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NXP Semiconductors MC33298DW
- Part No.:
- MC33298DW
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC33298DW.pdf
- Description:
- IC PWR SWITCH N-CHAN 1:8 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,710
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Product details
Overview
MC33298DW from Freescale Semiconductor is an eight-channel low-side power switch IC with SPI serial interface, designed for automotive load control. It features 0.4Ω RDS(ON) @ 25°C, 3.0A transient sink capability per channel, 5.5–26.5V wide VPWR supply range, and integrated over-current, over-temperature, and open-load fault reporting via SO pin - used in body control modules for solenoid, relay, and lamp driving.
For engineers reviewing the MC33298DW datasheet, MC33298DW pinout, MC33298DW application, or MC33298DW equivalent, this page delivers verified electrical specs, SPI timing constraints up to 8.5 MHz, thermal derating guidance for multi-output operation, and real-world fault detection behavior including SFPD-controlled current-limit vs. latch-off modes.
Technical Context
The MC33298DW implements an 8-bit serial-in/parallel-out shift register driving independent DMOS low-side switches, each with dedicated analog monitoring circuitry for over-current (3.0–6.0A threshold), over-temperature (>155°C shutdown), and open-load detection. Fault status is reported serially via tri-state SO pin during CS high, synchronized to SCLK edges.
It uses SMARTMOS™ mixed-technology integration: CMOS logic for SPI interface and control, bipolar/MOS analog comparators for real-time protection, and updrain DMOS output transistors with 65V clamp voltage. No internal charge pump is required - outputs turn on fully with VGS < 5.0V, enabling direct 5V logic-level drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output count | 8 independent low-side MOSFET switches with open-drain outputs |
| RDS(ON) @ 25°C | 0.4Ω max per channel at VPWR = 13V, enabling ≤0.5A continuous per output on standard PCB |
| VPWR operating range | 5.5–26.5V DC - supports automotive battery transients and wide-input industrial supplies |
| SPI clock rate | Guaranteed 2.0 MHz; functional to 8.5 MHz @ 25°C - enables fast MCU command throughput |
| Fault reporting | Serial SO pin reports over-voltage, over-temperature, short-to-battery, and open-load (OFF state) faults |
| Thermal limit | Junction temperature range −40°C to +150°C; over-temperature shutdown at 155–185°C with 10–20°C hysteresis |
| Supply current | ≤4.0 mA IDD during operation; ≤25 µA IPWR in sleep state - critical for always-on vehicle modules |
Pinout & Package
MC33298DW is housed in a 24-pin SOIC-W (Small Outline Integrated Circuit – Wide) package, optimized for automotive thermal dissipation with multiple GND pins (pins 5–8, 17–20) serving as primary heat-sinking paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OP0–OP7 (pins 24, 23, 14, 13, 12, 11, 2, 1) | Low-side output drains | Each sinks up to 3.0A transient load current; open-drain configuration requires external pull-up for high-side switching |
| VPWR (pin 21) | Main power supply for output stage | Drives DMOS gate bias and handles full load current; rated for 60V transient spikes |
| VDD (pin 16) | Logic supply input | 5.0V ±10% CMOS-compatible supply for SPI interface and internal logic; includes UVLO at 2.0–4.5V |
| CS (pin 10) | Chip select enable | Active-low signal enabling SPI data transfer; rising edge triggers SO fault reporting |
| SCLK (pin 3), SI (pin 4), SO (pin 9) | SPI interface signals | Full-duplex synchronous communication: SI accepts falling-edge clocked commands; SO returns fault status on rising edge |
| RST (pin 22) | Asynchronous reset | Active-low input clearing shift register and forcing all outputs OFF - no SPI transaction required |
| SFPD (pin 15) | Short-fault protect disable | Grounding disables latching OFF during over-current; tying to 5.0V enables current-limit-only mode without shutdown |
| GND (pins 5–8, 17–20) | Power ground / thermal path | Eight dedicated ground pins minimize IR drop and improve thermal resistance (RθJA = 31°C/W all outputs ON) |
