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Texas Instruments SN74AHCT139QPWRQ1
- Part No.:
- SN74AHCT139QPWRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT139QPWRQ1.pdf
- Description:
- AUTOMOTIVE DUAL 2-LINE TO 4-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:4,348
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Product details
Overview
SN74AHCT139QPWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive dual 2-line-to-4-line decoder/demultiplexer with TTL-compatible inputs, 4.5V–5.5V supply operation, 9.6ns max propagation delay at 5V/50pF, and active-low enable control - used for memory decoding and bus-select logic in engine control units and ADAS domain controllers.
For engineers reviewing the SN74AHCT139QPWRQ1 datasheet, SN74AHCT139QPWRQ1 pinout, SN74AHCT139QPWRQ1 application, or SN74AHCT139QPWRQ1 equivalent, key selection criteria include automotive temperature range (–40°C to +125°C), wettable-flank TSSOP-16 package compatibility with AOI inspection, latch-up immunity (>250mA), and dual independent decode channels with separate strobe inputs.
Technical Context
This device implements two independent positive-logic 2-to-4 decoders, each with fully buffered inputs and active-low enable (G) controlling all four outputs. Each channel accepts binary address inputs (A0, A1) and drives one of four low-active outputs (Y0–Y3) when enabled.
It uses balanced CMOS push-pull outputs capable of ±8mA drive at 5V, supports TTL-level input thresholds (VIH = 2V, VIL = 0.8V), and features clamping diodes on all inputs and outputs per JESD78. The design minimizes system decoding delay in high-speed memory interfaces where decoder tpd is less than memory access time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - ensures stable operation across automotive battery transients and regulator tolerances. |
| Propagation Delay (tPD) | ≤9.6ns max at VCC = 5V, CL = 50pF - enables use in sub-100MHz address decoding paths without timing penalty. |
| Output Drive | ±8mA at VOH/VOL - sufficient to directly drive multiple 74-series inputs or small-signal MOSFET gates. |
| Input Thresholds | VIH = 2.0V, VIL = 0.8V - guarantees interoperability with legacy 5V TTL logic families. |
| Operating Temperature | –40°C to +125°C (Grade 1) - qualified for under-hood and powertrain ECU environments. |
| ESD Rating | HBM ±2000V, CDM ±1000V - meets AEC-Q100-002 and -011 requirements for automotive assembly robustness. |
| Latch-up Immunity | >250mA per JESD17 - prevents destructive latch-up during transient overvoltage events. |
Pinout & Package
SN74AHCT139QPWRQ1 is supplied in a 16-pin TSSOP (PW) package measuring 5mm × 6.4mm with 0.65mm lead pitch. The package includes wettable flanks for automated optical inspection (AOI) of solder joints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-low enable input (per channel) | Strobe control: pulls all four outputs high-impedance when high; enables decoding when low. |
| 1A0, 1A1 / 2A0, 2A1 | Binary address inputs (per channel) | Selects one of four active-low outputs (Y0–Y3) per decoder using standard 2-bit encoding. |
| 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs (per channel) | Each output goes low only when its channel is enabled and its address matches; all others remain high. |
| VCC (Pin 16) | Positive supply | Must be bypassed with 0.1µF ceramic capacitor placed adjacent to pin for noise suppression. |
| GND (Pin 8) | Ground reference | Common return path for all I/O and supply currents; requires low-impedance PCB plane connection. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for continuous operation from –40°C to +125°C ambient, supporting engine bay and transmission control applications. |
| Wettable flank TSSOP package | Enables reliable AOI-based solder joint inspection on production lines without X-ray, reducing defect escape risk. |
| TTL-compatible inputs | Accepts standard 5V TTL logic levels without level-shifting, simplifying integration with legacy microcontrollers and FPGAs. |
| Dual independent decoders | Two functionally isolated 2:4 decode blocks allow concurrent addressing of separate peripheral groups (e.g., sensor banks or memory banks). |
| Low dynamic power consumption | ICC ≤ 40µA at 5.5V and 25°C - reduces quiescent current in always-on vehicle subsystems. |
Applications
| Engine Control Unit (ECU) Memory Mapping | ADAS Camera Sensor Hub |
|---|---|
|
Use Scenario: Selecting among eight discrete SRAM or EEPROM devices sharing a common data/address bus in a multi-core powertrain controller. IC Role / Device Role / Timing Role: Dual decoder provides chip-select signals for up to eight memory ICs using only four GPIO pins (two address + two enables), minimizing MCU pin count. Use Value: Enables deterministic, low-latency memory access with tPD < 10ns - avoids pipeline stalls during real-time calibration table lookups. |
Use Scenario: Routing serial camera data streams from four MIPI CSI-2 sensors to two image signal processors based on vehicle mode (parking vs. forward driving). IC Role / Device Role / Timing Role: Acts as a synchronous demultiplexer, steering clock/data lanes using vehicle-state GPIOs while maintaining signal integrity via controlled drive strength. Use Value: Delivers clean, jitter-free enable edges (≤9.6ns skew) critical for MIPI lane synchronization and pixel clock recovery. |
| Automotive Body Control Module (BCM) | Electric Power Steering (EPS) Motor Driver Interface |
|
Use Scenario: Driving indicator LEDs and relays for door lock/unlock, window lift, and mirror fold functions using shared MCU GPIO resources. IC Role / Device Role / Timing Role: Provides discrete low-side switch control signals with built-in current limiting (±8mA) and ESD protection for direct LED/relay coil interfacing. Use Value: Eliminates need for external buffer transistors and pull-down resistors - reduces BOM count and PCB area in space-constrained BCM modules. |
Use Scenario: Enabling/disabling gate drivers for three-phase inverter stages in EPS motor control, synchronized with PWM dead-time logic. IC Role / Device Role / Timing Role: Generates isolated, glitch-free enable pulses for high-side and low-side driver ICs using redundant decode paths for functional safety monitoring. Use Value: Supports ASIL-B decomposition by providing independently controllable enable domains with latch-up immunity >250mA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 2-to-4 decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LV139A-Q1 | Lower VCC range (2.0V–5.5V); higher tPD (13.5ns max); LV-CMOS inputs (VIH = 70% VCC) | Better suited for mixed-voltage systems with 3.3V MCUs; not drop-in compatible with TTL-level sources. | Choose when interfacing with 3.3V controllers and lower power (<10µA ICC) is prioritized over speed. |
| 74AHC139-Q1 | Same pinout and function but AHC logic family: wider VCC (2V–5.5V), faster tPD (7.5ns), no AEC-Q100 Grade 1 rating | Lacks automotive temperature certification; suitable for infotainment or gateway modules with milder thermal profiles. | Choose for non-critical automotive zones where cost and speed outweigh full AEC-Q100 Grade 1 compliance. |
Compared with SN74LV139A-Q1 and 74AHC139-Q1, SN74AHCT139QPWRQ1 uniquely delivers TTL-compatible input thresholds combined with AEC-Q100 Grade 1 qualification - making it the only option for legacy 5V MCU-based powertrain designs requiring guaranteed operation at +125°C ambient.
