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NXP Semiconductors MC33291DWR2
- Part No.:
- MC33291DWR2
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC33291DWR2.pdf
- Description:
- IC PWR SWITCH N-CHAN 1:8 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,413
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Product details
Overview
MC33291DWR2 from NXP Semiconductors (formerly Freescale) is an eight-output, low-side power switch IC with 8-bit SPI serial interface, designed for automotive load control. It delivers 1.0 A peak per output, features 53 V internal output clamping, supports 5.5–26.5 V supply range, and operates across –40°C to +125°C ambient for under-hood applications including lighting, solenoids, and relays.
For engineers reviewing the MC33291DWR2 datasheet, MC33291DWR2 pinout, MC33291DWR2 application, or MC33291DWR2 equivalent, this page provides verified technical context, validated pin functions, real-world diagnostic behavior, thermal shutdown thresholds, and confirmed alternatives for automotive body control modules and industrial I/O expansion.
Technical Context
The MC33291DWR2 integrates SMARTMOS technology-CMOS logic, bipolar/MOS analog monitoring, and DMOS power MOSFETs-to enable independent per-output diagnostics, open-load detection, and short-circuit protection. Its SPI interface operates up to 3.0 MHz with full-duplex communication using CS, SCLK, SI, and SO pins.
Each output incorporates self-limiting current (1.0–3.0 A), overtemperature shutdown (155–180°C), and a dedicated 53 V clamp. Fault reporting occurs via tri-state SO pin with configurable timing: 70–250 μs delay for short-fault disable and open-load reporting when SFPD is grounded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output count | 8 independent low-side switches with individual fault reporting |
| Peak output current | 1.0 A per channel, self-limiting to prevent thermal runaway during inrush |
| RDS(ON) @ 150°C | ≤1.6 Ω at VPWR = 13 V - ensures <1.6 W dissipation per channel at 1 A |
| SPI clock frequency | Up to 3.0 MHz - enables fast command throughput for time-critical load sequencing |
| Supply voltage range | 5.5 V to 26.5 V VPWR - supports cold-crank (5.5 V) and load-dump (26.5 V) conditions |
| Sleep current | 25 μA max - meets automotive quiescent current requirements for always-on modules |
| Output clamp voltage | 53 V typical - suppresses inductive kickback without external TVS diodes |
Pinout & Package
MC33291DWR2 is housed in a 24-pin SOICW (wide-body) package with exposed pad for thermal management. Pin layout follows standard DW suffix footprint per Freescale's 98ASB42344B drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OP0–OP7 | Drain terminals of 8 DMOS outputs | Low-side switching nodes; each connects directly to load ground return path |
| VPWR | Main power supply input | Drives gate drive circuitry and output DMOS; rated for transients up to 60 V |
| VDD | Logic supply input | 5 V CMOS-compatible supply for internal logic and SPI interface |
| CS | Chip select active-low | Enables SPI data transfer and latches output states on rising edge |
| SCLK | SPI clock input | Falls-edge sampled for SI; controls shift register timing and SO output timing |
| SI | SPI serial data input | Accepts 8-bit command word to set output ON/OFF states |
| SO | SPI serial data output | Tri-stateable; reports fault status (open load, overcurrent, overvoltage) per output |
| SFPD | Short-fault protect disable | Grounding disables automatic latch-off during overcurrent - enables current-limit mode |
| RST | Active-low reset | Clears SPI shift register and forces all outputs OFF; used for safe startup |
| GND | Power and signal ground | Pins 5–8 and 17–20 form thermal path to PCB; must be connected to solid ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Per-output open-load detection | Reports OFF-state open loads via SO pin with 30–100 μA detection threshold |
| Independent output shutdown | Only faulty output shuts down; others remain operational - improves system availability |
| 53 V output clamp | Integrated clamp eliminates need for external TVS on each output - reduces BOM count |
| SPI cascade capability | Multiple MC33291DWR2 devices daisy-chain via SO→SI connection - scales to 32+ loads with one MCU port |
| Overvoltage lockout | Full device shutdown at VPWR ≥28 V; auto-recovery below 26.5 V - protects against load dump |
Applications
| Automotive Lighting Control | Engine Management Solenoids |
|---|---|
Use Scenario: Controlling headlamp, fog lamp, and interior lighting circuits in modern body control modules. IC Role / Device Role / Timing Role: Low-side driver managing PWM dimming and fault-safe turn-off for incandescent and LED loads. Use Value: Built-in 53 V clamp absorbs inductive energy from relay coils; open-load detection confirms bulb integrity without external circuitry. | Use Scenario: Driving fuel injectors, idle air control valves, and EGR solenoids in engine control units. IC Role / Device Role / Timing Role: Precision-controlled low-side switch with microsecond-level timing (tDLY(ON) ≤50 μs) for accurate pulse-width modulation. Use Value: Self-limiting current prevents coil burnout during stuck-open faults; thermal shutdown isolates single failed solenoid without disabling entire bank. |
| Industrial I/O Expansion | Commercial Vehicle Trailer Control |
Use Scenario: Adding 8-channel switched outputs to PLCs or embedded controllers for valve, actuator, and indicator control. IC Role / Device Role / Timing Role: SPI-configurable I/O expander replacing discrete transistor arrays and optocouplers. Use Value: 3.0 MHz SPI interface allows rapid reconfiguration; daisy-chaining supports modular rack systems with minimal MCU pin usage. | Use Scenario: Managing trailer brake lights, turn signals, and ABS modulator valves in Class 8 truck cab electronics. IC Role / Device Role / Timing Role: Ruggedized low-side driver meeting ISO 7637-2 pulse 5a/5b transient immunity requirements. Use Value: 26.5 V VPWR rating handles alternator regulation spikes; -40°C to +125°C operation ensures reliability in unheated trailer harness junction boxes. |