Key Features
| Feature | Design Value |
|---|---|
| Wide VPWR supply range | Operates from 5.5V to 26.5V - supports cold-crank (6V) and load-dump (26.5V) automotive conditions without external regulators |
| Integrated output clamping | 65V clamp voltage per output - eliminates need for external flyback diodes when switching inductive loads like solenoids and relays |
| Programmable fault response | SFPD pin selects between latch-off (default) or current-limit-only mode - enables fail-safe operation in safety-critical systems |
| Open-load detection | Detects open circuits only when output is commanded OFF (IOCO = 30–100 µA threshold) - avoids false alarms during normal OFF states |
| Ultra-low sleep current | 25 µA maximum IPWR at VDD = 0.5V - meets automotive "sleep mode" current budgets for body electronics |
Applications
| Automotive Body Control Module | Industrial PLC Output Stage |
|---|---|
|
Use Scenario: Controlling door locks, seat heaters, and interior lighting in modern vehicles using CAN-linked microcontrollers. IC Role / Device Role / Timing Role: Low-side switch translating SPI commands into 8 independent load drives; fault reporting enables diagnostic trouble code (DTC) generation. Use Value: Eliminates discrete driver transistors and protection diodes; reduces BOM count by 12+ components per 8-channel group while supporting ASIL-B functional safety requirements. |
Use Scenario: Driving 24V solenoid valves and indicator lamps in factory automation I/O modules. IC Role / Device Role / Timing Role: SPI-expander replacing parallel GPIO ports; SO pin feeds back real-time fault status to PLC controller for predictive maintenance. Use Value: Enables daisy-chained topology (Figure 14) - one MCU SPI port controls up to 32 loads across four MC33298DW devices, cutting wiring harness complexity. |
| Truck Trailer Lighting Controller | Off-Highway Equipment Power Distribution |
|
Use Scenario: Managing brake lights, turn signals, and ABS actuators on heavy-duty trailers with long cable runs and harsh EMI environments. IC Role / Device Role / Timing Role: Robust low-side driver with 65V clamp and 26.5V VPWR rating - withstands ISO 7637-2 pulse 5a/b transients without failure. Use Value: Built-in open-load detection confirms bulb burnout before driver activation, reducing field service calls by identifying failed lamps pre-illumination. |
Use Scenario: Centralized power switching for hydraulic valve banks and sensor excitation in construction and agricultural machinery. IC Role / Device Role / Timing Role: High-current (3.0A peak) switch with thermal foldback - prevents thermal runaway during extended duty cycles in sealed enclosures. Use Value: RDS(ON) of 0.4Ω minimizes power loss (≤0.6W per channel at 1.2A), reducing heatsink requirements and enabling compact 24-pin SOIC-W packaging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-side power switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33879AEK | 10-channel version with enhanced diagnostics (current sense per channel, PWM support); larger 32-pin SOIC package | Requires higher MCU resource allocation for current monitoring; suited for active load regulation, not just ON/OFF control | Select MC33879AEK when per-channel current feedback or PWM dimming is required; MC33298DW remains optimal for cost-sensitive binary switching. |
| TLE6232GP | 8-channel low-side switch with LIN interface instead of SPI; 0.55Ω RDS(ON); lacks open-load detection in OFF state | LIN bus integration simplifies connection to vehicle body networks but limits data rate to 20 kbps vs. MC33298DW's 8.5 MHz SPI | Choose TLE6232GP for LIN-based architectures where protocol compatibility outweighs speed and diagnostic depth; MC33298DW preferred for SPI-centric designs demanding fast updates and rich fault visibility. |
Compared with MC33879AEK and TLE6232GP, the MC33298DW offers the best balance of SPI speed, comprehensive fault reporting (including OFF-state open-load), and thermal efficiency in a compact 24-pin SOIC-W - making it ideal for high-channel-count automotive body controllers where layout space and diagnostic coverage are constrained.
