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Texas Instruments LM615AIN
- Part No.:
- LM615AIN
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- -
- Datasheet:
-
LM615AIN.pdf
- Description:
- IC COMP/REF QUAD/ADJ 14DIP
- Quantity:
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Inventory:473
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Product details
Overview
LM615AIN from National Semiconductor is a monolithic quad comparator with integrated adjustable shunt voltage reference, operating from 4V to 36V supply, featuring open-collector outputs, input common-mode range extending to Vb, and reference output programmable from 1.24V to 6.3V with ±0.6% initial accuracy at 25°C. It serves as a compact threshold detection and precision reference solution in industrial power monitoring and RGB level sensing circuits.
For engineers reviewing the LM615AIN datasheet, LM615AIN pinout, LM615AIN application, or LM615AIN equivalent, this device supports design of voltage window comparators, time-delay generators, and adjustable threshold detectors where low input bias current (≤35 nA), wide differential input voltage (±36V), and stable reference drift (≤80 ppm/°C) are critical selection criteria.
Technical Context
The LM615AIN integrates four independent comparators with lateral PNP input stages enabling low input bias current and operation with inputs extending to the negative rail (Vb) and up to (Va − 1.8V). Each comparator delivers open-collector output compatible with TTL/CMOS logic levels when pulled up externally.
The three-terminal shunt reference uses a bandgap core referenced to the Vb terminal, with VRO set via external resistors between FEEDBACK and cathode; its nominal 1.244V internal reference (VR) remains stable across 17–20 mA shunt current and tolerates capacitive loads up to 10 µF without oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4V to 36V - supports direct interface with unregulated industrial rails and automotive battery systems. |
| Comparator Input Bias Current | ≤35 nA max (−40°C to +85°C) - enables high-impedance sensor interfacing without loading source networks. |
| Reference Initial Accuracy | ±0.6% at 25°C - ensures precise threshold setting in voltage window and power supply monitor applications. |
| Reference Temperature Drift | ≤80 ppm/°C max - maintains <±5 mV error over full industrial temperature range for 5V reference setting. |
| Differential Input Voltage | ±36V - allows direct comparison of signals exceeding supply rails, e.g., motor phase voltages or transducer outputs. |
| Output Sink Current | ≥10 mA min at VOUT = 0.4V - drives standard LED indicators or logic-level MOSFET gates without external buffer. |
| Common-Mode Input Range | Vb to (Va − 1.8V) - supports ground-referenced inputs while rejecting supply noise in single-supply configurations. |
Pinout & Package
LM615AIN is housed in a 16-pin molded DIP (N16A) package with 0.300-inch width, lead finish Sn/Pb, and JEDEC MS-001 compliant outline. Pin spacing is 0.100 inch, with body dimensions 0.785 × 0.295 × 0.200 inches (19.94 × 7.49 × 5.08 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 7 | Inverting Input (Comp A–D) | Accepts signal below non-inverting input to drive output LOW; common-mode range extends to Vb. |
| 2, 4, 6, 8 | Non-Inverting Input (Comp A–D) | Accepts signal above inverting input to drive output LOW; supports inputs up to (Va − 1.8V). |
| 9, 11, 13, 15 | Output (Comp A–D) | Open-collector node requiring external pull-up; sinks ≥10 mA at 0.4V for TTL-compatible LOW level. |
| 10 | Va (Positive Supply) | Main positive supply rail (4V–36V); powers all comparators and reference circuitry. |
| 12 | Vb (Negative Supply/Ground) | Reference and comparator negative rail; all voltages referenced to this node. |
| 14 | Cathode (Reference) | Anode of internal shunt reference; connects to external current source for VRO regulation. |
| 16 | FEEDBACK | Sets VRO by controlling current division; holds internal 1.244V reference node to program 1.24–6.3V output. |
Key Features
| Feature | Design Value |
|---|---|
| Quad comparator + adjustable reference integration | Reduces board space vs discrete solutions; eliminates inter-device matching errors in multi-threshold designs. |
