM219DT 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 LM219DT?
For technical support, including LM219DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM219DT requirements.
6.How does Aetrix verify that LM219DT is sourced from the original manufacturer or authorized distributors?
All LM219DT 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 LM219DT meets industry standards.
7.What is the process for return or replacement of LM219DT?
All LM219DT units undergo pre-shipment inspection (PSI). If there is an issue with LM219DT, 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 LM219DT part is unused and in its original packaging.
Return procedure for LM219DT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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