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Nexperia USA Inc. 74HCT138D,653
- Part No.:
- 74HCT138D,653
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HCT138D,653.pdf
- Description:
- IC DECODER/DEMUX 1 X 3:8 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,296
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Product details
Overview
74HCT138D,653 from Nexperia is a TTL-level-compatible 3-to-8 line inverting decoder/demultiplexer in SO16 package, featuring three active-LOW enable inputs (E1, E2), one active-HIGH enable input (E3), and eight mutually exclusive active-LOW outputs (Y0–Y7). It operates from 4.5 V to 5.5 V, delivers propagation delays as low as 17 ns (VCC = 4.5 V, CL = 50 pF), and supports industrial temperature range (−40 °C to +125 °C). It is used for memory chip select decoding in microcontroller-based embedded systems.
For engineers reviewing the 74HCT138D,653 datasheet, 74HCT138D,653 pinout, 74HCT138D,653 application, or 74HCT138D,653 equivalent, key selection criteria include TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), guaranteed 8-output mutual exclusivity under triple-enable logic, SO16 thermal performance (Ptot = 500 mW, derates above 110 °C), and demultiplexing capability using E1/E2 as strobes and E3 as data input.
Technical Context
The 74HCT138D,653 implements combinational logic decoding with strict enable hierarchy: only when E1 = LOW, E2 = LOW, and E3 = HIGH are outputs enabled-ensuring deterministic state control. Its inverting output architecture means Y0–Y7 go LOW for selected address combinations (A2:A0), enabling direct drive of active-LOW chip selects without external inverters.
Input clamping diodes allow safe interfacing to voltages exceeding VCC when current-limiting resistors are used. The device complies with JEDEC JESD8C (2.7–3.6 V) and JESD7A (2.0–6.0 V), and meets HBM ESD >2000 V and CDM >1000 V per JS-001/JS-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 5.5 V - Ensures compatibility with 5 V TTL logic families and stable operation across industrial voltage tolerances. |
| Propagation Delay (tpd) | 17 ns (max, An→Yn, VCC = 4.5 V, CL = 50 pF) - Enables reliable decoding in high-speed 5 V digital systems with ≤58 MHz timing margin. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Guarantees robust noise immunity and seamless interface with standard 5 V TTL outputs. |
| Output Drive | VOH ≥ 3.98 V (IO = −4 mA), VOL ≤ 0.26 V (IO = 4 mA) - Supports fan-out of ≥10 74HCT loads while maintaining valid logic levels. |
| Operating Temperature | −40 °C to +125 °C - Qualified for under-hood, industrial control, and extended-range embedded applications without derating. |
| Power Dissipation | Ptot = 500 mW (SO16, ≤110 °C); derates 12.4 mW/K above - Defines maximum continuous power handling in PCB-constrained layouts. |
| Input Capacitance | CI = 3.5 pF - Minimizes loading on driving gates and preserves signal integrity in dense routing environments. |
Pinout & Package
74HCT138D,653 uses the SOT109-1 (SO16) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm lead pitch, gull-wing leads, and surface-mount compatible footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 (A0, A1, A2) | Binary address inputs | Decode 3-bit address into one of eight output lines; CMOS-compatible inputs with TTL-level thresholds. |
| 4, 5 (E1, E2) | Active-LOW enable inputs | Both must be LOW to activate decoding; enables cascading via parallel expansion with minimal external logic. |
| 6 (E3) | Active-HIGH enable input | Must be HIGH to enable outputs; allows use as 8-output demultiplexer when driven by data signal. |
| 7, 9–15 (Y0–Y7) | Active-LOW decoded outputs | Only one output goes LOW per valid address/enable combination; mutually exclusive, inverting behavior. |
| 8 (GND) | Ground reference | 0 V return path for all internal circuitry and output loads; requires low-impedance PCB plane connection. |
| 16 (VCC) | Positive supply | Primary power rail (4.5–5.5 V); decoupling capacitor (100 nF) required within 5 mm of pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-level input compatibility | VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 4.5–5.5 V - Eliminates level-shifting when interfacing with legacy 5 V microcontrollers and peripherals. |
| Triple-enable architecture | E1/E2 (active-LOW) + E3 (active-HIGH) - Provides precise hierarchical control for multi-chip select decoding and avoids spurious outputs during power-up. |
| Demultiplexing mode support | E3 accepts data input while E1/E2 act as strobes - Enables reuse as 1-to-8 data distributor without additional ICs. |
| Industrial temperature qualification | Specified from −40 °C to +125 °C - Validated for operation in automotive engine compartments and industrial PLC backplanes. |
| ESD robustness | HBM >2000 V, CDM >1000 V - Reduces risk of field failure during handling and board assembly in non-ESD-controlled environments. |
Applications
| Memory Address Decoding | Peripheral Chip Select Logic |
|---|---|
Use Scenario: Microcontroller with 16-bit address bus selects among eight SRAM or Flash devices using A15–A13 as address inputs. IC Role / Device Role / Timing Role: 3-to-8 decoder mapping upper address bits to individual /CS lines; ensures only one memory device is active per access cycle. Use Value: Eliminates discrete gate logic, reduces BOM count, and guarantees glitch-free chip enable transitions due to synchronous enable gating. |
Use Scenario: Industrial PLC CPU routes commands to eight I/O expansion modules via shared data bus and dedicated select lines. IC Role / Device Role / Timing Role: Demultiplexer translating module ID bits into individual /SEL signals; E3 driven by frame sync pulse. Use Value: Enables time-multiplexed peripheral addressing with deterministic latency (≤17 ns) and no bus contention. |
| LED Matrix Row Driver Control | Configurable Logic Enable Distribution |
