CSD17556Q5B

Texas Instruments CSD17556Q5B NexFET 30-V N‑Channel Power MOSFET (SON 5×6 Q5B)

The Texas Instruments CSD17556Q5B is a single 30-V N‑channel power MOSFET built on TI’s NexFET technology and delivered in a compact 5 mm × 6 mm SON (Q5B) package. Purpose-built for high-efficiency switching, it is a strong fit for synchronous buck converters, DC‑DC power stages, and general-purpose switching roles across computing, industrial, and embedded power designs. If you need a mainstream 30‑V MOSFET in a robust, surface‑mount footprint with a smooth design-in path, the CSD17556Q5B is an excellent candidate.

Quick Specifications and Highlights

• Brand/Manufacturer: Texas Instruments
• Series/Technology: NexFET
• MPN: CSD17556Q5B
• Category: Discrete Semiconductors – MOSFETs (Single)
• MOSFET Type: N‑Channel
• Channel Configuration: Single
• Drain‑to‑Source Voltage (Vds): 30 V
• Package / Case: SON 8 (5×6 mm) – Q5B
• Mounting Type: Surface Mount
• Pin Count: 8
• Packaging: Not specified here (confirm reel/tray format per supplier)

Note: Detailed electrical characteristics such as Rds(on), continuous drain current, gate charge, and switching times are not provided in this summary. Refer to the official TI datasheet for the latest electrical and thermal specifications.

Where the CSD17556Q5B Fits

Synchronous buck converters

The CSD17556Q5B targets high-efficiency synchronous buck stages common in point-of-load supplies, server and storage power rails, and embedded regulators. In these topologies, a 30‑V rating covers a wide range of 5–12 V input systems with comfortable margin, while the SON 5×6 mm package helps keep conduction and switching paths short for lower parasitics.

DC‑DC power stages

Designers can deploy this device as a high‑side or low‑side switch in multi-phase or single-phase converters. Its NexFET process is optimized for efficiency-centric designs, making it a practical option when you need to balance thermal performance, footprint, and cost in dense power stages.

General‑purpose switching

Beyond converters, the Texas Instruments CSD17556Q5B supports a variety of switching tasks: load switching, power ORing (with proper topology), and as an element in protection or hot-swap circuits. The 30‑V rating provides flexibility in systems that must interface with common bus voltages and transient conditions, as long as surge and SOA limits are respected per the datasheet.

Why Engineers Choose the CSD17556Q5B

• NexFET credibility: TI’s NexFET portfolio is widely used in performance-sensitive power designs. While exact figures must come from the datasheet, the family is known for low conduction and switching losses.
• Practical 30‑V rating: A sweet spot for 5–12 V rails, motor control auxiliaries, and battery-powered subsystems where margin against transient spikes is desirable.
• Space-efficient Q5B package: The SON 5×6 mm footprint provides a low-profile solution with short electrical paths—helpful for minimizing parasitic inductance and improving thermal spreading through the PCB.
• Single N-channel simplicity: Straightforward drop-in for designs that need a compact, discrete MOSFET without the complexity of integrated drivers.

Electrical Overview (What’s Specified Here)

From the supplied data:

• Device type: Single N‑channel power MOSFET
• Technology: NexFET
• Vds rating: 30 V
• Package: SON 8 (5×6 mm) – Q5B

Other electrical parameters such as Rds(on), maximum continuous drain current, pulsed current, gate threshold, gate charge, body diode characteristics, safe operating area, and thermal resistances are not specified here. For design decisions, please consult the TI CSD17556Q5B datasheet for current, resistance, timing, and derating curves before final selection.

Package, Footprint, and Layout Notes

• Package: SON 8 (5×6 mm), TI code Q5B
• Mounting: Surface‑mount, reflow compatible
• Pin count: 8

Layout guidance (general, not device-specific):

• Keep the loop area between the MOSFET, inductor (if used in a buck stage), and input capacitors as small as possible to reduce switching ringing and EMI.
• Use wide copper pours for drain and source to reduce conduction losses and spread heat into the PCB. Thermal performance is heavily influenced by copper area and layer stack-up.
• Decouple close to the switching node with appropriate high-frequency capacitors to minimize voltage spikes and ringing.
• If the package includes an exposed thermal pad (common for SON types), follow TI’s land pattern and via recommendations in the datasheet to optimize thermal dissipation. Confirm the exact pad and via pattern in the CSD17556Q5B documentation.
• Observe creepage and clearance for the voltage domain in which the MOSFET operates.

Handling and assembly:

• Moisture Sensitivity Level (MSL): Not specified here. Verify on the datasheet or product page and follow storage and baking requirements as needed.
• Packaging format (reel, cut tape, or tray): Not specified here. Confirm with your distributor or TI ordering information for the CSD17556Q5B.

Design‑In Considerations

• Gate drive selection: Choose a gate driver and Vgs range per the datasheet’s absolute maximum ratings and recommended operating conditions. Appropriate drive strength and rise/fall control help manage switching losses and ringing.
• Efficiency balancing: In synchronous buck roles, total loss is the sum of conduction and switching losses. Match the MOSFET (Rds(on), Qg, output charge) to switching frequency, inductor value, and current ripple targets to meet thermal and efficiency goals. Obtain exact values from the CSD17556Q5B datasheet before finalizing the design.
• Thermal modeling: Use the datasheet’s thermal impedance (theta) metrics and any transient thermal impedance curves to estimate junction temperature under worst-case load, ambient, and airflow conditions. PCB copper area, thermal vias, and layer count matter significantly with SON packages.
• Protection and margins: Validate SOA under fault scenarios, including start-up, short-circuit, and inductive switching transients. Confirm voltage derating to keep the device within its 30‑V limit including spikes, ringing, and line/load transients.
• EMI control: Snubbers, gate resistors, and careful placement of input capacitors can mitigate overshoot and radiated emissions. Characterize on the bench with appropriate probes to avoid misreading high-speed waveforms.

