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Analog Devices Inc. LT1671IS8#TRPBF
- Part No.:
- LT1671IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1671IS8#TRPBF.pdf
- Description:
- IC COMPARATOR 1 W/LATCH 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,144
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Product details
Overview
LT1671IS8#TRPBF from Analog Devices (formerly Linear Technology) is a high-speed, low-power, ground-sensing comparator with complementary TTL/CMOS outputs and integrated latch. It delivers 60ns propagation delay at 20mV overdrive, 0.8mV input offset voltage, and operates from single 5V or dual ±5V supplies. It is used in precision zero-crossing detection, high-speed sampling circuits, and current sensing for switching regulators.
For engineers reviewing the LT1671IS8#TRPBF datasheet, LT1671IS8#TRPBF pinout, LT1671IS8#TRPBF application, or LT1671IS8#TRPBF equivalent, key selection considerations include latch timing (tSU = –15ns, tH = 35ns), rail-to-rail input common-mode range (–5V to 3.5V on ±5V), output drive capability (±4mA), and extended temperature operation (–40°C to 85°C).
Technical Context
The LT1671IS8#TRPBF features a PNP differential input stage enabling input voltages to extend 1.5V below V+ and down to V–, with no minimum input slew rate requirement. Its latch function retains output states independently of input transitions when the LATCH pin is high.
Propagation delay is specified under controlled overdrive conditions (e.g., 60ns at 20mV, 85ns at 5mV), with differential delay ∆tPD ≤ 30ns. Output stage provides active pull-up/pull-down for TTL/CMOS loads, minimizing cross-conduction and ensuring stable response even during slow input transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 60ns at 20mV overdrive - enables sub-100ns decision timing in high-speed A/D front-ends. |
| Input Offset Voltage | 0.8mV (typ) - supports precision threshold detection in current-sense and zero-crossing applications. |
| Supply Current | 450µA (typ) - allows battery-powered or low-quiescent designs without sacrificing speed. |
| Input Common-Mode Range | –5V to 3.5V on ±5V supply - permits ground-sensing operation and direct interface to shunt-based current monitors. |
| Latch Setup/Hold Time | tSU = –15ns, tH = 35ns - enables asynchronous latching with minimal timing margin constraints. |
| Output Drive | ±4mA into TTL/CMOS - ensures robust logic-level interfacing without external buffers. |
| Operating Temperature | –40°C to 85°C - qualified for industrial and automotive-adjacent embedded systems. |
Pinout & Package
LT1671IS8#TRPBF is housed in an 8-lead plastic SO (Small Outline) package, 0.150-inch width, RoHS-compliant and tape-and-reel packaged (#TRPBF suffix). Pin 1 is V+, pin 4 is V–, pin 6 is GND, and pins 7–8 provide complementary Q and Q̅ outputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pin 1) | Positive supply input | Accepts 4.6V–5.4V for single-supply operation or up to +7V absolute max; powers internal bias and output stage. |
| +IN (Pin 2) | Noninverting input | Accepts signals down to V– (ground-sensing); inputs exceeding V+ are clamped but non-damaging if current-limited to 10mA. |
| –IN (Pin 3) | Inverting input | Same common-mode range as +IN; differential input voltage rated to ±12V. |
| V– (Pin 4) | Negative supply input | Supports 0V (single supply) or –5V (dual supply); negative supply current is only 75µA (typ). |
| LATCH ENABLE (Pin 5) | Latch control input | TTL/CMOS-compatible; high = latch enabled (outputs hold state), low = transparent mode; no internal hysteresis. |
| GND (Pin 6) | Ground reference | Return path for input bias and output sink currents; must be low-impedance for stable propagation delay. |
| Q OUT (Pin 7) | Noninverting logic output | Active-high when +IN > –IN and LATCH = low; VOH = 2.4V min @ 4mA, VOL = 0.5V max @ –4mA. |
| Q OUT (Pin 8) | Inverting logic output | Complementary to Pin 7; enables direct connection to differential receivers or SR latches without inverters. |
Key Features
| Feature | Design Value |
