TEC HD74LS138P Double Panel Mount Populated Pcb Ics Capacitors

( Brand: Tec ), ( Manufacturer Part Number: HD74LS138P ), ( Part Type: Panel Mount ), ( Pcb Type: Double-sided Pcb ), ( Number Of Rows: 12 ), ( Operating Voltage: 250v ), ( Material: Fr-4, Copper )

Review TEC Double sided Panel Mount Populated Pcb Ics And Capacitors

The **HD74LS138P Double-Sided Panel-Mount Populated PCB with Integrated ICs and Capacitors** is a meticulously assembled, high-performance logic decoder module designed for precision control and signal routing in digital circuit applications. This pre-populated printed circuit board (PCB) features the **74LS138**, a classic 3-to-8 line decoder/demultiplexer from the TTL (Transistor-Transistor Logic) family, housed in a compact **DIP-16 package** and securely mounted on a double-sided PCB for enhanced reliability and ease of integration. The board is engineered with a **panel-mount design**, allowing for straightforward installation into enclosures, prototyping setups, or custom chassis builds, while its double-sided layout ensures optimized signal integrity and reduced electromagnetic interference. To further stabilize operation and filter noise, the PCB incorporates strategically placed **through-hole capacitors** (such as 0.1 F or 10 F ceramic or electrolytic types, depending on the specific design), which help smooth voltage fluctuations, suppress transients, and improve overall circuit stability critical for applications requiring clean, consistent logic levels.

The **HD74LS138P** itself is a versatile component, capable of decoding three active-low input lines (G1, G2, G2 ) into one of eight active-low outputs (Y0 Y7), making it ideal for address decoding, multiplexing, or control logic in microcontroller interfaces, memory expansion systems, or custom digital circuits. The board s double-sided construction not only maximizes component density but also facilitates better heat dissipation and signal routing, reducing the risk of signal degradation over long traces. Whether used in educational projects, retro computing restorations, or industrial control systems, this pre-populated module offers a convenient, ready-to-use solution that eliminates the need for tedious soldering and component selection, allowing engineers and hobbyists to focus on system integration and functionality. Its robust construction and compatibility with standard TTL voltage levels (5V) ensure seamless compatibility with a wide range of digital logic circuits, making it a reliable choice for both novice and experienced designers.

**Pros and Cons of Buying a Pre-Populated PCB (HD74LS138P with Double-Sided Panel Mount, Including Capacitors)**

### **Pros**

1. **Time Efficiency** A fully populated PCB eliminates the need for sourcing, soldering, and testing individual components (e.g., the HD74LS138 decoder/demultiplexer, capacitors, resistors, or other passive elements). This significantly reduces assembly time, especially for small-scale or one-off projects.

2. **Reliability and Consistency** Pre-populated PCBs are manufactured under controlled conditions, ensuring proper soldering, component placement, and electrical continuity. This reduces the risk of human error, such as misaligned pins, cold solder joints, or incorrect component values.

3. **Pre-Tested and Functional** Reputable sellers often provide tested units, meaning the HD74LS138P (or similar IC) and associated components (e.g., capacitors) are verified for basic functionality before shipping. This can save troubleshooting time during prototyping.

4. **Convenience for Non-Experienced Builders** For hobbyists or engineers without advanced soldering skills, a pre-populated PCB simplifies the process of integrating a circuit into a project. No need to handle delicate components like the HD74LS138P (which has fine-pitch pins) or small capacitors.

5. **Space-Saving Design** Double-sided panel-mount PCBs are often designed for compact installations, which can be advantageous for embedded systems, enclosures, or space-constrained applications. The inclusion of capacitors on-board may also reduce external wiring clutter.

6. **Cost Savings for Small Quantities** While bulk purchasing components and assembling them yourself might be cheaper for large orders, pre-populated PCBs can be cost-effective for small quantities (e.g., 1 10 units). The labor savings may outweigh the premium price.

7. **Documentation and Support** Legitimate sellers typically provide schematics, datasheets, or usage guides, which can be invaluable for understanding how the HD74LS138P and capacitors are integrated into the circuit. This reduces the need for reverse-engineering.

8. **Reduced Risk of Component Shortages** If the HD74LS138P or specific capacitors are hard to source (e.g., due to obsolescence or supply chain issues), a pre-populated PCB ensures you have a working unit without delays.