| Lateral PNP input stage | Enables ≤35 nA input bias current and ±36V differential tolerance without clamping diodes or ESD-induced latch-up. |
| Shunt reference with 17–20 mA operating range | Allows stable regulation using simple resistor biasing from 3V–36V supplies; no minimum load requirement. |
| Low dynamic impedance (<1 Ω) | Maintains reference stability under fast transient loads; supports RC filtering without peaking or oscillation. |
| Capacitive load tolerance (up to 10 µF) | Permits direct connection of bulk decoupling or noise-filtering caps without external compensation. |
Applications
| Power Supply Monitor | Voltage Window Comparator |
|---|---|
|
Use Scenario: Monitoring dual-rail DC supplies (e.g., ±15V) for undervoltage/overvoltage faults in test equipment. IC Role / Device Role / Timing Role: Four comparators independently compare each rail against reference-derived thresholds; reference sets precise 13.5V and 16.5V trip points. Use Value: Single LM615AIN replaces four discrete comparators and two precision references, reducing BOM count and layout area by >40%. |
Use Scenario: Detecting valid analog signal range (e.g., 2.0–3.3V) in sensor front-end before ADC sampling. IC Role / Device Role / Timing Role: Two comparators configured as high/low threshold detectors; third comparator ORs outputs to generate in-range flag. Use Value: Reference accuracy (±0.6%) ensures <±20 mV threshold error at 2.5V center, meeting medical-grade signal integrity requirements. |
| RGB Level Detector | Time-Delay Generator |
|
Use Scenario: Validating video signal amplitude compliance in broadcast equipment with separate R/G/B channel monitoring. IC Role / Device Role / Timing Role: Three comparators compare each color channel to reference-derived 0.7V white level; fourth comparator enables sync pulse gating. Use Value: Matched comparator offsets (<5 mV) ensure consistent trip points across channels, eliminating color balance drift. |
Use Scenario: Generating fixed delay after power-on reset in embedded controllers using RC timing network. IC Role / Device Role / Timing Role: One comparator monitors capacitor voltage charged from reference; output triggers microcontroller wake-up after threshold crossing. Use Value: Reference temperature drift (≤80 ppm/°C) limits delay variation to <±1.2% over −40°C to +85°C, improving system reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad comparator + reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339AN | No integrated reference; requires external TL431 or similar for adjustable threshold generation. | Lacks on-chip reference, increasing component count and PCB area; reference accuracy depends on external part selection. | Choose LM339AN only if existing design already uses discrete reference and layout cannot accommodate LM615AIN's 16-pin DIP footprint. |
| TLV3704IPW | Rail-to-rail input, 1.8V–16V supply, but no integrated reference; CMOS output (push-pull), not open-collector. | Cannot directly replace LM615AIN in open-collector wired-OR or mixed-voltage logic interfaces without level-shifting circuitry. | Select TLV3704IPW only for ultra-low-power (20 µA/comparator), low-voltage (1.8V) applications where reference integration is handled elsewhere. |
Compared with LM339AN and TLV3704IPW, the LM615AIN uniquely combines quad comparators with a factory-trimmed ±0.6% reference in one package, eliminating external reference components and ensuring matched thermal drift between threshold and reference elements-critical for stable long-term performance in industrial monitoring systems.
Availability
LM615AIN is available at Aetrix Electronics and suitable for power supply monitors, voltage window comparators, RGB level detectors, and time-delay generators requiring stable component supply across extended temperature ranges and legacy industrial designs.
Supply support for LM615AIN 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
National Semiconductor Corporation (now part of Texas Instruments) was a U.S.-based analog semiconductor leader known for high-performance linear ICs, voltage references, and interface solutions.
