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Nexperia USA Inc. 74HCT139DB,118
- Part No.:
- 74HCT139DB,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT139DB,118.pdf
- Description:
- IC DECODER/DEMUX 1X2:4 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,718
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Product details
Overview
74HCT139DB,118 from Nexperia is a dual 2-to-4 line decoder/demultiplexer with TTL-compatible inputs, active-LOW outputs, and independent enable control per section. It operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, and delivers 16 ns typical propagation delay (nA→nY) at VCC = 4.5 V/CL = 50 pF. It is used in memory address decoding and data routing in industrial microcontroller peripheral interfaces.
For engineers reviewing the 74HCT139DB,118 datasheet, 74HCT139DB,118 pinout, 74HCT139DB,118 application, or 74HCT139DB,118 equivalent, key selection criteria include TTL-level input compatibility, dual independent decoder operation, active-LOW output drive capability, SO16 package thermal derating behavior, and ESD robustness (HBM >2000 V).
Technical Context
The device integrates two fully independent 2-to-4 decoders, each with dedicated address inputs (nA0, nA1), active-LOW enable (nE), and four active-LOW outputs (nY0–nY3). Enable logic forces all outputs HIGH when asserted, enabling demultiplexer mode where nE serves as the data input.
Input clamping diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Static and dynamic parameters are specified across -40 °C to +125 °C, with VOH ≥3.98 V (IO = -4 mA) and VOL ≤0.26 V (IO = 4 mA) at VCC = 4.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HCT - TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) |
| Supply Voltage Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V digital systems and stable operation under rail tolerance |
| Propagation Delay | 16 ns typ (nA→nY), 16 ns typ (nE→nY) at VCC = 4.5 V/CL = 50 pF - Enables reliable timing in 25 MHz address decode paths |
| Output Drive | ±4 mA - Sufficient to directly drive multiple 74HCT inputs or small LED loads via pull-up resistors |
| Operating Temperature | -40 °C to +125 °C - Qualified for extended industrial and under-hood embedded applications |
| ESD Protection | HBM >2000 V, CDM >1000 V - Reduces risk of handling damage during PCB assembly and field service |
| Power Dissipation | 500 mW max (SO16), derates 12.4 mW/K above 110 °C - Supports sustained operation in thermally constrained enclosures |
Pinout & Package
74HCT139DB,118 is housed in a plastic small outline package (SO16, SOT109-1) with 16 leads and 3.9 mm body width. The package meets JEDEC MS-012 and is lead (Pb)-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | 1E, 2E - Active-LOW enable inputs | Each controls one decoder section; HIGH disables all outputs (forces HIGH); enables demux mode when used as data input |
| 2, 3, 13, 14 | 1A0, 1A1, 2A0, 2A1 - Address inputs | Binary-select two of four outputs per decoder; CMOS/TTL-compatible input structure with clamp diodes |
| 4–7, 9–12 | 1Y0–1Y3, 2Y0–2Y3 - Active-LOW decoded outputs | Four mutually exclusive LOW pulses per section; sink current up to 4 mA; require external pull-ups for HIGH-state logic |
| 8 | GND | Reference ground for all I/O and supply terminals; must be low-impedance for noise immunity |
| 16 | VCC | Positive supply terminal; bypass capacitor (100 nF) recommended near pin for transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables simultaneous address decoding for two memory banks or peripheral groups without shared timing constraints |
| TTL-compatible inputs | Accepts standard 5 V TTL logic levels without level-shifting, simplifying integration with legacy controllers and FPGAs |
| Active-LOW outputs | Directly interfaces with common cathode displays, N-channel load switches, and reset-active-low peripherals |
| Input clamp diodes | Permits safe connection to signals up to VCC + 0.5 V using series resistors - eliminates need for external protection diodes |
| Wide temperature range | Validated operation from -40 °C to +125 °C supports deployment in motor drives, power supplies, and outdoor industrial controllers |
Applications
| Memory Address Decoding | Peripheral Select Logic |
|---|---|
|
Use Scenario: Selecting one of four SRAM or EEPROM chips in a microcontroller-based data logger. IC Role / Device Role / Timing Role: Dual decoder maps 2-bit address bus to chip-select lines; each section handles separate memory bank. Use Value: Eliminates need for discrete logic gates; reduces board area and routing complexity while maintaining deterministic 16 ns decode latency. |
Use Scenario: Routing UART, SPI, or GPIO signals to one of four sensor modules on an industrial I/O board. IC Role / Device Role / Timing Role: Acts as demultiplexer: nE pins serve as channel select lines, address inputs route data to selected module. Use Value: Enables single serial bus to serve multiple sensors; avoids bus contention and simplifies firmware state management. |
| LED Segment Driver Control | Reset Signal Distribution |
|
Use Scenario: Driving common-anode 7-segment displays in a multi-digit panel meter with multiplexed refresh. IC Role / Device Role / Timing Role: Generates active-LOW digit enable signals; outputs sink current through display segments via current-limiting resistors. Use Value: Provides precise, glitch-free digit selection synchronized to display controller timing; supports 1 kHz+ multiplex rates. |