|---|---|
| No minimum input slew rate | Eliminates need for signal pre-conditioning or slew-rate limiting in slow-transition applications like line receivers. |
| Rail-to-rail input common-mode | Enables direct sensing of signals referenced to ground or negative rails - critical for shunt-based current monitoring. |
| Integrated output latch | Reduces external logic count in sampled-data systems; latch timing fully characterized (tLPD = 60ns, tH = 35ns). |
| Stable operation with passive loads | Active push-pull output stage avoids shoot-through, enabling direct drive of 1MΩ resistive or 50pF capacitive loads. |
| Pin compatibility with LT1394/LT1016/LT1116 | Allows drop-in upgrade path for legacy designs requiring improved offset, latch, or stability without PCB redesign. |
Applications
| High-Speed A/D Converters | Zero-Crossing Detectors |
|---|---|
Use Scenario: Front-end comparator in flash or pipeline ADCs requiring sub-100ns decision latency and precise threshold alignment. IC Role / Device Role / Timing Role: High-speed analog-to-digital decision element with latch-hold capability for sample-and-hold synchronization. Use Value: 60ns propagation delay and 0.8mV offset ensure accurate conversion at ≥10 MSPS with minimal aperture jitter contribution. |
Use Scenario: Detecting AC waveform polarity reversals in motor control, power metering, or audio signal routing. IC Role / Device Role / Timing Role: Ground-sensing comparator with fast recovery from negative overdrive via Schottky clamp support. Use Value: Input common-mode down to V– and no minimum slew rate allow reliable triggering on distorted or low-slew sine waves. |
| Current Sense for Switching Regulators | Fast Pulse Height/Width Discriminators |
Use Scenario: Monitoring shunt voltage across high-side or low-side MOSFETs in DC/DC converters operating at ≥500kHz. IC Role / Device Role / Timing Role: Precision threshold detector with rail-to-rail input enabling direct connection to milliohm shunts. Use Value: 0.8mV offset and 60ns delay support accurate overcurrent protection with <100ns response time and minimal false trips. |
Use Scenario: Identifying valid pulse amplitude or duration in digital communications, laser ranging, or particle detection. IC Role / Device Role / Timing Role: High-speed window comparator building block with latch retention for pulse capture before host processor readout. Use Value: Complementary outputs and latch enable synchronous pulse validation with deterministic timing margins (tSU = –15ns). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1394CS8#PBF | 7ns propagation delay, 6mA supply current, no latch, same 8-pin SO package. | Better speed but higher power; lacks latch functionality - requires external flip-flop for data retention. | Select when raw speed >60ns is mandatory and latch is implemented externally. |
| LT1720IMS8#PBF | Dual-channel, 4.5ns per comparator, 4mA supply current, no latch, MS8 package. | Provides two independent comparators in same footprint; not pin-compatible; no latch per channel. | Choose for space-constrained dual-threshold designs where latch is unnecessary or handled digitally. |
Compared with LT1671IS8#TRPBF, LT1394CS8#PBF trades latch capability and lower quiescent current for higher speed, while LT1720IMS8#PBF offers dual channels at faster speed but requires layout changes and adds complexity for latch-equivalent behavior.
Availability
LT1671IS8#TRPBF is available at Aetrix Electronics and suitable for high-speed sampling circuits, current sense for switching regulators, and zero-crossing detectors requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1671IS8#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, including datasheets, SPICE models, and application notes for legacy Linear parts.
The LT1671IS8#TRPBF belongs to Linear's high-speed precision comparator family, designed specifically for ground-sensing, latch-enabled, low-power applications in industrial control, power conversion, and test equipment.
FAQ
What is the operating temperature range for LT1671IS8#TRPBF?