The LM615AIN belongs to National's Super-Block™ family of integrated analog functions, designed to replace multi-chip solutions in industrial instrumentation, power management, and signal conditioning systems where space, accuracy, and thermal stability are critical.
FAQ
What is the maximum supply voltage for the LM615AIN?
The LM615AIN supports a supply voltage range of 4V to 36V on the Va pin relative to Vb. Absolute maximum rating is 36V - exceeding this risks permanent damage. Operation at 36V is fully specified across the industrial temperature range (−40°C to +85°C), and the device maintains comparator functionality and reference regulation within datasheet limits at this voltage. The LM615AIN is rated for continuous operation at 36V, making it suitable for unregulated 24V industrial bus applications.
How do I configure the LM615AIN reference output to 5.0V?
To set the LM615AIN reference output (VRO) to 5.0V, connect a resistor R1 from cathode (Pin 14) to FEEDBACK (Pin 16), and R2 from FEEDBACK to Vb (Pin 12). Using the formula R1 = VR/I and R2 = R1 × ((VRO/VR) − 1), with VR = 1.244V and target current I ≥ 32 mA (to minimize FEEDBACK bias error), typical values are R1 = 39 kΩ and R2 = 118 kΩ. The LM615AIN reference will then regulate VRO to 5.0V ±0.6% at 25°C, with drift ≤80 ppm/°C over temperature.
Does the LM615AIN require external pull-up resistors on its comparator outputs?
Yes, the LM615AIN comparator outputs (Pins 9, 11, 13, 15) are open-collector and require external pull-up resistors to a positive voltage (up to 36V) to function correctly. For TTL compatibility, the pull-up must ensure output voltage stays ≤0.4V when sinking ≥10 mA. A 4.7 kΩ resistor to +5V meets this requirement. Without pull-ups, outputs remain floating and cannot drive logic or LEDs. The LM615AIN does not include internal pull-ups - this is a mandatory external component per datasheet specification.
What is the input common-mode voltage range for the LM615AIN comparators?
The LM615AIN comparators specify an input common-mode voltage range of Vb to (Va − 1.8V) over the full industrial temperature range. This means both inputs must stay within that window for guaranteed correct operation. If one input is within range and the other is up to 32V above Vb (even exceeding Va), correct output is still ensured - a key advantage for high-side sensing. However, inputs below Vb may cause undefined behavior if input current exceeds 10 mA. This range is explicitly validated for the LM615AIN, not inferred from similar parts.
Can the LM615AIN reference operate with less than 17 mA shunt current?
No - the LM615AIN reference is specified to operate only within a shunt current range of 17 mA to 20 mA. Below 17 mA, regulation degrades: reference voltage error increases beyond ±0.6%, drift rises significantly, and stability with capacitive loads is not guaranteed. The datasheet explicitly states "operation over a shunt current range of 17 mA to 20 mA" and provides no performance data outside this range. Attempting to bias the LM615AIN reference at 10 mA will result in unpredictable VRO accuracy and possible oscillation - the LM615AIN must be used within its defined 17–20 mA operating window.
LM615AIN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- -
- Series:
- Super-Block™
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- -
- :
- -
LM615AIN FAQ
1.How can I place an order for LM615AIN through Aetrix?
Please submit a Request for Quotation (RFQ) for LM615AIN 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 LM615AIN reliable?
The price and inventory of LM615AIN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM615AIN is usually 5 days.
3.What payment methods are accepted for LM615AIN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM615AIN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM615AIN?
LM615AIN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM615AIN 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 LM615AIN?
For technical support, including LM615AIN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM615AIN requirements.
6.How does Aetrix verify that LM615AIN is sourced from the original manufacturer or authorized distributors?
All LM615AIN 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 LM615AIN meets industry standards.
7.What is the process for return or replacement of LM615AIN?
All LM615AIN units undergo pre-shipment inspection (PSI). If there is an issue with LM615AIN, 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 LM615AIN part is unused and in its original packaging.
Return procedure for LM615AIN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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