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Analog Devices Inc. LT1719IS8#TRPBF
- Part No.:
- LT1719IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1719IS8#TRPBF.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,214
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Product details
Overview
LT1719IS8#TRPBF from Analog Devices (formerly Linear Technology) is an UltraFast rail-to-rail comparator in SO-8 package, optimized for low-voltage operation with 4.5ns propagation delay at 20mV overdrive, 4.2mA supply current at 3V, and separate input/output supply rails. It delivers TTL/CMOS-compatible outputs and supports industrial temperature range (–40°C to +85°C), making it suitable for high-speed crystal oscillator circuits and level translation in precision timing systems.
For engineers reviewing the LT1719IS8#TRPBF datasheet, LT1719IS8#TRPBF pinout, LT1719IS8#TRPBF application, or LT1719IS8#TRPBF equivalent, key selection criteria include its dual-supply flexibility (VCC/VEE for input stage, +VS/GND for output stage), internal 3.5mV typical hysteresis, shutdown current of 0.1μA, and guaranteed performance across –40°C to +85°C without derating.
Technical Context
The LT1719IS8#TRPBF employs a complementary bipolar process with PNP input stage and rail-to-rail CMOS/TTL-compatible output driver. Its internal hysteresis (2.0–7mV) eliminates oscillation with slow-moving inputs, while separate input (VCC/VEE) and output (+VS/GND) supplies enable independent analog input range and logic-level translation - e.g., ±5V input stage driving 3V logic output.
Propagation delay remains stable across 2.7–6V output supply and 2.7–10.5V input supply ranges, with skew <1.5ns between rising/falling edges. Input common-mode range extends from VEE – 0.1V to VCC – 1.2V, supporting operation with negative input rails down to –5V (VEE = –5V) while maintaining valid output polarity even when one input exceeds common-mode limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 4.5ns at 20mV overdrive (25°C, VEE = 0V); enables sub-5ns timing-critical sampling and zero-crossing detection |
| Supply Voltage Range | VCC–VEE: 2.7V to 10.5V; +VS–GND: 2.7V to 6V - allows ±5V input with 3V output or single 5V rail operation |
| Input Offset Voltage | 0.4–3.5mV (max) - ensures accurate threshold detection in discriminators and level translators |
| Hysteresis Voltage | 2.0–7mV (typ 3.5mV) - provides noise immunity without external feedback components |
| Shutdown Current | 0.1μA max - extends battery life in portable instrumentation and sensor wake-up circuits |
| Output Drive | VOH = +VS – 0.4V (4mA sink), VOL = 0.4V (10mA source) - directly interfaces to 3V/5V TTL/CMOS loads |
| Operating Temperature | –40°C to +85°C (I-grade) - qualified for industrial control, motor drives, and automotive body electronics |
Pinout & Package
LT1719IS8#TRPBF uses an 8-lead plastic SOIC (SO-8) package, 1.27mm pitch, 5.0mm × 4.0mm footprint, 1.75mm max height, RoHS-compliant lead-free finish.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Positive input-stage supply | Bias for PNP differential pair; sets upper common-mode limit (VCC – 1.2V) |
| 2 (+IN) | Noninverting input | High-impedance node (IB ≤ –2.5μA); accepts signals down to VEE – 0.1V |
| 3 (–IN) | Inverting input | Matches +IN characteristics; differential input voltage tolerance up to ±7V |
| 4 (VEE) | Negative input-stage supply / substrate reference | Defines lower common-mode limit (VEE – 0.1V); must be ≤ GND per absolute max rating |
| 5 (GND) | Ground reference for output stage | Return path for +VS supply; tied to system ground in most configurations |
| 6 (SHDN) | Active-high shutdown control | Pull to +VS to disable; draws <0.1μA in shutdown; threshold ≈ +VS – 1.4V |
