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Texas Instruments SN74HCS139QPWRQ1
- Part No.:
- SN74HCS139QPWRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HCS139QPWRQ1.pdf
- Description:
- IC DECODER/DEMUX 1X2:4 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,860
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Product details
Overview
SN74HCS139QPWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified dual 2-to-4 line decoder/demultiplexer with Schmitt-trigger inputs, operating from 2 V to 6 V supply, delivering ±7.8-mA output drive at 6 V, and featuring typical ICC of 100 nA for ultra-low-power bus selection in vehicle control modules.
For engineers reviewing the SN74HCS139QPWRQ1 datasheet, SN74HCS139QPWRQ1 pinout, SN74HCS139QPWRQ1 application, or SN74HCS139QPWRQ1 equivalent, key selection criteria include its automotive temperature range (–40°C to +125°C), Schmitt-trigger noise immunity, dual independent enable-controlled decoding channels, and TSSOP-16 package compatibility with space-constrained ECUs.
Technical Context
This device implements two independent CMOS 2:4 decoders, each with active-low strobe (G) enabling/disabling all four outputs simultaneously. Each channel decodes binary address inputs (A0, A1) to assert exactly one low-level output (Y0–Y3) when enabled - ideal for chip-select routing in shared-data-bus memory systems.
Schmitt-trigger inputs provide hysteresis (ΔVT = 0.6 V min at 6 V), allowing reliable operation with slow-rising or noisy control signals common in automotive harness environments. Balanced push-pull outputs support bidirectional current sourcing/sinking up to ±7.8 mA at 6 V while maintaining VOH ≥ 5.4 V and VOL ≤ 0.33 V under full load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports direct interface with 3.3-V and 5-V microcontrollers and legacy 12-V system rails via LDOs. |
| Operating Temperature | –40°C to +125°C (Grade 1) - qualified for engine bay, transmission control, and ADAS ECU placement. |
| Output Drive Strength | ±7.8 mA at 6 V - sufficient to directly drive multiple CMOS inputs or small LED indicators without external buffers. |
| Propagation Delay | 6 ns typical at 6 V - enables reliable timing in sub-100-MHz address decode paths with tight setup/hold margins. |
| Input Hysteresis (ΔVT) | 0.6 V minimum at 6 V - rejects >600 mV peak-to-peak noise on address or enable lines in electrically harsh vehicles. |
| Quiescent Supply Current | 100 nA typical - reduces standby power in always-on modules such as body control units and gateway controllers. |
| ESD Rating | HBM Level 2 (±4 kV), CDM Level C6 (±1.5 kV) - meets AEC-Q100 stress test requirements for production automotive use. |
Pinout & Package
TSSOP-16 package (5.00 mm × 4.40 mm), 1.2-mm max height, lead-free NIPDAU finish, MSL Level-1, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | 1G / 2G | Active-low enable for Channel 1 / Channel 2 - drives all four outputs high when asserted; required for channel isolation in multi-device select schemes. |
| 2, 14 / 3, 13 | 1A0 / 1A1 / 2A0 / 2A1 | Binary address inputs per channel - define which of Y0–Y3 goes low; Schmitt-triggered to tolerate slow edge rates from mechanical switches or LIN transceivers. |
| 4–7 / 12–9 | 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs - sink current when selected; push-pull structure allows driving capacitive loads up to 50 pF while meeting timing specs. |
| 8 | GND | Ground reference - must be low-impedance connection; layout requires solid ground plane beneath device for EMI suppression. |
| 16 | VCC | Positive supply - requires local 0.1-μF ceramic bypass capacitor placed within 2 mm of pin to suppress switching transients. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for continuous operation from –40°C to +125°C ambient, supporting under-hood and transmission-mounted applications. |
| Schmitt-trigger input hysteresis | Enables robust decoding of slow or noisy signals (e.g., from potentiometers, relays, or long-wire sensors) without external RC filtering. |
| Dual independent decode channels | Allows simultaneous control of two separate 4-device groups (e.g., sensor clusters and actuator banks) using shared address lines and discrete enables. |
| Ultra-low static current | 100 nA typical ICC eliminates measurable impact on battery drain in always-on vehicle subsystems like telematics and alarm monitoring. |
| CMOS push-pull outputs | Provides symmetrical sourcing/sinking capability (±7.8 mA at 6 V), eliminating need for external pull-ups in open-drain configurations. |
Applications
| Engine Control Unit (ECU) Memory Mapping | ADAS Camera Module Select Logic |
|---|---|
|
Use Scenario: Selecting among four flash memory devices sharing a common data bus in a diesel engine ECU with limited GPIO resources. IC Role / Device Role / Timing Role: Dual decoder routes microcontroller address bits to individual chip-select lines; strobe inputs synchronize selection with write-enable pulses. Use Value: Reduces required MCU pins by 6 (vs. discrete GPIOs), maintains <6 ns propagation delay margin for 25-MHz SPI clock domains, and withstands crank voltage dips down to 2 V. |
Use Scenario: Enabling one of four image sensor interfaces in a surround-view camera hub, where address lines originate from a low-speed CAN-connected controller. IC Role / Device Role / Timing Role: Converts slow, noise-prone CAN-derived address signals into clean, fast chip-select asserts for MIPI CSI-2 receivers. Use Value: Schmitt-trigger inputs reject >600 mV EMI from adjacent power converters; ±7.8-mA drive ensures reliable logic levels across 10-cm PCB traces to sensor connectors. |
| Body Control Module (BCM) I/O Expansion | Electric Power Steering (EPS) Diagnostic Port Multiplexing |
|
Use Scenario: Expanding microcontroller I/O to manage eight discrete loads (e.g., door locks, mirror heaters, seat motors) using two 4-output groups. IC Role / Device Role / Timing Role: Acts as address-decoded driver enable logic; outputs directly sink load currents up to 7.8 mA per channel. Use Value: Eliminates need for external transistor arrays; 100 nA quiescent current preserves battery life during vehicle sleep mode (≤10 μA total system draw). |
