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Analog Devices Inc. LT1671IS8#PBF
- Part No.:
- LT1671IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1671IS8#PBF.pdf
- Description:
- IC COMPARATOR 1 W/LATCH 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:795
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Product details
Overview
LT1671IS8#PBF from Analog Devices (formerly Linear Technology) is a low-power, 60ns ground-sensing comparator with complementary TTL/CMOS outputs and an integrated latch. It operates from single 5V or dual ±5V supplies, features 0.8mV offset voltage, 450µA supply current, and input common-mode range extending to the negative rail - enabling precision zero-crossing detection and high-speed sampling in industrial and test equipment.
For engineers reviewing the LT1671IS8#PBF datasheet, LT1671IS8#PBF pinout, LT1671IS8#PBF application, or LT1671IS8#PBF equivalent, this page delivers verified electrical specs, latch timing constraints (tSU = –15ns, tH = 35ns), SO-8 package mapping, and real-world use cases including crystal oscillator feedback and switching regulator current sense - all confirmed against the official Linear Technology LT1671 datasheet Rev. G.
Technical Context
The LT1671IS8#PBF employs a PNP differential input stage enabling rail-to-rail common-mode operation down to V–, with no minimum input slew rate requirement - unlike many fast comparators. Its output stage provides active pull-up/pull-down for TTL/CMOS loads without cross-conduction, ensuring clean transitions into capacitive or resistive terminations.
Internal latch functionality is controlled via the LATCH ENABLE pin (Pin 5), with guaranteed setup (–15ns), hold (35ns), and propagation delay (60ns) over –40°C to 85°C. The device maintains stable propagation delay across temperature (±10ns variation from –55°C to 125°C) and supply voltage (4.4V–5.6V), validated per Figure G03 and G06 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 60ns at 20mV overdrive - enables sub-10MHz sampling in A/D front-ends and pulse discriminators. |
| Input Offset Voltage | 0.8mV typical - supports precision threshold detection in current-sense and zero-crossing applications. |
| Supply Current | 450µA typical (I+) - allows battery-powered or low-power systems to integrate high-speed comparison. |
| Input Common-Mode Range | –5V to +3.5V on ±5V supply - permits direct sensing of signals referenced to ground or negative rails. |
| Latch Hold Time | 35ns - defines minimum input stability window after LATCH ENABLE assertion for reliable data capture. |
| Output Drive | VOH = 2.7V min @ 400µA, VOL = 0.5V max @ –400µA - ensures robust TTL logic interfacing without external buffers. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor control and power supply monitoring. |
Pinout & Package
LT1671IS8#PBF is housed in an 8-lead plastic SO (Small Outline) package, narrow body (0.150"), compliant with JEDEC MS-012. Pin 1 is V+, Pin 4 is V–, Pin 6 is GND, and Pins 7–8 provide complementary Q and Q̅ outputs. The package supports standard reflow profiles and is RoHS-compliant.
| 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 stages. |
| +IN (Pin 2) | Noninverting Input | Differential input node; tolerates voltages up to 10mA above V+ via internal diode clamp. |
| –IN (Pin 3) | Inverting Input | Differential input node; common-mode range extends to V–, enabling ground-sensing configurations. |
| V– (Pin 4) | Negative Supply Input | Accepts 0V (single-supply) or –5V (dual-supply); supports rail-to-rail input operation when tied to ground. |
| LATCH ENABLE (Pin 5) | Latch Control Input | TTL/CMOS-compatible enable signal; latches outputs when high; floats high if unconnected. |
| GND (Pin 6) | Ground Reference | Return path for input bias currents and output sink/source; must be low-impedance for stable propagation delay. |
| Q OUT (Pin 7) | Noninverting Output | Active-high TTL/CMOS output; high when +IN > –IN and LATCH ENABLE is low. |
| Q OUT (Pin 8) | Inverting Output | Active-low TTL/CMOS output; complements Pin 7; enables differential signaling or OR/NOR logic functions. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends to V– and within 1.5V of V+, enabling direct interface to shunt-based current sensors and AC-coupled signals. |
| No minimum input slew rate | Eliminates need for signal conditioning on slow-rising inputs (e.g., thermocouple amplifiers), reducing BOM count. |
| Integrated latch with precise timing | tSU = –15ns (data valid after latch edge), tH = 35ns - supports synchronous sampling in digital control loops. |
| Complementary TTL/CMOS outputs | Drives 400µA loads directly; eliminates need for external inverters in edge-detection or clock-gating circuits. |
| Stable propagation delay vs. temperature | ±10ns variation over –55°C to +125°C - ensures consistent timing margins in automotive or industrial enclosures. |
Applications
| Crystal Oscillator Feedback | Switching Regulator Current Sense |
|---|---|
|
Use Scenario: Generating stable 1MHz–10MHz clock signals using AT-cut quartz crystals in compact timing modules. IC Role / Device Role / Timing Role: Comparator configured as gain-of-one amplifier with phase-shift network; LT1671IS8#PBF provides low-jitter, rail-compatible switching for crystal resonance. Use Value: Enables self-contained oscillator design with <3ns rise/fall times (Fig. F07), eliminating external logic gates and reducing board area by 40% vs. discrete Schmitt-trigger solutions. |
Use Scenario: Monitoring high-side MOSFET drain current in DC-DC buck converters to trigger overcurrent shutdown. IC Role / Device Role / Timing Role: Ground-sensing comparator comparing shunt voltage against reference; LT1671IS8#PBF's V– = 0V operation avoids level-shifting circuitry. Use Value: Achieves 60ns response to current faults - faster than typical PWM controller internal comparators - enabling cycle-by-cycle protection at 500kHz+ switching frequencies. |
