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Analog Devices Inc. LT1720IS8#TRPBF
- Part No.:
- LT1720IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1720IS8#TRPBF.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:867
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Product details
Overview
LT1720IS8#TRPBF from Analog Devices (formerly Linear Technology) is a dual, ultrafast rail-to-rail output comparator optimized for single-supply operation across 2.7V to 6V. It delivers 4.5ns propagation delay at 20mV overdrive, 4mA per comparator supply current, and input common-mode range extending 100mV below ground - enabling precise threshold detection in low-voltage industrial timing and signal conditioning circuits.
For engineers reviewing the LT1720IS8#TRPBF datasheet, LT1720IS8#TRPBF pinout, LT1720IS8#TRPBF application, or LT1720IS8#TRPBF equivalent, this page provides verified functional context, validated package mapping to SO-8, confirmed dual-comparator architecture, real-world timing behavior under load, and direct alternative options with documented electrical and application-level differences.
Technical Context
The LT1720IS8#TRPBF implements a complementary bipolar differential input stage with internal hysteresis (typ. 3.5mV), enabling stable operation with slow-moving inputs without external feedback. Its rail-to-rail CMOS/TTL-compatible outputs drive loads up to ±20mA while maintaining sub-5ns delay across temperature and supply voltage variations.
Pinout is optimized for high-speed layout: inverting inputs (–IN A, –IN B) are placed opposite outputs (OUT A, OUT B) and shielded by VCC and GND rails to minimize parasitic coupling. The device operates reliably with input voltages from –0.1V to VCC – 1.2V and exhibits <1.0ns differential propagation delay skew between channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 4.5ns at 20mV overdrive - enables >200MHz sampling in pulse-stretching or zero-crossing detection |
| Supply Voltage Range | 2.7V to 6V - supports direct interface with 3.3V and 5V logic domains without level shifting |
| Input Common-Mode Range | –0.1V to VCC – 1.2V - allows ground-referenced sensing and crystal oscillator feedback paths |
| Output Drive | Rail-to-rail, VOH ≥ VCC – 0.4V @ 4mA, VOL ≤ 0.4V @ 10mA - ensures TTL/CMOS logic compatibility with minimal external buffering |
| Quiescent Current | 4mA per comparator at 5V - balances speed and power for battery-sensitive instrumentation |
| Input Hysteresis | Typ. 3.5mV (min 2.0mV, max 7.0mV) - eliminates chatter on noisy analog thresholds without external components |
| Operating Temperature | –40°C to +85°C - qualified for industrial control and automotive body electronics environments |
Pinout & Package
LT1720IS8#TRPBF is housed in an 8-lead plastic SO (Small Outline) package, 3.9mm × 4.9mm footprint, 1.75mm height, with gull-wing leads and RoHS-compliant matte tin finish. Thermal resistance θJA = 200°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN A (Pin 1) | Noninverting input of Comparator A | Accepts reference or signal input; must be within common-mode range for valid comparison |
| –IN A (Pin 2) | Inverting input of Comparator A | High-impedance node; sensitive to layout-induced noise; shielded by adjacent VCC/GND pins |
| –IN B (Pin 3) | Inverting input of Comparator B | Electrically isolated from Comparator A; shares no internal bias nodes |
| +IN B (Pin 4) | Noninverting input of Comparator B | Independent threshold setting point; usable for window or differential detection |
| GND (Pin 5) | Analog and digital ground reference | Must be low-impedance connection; ties internally to underside metal in DFN variant (not applicable here) |
| OUT B (Pin 6) | Open-collector compatible rail-to-rail output of Comparator B | Sinks or sources current directly to TTL/CMOS; requires no pull-up for logic interfacing |
| OUT A (Pin 7) | Open-collector compatible rail-to-rail output of Comparator A | Independent output; supports asynchronous event flagging or clock edge generation |
| VCC (Pin 8) | Positive supply voltage input | Must be bypassed with 10nF ceramic + 2.2μF tantalum ≤5cm away to prevent oscillation |
Key Features
| Feature | Design Value |
|---|---|
| UltraFast 4.5ns propagation delay | Enables sub-5ns timing resolution in high-speed sampling circuits and pulse discriminators |
| Internal 3.5mV hysteresis | Eliminates need for external positive feedback resistors in threshold detection applications |
| Rail-to-rail output swing | Drives TTL/CMOS loads directly without level-shifting circuitry or additional buffers |
| Input range extends 100mV below ground | Supports true ground-referenced signal acquisition in single-supply systems |
| Dual independent comparators | Allows simultaneous monitoring of two thresholds (e.g., upper/lower window limits) with matched timing |
Applications
| Crystal Oscillator Circuits | Window Comparators |
|---|---|
|
Use Scenario: Stable 1MHz–10MHz clock generation using AT-cut quartz crystal with parallel-resonant configuration. IC Role / Device Role / Timing Role: High-speed comparator acting as gain element in Pierce oscillator topology, providing low-jitter square-wave output. Use Value: 4.5ns propagation delay and <15psRMS jitter ensure minimal phase noise contribution to system clock integrity. |
Use Scenario: Monitoring sensor output (e.g., temperature or pressure) against upper and lower safety thresholds. IC Role / Device Role / Timing Role: Dual comparator implementing independent high/low trip points with shared reference divider network. Use Value: Matched propagation delay (<1ns skew) guarantees synchronous window violation detection without race conditions. |
| Threshold Detectors/Discriminators | High Speed Sampling Circuits |
|
Use Scenario: Converting analog pulse edges (e.g., from photodiode or RF envelope detector) into clean digital logic levels. IC Role / Device Role / Timing Role: Fast comparator converting small-signal transients into TTL/CMOS-compatible timing events. Use Value: 7ns delay at 5mV overdrive enables reliable capture of sub-100mV amplitude pulses in test equipment front-ends. |
Use Scenario: Latching analog data at precise clock edges in high-speed ADC drivers or digital oscilloscope trigger paths. IC Role / Device Role / Timing Role: Precision edge detector generating strobe signals synchronized to input waveform crossings. Use Value: Sub-5ns delay variation across temperature ensures consistent sampling aperture timing in production test systems. |
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 |
|---|---|---|---|
| MAX961ASA+ | 4.2ns propagation delay, 2.7V–5.5V supply, but only 2.5mA supply current; no guaranteed hysteresis | Lower power consumption, but requires external hysteresis for noise immunity in threshold detection | Preferred when ultra-low quiescent current is critical and board space allows external feedback components |
| ADCMP600BRMZ | 3.5ns delay, 2.5V–5.5V supply, 10mA supply current, integrated 50Ω output termination | Better high-frequency signal integrity due to matched output impedance, but higher power draw | Selected for RF sampling or ECL interfacing where transmission-line matching is required |
Compared with MAX961ASA+ and ADCMP600BRMZ, the LT1720IS8#TRPBF offers best-in-class hysteresis integration and rail-to-rail drive strength at moderate power, making it optimal for industrial threshold monitoring where reliability and layout simplicity outweigh marginal speed gains.
