SN74LV3T99-Q1 - Automotive Configurable Logic Gate | TI
MPN: SN74LV3T99-Q1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.72 | $0.72 |
| 10 | $0.65 | $6.50 |
| 100 | $0.52 | $52.00 |
| 500 | $0.44 | $220.00 |
| 1,000 | $0.36 | $360.00 |
Drop-in alternatives for SN74LV3T99-Q1 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
SN74LV3T99PWR
β Drop-Inπ Reference alternative (not in catalog)
SN74LV3T99QPWR
β Drop-Inπ Reference alternative (not in catalog)
SN74LV3T99-Q1 Maximum Ratings & Electrical Characteristics
| Function | Configurable multiple-function gate |
| Boolean Function | Y = (A β’ /C + B β’ C) β D |
| Number of Gates | 3 independent gates |
| Inputs per Gate | 4 |
| Output Type | 3-state |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Input Type | Schmitt-trigger |
| Technology Family | LV CMOS |
| Level Shifting | Yes (logic-level shifter function) |
| Operating Temperature | -40C to +125C |
| Automotive Qualification | AEC-Q100 qualified (-Q1) |
| Package | 20-TSSOP (PW) |
| Package Variant | 20-VSSOP (DGS) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Maximum Data Rate | [DATA_NEEDED: maximum data rate] |
| Quiescent Current | [DATA_NEEDED: quiescent current] |
SN74LV3T99-Q1 Pin Configuration
| Pin 1 | 1A β Gate 1 input A |
| Pin 2 | 1B β Gate 1 input B |
| Pin 3 | 1C β Gate 1 select input C |
| Pin 4 | 1D β Gate 1 input D |
| Pin 5 | 1OE β Gate 1 3-state output enable |
| Pin 6 | 1Y β Gate 1 3-state output |
| Pin 7 | GND β Ground |
| Pin 8 | 2A β Gate 2 input A |
| Pin 9 | 2B β Gate 2 input B |
| Pin 10 | 2C β Gate 2 select input C |
| Pin 11 | 2D β Gate 2 input D |
| Pin 12 | 2OE β Gate 2 3-state output enable |
| Pin 13 | 2Y β Gate 2 3-state output |
| Pin 14 | 3A β Gate 3 input A |
| Pin 15 | 3B β Gate 3 input B |
| Pin 16 | 3C β Gate 3 select input C |
| Pin 17 | 3D β Gate 3 input D |
| Pin 18 | 3OE β Gate 3 3-state output enable |
| Pin 19 | 3Y β Gate 3 3-state output |
| Pin 20 | VCC β Power supply, 1.8 V to 5.5 V |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
SN74LV3T99-Q1 is suitable for 6 applications: Automotive Body Control Modules, Automotive Infotainment Systems, Industrial Automation and PLC I/O, Logic-Level Shifting Between Voltage Domains, Bus-Oriented Shared-Resource Logic, Test and Measurement Equipment.
Automotive Body Control Modules
Body control modules combine switch inputs, sensor signals, and microcontroller GPIO in an electrically noisy 12V automotive environment. The SN74LV3T99-Q1 fits because its Schmitt-trigger inputs reject slow switch-transition edges and noise, and its AEC-Q100 qualification with -40C to +125C range meets automotive reliability requirements. The gates are used for signal conditioning, switch debouncing assistance, and implementing custom logic between the MCU and loads, while the configurable Boolean function Y = (A β’ /C + B β’ C) β D consolidates multiple discrete gates into one 20-pin TSSOP device, saving board space in dense BCM layouts.
Recommended
Automotive Infotainment Systems
Infotainment head units mix 1.8V, 3.3V, and 5V logic domains across processors, displays, and audio components. The SN74LV3T99-Q1 fits this application because its 1.8V to 5.5V supply range supports logic-level shifting between domains, and its -Q1 AEC-Q100 rating covers the automotive cabin temperature profile. The three configurable gates with 3-state outputs handle enable gating, multiplexing, and bus isolation in display and audio signal routing, while the Schmitt-trigger inputs clean up slow digital handshaking lines between heterogeneous ICs, reducing spurious interrupt glitches in the tightly packed head-unit PCB.
Recommended
Industrial Automation and PLC I/O
Industrial PLC I/O cards interface noisy field signals with 3.3V or 5V controllers. The SN74LV3T99-Q1 fits because Schmitt-trigger inputs tolerate the slow, noisy edges typical of optocoupler outputs and mechanical sensors, and the 1.8V to 5.5V range allows bridging logic domains on mixed-voltage I/O boards. The three configurable gates implement custom interlock and gating logic per the Boolean function Y = (A β’ /C + B β’ C) β D, while 3-state outputs enable shared status buses. Its CMOS process keeps static power low across the dense I/O rack, and RoHS compliance supports industrial environmental requirements.