| 7 (OUT) | Rail-to-rail CMOS/TTL output | Sinks 10mA / sources 4mA; rise/fall times <2.5ns into 10pF load |
| 8 (+VS) | Positive output-stage supply | Defines VOH/VOL swing; independent of VCC/VEE - enables level translation |
Key Features
| Feature | Design Value |
|---|---|
| UltraFast propagation | 4.5ns delay at 20mV overdrive - meets timing budgets in >200MHz sampling clocks and delay lines |
| Dual independent supplies | VCC/VEE for input stage, +VS/GND for output stage - enables analog front-end isolation from digital logic domains |
| Rail-to-rail output | VOH ≥ +VS – 0.4V, VOL ≤ 0.4V - eliminates level-shifter ICs when interfacing to 3V/5V microcontrollers |
| Internal hysteresis | 2.0–7mV band - prevents chatter on noisy or slowly slewing inputs without external resistors |
| Low-power shutdown | 0.1μA disabled current - reduces system standby power in battery-operated oscilloscopes and data loggers |
Applications
| Crystal Oscillator Circuits | Level Translators |
|---|---|
|
Use Scenario: Sustaining oscillation in AT-cut quartz crystals (1–10MHz) with low phase noise and fast startup. IC Role / Device Role / Timing Role: High-gain, low-delay comparator forming Pierce oscillator feedback loop with symmetric drive capability. Use Value: 4.5ns propagation delay minimizes oscillator jitter; rail-to-rail output ensures full-swing TTL/CMOS clock generation without external buffers. |
Use Scenario: Converting ±5V analog thresholds to 3.3V logic levels for FPGA or ARM processor GPIO inputs. IC Role / Device Role / Timing Role: Precision threshold detector with programmable hysteresis and independent input/output supply rails. Use Value: Separate VCC/VEE and +VS supplies allow direct interface between –5V sensor signals and 3.3V digital logic without level-shifting ICs. |
| Threshold Detectors | High-Speed Sampling Circuits |
|
Use Scenario: Detecting overvoltage/undervoltage conditions in DC-DC converter feedback loops with noise immunity. IC Role / Device Role / Timing Role: Hysteresis-equipped comparator providing clean digital flag for protection circuitry. Use Value: 3.5mV typical internal hysteresis rejects <10mV noise spikes; 0.4mV offset ensures accurate trip point setting within ±1mV tolerance. |
Use Scenario: Latching analog sample-and-hold triggers in high-speed ADC front-ends (e.g., 100+ MSPS). IC Role / Device Role / Timing Role: Low-skew (<1.5ns), low-jitter (11ps RMS) edge detector synchronizing sampling clocks. Use Value: 4.5ns delay and 0.5ns skew guarantee precise aperture timing; 2.2ns fall time preserves signal integrity into 50Ω transmission lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH7322MA/NOPB | Single-supply only (2.7–12V); no separate input/output rails; 4.5ns delay but higher 8.5mA supply current at 5V | Lacks VCC/VEE/+VS flexibility - unsuitable for level translation between disparate voltage domains | Prefer LT1719IS8#TRPBF when dual-supply isolation or industrial temperature range is required |
| ADCMP572BCPZ-R7 | Fixed 3.3V supply only; 2.5ns delay; ECL/PECL output (not TTL/CMOS); requires external termination | Designed for RF/microwave sampling; incompatible with standard logic families without translators | Choose LT1719IS8#TRPBF for TTL/CMOS compatibility, wider supply range, and integrated hysteresis |
Compared with LMH7322MA/NOPB and ADCMP572BCPZ-R7, the LT1719IS8#TRPBF uniquely combines ultrafast response, rail-to-rail TTL/CMOS output, internal hysteresis, and true dual-supply architecture - enabling single-component solutions for level translation, oscillator sustainment, and industrial threshold detection where supply domain isolation is critical.
