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Texas Instruments SN74AHC139QWBQBRQ1
- Part No.:
- SN74AHC139QWBQBRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
SN74AHC139QWBQBRQ1.pdf
- Description:
- AUTOMOTIVE DUAL 2-LINE TO 4-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SN74AHC139QWBQBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive dual 2-to-4 line decoder/demultiplexer in wettable-flank WQFN-16 (BQB) package, operating from 2V to 5.5V, with max 10.5ns propagation delay at 5V/50pF, latch-up immunity >250mA, and −40°C to +125°C ambient operation - used for memory chip-select decoding in ADAS domain controllers.
For engineers reviewing the SN74AHC139QWBQBRQ1 datasheet, SN74AHC139QWBQBRQ1 pinout, SN74AHC139QWBQBRQ1 application, or SN74AHC139QWBQBRQ1 equivalent, key selection criteria include automotive qualification status, dual-channel independent enable control, CMOS push-pull output drive capability (±8mA at 5V), low-noise switching performance, and compatibility with shared data bus architectures requiring precise timing coordination.
Technical Context
The SN74AHC139QWBQBRQ1 integrates two independent 2:4 decoders, each with active-low strobe (G) and two address inputs (A1, A0), producing four active-low outputs (Y0–Y3). Outputs are high-impedance when strobe is inactive (high), and one output goes low per binary input combination when strobe is asserted (low).
It employs balanced CMOS push-pull outputs capable of sourcing/sinking up to ±8mA at 5V, supports fast transition rates (≤20 ns/V at 5V), and features standard CMOS inputs with ≤1µA leakage. The device includes clamp diodes on all I/Os and meets AEC-Q100 HBM Class 2 (±2kV) and CDM Class C4B (±1kV) ESD requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 5.5V - supports mixed-voltage system interfacing (e.g., 3.3V MCU driving 5V peripherals) |
| Propagation Delay (tPLH/tPHL) | Max 10.5ns at VCC = 5V, CL = 50pF - enables use in sub-100MHz memory decode paths without timing penalty |
| Output Drive (IOH/IOL) | ±8mA at VCC = 5V - sufficient to directly drive multiple 74AHC inputs or small capacitive loads without buffers |
| Operating Temperature | −40°C to +125°C ambient - qualified for engine bay, transmission control, and ADAS sensor fusion modules |
| ESD Rating | HBM ±2000V, CDM ±1000V - exceeds automotive board-level ESD immunity requirements per ISO 10605 |
| Latch-up Immunity | >250mA per JESD17 - prevents destructive failure during transient overcurrent events in noisy vehicle environments |
| Input Leakage (II) | ±1µA max - ensures stable logic states with high-impedance pull-ups/pull-downs in low-power sleep modes |
Pinout & Package
SN74AHC139QWBQBRQ1 uses a 16-pin wettable-flank QFN (BQB) package measuring 3.5mm × 2.5mm with exposed thermal pad. The package supports automated optical inspection (AOI) via side-fillet solder wetting and allows GND connection of the thermal pad for improved thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-low channel enable | Strobe inputs disable entire channel output (all Yx high) when high; required for cascading or demux mode |
| 1A0, 1A1 / 2A0, 2A1 | Binary address select inputs | Two-bit code selects one of four outputs per channel; compatible with GPIO or address bus LSBs |
| 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs | Each output drives low only when its channel is enabled and address matches; open-drain behavior not supported |
| VCC (Pin 16) | Positive supply | Must be bypassed with 0.1µF ceramic capacitor placed adjacent to pin; powers both decoder channels |
| GND (Pin 8) | Ground reference | Shared return path for all I/Os and internal logic; thermal pad may be connected to GND plane for thermal relief |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive systems requiring −40°C to +125°C operation and robust reliability under thermal cycling |
| Wettable-flank QFN (BQB) | Enables reliable AOI-based solder joint inspection in high-volume automotive PCB assembly |
| Dual independent 2:4 decode channels | Allows simultaneous decoding of two separate address spaces (e.g., memory + peripheral banks) without inter-channel delay coupling |
| Low-noise CMOS push-pull outputs | Minimizes crosstalk in dense routing; dynamic noise margins (VOL(P)/VOH(V)) specified at 5V/50pF for signal integrity validation |
| Fast enable-controlled demultiplexing | Strobe input permits use as 1:4 data router where A0/A1 select destination and G acts as data gate - no external logic needed |
Applications
| ADAS Domain Controller Memory Decoding | Automotive Infotainment SoC Peripheral Selection |
|---|---|
Use Scenario: Selecting between four camera sensor interfaces sharing a MIPI CSI-2 data bus in a surround-view system. IC Role / Device Role: Dual-channel decoder routes SoC's address lines to individual camera chip-select (CS) inputs while enabling time-multiplexed sensor readout. Use Value: Reduces SoC GPIO count by 6 pins versus discrete CS lines; maintains <10.5ns decode latency to preserve frame sync timing. |
Use Scenario: Managing access to four NAND flash devices in a head-unit storage subsystem with shared data/address bus. IC Role / Device Role: SN74AHC139QWBQBRQ1 acts as bank selector, asserting one CS line per NAND die while holding others inactive. Use Value: Enables single-controller multi-die architecture; ±8mA drive strength ensures clean transitions across 10cm PCB traces to flash packages. |
| Electric Powertrain Inverter Gate Driver Enable Sequencing | Automotive Body Control Module (BCM) I/O Expansion |