Use Scenario: Distributing a master reset signal to four independent subsystems (ADC, DAC, communication IC, watchdog) with individual enable control. IC Role / Device Role / Timing Role: Each decoder section asserts active-LOW reset to one subsystem; enables staggered or conditional reset sequencing. Use Value: Prevents race conditions during power-up; allows selective subsystem reset without affecting others - critical for fault recovery. |
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 |
|---|---|---|---|
| 74HC139DB,118 | CMOS input thresholds (VIH = 3.15 V min at VCC = 4.5 V); higher noise margin but incompatible with TTL drivers | Suitable only in pure CMOS systems; requires level translation when interfacing with 5 V TTL or microcontroller GPIOs | Select when system uses exclusively 74HC/74AHC logic and maximum noise immunity is required |
| SN74LS139DR | Bipolar TTL design; VIH = 2.0 V, VOL = 0.5 V max, ICC = 24 mA typical - higher static power and lower drive strength | Limited to 0 °C to +70 °C; not qualified for industrial temperature range or modern low-power designs | Choose only for legacy board replacements where LS-family timing and loading must be preserved |
Compared with 74HC139DB,118 and SN74LS139DR, the 74HCT139DB,118 uniquely balances TTL input compatibility, industrial temperature support, and low quiescent current (8 μA typ), making it optimal for new 5 V embedded designs requiring interoperability and reliability.
Availability
74HCT139DB,118 is available at Aetrix Electronics and suitable for memory address decoding, peripheral select logic, LED segment driver control, and reset signal distribution requiring stable component supply across industrial temperature ranges.
Supply support for 74HCT139DB,118 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
Nexperia is a global semiconductor expert delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in high-volume applications.
The 74HCT logic family targets 5 V mixed-signal systems needing TTL-compatible interfacing with low power consumption and extended temperature operation - designed specifically for industrial control, instrumentation, and automotive-adjacent electronics.
FAQ
Can 74HCT139DB,118 operate at 3.3 V?
No. The 74HCT139DB,118 is specified only for 4.5 V to 5.5 V supply operation. At 3.3 V, input thresholds fall outside guaranteed switching levels (VIH min = 2.0 V, but VCC = 3.3 V violates recommended operating conditions), and output drive capability degrades significantly. Use 74LVC139 or 74AHC139 for 3.3 V systems.
What is the maximum capacitive load this device can drive reliably?
The device is characterized up to 50 pF load capacitance per output, with propagation delay and transition time specifications guaranteed under those conditions. Driving >50 pF increases delay unpredictably and may cause ringing or undershoot due to limited output slew rate (tt = 7 ns typ). For heavier loads, add a buffer stage or reduce trace length and stubs.
Are the two decoders electrically isolated within the same package?
Yes. The two 2-to-4 decoders share only VCC and GND rails; all inputs (1A0/1A1/1E and 2A0/2A1/2E) and outputs (1Y0–1Y3 and 2Y0–2Y3) are fully independent. No internal coupling exists between sections - enabling asynchronous operation and separate power domain control if VCC/GND are partitioned.
Does this part support hot insertion or live swapping?
No. The 74HCT139DB,118 lacks hot-swap protection circuitry such as power-on reset, Ioff, or powered-off isolation. Applying VCC after signal inputs may forward-bias internal clamp diodes, causing excessive current flow. Always power VCC before applying input signals during system initialization or maintenance.
74HCT139DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 2:4
- Independent Circuits:
- 2
- Current - Output High, Low:
- 4mA, 4mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
74HCT139DB,118 FAQ
1.How can I place an order for 74HCT139DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT139DB,118 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 74HCT139DB,118 reliable?
The price and inventory of 74HCT139DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT139DB,118 is usually 5 days.
3.What payment methods are accepted for 74HCT139DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT139DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT139DB,118?
74HCT139DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT139DB,118 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 74HCT139DB,118?
For technical support, including 74HCT139DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT139DB,118 requirements.
6.How does Aetrix verify that 74HCT139DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT139DB,118 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 74HCT139DB,118 meets industry standards.
7.What is the process for return or replacement of 74HCT139DB,118?
All 74HCT139DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT139DB,118, 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 74HCT139DB,118 part is unused and in its original packaging.
Return procedure for 74HCT139DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT139DB,118 Tags
-
SN74HC138DR
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TC7SB3157CFU,LF(CT
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74CBTLV3257PW,118
Nexperia USA Inc.
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74HC154BQ,118
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P3S0200GMX
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SN74CB3Q3245PWR
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TCA9543APWR
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TCA9546APWR
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SN74HC138N
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