Use Scenario: 8×8 LED matrix controller cycles through rows using A2:A0, with column drivers activated only when corresponding row is selected. IC Role / Device Role / Timing Role: Active-LOW output drives PNP transistor bases or high-side switches for row selection; E1/E2 tied LOW, E3 toggled. Use Value: Provides clean, simultaneous row activation with <100 ns transition time, minimizing ghosting and ensuring uniform brightness. |
Use Scenario: FPGA-based test system activates one of eight calibration circuits based on configuration register bits. IC Role / Device Role / Timing Role: Enable distributor asserting /EN to analog front-end ICs; triple-enable inputs synchronized to system reset and clock domain. Use Value: Prevents partial enable states during configuration changes, avoiding undefined analog bias conditions and measurement errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-to-8 decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC138D,653 | CMOS-level inputs (VIH = 3.15 V min @ VCC = 4.5 V); wider 2.0–6.0 V supply range | Better suited for mixed-voltage systems (e.g., 3.3 V MCU controlling 5 V peripherals) but incompatible with pure TTL sources | Select when interfacing with CMOS or wide-supply controllers; verify input drive strength matches VIH requirement. |
| SN74LS138N | Bipolar TTL technology; VIH = 2.0 V, VIL = 0.8 V; higher ICC (19 mA typical), slower tpd (~25 ns) | Higher power consumption and lower noise immunity; obsolete through-hole only (PDIP16) | Use only for legacy board repairs; avoid for new designs due to obsolescence, thermal limitations, and RoHS non-compliance. |
Compared with 74HC138D,653 and SN74LS138N, the 74HCT138D,653 uniquely balances TTL input compatibility, low-power CMOS efficiency, SO16 surface-mount reliability, and full industrial temperature support-making it optimal for modern 5 V embedded control where interoperability and longevity are critical.
Availability
74HCT138D,653 is available at Aetrix Electronics and suitable for memory decoding, peripheral selection, LED matrix control, and configurable logic enable distribution requiring stable component supply across automotive, industrial, and IoT product lifecycles.
Supply support for 74HCT138D,653 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, reliable logic, analog, and MOSFET solutions with focus on efficiency, miniaturization, and sustainability.
The 74HCT138D,653 belongs to Nexperia's industry-standard 74HCT logic family, designed specifically for seamless 5 V TTL-to-CMOS interfacing in resource-constrained embedded systems where power, size, and long-term supply stability are essential.
FAQ
Can 74HCT138D,653 operate at 3.3 V supply?
No. The 74HCT138D,653 is specified only for 4.5 V to 5.5 V operation per its recommended conditions table. At 3.3 V, input thresholds (VIH/VIL) and output drive (VOH/VOL) fall outside guaranteed limits, risking misdecoding or excessive static current. Use 74HC138D,653 for 3.3 V systems instead.
What is the maximum fan-out when driving 74HCT inputs?
At VCC = 4.5 V, the 74HCT138D,653 can source up to 4 mA (VOH ≥ 3.98 V) and sink up to 4 mA (VOL ≤ 0.26 V). Since each 74HCT input draws ≤1 μA in steady state and ±1 mA during switching, the practical fan-out is ≥10 loads without timing degradation, assuming proper PCB layout and decoupling.
How does the triple-enable logic prevent glitches during power-up?
During power ramp, E1 and E2 default to HIGH (via pull-ups or floating), and E3 defaults to LOW-ensuring all outputs remain HIGH (inactive). Only after VCC stabilizes and control logic asserts E1=E2=LOW and E3=HIGH do outputs become active, eliminating false selections before system initialization completes.
Is thermal pad soldering required for SO16 package?
No. The SOT109-1 (SO16) package has no exposed thermal pad. Thermal dissipation relies on copper pour under pins 8 (GND) and 16 (VCC) and standard PCB trace width design. For >250 mW continuous operation, a minimum 250 mm² 1-oz copper area connected to GND/VCC is recommended per JEDEC standards.
74HCT138D,653 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 3:8
- Independent Circuits:
- 1
- 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-SO
74HCT138D,653 FAQ
1.How can I place an order for 74HCT138D,653 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT138D,653 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 74HCT138D,653 reliable?
The price and inventory of 74HCT138D,653 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT138D,653 is usually 5 days.
3.What payment methods are accepted for 74HCT138D,653?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT138D,653 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT138D,653?
74HCT138D,653 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT138D,653 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 74HCT138D,653?
For technical support, including 74HCT138D,653 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT138D,653 requirements.
6.How does Aetrix verify that 74HCT138D,653 is sourced from the original manufacturer or authorized distributors?
All 74HCT138D,653 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 74HCT138D,653 meets industry standards.
7.What is the process for return or replacement of 74HCT138D,653?
All 74HCT138D,653 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT138D,653, 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 74HCT138D,653 part is unused and in its original packaging.
Return procedure for 74HCT138D,653:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT138D,653 Tags
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SN74HC138DR
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TC7SB3157CFU,LF(CT
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74CBTLV3257PW,118
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74HC154BQ,118
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P3S0200GMX
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SN74CB3Q3245PWR
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TCA9546APWR
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SN74HC138N
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