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Texas Instruments LP239D
- Part No.:
- LP239D
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- -
- Datasheet:
-
LP239D.pdf
- Description:
- QUAD COMPARATOR
- Quantity:
- Payment:
- Shipping:
Inventory:466
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Product details
Overview
LP239D from Texas Instruments is an obsolete low-power quadruple voltage comparator IC designed for single-supply operation across 3 V to 30 V, featuring 60 µA typical supply current, ±2 mV input offset voltage, ±0.5 nA input offset current, and 30 mA output sink capability at VO = 2 V - used in battery-powered limit detection and analog-to-digital conversion circuits.
For engineers reviewing the LP239D datasheet, LP239D pinout, LP239D application, or LP239D equivalent, this page delivers verified technical context, package mapping, functional alternatives, and supply-status clarity for legacy design continuity and obsolescence mitigation.
Technical Context
The LP239D implements four independent p-n-p input stage comparators with uncommitted open-collector outputs, enabling wired-OR logic and flexible pull-up voltage selection up to 36 V. Its bimodal output stage delivers 30 mA sink current above 1.5 V (Darlington mode) and ~700 µA below 0.4 V (ground-emitter mode).
It supports common-mode input voltages from ground to VCC − 2 V, operates over −25°C to 85°C, and features reverse-voltage protected power inputs. Input bias current is −2.5 nA typ at 25°C, and large-signal differential gain exceeds 500 V/mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 30 V - enables direct interface with 5 V, 12 V, and 24 V industrial rails without regulation. |
| Quiescent Supply Current | 60 µA typ - supports multi-year battery life in portable threshold-detection systems. |
| Input Offset Voltage | ±2 mV max at 25°C - ensures accurate 10-bit-equivalent decision thresholds at 5 V reference. |
| Output Sink Current | 30 mA at VO = 2 V - directly drives LEDs, small relays, or TTL/CMOS inputs without external buffers. |
| Common-Mode Input Range | 0 V to VCC − 2 V - allows ground-referenced sensing and rail-to-rail input compatibility. |
| Input Offset Current | ±0.5 nA typ - minimizes voltage error in high-impedance sensor interfaces (e.g., thermistors, photodiodes). |
| Operating Temperature | −25°C to 85°C - qualified for commercial and extended-temperature industrial environments. |
Pinout & Package
LP239D is housed in a 14-pin SOIC (D package), 3.90 mm wide, with standard JEDEC MO-153 outline and 1.27 mm pitch. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 5, 6 | IN+ (Comparator 1–4 non-inverting inputs) | Accepts analog signals up to VCC − 2 V; high-impedance p-n-p input stage minimizes loading. |
| 3, 4, 8, 9 | IN− (Comparator 1–4 inverting inputs) | Differential input pair; supports bidirectional voltage comparison with ±36 V max differential rating. |
| 7 | VCC | Positive supply input; reverse-voltage protected up to −0.3 V; accepts 3–30 V DC. |
| 14 | GND | Reference return for all comparators and internal bias network; must be low-impedance. |
| 13, 12, 10, 11 | OUT (Comparator 1–4 open-collector outputs) | Uncommitted collector outputs - require external pull-up; support wired-AND logic and mixed-voltage interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 60 µA typ across full 3–30 V supply range - eliminates need for shutdown control in always-on monitoring. |
| Ground-sensing input stage | Common-mode range includes 0 V - enables direct interface with grounded sensors (e.g., RTDs, strain gauges). |
| Bimodal output architecture | 30 mA sink @ VO ≥ 1.5 V + 700 µA sink @ VO ≤ 0.4 V - provides robust drive across logic thresholds without external transistors. |
| Single-supply CMOS compatibility | Output compatible with 3.3 V/5 V CMOS logic families - simplifies level-shifting in mixed-signal systems. |
| Pin-for-pin replacement | Direct drop-in for LM239, LM339, and LM2901 in SOIC-D footprint - enables legacy board reuse with no layout change. |
Applications
| Battery Voltage Monitor | Industrial Limit Switch Interface |
|---|---|
|
Use Scenario: Detecting low-battery condition in portable medical devices using a resistive divider on a 9 V alkaline supply. IC Role / Device Role / Timing Role: Quadruple comparator configured as window detector and undervoltage lockout (UVLO) circuit. Use Value: 60 µA supply current extends operational life; ground-referenced inputs simplify sensing without level shifters. |
Use Scenario: Converting 4–20 mA current-loop signals from pressure transmitters into digital alarm flags for PLC input cards. IC Role / Device Role / Timing Role: Precision threshold comparator translating analog process signals into discrete high/low logic states. Use Value: ±2 mV offset voltage ensures <0.1% full-scale error at 5 V reference; open-collector outputs interface directly with 24 V PLC inputs. |
| LED Status Indicator Driver | Simple A/D Converter (Flash Type) |
|
Use Scenario: Driving red/green/yellow status LEDs on HVAC control panels based on temperature band thresholds. IC Role / Device Role / Timing Role: Four independent comparators each controlling one LED via direct sink connection. Use Value: 30 mA per output eliminates external drivers; bimodal output maintains brightness across varying LED forward voltages. |
