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Texas Instruments SN74HCS139QDRQ1
- Part No.:
- SN74HCS139QDRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74HCS139QDRQ1.pdf
- Description:
- AUTOMOTIVE DUAL 2-LINE TO 4-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:2,498
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Product details
Overview
SN74HCS139QDRQ1 from Texas Instruments is an 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 operation in body control modules and infotainment interfaces.
For engineers reviewing the SN74HCS139QDRQ1 datasheet, SN74HCS139QDRQ1 pinout, SN74HCS139QDRQ1 application, or SN74HCS139QDRQ1 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification (–40°C to +125°C), hysteresis-enabled noise immunity, dual independent enable-controlled decoding channels, and SOIC-16 package compatibility with legacy automotive PCB layouts.
Technical Context
The SN74HCS139QDRQ1 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 (A1, A0) to assert exactly one low-level output (Y0–Y3) when enabled - all others remain high.
Schmitt-trigger inputs provide 0.6 V minimum hysteresis at 6 V supply, enabling robust operation with slow-rising signals or noisy environments common in automotive harnesses. Outputs feature balanced push-pull CMOS structure capable of sourcing/sinking up to ±7.8 mA at 6 V while maintaining VOH ≥ 5.4 V and VOL ≤ 0.33 V under 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 automotive subsystems without level-shifting |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for engine bay and dashboard placement |
| Output Drive Strength | ±7.8 mA at 6 V - sufficient to directly drive LED indicators, small MOSFET gates, or multiple CMOS inputs |
| Input Hysteresis (ΔVT) | Min 0.6 V at 6 V - rejects >600 mVpp noise on address/control lines without false triggering |
| Quiescent Supply Current | Typ 100 nA at 6 V - enables always-on functions in battery-sensitive applications like door modules |
| Propagation Delay | Max 14 ns at 6 V - ensures timing compliance in sub-50 MHz address decoding paths |
| ESD Rating | HBM ±4000 V, CDM ±1500 V - meets automotive ESD robustness requirements per AEC-Q100-002/-011 |
Pinout & Package
SN74HCS139QDRQ1 is supplied in a 16-pin SOIC (D) package measuring 9.90 mm × 3.90 mm, with standard 1.27 mm pitch and gull-wing leads compatible with automated SMT assembly and IPC-7351B footprint guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | 1G / 2G | Active-low channel enable - disables all Y outputs to high-impedance-equivalent HIGH state when asserted |
| 2, 14 | 1A0 / 2A0 | LSB address input - selects output Y0/Y1 (low) or Y2/Y3 (high) per channel |
| 3, 13 | 1A1 / 2A1 | MSB address input - completes 2-bit decode to select one of four outputs per channel |
| 4–7, 9–12 | 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs - only one per channel is LOW at any time when enabled; all others HIGH |
| 8 | GND | Ground reference - must be low-impedance connection to minimize switching noise coupling |
| 16 | VCC | Positive supply - requires local 0.1 µF ceramic bypass capacitor placed adjacent to pin |
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 instrument cluster deployment |
| Schmitt-trigger input hysteresis | Guaranteed 0.6 V min ΔVT at 6 V enables reliable decoding of slow-switching sensor signals or long-wire bus transitions |
| Ultra-low static current | 100 nA typical ICC allows integration into always-on vehicle networks without measurable battery drain |
| Balanced push-pull outputs | Symmetric ±7.8 mA drive capability ensures consistent rise/fall times and predictable loading across logic families |
| Dual independent decode channels | Two fully isolated 2:4 decoders share no internal coupling - enables concurrent chip-select generation for separate memory banks |
Applications
| Memory Address Decoding | Multi-Device Bus Control |
|---|---|
Use Scenario: Selecting among four SRAM or Flash devices sharing a common data/address bus in an ADAS domain controller. IC Role / Device Role / Timing Role: Dual-channel decoder generates four independent chip-select (CS) signals, each activated by unique 2-bit address combinations. Use Value: Reduces microcontroller GPIO count by 4 pins versus discrete enable lines, while maintaining deterministic access timing via <14 ns propagation delay. | Use Scenario: Managing power sequencing and status reporting across four HVAC actuators using shared I²C or SPI bus lines. IC Role / Device Role / Timing Role: Enables individual actuator addressing through decoded enable pulses synchronized to master clock edges. Use Value: Eliminates need for dedicated MCU output per actuator, preserving firmware resources and simplifying layout routing in tight dash-space constraints. |
| LED Indicator Multiplexing | Automotive Sensor Interface |
Use Scenario: Driving eight discrete status LEDs (e.g., door open, seatbelt, ABS, ESC) from a 4-pin MCU port in a body control module. IC Role / Device Role / Timing Role: Two decoders route single 2-bit pattern to eight LED cathodes via active-low outputs, with current limiting resistors on each Y line. Use Value: Achieves 1:4 signal expansion with <0.33 V VOL at 7.8 mA - ensures full LED brightness without external drivers or voltage translation. | Use Scenario: Conditioning and routing analog sensor outputs (e.g., cabin temperature, humidity) to ADC inputs in infotainment head units. IC Role / Device Role / Timing Role: Schmitt-trigger inputs clean slow-ramping thermistor or capacitive sensor voltages before routing to multiplexer or ADC reference switches. Use Value: 0.6 V hysteresis prevents chatter during thermal drift near threshold crossings, improving measurement stability without software debouncing. |
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 |
|---|---|---|---|
| SN74HCS139QPWRQ1 | TSSOP-16 package (5.00 mm × 4.40 mm); identical electrical specs and AEC-Q100 qualification | Smaller footprint and lower profile - preferred for space-constrained modules like rearview camera ECUs | Select when board area or Z-height is constrained; requires rework of land pattern and stencil design |
| MC74HC139ADTR2G | Non-automotive grade (industrial temp: –55°C to +125°C); same pinout but lacks AEC-Q100 documentation and CDM ESD certification | Not approved for safety-critical automotive systems; suitable only for aftermarket or non-OEM designs | Use only in cost-sensitive, non-safety applications where full automotive qualification is not mandated |
Compared with SN74HCS139QDRQ1, the TSSOP variant offers identical functionality in a smaller package for density-optimized layouts, while the MC74HC139ADTR2G provides pin-compatible industrial-grade performance without automotive validation - requiring careful risk assessment for OEM deployment.