Availability
SN74AHCT139QPWRQ1 is available at Aetrix Electronics and suitable for engine control units, ADAS sensor hubs, body control modules, and electric power steering systems requiring stable component supply across extended automotive lifecycles.
Supply support for SN74AHCT139QPWRQ1 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in automotive-grade logic, power management, and interface solutions.
The SN74AHCT139QPWRQ1 belongs to TI's automotive-qualified AHCT logic family, designed specifically for high-reliability decoding and demultiplexing in safety-critical vehicle subsystems operating across harsh temperature and EMI environments.
FAQ
What is the maximum capacitive load SN74AHCT139QPWRQ1 can drive while meeting datasheet timing specs?
SN74AHCT139QPWRQ1 is characterized for loads up to 50pF, with guaranteed tPD ≤9.6ns at VCC = 5V and CL = 50pF. Driving larger capacitances increases propagation delay nonlinearly and may cause signal integrity issues; TI recommends limiting total load to ≤50pF for full specification compliance. For heavier loads, consider adding a buffer stage or verifying timing margins in the target application.
Does SN74AHCT139QPWRQ1 support hot insertion or live insertion into a powered system?
No, SN74AHCT139QPWRQ1 does not support hot insertion. Its absolute maximum ratings specify that VCC must be applied before any input or output signals, and VI must remain within –0.5V to VCC + 0.5V at all times. Applying inputs before VCC risks activating internal clamp diodes and exceeding IOK limits, potentially causing latch-up or permanent damage. Always sequence VCC prior to signal application.
Can unused inputs on SN74AHCT139QPWRQ1 be left floating?
No, unused inputs on SN74AHCT139QPWRQ1 must never be left floating. As a CMOS device with TTL-compatible thresholds, floating inputs cause excessive supply current, oscillation, and potential device malfunction. All unused address (A0/A1) and enable (G) inputs must be tied to VCC or GND using direct connections or 10kΩ pull-up/pull-down resistors - per TI's layout guidelines in Section 8.4.2.
Is SN74AHCT139QPWRQ1 pin-compatible with the commercial-grade SN74AHCT139PWR?
Yes, SN74AHCT139QPWRQ1 shares identical pinout, electrical behavior, and package dimensions (TSSOP-16) with SN74AHCT139PWR. The "Q1" suffix denotes AEC-Q100 qualification (Grade 1 temperature, enhanced ESD/latch-up testing), while core functionality and pin mapping are fully preserved - enabling drop-in replacement in automotive designs requiring extended reliability validation.
What thermal considerations apply to SN74AHCT139QPWRQ1 in a sealed automotive enclosure?
SN74AHCT139QPWRQ1 has RθJA = 135.9°C/W in TSSOP-16. In a sealed enclosure at +125°C ambient, self-heating must stay below TJ(max) = 150°C. With typical ICC < 40µA and switching power < 1mW, junction rise is negligible - but ensure GND plane copper area ≥ 250mm² and avoid stacking heat-generating components nearby. No heatsink is required under normal operation.
SN74AHCT139QPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 2:4
- Independent Circuits:
- 2
- Current - Output High, Low:
- 8mA, 8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74AHCT139QPWRQ1 FAQ
1.How can I place an order for SN74AHCT139QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT139QPWRQ1 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 SN74AHCT139QPWRQ1 reliable?
The price and inventory of SN74AHCT139QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT139QPWRQ1 is usually 5 days.
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Once your SN74AHCT139QPWRQ1 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 SN74AHCT139QPWRQ1?
For technical support, including SN74AHCT139QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT139QPWRQ1 requirements.
6.How does Aetrix verify that SN74AHCT139QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT139QPWRQ1 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 SN74AHCT139QPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AHCT139QPWRQ1?
All SN74AHCT139QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT139QPWRQ1, 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 SN74AHCT139QPWRQ1 part is unused and in its original packaging.
Return procedure for SN74AHCT139QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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