Availability
MC33298DW is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC output stages, and off-highway equipment power distribution requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC33298DW 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
Freescale Semiconductor (now part of NXP Semiconductors) is a global leader in automotive and industrial analog/mixed-signal ICs, known for robust power management and system basis chips.
The MC33298DW belongs to Freescale's SMARTMOS™ automotive power switch family, engineered specifically for intelligent load control in harsh environments - emphasizing fault resilience, wide supply tolerance, and minimal external component count.
FAQ
What is the maximum continuous current per channel for MC33298DW under typical PCB conditions?
The MC33298DW supports 0.5A continuous current per output when all eight channels are simultaneously ON and mounted on a standard FR-4 PCB with adequate copper pour. This derating accounts for thermal limits - junction temperature must remain ≤150°C. At lower ambient temperatures or with enhanced heatsinking, higher per-channel currents are possible, but total device power dissipation must stay within the 3.0W limit specified at TA = 25°C.
Does MC33298DW support daisy-chaining multiple devices on a single SPI bus?
Yes, the MC33298DW supports daisy-chaining via its SO (serial output) and SI (serial input) pins. When configured in cascade mode, the SO of one MC33298DW connects to the SI of the next, allowing a single MCU SPI interface to control up to 32 outputs using only one CS line - as illustrated in Figure 14 of the MC33298 datasheet Rev. 6.0.
How does the SFPD pin affect over-current protection behavior in MC33298DW?
When SFPD is grounded, the MC33298DW latches OFF individual outputs experiencing over-current (3.0–6.0A). When SFPD is pulled to 5.0V, the same over-current event forces the affected output into current-limit mode without shutdown - maintaining partial functionality. This dual-mode behavior is unique to the MC33298DW and enables flexible safety architecture design.
Can MC33298DW drive incandescent lamps directly, and how does it handle in-rush current?
Yes, the MC33298DW is explicitly designed for incandescent lamp control. Its output current limiting (3.0–6.0A threshold) accommodates cold-filament in-rush currents up to 10× steady-state draw. Combined with 65V output clamping, it suppresses voltage spikes during lamp turn-off without external components - validated per automotive lamp-switching standards.
What is the purpose of the RST pin on MC33298DW, and is it necessary for normal operation?
The RST pin on MC33298DW provides asynchronous hardware reset: pulling it low clears the internal 8-bit shift register and forces all eight outputs OFF immediately, independent of SPI activity. While not required for routine operation, it is essential for safe startup sequencing, brown-out recovery, and fault recovery - ensuring deterministic initial state without MCU software intervention.
MC33298DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Type:
- General Purpose
- Number of Outputs:
- 8
- Ratio - Input:Output:
- 1:8
- Output Configuration:
- Low Side
- Output Type:
- N-Channel
- Interface:
- SPI
- Voltage - Load:
- 9V ~ 26.5V
- Voltage - Supply (Vcc/Vdd):
- 2.5V ~ 4.5V
- Current - Output (Max):
- 1A
- Rds On (Typ):
- 350mOhm
- Input Type:
- -
- Features:
- -
- Fault Protection:
- Current Limiting (Fixed), Open Load Detect, Over Temperature, Over Voltage
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
MC33298DW FAQ
1.How can I place an order for MC33298DW through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33298DW 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 MC33298DW reliable?
The price and inventory of MC33298DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33298DW is usually 5 days.
3.What payment methods are accepted for MC33298DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33298DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33298DW?
MC33298DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33298DW 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 MC33298DW?
For technical support, including MC33298DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33298DW requirements.
6.How does Aetrix verify that MC33298DW is sourced from the original manufacturer or authorized distributors?
All MC33298DW 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 MC33298DW meets industry standards.
7.What is the process for return or replacement of MC33298DW?
All MC33298DW units undergo pre-shipment inspection (PSI). If there is an issue with MC33298DW, 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 MC33298DW part is unused and in its original packaging.
Return procedure for MC33298DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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