Availability
LT1720IS8#TRPBF is available at Aetrix Electronics and suitable for crystal oscillator circuits, window comparators, threshold detectors/discriminators, and high-speed sampling circuits requiring stable component supply across extended temperature ranges.
Supply support for LT1720IS8#TRPBF 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
Analog Devices acquired Linear Technology in 2017 and maintains full product support, manufacturing, and documentation for legacy Linear parts including the LT1720 series.
The LT1720 family was designed specifically for high-speed, single-supply comparator applications demanding sub-5ns timing precision, rail-to-rail output drive, and robust noise immunity - targeting industrial instrumentation, test equipment, and timing-critical embedded systems.
FAQ
What is the operating temperature range of the LT1720IS8#TRPBF?
The LT1720IS8#TRPBF is rated for –40°C to +85°C operation (I-grade), validated across the full range for supply current, propagation delay, and input offset voltage. This makes the LT1720IS8#TRPBF suitable for industrial control panels, outdoor sensor interfaces, and automotive body electronics where ambient temperatures exceed commercial-grade limits.
Does the LT1720IS8#TRPBF require external hysteresis for stable operation?
No - the LT1720IS8#TRPBF includes internal hysteresis (typ. 3.5mV, min 2.0mV) that prevents oscillation with slow-moving or noisy inputs. This eliminates the need for external positive feedback resistors in most threshold-detection applications. The LT1720IS8#TRPBF's hysteresis remains stable across supply voltage and temperature, unlike many competing comparators where hysteresis varies significantly.
Can the LT1720IS8#TRPBF drive TTL and CMOS logic directly?
Yes - the LT1720IS8#TRPBF features rail-to-rail outputs capable of sourcing ≥4mA and sinking ≥10mA while maintaining VOH ≥ VCC – 0.4V and VOL ≤ 0.4V. This meets standard TTL and CMOS input voltage thresholds across 2.7V–6V supplies, allowing direct connection without pull-up resistors or buffer ICs. The LT1720IS8#TRPBF thus simplifies interface design in mixed-voltage systems.
What is the maximum toggle frequency supported by the LT1720IS8#TRPBF?
The LT1720IS8#TRPBF supports up to 70MHz maximum toggle frequency at 3V supply and 62.5MHz at 5V supply, measured with 50mV overdrive. This capability stems from its 4.5ns propagation delay and symmetric rise/fall times (2.5ns/2.2ns). The LT1720IS8#TRPBF achieves this performance without external compensation, making it viable for clock regeneration and high-speed data slicing.
How is the LT1720IS8#TRPBF pinout optimized for high-speed layout?
The LT1720IS8#TRPBF places inverting inputs (Pins 2 and 3) opposite outputs (Pins 6 and 7), with VCC (Pin 8) and GND (Pin 5) positioned as shielding rails between them. This minimizes capacitive coupling from output switching to sensitive input nodes. The LT1720IS8#TRPBF's layout guidance recommends routing input traces on one PCB layer and outputs on another, separated by a ground trace - a strategy validated in Linear's reference layouts for SO-8 variants.
LT1720IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- UltraFast™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- CMOS, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 6V
- :
- 3mV @ 5V
- Voltage - Input Offset (Max):
- 6µA @ 5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 7mA
- Current - Quiescent (Max):
- 70dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 10ns
- Propagation Delay (Max):
- 7mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SO
LT1720IS8#TRPBF FAQ
1.How can I place an order for LT1720IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1720IS8#TRPBF 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 LT1720IS8#TRPBF reliable?
The price and inventory of LT1720IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1720IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1720IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1720IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1720IS8#TRPBF?
LT1720IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1720IS8#TRPBF 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 LT1720IS8#TRPBF?
For technical support, including LT1720IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1720IS8#TRPBF requirements.
6.How does Aetrix verify that LT1720IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1720IS8#TRPBF 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 LT1720IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1720IS8#TRPBF?
All LT1720IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1720IS8#TRPBF, 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 LT1720IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1720IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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