Use Scenario: Enabling four isolated gate driver ICs in sequence during inverter startup to prevent shoot-through current. IC Role / Device Role: Decoder outputs trigger enable pins of UCC53xx drivers; strobe inputs synchronized to MCU PWM dead-time controller. Use Value: Guarantees monotonic enable sequencing with <11ns skew between outputs; AEC-Q100 rating ensures operation near motor heat sources. |
Use Scenario: Expanding microcontroller GPIOs to manage 16 lighting zones (LED drivers, relays, sensors) in a centralized BCM. IC Role / Device Role: Two SN74AHC139QWBQBRQ1 devices decode 4-bit address bus into 16 discrete control lines for zone-specific drivers. Use Value: Eliminates need for dedicated I/O expander ICs; 2V–5.5V range matches BCM supply rails; wettable flanks support IPC-A-610 Class 3 inspection. |
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 |
|---|---|---|---|
| SN74LV139AQPWRQ1 | Lower voltage range (1.65V–5.5V); slower max delay (15ns at 5V); LV logic family | Better suited for ultra-low-power body electronics; not recommended for high-speed memory decode | Choose when system operates below 2V or requires reduced static current (ICC = 2µA typical) |
| MC74VHC139DT | Industrial temp range only (−40°C to +85°C); no AEC-Q100 qualification; same pinout | Acceptable for non-safety-critical infotainment modules but fails automotive qualification audits | Select only for cost-sensitive non-automotive designs; avoid where Grade 1 temperature or ESD compliance is mandatory |
Compared with SN74LV139AQPWRQ1 and MC74VHC139DT, the SN74AHC139QWBQBRQ1 uniquely combines AEC-Q100 Grade 1 operation, 10.5ns speed at 5V, and wettable-flank packaging - making it the only option qualified for timing-critical powertrain and ADAS subsystems requiring full automotive traceability.
Availability
SN74AHC139QWBQBRQ1 is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, electric powertrain inverters, and body control modules requiring stable component supply across extended product lifecycles.
Supply support for SN74AHC139QWBQBRQ1 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 experience.
The SN74AHC139QWBQBRQ1 belongs to TI's AEC-Q100-qualified 74AHC logic family, designed specifically for high-reliability automotive signal routing, memory decoding, and interface expansion where timing precision and environmental robustness are critical.
FAQ
What automotive qualification level does the SN74AHC139QWBQBRQ1 meet?
The SN74AHC139QWBQBRQ1 is AEC-Q100 qualified for Grade 1 automotive applications, supporting continuous operation from −40°C to +125°C ambient temperature. It also meets HBM Class 2 (±2000V) and CDM Class C4B (±1000V) ESD requirements, and its latch-up immunity exceeds 250mA per JESD17 - fulfilling critical reliability mandates for powertrain and ADAS systems.
Can the SN74AHC139QWBQBRQ1 operate at 2.5V supply voltage?
Yes, the SN74AHC139QWBQBRQ1 supports VCC from 2V to 5.5V, including 2.5V operation. At 2.5V, its typical VOL is 0.2V at 2mA sink current and VOH is 2.3V at 2mA source current, with propagation delay increasing to ~16.5ns (max) at CL = 50pF - verified in the Electrical Characteristics table of the official datasheet SCLSA05.
Does the SN74AHC139QWBQBRQ1 support demultiplexing functionality?
Yes, the SN74AHC139QWBQBRQ1 supports demultiplexing: apply data to the active-low strobe input (G) and use A0/A1 to select which output (Y0–Y3) receives the inverted data. When G = LOW, the selected Yx output mirrors the inverse of G (i.e., HIGH), while all others remain HIGH; this enables 1:4 data distribution without additional logic gates.
What is the purpose of the thermal pad on the SN74AHC139QWBQBRQ1 WQFN package?
The exposed thermal pad on the SN74AHC139QWBQBRQ1 (BQB package) improves heat dissipation and may be connected to GND for enhanced thermal performance and EMI reduction. TI documentation confirms it can be left floating or tied to GND - but never to VCC or signal nets - and is required for achieving the published RθJB of 75.4°C/W in PCB layout design.
Are unused inputs on the SN74AHC139QWBQBRQ1 required to be terminated?
Yes, all unused inputs on the SN74AHC139QWBQBRQ1 must be terminated to either VCC or GND - never left floating - due to its standard CMOS input structure. TI specifies a 10kΩ pull-up or pull-down resistor as acceptable; failure to terminate risks oscillation, excess power draw, and unpredictable output states, especially in automotive temperature ranges.
SN74AHC139QWBQBRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 16-WFQFN Exposed Pad
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 16-WQFN (2.5x3.5)
SN74AHC139QWBQBRQ1 FAQ
1.How can I place an order for SN74AHC139QWBQBRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC139QWBQBRQ1 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 SN74AHC139QWBQBRQ1 reliable?
The price and inventory of SN74AHC139QWBQBRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC139QWBQBRQ1 is usually 5 days.
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SN74AHC139QWBQBRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC139QWBQBRQ1 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 SN74AHC139QWBQBRQ1?
For technical support, including SN74AHC139QWBQBRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC139QWBQBRQ1 requirements.
6.How does Aetrix verify that SN74AHC139QWBQBRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AHC139QWBQBRQ1 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 SN74AHC139QWBQBRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AHC139QWBQBRQ1?
All SN74AHC139QWBQBRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC139QWBQBRQ1, 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 SN74AHC139QWBQBRQ1 part is unused and in its original packaging.
Return procedure for SN74AHC139QWBQBRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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