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 |
|---|---|---|---|
| TPIC6B595N | 8-bit shift-register output driver with open-drain outputs; no integrated diagnostics or clamping; RDS(ON) ~2.5 Ω; no SFPD or RST pins | Lacks per-output fault reporting, thermal shutdown, and overvoltage protection - requires external protection components | Choose for cost-sensitive non-automotive applications where diagnostics are handled externally |
| MAX14914AUB+ | 8-channel industrial-grade high-side/low-side configurable switch; includes 60 V clamp, ±10 kV ESD, and programmable current limit; SPI interface with CRC error checking | Supports both high- and low-side configurations; higher ESD rating; more complex register map and configuration overhead | Choose when mixed high/low-side topology or enhanced industrial EMC robustness is required |
Compared with TPIC6B595N, MC33291DWR2 adds integrated diagnostics, thermal safety, and automotive-grade transient tolerance; compared with MAX14914AUB+, it offers simpler SPI protocol, lower gate-drive complexity, and proven field reliability in automotive body electronics.
Availability
MC33291DWR2 is available at Aetrix Electronics and suitable for automotive lighting control, engine management solenoids, and industrial I/O expansion requiring stable component supply across extended temperature and voltage ranges.
Supply support for MC33291DWR2 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
NXP Semiconductors is a global semiconductor leader focused on automotive, industrial, and IoT applications, delivering secure, reliable, and energy-efficient solutions.
The MC33291DWR2 belongs to NXP's SMARTMOS automotive power switch family, engineered specifically for intelligent, fault-tolerant load control in harsh vehicle environments with minimal external components.
FAQ
What is the maximum operating voltage for MC33291DWR2?
The MC33291DWR2 supports a normal operating supply range of 5.5 V to 26.5 V on the VPWR pin. Its absolute maximum transient rating is 60 V for up to 100 ms with a 100 Ω series resistor, making it suitable for automotive load-dump conditions. The logic supply (VDD) is rated for 4.5 V to 5.5 V. Exceeding these limits may cause permanent damage.
Does MC33291DWR2 support daisy-chaining multiple devices?
Yes, MC33291DWR2 supports SPI daisy-chaining: the Serial Output (SO) pin of one device connects to the Serial Input (SI) pin of the next. This allows cascading up to four MC33291DWR2 units (32 outputs) using only three MCU pins (CS, SCLK, SI/SO shared). Each device retains independent fault reporting through its own SO pin when configured in parallel-select mode.
How does MC33291DWR2 handle overtemperature events?
MC33291DWR2 implements per-output overtemperature shutdown with a trip threshold of 155–180°C. Only the affected output turns OFF while others continue operating. Hysteresis of 10–20°C prevents oscillation. Recovery occurs automatically once junction temperature falls below the hysteresis threshold. This behavior is documented in Table 1 and Figure 2 of the Freescale MC33291 datasheet Rev 5.
What is the purpose of the SFPD pin on MC33291DWR2?
The SFPD (Short-Fault Protect Disable) pin on MC33291DWR2 determines fault response mode: when pulled to GND, overcurrent events trigger immediate output shutdown; when held at 5.0 V, the device enters current-limit mode instead of latching OFF. This allows sustained operation during temporary inrush currents (e.g., incandescent lamp startup) without disrupting other channels.
Can MC33291DWR2 drive inductive loads without external flyback diodes?
Yes, MC33291DWR2 includes an internal 53 V clamp on each output, enabling safe switching of inductive loads such as relays and solenoids without external flyback diodes. The clamp activates during turn-off to absorb stored energy. However, for loads exceeding 50 mJ clamp energy rating or requiring faster decay, external suppression remains recommended per design validation testing.
MC33291DWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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 ~ 3.5V
- Current - Output (Max):
- 500mA
- Rds On (Typ):
- 550mOhm
- 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
MC33291DWR2 FAQ
1.How can I place an order for MC33291DWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33291DWR2 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 MC33291DWR2 reliable?
The price and inventory of MC33291DWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33291DWR2 is usually 5 days.
3.What payment methods are accepted for MC33291DWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33291DWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33291DWR2?
MC33291DWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33291DWR2 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 MC33291DWR2?
For technical support, including MC33291DWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33291DWR2 requirements.
6.How does Aetrix verify that MC33291DWR2 is sourced from the original manufacturer or authorized distributors?
All MC33291DWR2 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 MC33291DWR2 meets industry standards.
7.What is the process for return or replacement of MC33291DWR2?
All MC33291DWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC33291DWR2, 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 MC33291DWR2 part is unused and in its original packaging.
Return procedure for MC33291DWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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