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### **Cons**

1. **Higher Upfront Cost** Pre-populated PCBs are generally more expensive than buying individual components and assembling them yourself. The cost includes labor, testing, and overhead from the seller, which can be prohibitive for large-scale projects.

2. **Limited Customization** The PCB layout and component values (e.g., capacitor sizes) are fixed. If you need modifications (e.g., different capacitor values for filtering or timing), you ll have to source a custom PCB or modify the existing one, which may void warranties or require additional work.

3. **Potential for Counterfeit or Low-Quality Units** Buying from untrusted sellers (especially on unregulated platforms) risks receiving counterfeit ICs (e.g., a fake HD74LS138P) or poorly manufactured PCBs with intermittent issues. Always verify the seller s reputation and request test reports if possible.

4. **No Learning Opportunity** Assembling a PCB from scratch teaches valuable skills in soldering, component handling, and troubleshooting. Pre-populated units skip this learning curve, which may be a drawback for educational or skill-building purposes.

5. **Lead Times and Availability** Pre-populated PCBs may have longer lead times than individual components, depending on the seller s inventory and production capacity. Some specialized ICs (e.g., older 74LS series) or capacitors might be harder to find pre-populated compared to bulk components.

6. **Potential for Hidden Issues** Even if the PCB is tested, long-term reliability can vary. Issues like weak solder joints, component degradation over time, or design flaws (e.g., poor grounding) might not be immediately apparent. Testing the unit in your application is still necessary.

7. **Dependency on Seller s Quality Control** If the seller cuts corners (e.g., using substandard capacitors or improper soldering), the PCB may fail prematurely. This risk is mitigated by purchasing from well-reviewed suppliers with clear quality assurances.

8. **No Flexibility for Repairs or Upgrades** If the HD74LS138P or a capacitor fails, replacing it on a pre-populated PCB can be challenging due to soldering constraints or lack of access. In contrast, a through-hole or easily accessible PCB allows for easier repairs.

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### **Conclusion and Recommendation**

Buying a pre-populated PCB with an HD74LS138P and capacitors is a **practical choice for convenience, reliability, and time savings**, particularly for hobbyists, small-scale projects, or applications where assembly expertise is limited. It is ideal when:

- You need a quick solution without sourcing components.

- You lack the skills or tools for precise soldering (e.g., working with fine-pitch ICs or SMD capacitors).

- You prioritize tested, functional units over customization.

- The project is low-volume, and the cost premium is justified by efficiency.

However, if you are working on a **large-scale project, budget-conscious build, or require customization**, purchasing individual components and assembling them yourself is often more cost-effective and flexible. This approach also provides hands-on experience and greater control over quality.

- **For small projects, prototyping, or non-experts:** Purchase the pre-populated PCB from a reputable seller (e.g., with verified reviews and test reports) to save time and ensure reliability.

- **For large-scale or custom projects:** Buy individual components (HD74LS138P, capacitors, etc.) and assemble them on a PCB of your choice to optimize cost and flexibility.

- **Always verify the seller s credibility** to avoid counterfeit or low-quality units, especially for critical applications. Request datasheets, test results, or return policies if possible.

Details:

TEC Double-Sided Panel Mount Populated PCB with ICs and Capacitors.

part #: hd74ls138p price

• $40.00

specifications pcbemdev:

• brand: Tec
• mpn: Hd74ls138p
• part type: Panel Mount
• pcb type: Double-sided Pcb
• number of rows: 12
• operating voltage: 250v
• material: Fr-4, Copper

offer pcbemdev:

• quantity: 1
• availability: In Stock
• sold: 0
• options: Ship-to-home
• started: April 21, 2026
• best offers: True

payments pcbemdev:

• wallet: Apple-pay
• other
• credit card: Diners-club

general pcbemdev:

• condition: Used
• Electronic Components Semiconductors > Circuit Boards Prototyping > Printed Circuit Boards PCBs

seller pcbemdev:

• # reviews: 1
• rating: 0.0%
• city: Ridgely, Tennessee

shipping pcbemdev:

• service: USPS Ground Advantage
• carrier: USPS
• type: Calculated
• transit: 3-9 Days
• class: Standard
• cost: $5.20

returns pcbemdev:

• policy: No Returns

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