Use Scenario: Routing diagnostic commands from a central gateway to one of four EPS motor control boards via shared UART lines. IC Role / Device Role / Timing Role: Decodes gateway address bits to assert unique enable on each EPS board's UART receiver, preventing bus contention. Use Value: Dual-channel independence allows concurrent diagnostics on two boards; TSSOP-16 footprint fits dense EPS module layouts with <5 mm clearance constraints. |
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 |
|---|---|---|---|
| SN74HCS139QDRQ1 | SOIC-16 package (9.9 mm × 3.9 mm); identical electrical specs and AEC-Q100 Grade 1 qualification. | Better suited for through-hole prototyping or legacy PCBs with SOIC footprints; higher thermal resistance (RθJA = 122.2°C/W vs. 141.2°C/W). | Select when board layout already uses SOIC-16 or when manual soldering is required in low-volume repair scenarios. |
| MC74HC139ADTR2G | Non-automotive grade (no AEC-Q100); wider VCC range (2–6 V), but only rated for –55°C to +125°C industrial temp; HBM ESD = ±2 kV. | Acceptable for non-safety-critical cabin electronics (e.g., infotainment accessories) but not for powertrain or ADAS functions. | Choose only for cost-sensitive consumer-grade automotive add-ons where full AEC-Q100 compliance is not mandated by OEM. |
Compared with SN74HCS139QPWRQ1, the SOIC variant offers mechanical robustness and easier rework, while the MC74HC139ADTR2G trades automotive qualification for lower unit cost - making the TSSOP version optimal for new ECU designs prioritizing space, thermal performance, and full automotive compliance.
Availability
SN74HCS139QPWRQ1 is available at Aetrix Electronics and suitable for engine control units, ADAS camera hubs, body control modules, and electric power steering systems requiring stable component supply across automotive production lifecycles.
Supply support for SN74HCS139QPWRQ1 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 leader specializing in analog, embedded processing, and automotive-grade logic solutions, with decades of automotive qualification expertise and broad manufacturing scale.
The SN74HCS139QPWRQ1 belongs to TI's HCS logic family - designed specifically for low-power, noise-immune automotive signal routing where reliability across extreme temperatures and EMI resilience are mandatory.
FAQ
What is the maximum capacitive load SN74HCS139QPWRQ1 can drive while maintaining specified propagation delay?
The SN74HCS139QPWRQ1 is characterized with CL = 50 pF in its switching characteristics table. At this load, propagation delay remains ≤14 ns at 6 V. Driving larger capacitances increases tpd nonlinearly - for example, 100 pF raises delay to ~22 ns. To maintain timing integrity in high-speed buses, keep trace + input capacitance ≤50 pF or add series termination resistors to dampen ringing.
Does SN74HCS139QPWRQ1 support mixed-voltage operation between input and output sides?
No, SN74HCS139QPWRQ1 does not support mixed-voltage operation. All inputs and outputs are referenced to the same VCC rail (2–6 V). Input thresholds (VT+ and VT−) scale with VCC, and output VOH/VOL specifications assume the same supply. Interfacing with 1.8-V or 2.5-V logic requires level-shifting circuitry external to the SN74HCS139QPWRQ1.
Can unused inputs on SN74HCS139QPWRQ1 be left floating?
No, unused inputs on SN74HCS139QPWRQ1 must never be left floating. TI's datasheet mandates termination to VCC or GND to prevent undefined states, increased current consumption, and potential oscillation. For example, if only Channel 1 is used, tie 2A0, 2A1, and 2G to GND or VCC depending on desired default state - 10-kΩ pull-up/down resistors are acceptable for flexibility.
How does the Schmitt-trigger input architecture improve noise immunity in SN74HCS139QPWRQ1?
The SN74HCS139QPWRQ1 achieves noise immunity via input hysteresis (ΔVT), which creates separate voltage thresholds for rising (VT+) and falling (VT−) edges. At 6 V supply, ΔVT is ≥0.6 V - meaning noise spikes must exceed 600 mV peak-to-peak to cause false triggering. This allows reliable operation with slow-switching signals from hall-effect sensors or mechanical switches in high-EMI vehicle environments.
Is SN74HCS139QPWRQ1 pin-compatible with legacy 74HC139 devices?
Yes, SN74HCS139QPWRQ1 is functionally and pin-compatible with standard 74HC139 devices in TSSOP-16 (PW) package, including identical pinout, logic behavior, and DC specs. However, it adds Schmitt-trigger inputs, lower ICC (100 nA vs. ~2 µA), and AEC-Q100 qualification - making it a drop-in upgrade for automotive redesigns requiring enhanced noise immunity and qualification.
SN74HCS139QPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCS
- 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:
- 7.8mA, 7.8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74HCS139QPWRQ1 FAQ
1.How can I place an order for SN74HCS139QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCS139QPWRQ1 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 SN74HCS139QPWRQ1 reliable?
The price and inventory of SN74HCS139QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCS139QPWRQ1 is usually 5 days.
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Once your SN74HCS139QPWRQ1 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 SN74HCS139QPWRQ1?
For technical support, including SN74HCS139QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCS139QPWRQ1 requirements.
6.How does Aetrix verify that SN74HCS139QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74HCS139QPWRQ1 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 SN74HCS139QPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74HCS139QPWRQ1?
All SN74HCS139QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCS139QPWRQ1, 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 SN74HCS139QPWRQ1 part is unused and in its original packaging.
Return procedure for SN74HCS139QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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