Use Scenario: Building a 4-bit flash ADC for panel meter display using resistor ladder and LP239D as parallel comparator array. IC Role / Device Role / Timing Role: Simultaneous analog voltage comparison against 15 reference levels generated by precision divider. Use Value: 1.3 µs typical response time enables >300 kSPS sampling; low input bias current prevents ladder network loading errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quadruple comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339DR | Higher input offset voltage (±5 mV max), wider temp range (0°C to 70°C), same SOIC-D package and pinout. | Not rated for −25°C operation; suitable for cost-sensitive commercial equipment but not extended-temperature industrial use. | Select when full LP239D temperature spec is unnecessary and RoHS-compliant active production is required. |
| LP2901DR | Wider operating temperature (−40°C to 85°C), identical electrical specs, same SOIC-D package and pinout. | Replaces LP239D in automotive and harsh-environment designs where extended cold-start performance is critical. | Preferred upgrade path for new designs needing LP239D functionality with guaranteed availability and enhanced thermal qualification. |
Compared with LP239D, LM339DR offers active supply but relaxed offset and temperature specs, while LP2901DR matches all key parameters and extends qualification to −40°C - making it the most functionally complete modern alternative for legacy-compatible designs requiring long-term sourcing.
Availability
LP239D is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial alarm systems, and legacy PCB repair requiring stable component supply despite its obsolete status.
Supply support for LP239D 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 headquartered in Dallas, Texas, delivering analog, embedded processing, and logic solutions since 1930.
The LP239D belongs to TI's legacy low-power comparator family, engineered specifically for single-supply, low-quiescent-current sensing in portable and industrial control systems.
FAQ
Is LP239D still in production?
No - LP239D is officially obsolete and no longer manufactured by Texas Instruments. Aetrix Electronics maintains limited legacy stock for repair and continuity programs, with full traceability and documentation. For new designs, LP2901DR is the recommended functional replacement with identical pinout and enhanced temperature rating.
What is the correct pinout for LP239D?
The LP239D uses a standard 14-pin SOIC-D package with pin 1 at the beveled corner. Pin assignments are: 1/2/5/6 = IN+, 3/4/8/9 = IN−, 7 = VCC, 14 = GND, and 13/12/10/11 = OUT1–OUT4. This matches LM239, LM339, and LP2901 in the same package, enabling direct substitution.
Can LP239D operate from a 3.3 V supply?
Yes - LP239D supports 3 V minimum supply voltage. At 3.3 V, it maintains full functionality including ground-sensing inputs and open-collector outputs compatible with 3.3 V CMOS logic, though output saturation voltage rises slightly versus 5 V operation.
What is the maximum output sink current of LP239D?
LP239D delivers 30 mA typical sink current when output voltage is ≥2 V (Darlington mode), and ~700 µA when output voltage drops to 0.4 V (ground-emitter mode). This bimodal behavior ensures reliable logic-level transitions and direct LED/relay driving without external components.
Does LP239D require external pull-up resistors on its outputs?
Yes - all four outputs of LP239D are open-collector and require external pull-up resistors to define logic-high voltage. Pull-up can connect to any supply within 3–36 V, independent of VCC, enabling mixed-voltage system interfacing such as 5 V logic driving 24 V PLC inputs.
LP239D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Number of Elements:
- -
- Output Type:
- -
- Voltage - Supply, Single/Dual (±):
- -
- :
- -
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- -
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- :
- -
LP239D FAQ
1.How can I place an order for LP239D through Aetrix?
Please submit a Request for Quotation (RFQ) for LP239D 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 LP239D reliable?
The price and inventory of LP239D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP239D is usually 5 days.
3.What payment methods are accepted for LP239D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP239D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP239D?
LP239D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP239D 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 LP239D?
For technical support, including LP239D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP239D requirements.
6.How does Aetrix verify that LP239D is sourced from the original manufacturer or authorized distributors?
All LP239D 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 LP239D meets industry standards.
7.What is the process for return or replacement of LP239D?
All LP239D units undergo pre-shipment inspection (PSI). If there is an issue with LP239D, 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 LP239D part is unused and in its original packaging.
Return procedure for LP239D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP239D Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
-
LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
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LM2901PWR
Texas Instruments
-
LM2903DT
STMicroelectronics
-
LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
-
NCX2200GMAZ
NXP Semiconductors
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