The LT1671IS8#TRPBF is specified and guaranteed over –40°C to +85°C, with all electrical parameters tested across this extended industrial temperature range. This distinguishes it from the commercial-grade LT1671CS8 (0°C to 70°C) and confirms its suitability for demanding environments such as motor drives and outdoor instrumentation where thermal stability is critical. The LT1671IS8#TRPBF maintains 60ns propagation delay and 0.8mV offset across the full range.
Does LT1671IS8#TRPBF require external hysteresis for noise immunity?
No - the LT1671IS8#TRPBF does not integrate internal hysteresis, and external hysteresis is optional depending on application noise levels. Its stable operation with slow input transitions eliminates oscillation risks seen in other fast comparators, reducing reliance on hysteresis. However, for noisy environments like motor current sensing, a small resistor network (e.g., 10MΩ feedback from Q OUT to +IN) can add ~1mV hysteresis without degrading speed. The LT1671IS8#TRPBF datasheet provides design guidance for such configurations.
Can LT1671IS8#TRPBF operate from a single 3.3V supply?
No - the LT1671IS8#TRPBF is not characterized or guaranteed for 3.3V single-supply operation. Its absolute maximum positive supply is 7V, but the electrical specifications (e.g., propagation delay, output swing) are validated only for single 5V (V+ = 5V, V– = 0V) or dual ±5V (V+ = 5V, V– = –5V) supplies. At 3.3V, output voltage swing degrades (VOH drops below 2.0V), and propagation delay increases beyond 110ns. For 3.3V systems, consider the LT1719 or LTC6702 as alternatives. The LT1671IS8#TRPBF requires nominal 5V operation.
How does the latch function behave during power-up or brownout?
During power-up, the LT1671IS8#TRPBF LATCH pin floats high by default (due to internal weak pull-up), placing outputs in latched state until actively driven low. If uncontrolled, this may cause undefined initial output states. To ensure predictable startup, tie LATCH to GND through a 10kΩ resistor or drive it synchronously after V+ stabilizes. During brownout, the latch holds its last valid state as long as V+ remains above ~2.5V and V– stays within spec - verified down to 4.6V supply. The LT1671IS8#TRPBF latch remains functional across its full specified supply range.
Is LT1671IS8#TRPBF pin-compatible with LT1016CN8#PBF?
Yes - the LT1671IS8#TRPBF is explicitly stated in its datasheet as pin-compatible with LT1016, LT1116, and LT1394 in the 8-lead SO package. All share identical pin 1 (V+), pin 2 (+IN), pin 3 (–IN), pin 4 (V–), pin 5 (LATCH/ENABLE), pin 6 (GND), pin 7 (Q), and pin 8 (Q̅) assignments. However, LT1016CN8#PBF lacks a latch pin (pin 5 is unused), so connecting LT1671IS8#TRPBF's LATCH to GND replicates LT1016 transparent behavior. No PCB change is needed for migration, though firmware may require update to manage the latch signal.
LT1671IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- with Latch
- Number of Elements:
- 1
- Output Type:
- CMOS, Complementary, TTL
- Voltage - Supply, Single/Dual (±):
- -
- :
- 2.5mV @ ±5V
- Voltage - Input Offset (Max):
- 0.28µA @ ±5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 800µA
- Current - Quiescent (Max):
- 100dB CMRR, 85dB PSRR
- CMRR, PSRR (Typ):
- 80ns
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SO
LT1671IS8#TRPBF FAQ
1.How can I place an order for LT1671IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1671IS8#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 LT1671IS8#TRPBF reliable?
The price and inventory of LT1671IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1671IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1671IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1671IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1671IS8#TRPBF?
LT1671IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1671IS8#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 LT1671IS8#TRPBF?
For technical support, including LT1671IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1671IS8#TRPBF requirements.
6.How does Aetrix verify that LT1671IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1671IS8#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 LT1671IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1671IS8#TRPBF?
All LT1671IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1671IS8#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 LT1671IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1671IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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