Availability
LT1719IS8#TRPBF is available at Aetrix Electronics and suitable for crystal oscillator circuits, high-speed sampling systems, and industrial threshold detectors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1719IS8#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1719IS8#TRPBF belongs to ADI's legacy Linear Technology UltraFast comparator family, designed specifically for timing-critical applications demanding sub-5ns propagation, low power, and robust operation across industrial temperature ranges.
FAQ
What is the maximum allowable supply voltage difference between VCC and VEE for LT1719IS8#TRPBF?
The absolute maximum rating for VCC – VEE is 12V, but the recommended operating range is 2.7V to 10.5V per the Electrical Characteristics table. Exceeding 10.5V may cause parametric degradation or reliability risk, even if within absolute maximum limits. For LT1719IS8#TRPBF in industrial applications, maintain VCC – VEE ≤ 10.5V to ensure guaranteed 4.5ns propagation delay and 0.4–3.5mV offset voltage performance.
Can LT1719IS8#TRPBF operate with VEE tied to –5V while +VS is at 3.3V?
Yes - LT1719IS8#TRPBF explicitly supports this configuration. With VEE = –5V and +VS = 3.3V, the input stage operates from –5V to VCC (e.g., 0V or 5V), while the output stage swings rail-to-rail between 0V (GND) and 3.3V. This enables direct interfacing of negative-going analog signals to 3.3V logic. The LT1719IS8#TRPBF datasheet confirms VEE ≤ GND and +VS ≤ 6V, making –5V/3.3V a fully supported dual-supply mode.
Does LT1719IS8#TRPBF require external hysteresis for reliable operation with slow-moving inputs?
No - LT1719IS8#TRPBF includes 2.0–7mV internal hysteresis, eliminating the need for external positive feedback resistors in most applications. This built-in hysteresis stabilizes output against noise and prevents oscillation with input slew rates as low as 1V/s. External hysteresis is only required when >7mV total hysteresis is needed, using the resistor network shown in Figure 4 of the LT1719IS8#TRPBF datasheet.
What is the output behavior of LT1719IS8#TRPBF during shutdown?
When SHDN is pulled high (≥ +VS – 0.5V), LT1719IS8#TRPBF disables both input and output stages: inputs become high-impedance (>100MΩ), and OUT enters high-impedance state (ZOUT ≥ 10kΩ within 75ns). The device draws ≤ 0.1μA total supply current. This behavior is confirmed in the Electrical Characteristics table under "Disabled Supply Currents" and "tOFF" parameter for LT1719IS8#TRPBF.
Is LT1719IS8#TRPBF pin-compatible with other comparators in the LT17xx family?
No - LT1719IS8#TRPBF has a unique SO-8 pinout (VCC, +IN, –IN, VEE, GND, SHDN, OUT, +VS) not shared by LT1720/LT1721 (dual/quad variants) or LT1716 (single comparator with different supply scheme). Pin compatibility is not claimed in the LT1719IS8#TRPBF datasheet. Substitution requires PCB layout revision due to differing pin functions, especially the dedicated +VS and VEE pins absent in other LT17xx packages.
LT1719IS8#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:
- 1
- Output Type:
- CMOS, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 6V
- :
- 2.5mV @ ±5V
- Voltage - Input Offset (Max):
- 6µA @ ±5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 9mA
- Current - Quiescent (Max):
- 70dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 13ns
- Propagation Delay (Max):
- 7mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SO
LT1719IS8#TRPBF FAQ
1.How can I place an order for LT1719IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1719IS8#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 LT1719IS8#TRPBF reliable?
The price and inventory of LT1719IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1719IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1719IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1719IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1719IS8#TRPBF?
LT1719IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1719IS8#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 LT1719IS8#TRPBF?
For technical support, including LT1719IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1719IS8#TRPBF requirements.
6.How does Aetrix verify that LT1719IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1719IS8#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 LT1719IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1719IS8#TRPBF?
All LT1719IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1719IS8#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 LT1719IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1719IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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