Recommended
Logic-Level Shifting Between Voltage Domains
Mixed-voltage systems frequently need to translate control signals between 1.8V, 2.5V, 3.3V, and 5V rails. The SN74LV3T99-Q1 fits because TI explicitly positions it as a configurable multiple-function gate with logic-level shifter capability, supported by its 1.8V to 5.5V operating supply. The Schmitt-trigger inputs accept slow-translating edges without oscillation, a common failure of plain buffers in level-shift roles. Used as a unidirectional translator with buffering gain, it also regenerates signal edges degraded by long PCB traces or cabling, providing clean, fast output transitions into the destination domain's logic.
Recommended
Bus-Oriented Shared-Resource Logic
Systems where multiple drivers share a common data or status bus need 3-state outputs to prevent bus contention. The SN74LV3T99-Q1 fits because each of its three configurable gates provides a 3-state output controlled by an output-enable, allowing high-impedance isolation when a gate is not driving. Combined with the configurable Boolean function, designers can implement multiplexed routing of status bits onto a shared bus within a single 20-pin TSSOP. Schmitt-trigger inputs ensure reliable sampling of bus signals with slow edges, and the LV CMOS family drive strength keeps capacitively loaded bus edges acceptable.
Recommended
Test and Measurement Equipment
Bench instruments and automated test fixtures need flexible routing, gating, and control logic that can be adapted across product variants. The SN74LV3T99-Q1 fits because its configurable gates implement different Boolean functions via pin strapping without redesigning the PCB, shortening derivative development. The 1.8V to 5.5V supply range lets one design instrument signals from 1.8V MCU boards to legacy 5V subsystems, and Schmitt-trigger inputs condition slow or noisy probe-front signals. The -40C to +125C range and RoHS compliance suit both laboratory and environmental-chamber test setups.
Recommended
Recommended Products Summary
Engineering reference data for SN74LV3T99-Q1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74LV3T99PWR | SN74LV3T99QDGSRQ1 | SN74AHC3G99-Q1 |
|---|---|---|---|---|
| Package | 20-TSSOP (PW) | 20-TSSOP (PW) - same | 20-VSSOP (DGS) | [DATA_NEEDED: package] |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Gates / Inputs | 3 gates x 4 inputs | 3 gates x 4 inputs | 3 gates x 4 inputs | 3 gates (fewer inputs per gate) |
| 3-State Outputs | Yes | Yes | Yes | No |
| Supply Voltage Range | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | [DATA_NEEDED: supply range] |
| Schmitt-Trigger Inputs | Yes (all inputs) | Yes (all inputs) | Yes (all inputs) | [DATA_NEEDED] |
| AEC-Q100 Qualification | Yes (-Q1) | No (industrial grade) | Yes (-Q1) | Yes (-Q1) |
| Operating Temperature | -40C to +125C | [DATA_NEEDED: temperature range] | -40C to +125C | [DATA_NEEDED] |
Key Differentiators
- 3-state outputs on every configurable gate (vs SN74AHC3G99-Q1)
- Automotive AEC-Q100 qualification with level-shift capability (vs SN74LV3T99PWR)
- Four inputs per gate enable single-chip multiplexer logic (vs SN74AHCT3G99-Q1)
Design Notes
Place a 0.1uF ceramic decoupling capacitor within 2 mm of the VCC pin (pin 20) to GND, plus one bulk 1uF-4.7uF capacitor per power domain. The LV CMOS family draws dynamic shoot-through current during output transitions; inadequate decoupling causes VCC bounce that can corrupt the Schmitt-trigger threshold margins. Keep gate input traces short when they originate from off-board connectors.
The 3-state outputs require coordinated OE control. Never enable two gates driving the same bus node simultaneously - bus contention exceeds absolute maximum output current and can damage the device. During MCU boot, ensure OE pins are pulled to the disable state with external pull-down/pull-up resistors so outputs stay high-impedance while the controller configures its GPIO. Also tie unused inputs to VCC or GND - floating CMOS inputs cause oscillation and excess quiescent current.
Schmitt-trigger inputs tolerate slow edges, so RC filtering or long unterminated traces are acceptable on inputs. However, configure the C select input per the datasheet truth table before relying on the resulting Boolean function - strapping C to VCC/GND selects different functions of A, B, and D. For level-shift use, verify VIH/VIL thresholds of the receiving domain are met at the intended VCC; the LV family is not TTL-threshold at all supply points.
Compliance Information
-Q1 suffix indicates AEC-Q100 automotive qualification per TI product page. RoHS/lead-free status typical for current TI logic production; REACH and halogen-free status not stated in provided data.