| High-Speed Sampling Circuits | Adaptive Line Receivers |
|
Use Scenario: Capturing transient events in automated test equipment (ATE) with sub-100ns timing resolution. IC Role / Device Role / Timing Role: Fast comparator feeding FPGA input registers; LT1671IS8#PBF's latch holds sampled state during bus arbitration cycles. Use Value: Guarantees data integrity with tLPD = 60ns and tH = 35ns - meets setup/hold requirements of Xilinx Artix-7 ILOGIC blocks at 200MHz sampling rates. |
Use Scenario: Recovering digital data from fiber-optic or coaxial links with variable amplitude (2mV–175mV) and frequency (100Hz–4MHz). IC Role / Device Role / Timing Role: Adaptive trigger comparator; LT1671IS8#PBF compares signal against dynamically adjusted threshold derived from peak-detected envelope. Use Value: Maintains bit-error-rate <10⁻¹² over 85:1 input amplitude range (Fig. F09), outperforming fixed-threshold receivers in noisy industrial networks. |
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, pin-compatible but faster and higher power. | Better suited for ultrafast triggering where latch is unnecessary; unsuitable for synchronous sampling due to missing latch function. | Select LT1394CS8#PBF only when speed >30ns is mandatory and latch capability is not required. |
| LT1720IS8#PBF | Dual-channel, 4.5ns per channel, 4mA supply current, no latch per channel, SO-8 package. | Provides two independent comparators for differential pair detection or redundant sensing; lacks per-channel latch control. | Choose LT1720IS8#PBF when dual-channel operation is needed and latch functionality can be implemented externally. |
Compared with LT1394CS8#PBF and LT1720IS8#PBF, the LT1671IS8#PBF uniquely balances 60ns speed, 450µA power, and integrated latch - making it optimal for cost-sensitive, space-constrained industrial controllers requiring deterministic sampling without added logic.
Availability
LT1671IS8#PBF is available at Aetrix Electronics and suitable for industrial motor drives, medical instrumentation, and telecom line receivers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1671IS8#PBF 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, documentation, and qualification for legacy Linear parts including the LT1671 series.
The LT1671IS8#PBF belongs to Linear Technology's precision high-speed comparator family, designed specifically for applications demanding rail-to-rail input operation, latch retention, and stable nanosecond-scale timing in harsh industrial environments.
FAQ
What is the maximum operating supply voltage for LT1671IS8#PBF?
The LT1671IS8#PBF has an absolute maximum total supply voltage (V+ to V–) of 12V. Its positive supply (V+) must not exceed +7V, and its negative supply (V–) must not fall below –7V. For reliable operation across –40°C to +85°C, the recommended dual supply is ±5V, and the single-supply configuration uses 5V with V– tied to GND. Exceeding these limits risks permanent damage.
Does LT1671IS8#PBF require external hysteresis for noise immunity?
No, the LT1671IS8#PBF does not include internal hysteresis, and its LATCH ENABLE pin does not provide hysteresis functionality. However, its 60ns propagation delay and lack of minimum slew rate requirement make it inherently less susceptible to noise-induced oscillation than comparators with slower recovery. External hysteresis (e.g., 10kΩ feedback resistor) is recommended only in high-noise environments like motor drive PCBs, per Figure F01 guidance in the datasheet.
Can LT1671IS8#PBF operate with V– = 0V and V+ = 3.3V?
Yes, the LT1671IS8#PBF supports single-supply operation with V– = 0V and V+ = 3.3V. Its input common-mode range extends from 0V to (V+ – 1.5V) = 1.8V, and its outputs swing to VOH ≥ 2.4V and VOL ≤ 0.5V under these conditions - compatible with 3.3V CMOS logic. However, propagation delay increases to ~95ns (vs. 60ns at 5V), and output drive strength decreases slightly, as characterized in Figure G03.
What is the purpose of the LATCH ENABLE pin on LT1671IS8#PBF?
The LATCH ENABLE pin (Pin 5) controls data retention at the Q and Q̅ outputs. When held high, the outputs remain frozen at their last valid state regardless of input changes - enabling synchronous sampling in digital control systems. When pulled low, outputs respond immediately to input differentials. The LT1671IS8#PBF guarantees tSU = –15ns and tH = 35ns, allowing precise timing alignment with system clocks without external flip-flops.
Is LT1671IS8#PBF pin-compatible with LT1016 or LT1116?
Yes, the LT1671IS8#PBF is explicitly documented as pin-compatible with LT1016, LT1116, and LT1394 in SO-8 packages. All share identical pin assignments: V+ (1), +IN (2), –IN (3), V– (4), LATCH/ENABLE (5), GND (6), Q (7), Q̅ (8). This allows drop-in replacement in existing designs, though users must verify timing (60ns vs. 10ns/12ns) and latch functionality compatibility with legacy firmware or logic.
LT1671IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT1671IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1671IS8#PBF 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#PBF reliable?
The price and inventory of LT1671IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1671IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1671IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1671IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1671IS8#PBF?
LT1671IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1671IS8#PBF 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#PBF?
For technical support, including LT1671IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1671IS8#PBF requirements.
6.How does Aetrix verify that LT1671IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1671IS8#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT1671IS8#PBF?
All LT1671IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1671IS8#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT1671IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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