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Toshiba Semiconductor and Storage 74VHC238FT
- Part No.:
- 74VHC238FT
- Manufacturer:
- Toshiba Semiconductor and Storage
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74VHC238FT.pdf
- Description:
- 74VHC CMOS LOGIC IC SERIES 3-TO-
- Quantity:
- Payment:
- Shipping:
Inventory:4,935
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Product details
Overview
74VHC238FT from Toshiba Electronic Devices & Storage Corporation is an advanced high-speed CMOS 3-to-8 line decoder with silicon gate C2MOS technology, operating across 2.0–5.5 V supply, delivering 5.5 ns typical propagation delay at 5 V and supporting automotive-grade temperature range (−40 °C to +125 °C). It features three enable inputs (G1, G2A, G2B) for cascading and memory address decoding in embedded control systems.
For engineers reviewing the 74VHC238FT datasheet, 74VHC238FT pinout, 74VHC238FT application, or 74VHC238FT equivalent, this device serves as a low-power, AEC-Q100 qualified decoder for industrial and automotive logic subsystems requiring precise binary selection, wide voltage tolerance, and robust input protection against supply mismatch.
Technical Context
The 74VHC238FT implements a fully decoded 3-bit binary input (A, B, C) to eight active-high outputs (Y0–Y7), with three independent enable inputs enabling hierarchical addressing and multi-chip select logic. Its dual-enable architecture (G1 active-low, G2A/G2B active-high) allows flexible gating and daisy-chain configuration without external logic.
Designed for mixed-voltage interfacing, it supports 0–5.5 V input voltage regardless of VCC, enabling direct connection between 3.3 V controllers and 5 V peripherals or battery-backed systems. Propagation delays are balanced (tPLH ≈ tPHL), and input hysteresis ensures 28 % VCC noise immunity under all operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 3-to-8 line decoder with three enable inputs (G1, G2A, G2B) |
| Supply Voltage Range | 2.0 V to 5.5 V - enables interoperability across 3.3 V and 5 V logic domains |
| Propagation Delay (A/B/C → Y) | 5.5 ns (typ.) at VCC = 5 V, CL = 50 pF - supports >100 MHz address decode timing |
| Quiescent Supply Current | 4.0 µA (max) at TA = 25 °C - ensures ultra-low static power in always-on subsystems |
| Operating Temperature | −40 °C to +125 °C - qualified per AEC-Q100 Rev. H for automotive under-hood applications |
| Input Voltage Tolerance | 0 V to 5.5 V independent of VCC - eliminates level-shifter requirements in mixed-supply designs |
| Noise Immunity | 28 % VCC minimum (VIH − VIL) - sustains reliable operation in electrically noisy environments |
Pinout & Package
TSSOP16B - 16-pin thin shrink small outline package (4.4 mm × 5.0 mm × 1.2 mm), lead-free and RoHS-compliant, optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (G2A) | Enable input (active-high) | One of two G2 enables; both G2A and G2B must be low for decode activation |
| 2 (Y0) | Output (active-high) | Asserted when A=0, B=0, C=0 and all enables satisfied |
| 3 (Y1) | Output (active-high) | Asserted when A=1, B=0, C=0 and all enables satisfied |
| 4 (Y2) | Output (active-high) | Asserted when A=0, B=1, C=0 and all enables satisfied |
| 5 (Y3) | Output (active-high) | Asserted when A=1, B=1, C=0 and all enables satisfied |
| 6 (Y4) | Output (active-high) | Asserted when A=0, B=0, C=1 and all enables satisfied |
| 7 (Y5) | Output (active-high) | Asserted when A=1, B=0, C=1 and all enables satisfied |
| 8 (Y6) | Output (active-high) | Asserted when A=0, B=1, C=1 and all enables satisfied |
| 9 (Y7) | Output (active-high) | Asserted when A=1, B=1, C=1 and all enables satisfied |
| 10 (G2B) | Enable input (active-high) | Second G2 enable; complements G2A for flexible gating logic |
| 11 (C) | Binary select input | MSB of 3-bit address; determines output group Y4–Y7 vs. Y0–Y3 |
| 12 (B) | Binary select input | Middle bit of 3-bit address; selects even/odd pair within group |
| 13 (A) | Binary select input | LSB of 3-bit address; selects individual output within pair |
| 14 (G1) | Enable input (active-low) | Primary global enable; must be low for any output assertion |
| 15 (VCC) | Positive supply | Power rail for internal logic and output drivers; supports 2.0–5.5 V |
| 16 (GND) | Ground reference | Common return path for all inputs, outputs, and internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Rev. H qualification | Validated for automotive applications including engine control and body electronics |
| Balanced propagation delays (tPLH ≈ tPHL) | Minimizes skew-induced glitches in synchronous decode paths |
| Power-down input protection | Prevents latch-up or damage when inputs are driven while VCC is off or floating |
| Wide voltage compatibility (2.0–5.5 V) | Eliminates need for external level shifters in mixed-voltage microcontroller interfaces |
| Pin- and function-compatible with 74AC/HC/AHC/LV238 | Enables drop-in replacement in legacy designs without layout changes |
Applications
| Automotive Body Control Module | Industrial PLC I/O Expansion |
|---|---|
|
Use Scenario: Selecting among 8 discrete load drivers (e.g., door locks, mirror controls, interior lighting) based on CAN message payload. IC Role / Device Role / Timing Role: Address decoder translating 3-bit command field into dedicated output enable lines. Use Value: Enables deterministic, low-latency actuator selection with <5.5 ns decode delay and AEC-Q100 reliability assurance. |
Use Scenario: Expanding digital output capability of a compact PLC controller to drive 8 solenoid valves in packaging machinery. IC Role / Device Role / Timing Role: Binary-select interface between microcontroller GPIO and high-current driver ICs. Use Value: Provides noise-immune, wide-voltage-range decoding compatible with both 3.3 V MCU and 5 V valve drivers. |
| Medical Infusion Pump Logic | Automotive HVAC Control Panel |
|