Availability
SN74HCS139QDRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, infotainment system interfaces, and ADAS sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HCS139QDRQ1 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 ICs, with decades of experience delivering high-reliability components for mission-critical systems.
The SN74HCS139QDRQ1 belongs to TI's HCS logic family - designed specifically for automotive applications demanding low power, noise immunity, and AEC-Q100 compliance in harsh electrical environments.
FAQ
What is the maximum output current rating for SN74HCS139QDRQ1?
The SN74HCS139QDRQ1 supports ±7.8 mA output current per channel at 6 V supply, verified under recommended operating conditions. This value represents the maximum sustainable sink/source capability while maintaining VOL ≤ 0.33 V and VOH ≥ 5.4 V. Exceeding this current risks violating absolute maximum ratings for IO (±35 mA) and may cause thermal stress or timing degradation in the SN74HCS139QDRQ1.
Does SN74HCS139QDRQ1 require external pull-up resistors on its outputs?
No, SN74HCS139QDRQ1 does not require external pull-up resistors because it features true push-pull CMOS outputs that actively drive both HIGH and LOW states. Its outputs can source up to 7.8 mA and sink up to 7.8 mA, eliminating the need for passive pull-ups. However, unused inputs must be terminated to VCC or GND - a requirement explicitly defined in the SN74HCS139QDRQ1 datasheet to prevent floating node instability.
Can SN74HCS139QDRQ1 operate reliably with a 3.3 V supply in automotive applications?
Yes, SN74HCS139QDRQ1 operates reliably from 2 V to 6 V, including 3.3 V nominal supplies commonly used in automotive infotainment and telematics modules. At 3.3 V, it delivers ±6 mA output drive, maintains >0.4 V hysteresis, and retains full AEC-Q100 Grade 1 qualification across –40°C to +125°C. All electrical characteristics in the SN74HCS139QDRQ1 datasheet are specified over this full voltage range.
How does the Schmitt-trigger input architecture benefit SN74HCS139QDRQ1 in automotive environments?
The Schmitt-trigger inputs in SN74HCS139QDRQ1 provide built-in hysteresis (min 0.6 V at 6 V), enabling robust operation with slow-rising signals and noise immunity against electromagnetic interference common in vehicle harnesses. This eliminates false triggering from crosstalk or ground bounce, allowing direct connection to unconditioned sensor outputs or long PCB traces without external RC filtering - a key reliability feature confirmed in the SN74HCS139QDRQ1 functional test reports.
Is SN74HCS139QDRQ1 pin-compatible with legacy 74HC139 devices?
SN74HCS139QDRQ1 is functionally and pin-compatible with industry-standard 74HC139 decoders, including identical pinout, logic behavior, and DC/AC specifications. 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. The SN74HCS139QDRQ1 maintains backward compatibility while enhancing noise immunity and power efficiency over legacy HC variants.
SN74HCS139QDRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCS
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74HCS139QDRQ1 FAQ
1.How can I place an order for SN74HCS139QDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCS139QDRQ1 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 SN74HCS139QDRQ1 reliable?
The price and inventory of SN74HCS139QDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCS139QDRQ1 is usually 5 days.
3.What payment methods are accepted for SN74HCS139QDRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCS139QDRQ1 transactions.
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4.How is shipping managed for SN74HCS139QDRQ1?
SN74HCS139QDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCS139QDRQ1 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 SN74HCS139QDRQ1?
For technical support, including SN74HCS139QDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCS139QDRQ1 requirements.
6.How does Aetrix verify that SN74HCS139QDRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74HCS139QDRQ1 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 SN74HCS139QDRQ1 meets industry standards.
7.What is the process for return or replacement of SN74HCS139QDRQ1?
All SN74HCS139QDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCS139QDRQ1, 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 SN74HCS139QDRQ1 part is unused and in its original packaging.
Return procedure for SN74HCS139QDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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