Applications in Focus

• Synchronous buck converters powering digital ICs, FPGAs, and ASIC rails
• Multi-phase or single-phase DC‑DC stages in embedded systems
• General-purpose high-side or low-side switching in industrial controls
• Load switching and power path management in distributed power architectures

Each application benefits from the CSD17556Q5B’s compact package and 30‑V rating. While the detailed performance metrics must be taken from TI’s datasheet, the NexFET heritage positions this device for efficient, reliable operation when correctly driven and adequately cooled.

Lifecycle, Availability, and Replacements

• Lifecycle status: Not specified here. Consult the Texas Instruments product page for the latest lifecycle information.
• Inventory/availability: Not specified here. Check TI or authorized distributors for current stock and lead times.
• Replacements and official alternates: Not specified here. TI’s product page may suggest compatible or next-generation devices within the NexFET portfolio. If your design requires a drop‑in footprint with the Q5B package, filter TI’s MOSFET selection by voltage, package, and Rds(on) to identify candidates.

Procurement tips:

• Verify orderable part numbers and packaging options (e.g., tape-and-reel codes) on the product page before placing volume orders.
• Align your AVL with TI’s recommended sources to maintain supply chain resilience.
• Lock in second-source strategies early if your qualification process permits alternates; ensure they match both electrical and mechanical constraints.

Environmental and Regulatory Compliance

• RoHS/REACH/Green: Not specified here. Refer to TI’s compliance documents linked from the CSD17556Q5B product page for up-to-date information.
• Halogen/lead status: Not specified here. Confirm on the datasheet or compliance certificate.

For organizations with strict environmental reporting, archive the specific TI compliance PDF associated with your exact orderable code to ensure traceability during audits.

Selection Checklist (Engineer’s Quick Guide)

When evaluating the Texas Instruments CSD17556Q5B for a new design, walk through this checklist with the TI datasheet open:

• Voltage rating: 30 V is adequate for your bus plus transients and ringing margins.
• Conduction loss: Confirm Rds(on) at your planned gate drive and junction temperature.
• Switching loss: Check total gate charge (Qg), output charge (Qoss), and rise/fall times at your switching frequency.
• Thermal: Calculate junction temperatures using expected power dissipation and thermal impedances; validate with PCB copper area assumptions.
• SOA and stress: Verify safe operating area for overload scenarios, start‑up, and any inductive energy events.
• Body diode: Evaluate diode performance for synchronous rectification or freewheeling duty as applicable.
• Package fit: Ensure the SON 5×6 (Q5B) land pattern and height fit your mechanical envelope; confirm assembly and reflow profiles.
• Compliance: Capture RoHS/REACH status and MSL handling in your design documentation.

For Buyers and Sourcing Managers

• Part identity: Texas Instruments CSD17556Q5B, a single 30‑V N‑channel NexFET MOSFET in SON 8 (5×6 mm) Q5B.
• Use cases: Common in synchronous buck and DC‑DC stages; also suitable for general-purpose switching.
• Package: Space‑efficient, surface‑mount package designed for automated assembly.
• Documentation: TI provides a comprehensive datasheet and product page—use these as the authoritative source for electrical specifications, orderable part numbers, and packaging details.
• Risk mitigation: Consider stocking a small safety buffer for critical builds and monitoring TI’s lifecycle notifications. If alternates are required, align internal qualification with parts in the same voltage class and package footprint.

Resources

• Datasheet: https://www.ti.com/lit/ds/symlink/csd17556q5b.pdf
• Product Page: https://www.ti.com/product/CSD17556Q5B

These links provide official, up-to-date specifications, application guidance, and compliance information for the CSD17556Q5B.

Frequently Asked Questions (FAQs)

Q: What is the Texas Instruments CSD17556Q5B?
A: It is a single 30‑V N‑channel NexFET power MOSFET in a compact SON 8 (5×6 mm) Q5B package, intended for high‑efficiency switching applications.

Q: What applications is it suited for?
A: Synchronous buck converters, DC‑DC power stages, and general-purpose switching, as indicated in the provided product data.

Q: What is the package and pin count?
A: SON 8 (5×6 mm) – Q5B with 8 pins, surface mount.

Q: Is it a logic‑level MOSFET and what is the recommended gate drive voltage?
A: Not specified here. Consult the TI datasheet for gate threshold, recommended drive levels, and absolute maximum ratings for Vgs.

Q: What are the key electrical parameters like Rds(on) and maximum continuous drain current?
A: Not specified here. Refer to the TI datasheet for full electrical characteristics and derating information.

Q: Is the CSD17556Q5B RoHS compliant?
A: Compliance status is not specified here. Check the TI product page and associated compliance documents for the latest information.

Q: What is the lifecycle status of this part?
A: Not specified here. See the Texas Instruments product page for current lifecycle and any notices.

Summary

The Texas Instruments CSD17556Q5B combines a practical 30‑V rating, single N‑channel configuration, and a compact SON 5×6 mm (Q5B) package to address high‑efficiency switching needs in synchronous buck converters, DC‑DC stages, and general-purpose power switching. While this overview highlights the device’s positioning and fit, final selection should be based on the official TI datasheet, where you’ll find the complete electrical and thermal characteristics required for a robust design. For sourcing, rely on TI’s product page and authorized distributors for lifecycle, availability, and compliance details, ensuring a smooth path from prototype to production with the CSD17556Q5B NexFET MOSFET.