Use Scenario: Routing sensor status signals (flow, pressure, occlusion) to dedicated LED indicators or fault latches. IC Role / Device Role / Timing Role: Output multiplexer enabling one-of-eight visual feedback channels via shared MCU pins. Use Value: Delivers guaranteed operation from −40 °C to +125 °C and input protection up to 5.5 V - critical for safety-critical medical subsystems. |
Use Scenario: Decoding rotary encoder position or button matrix scan lines to activate corresponding climate mode LEDs or fan speed relays. IC Role / Device Role / Timing Role: Low-power address selector managing backlight segments and motor driver enables. Use Value: Draws only 4.0 µA quiescent current, extending battery backup runtime during vehicle sleep mode. |
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 |
|---|---|---|---|
| 74HC238PW,118 (Nexperia) | Same TSSOP16 package, but rated only to +85 °C; no AEC-Q100 qualification; slightly higher ICC (20 µA max) | Limited to commercial/industrial use; unsuitable for under-hood automotive deployment | Select when cost sensitivity outweighs extended temperature or automotive compliance requirements |
| SN74LV238APW (Texas Instruments) | Lower VCC range (1.65–5.5 V); 6.5 ns typical tPD at 3.3 V; LV logic family with different noise margin specs | Better suited for 1.8 V/3.3 V-only systems; not recommended for 5 V legacy interfaces | Choose for new low-voltage designs where TI's LV family ecosystem and support tools are preferred |
Compared with 74VHC238FT, the Nexperia 74HC238PW offers cost-effective commercial-grade decoding but lacks automotive qualification and ultra-low ICC, while the TI SN74LV238APW extends low-voltage operation at the expense of 5 V compatibility and noise immunity - making the 74VHC238FT optimal for mixed-supply, high-reliability automotive and industrial control.
Availability
74VHC238FT is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O expansion, and medical infusion pump logic requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for 74VHC238FT 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
Toshiba Electronic Devices & Storage Corporation designs and manufactures high-reliability semiconductor components for automotive, industrial, and consumer applications, with emphasis on quality, longevity, and regulatory compliance.
The 74VHC238FT belongs to Toshiba's VHC-series high-speed CMOS logic family, engineered specifically for noise-tolerant, low-power decoding in harsh-environment embedded systems where voltage flexibility and automotive qualification are mandatory.
FAQ
What is the maximum operating temperature for the 74VHC238FT?
The 74VHC238FT is rated for continuous operation from −40 °C to +125 °C and is AEC-Q100 Rev. H qualified, making it suitable for under-hood automotive applications and industrial environments with elevated thermal stress. This rating is verified across all electrical parameters in the datasheet's operating ranges section.
Does the 74VHC238FT support mixed-voltage interfacing?
Yes, the 74VHC238FT supports true mixed-voltage interfacing: inputs tolerate 0–5.5 V regardless of VCC value (2.0–5.5 V), enabling direct connection between 3.3 V microcontrollers and 5 V peripheral drivers without level shifters. This capability is explicitly confirmed in the "General" section and DC characteristics tables.
Is the 74VHC238FT pin-compatible with standard 74-series 238 decoders?
Yes, the 74VHC238FT is pin- and function-compatible with industry-standard 74AC/HC/AHC/LV238 devices in TSSOP16 packages. The datasheet explicitly states "Pin and function compatible with 74 series(AC/HC/AHC/LV etc.)238 type", confirming drop-in replacement capability without PCB modification.
What is the typical propagation delay of the 74VHC238FT at 5 V supply?
The 74VHC238FT delivers a typical propagation delay of 5.5 ns (A/B/C to Y) at VCC = 5.0 ± 0.5 V, CL = 50 pF, and TA = 25 °C, as specified in Section 12.4 AC Characteristics. This performance matches or exceeds bipolar TTL equivalents while maintaining CMOS power efficiency.
How does the enable logic work on the 74VHC238FT?
The 74VHC238FT uses three enable inputs: G1 (active-low), G2A (active-high), and G2B (active-high). All outputs go low unless G1 = LOW AND G2A = LOW AND G2B = LOW. This triple-enable structure simplifies cascading multiple decoders and implementing hierarchical memory or I/O address decoding, as documented in the Functional Description.
74VHC238FT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Decoder
- Circuit:
- 1 x 3:8
- Independent Circuits:
- 1
- Current - Output High, Low:
- 8mA, 8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOPB
74VHC238FT FAQ
1.How can I place an order for 74VHC238FT through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHC238FT 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 74VHC238FT reliable?
The price and inventory of 74VHC238FT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC238FT is usually 5 days.
3.What payment methods are accepted for 74VHC238FT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC238FT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHC238FT?
74VHC238FT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHC238FT 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 74VHC238FT?
For technical support, including 74VHC238FT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC238FT requirements.
6.How does Aetrix verify that 74VHC238FT is sourced from the original manufacturer or authorized distributors?
All 74VHC238FT 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 74VHC238FT meets industry standards.
7.What is the process for return or replacement of 74VHC238FT?
All 74VHC238FT units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC238FT, 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 74VHC238FT part is unused and in its original packaging.
Return procedure for 74VHC238FT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74VHC238FT Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
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