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NXP Semiconductors MC33999EKR2
- Part No.:
- MC33999EKR2
- Manufacturer:
- NXP Semiconductors
- Package:
- 54-BSSOP (0.295", 7.50mm Width) Exposed Pad
- Datasheet:
-
MC33999EKR2.pdf
- Description:
- IC PWR SWITCH N-CH 1:16 54SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,320
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Product details
Overview
MC33999EKR2 from NXP Semiconductors (formerly Freescale) is a 16-channel low-side power switch IC with 24-bit SPI control, parallel PWM inputs, and integrated fault management. It delivers programmable current-limited outputs (0.9–2.5 A), +50 V output voltage clamping, and independent overtemperature protection. Designed for automotive and industrial load control, it drives inductive, incandescent, and LED loads while offloading fault diagnostics from the MCU.
For engineers reviewing the MC33999EKR2 datasheet, MC33999EKR2 pinout, MC33999EKR2 application, or MC33999EKR2 equivalent, key selection considerations include its 54-pin SOICW-EP package, VPWR operating range (5.0–27 V), RDS(on) of 0.55 Ω (typ. at 25 °C), SPI-compatible 3.3/5.0 V logic interface, and support for both daisy-chained and parallel PWM control architectures.
Technical Context
The MC33999EKR2 implements SMARTMOS technology-integrating CMOS logic, bipolar/MOS analog circuitry, and DMOS power transistors-to enable robust fault detection (open-load, short-to-VBAT/OFF, overtemperature, overvoltage) and autonomous protection without MCU intervention. Its dual-control architecture supports simultaneous SPI command/data transfer and direct parallel PWM input for eight dedicated outputs (OUT0, OUT1, OUT6–OUT9, OUT14, OUT15).
Internally, the device uses SENSEFET-based current limiting, independent per-output thermal shutdown (155–180 °C), and a 50 mJ clamp energy rating per output during inductive turn-off. The SOPWR-supplied SO driver enables tri-state diagnostic readout via SPI, with fault status reported as logic [1] on SO for any fault condition-including global overvoltage (27.5–35 V threshold) and undervoltage lockout (VPWR < 3.2–4.0 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output count | 16 independent low-side MOSFET switches with individual fault reporting |
| VPWR supply range | 5.0 V to 27 V - supports wide automotive battery voltage variation including cold-crank and load-dump conditions |
| RDS(on) | 0.55 Ω typical at 25 °C - enables efficient switching of up to 2.5 A per channel with minimal conduction loss |
| Output clamp voltage | +50 V - protects against inductive kickback in solenoid, relay, and motor applications |
| SPI interface speed | Up to 6.0 MHz - allows fast configuration and real-time fault polling in time-critical systems |
| Standby current | <10 µA at VPWR - ensures ultra-low quiescent draw when SOPWR is disabled for sleep mode |
| Operating temperature | -40 °C to +125 °C ambient - qualified for under-hood automotive and harsh industrial environments |
Pinout & Package
MC33999EKR2 is housed in a 54-pin SOICW-EP (exposed pad) package optimized for thermal dissipation in high-power switching applications. The exposed thermal pad must be soldered to PCB copper for effective heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT0–OUT15 | Low-side power output | 16 independent DMOS drain terminals; each capable of 0.9–2.5 A current-limited switching with open/short fault detection |
| SCLK, SI, SO, CS | SPI interface | Full-duplex 24-bit serial interface compatible with 3.3 V/5.0 V CMOS logic; SO provides fault status readout on falling CS edge |
| PWM0, PWM1, PWM6–PWM9, PWM14, PWM15 | Parallel PWM input | Eight dedicated inputs enabling direct hardware PWM control of corresponding outputs without SPI overhead |
| PWM | Global PWM control | Single input supporting programmable PWM across any combination of outputs via SPI register configuration |
| RST | Active-low reset | Asynchronous clear of all internal registers and forced OFF state for all outputs |
| VPWR | Main power supply | Battery input monitored for overvoltage (27.5–35 V) and undervoltage (3.2–4.0 V) shutdown |
| SOPWR | SO driver supply | Separate 3.1–5.5 V supply for SO output driver and POR circuit; removal places device in ultra-low-power sleep mode (<10 µA VPWR current) |
| GND (pins 11–17, 38–40, 42–44) | Ground reference | Multiple dedicated ground pins for logic, analog, and power domains to minimize noise coupling and improve EMI performance |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-output overtemperature protection | Shuts down only faulted channel (155–180 °C trip) while others remain operational - improves system availability |
| Programmable output current limit | 0.9–2.5 A range per channel - configurable via SPI to match load requirements and reduce thermal stress |
| Output OFF open-load detection | 25–100 µA pulldown current per output - enables reliable lamp/LED breakage detection without external components |
| Parallel output capability | Outputs can be paralleled internally due to positive RDS(on) temperature coefficient - supports higher current or lower loss without external balancing |
| Dual-mode PWM control | Supports both dedicated parallel PWM inputs (8 channels) and software-configurable global PWM - offers flexibility for real-time vs. programmable timing needs |
Applications
| Automotive Body Control Module | Aircraft Lighting & Actuation |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, seat adjusters, and interior/exterior lighting in modern vehicle platforms. IC Role / Device Role / Timing Role: Low-side switch managing up to 16 independent 12 V DC loads with integrated diagnostics and fault isolation. Use Value: Reduces MCU GPIO count and firmware complexity by consolidating load control and fault reporting into one SPI-accessible device with <10 µA standby current. |
Use Scenario: Reliable switching of cabin lighting, landing gear indicators, and small hydraulic actuators in certified avionics systems. IC Role / Device Role / Timing Role: High-reliability power switch with +50 V clamp and independent thermal shutdown per output for safety-critical load management. Use Value: Eliminates need for discrete TVS diodes and thermal sensors per channel, simplifying design qualification and reducing BOM cost. |
| Industrial Robotic End-Effector Control | Marine & Agricultural Equipment |
Use Scenario: Driving solenoids, gripper motors, and status LEDs on robotic arms where space, thermal headroom, and fault resilience are critical. IC Role / Device Role / Timing Role: 16-channel bus-expanding switch with daisy-chain SPI support for modular I/O expansion in compact controllers. Use Value: Enables deterministic response via parallel PWM inputs for time-sensitive actuation while retaining full diagnostic visibility via SPI. |
Use Scenario: Controlling work lights, hydraulic valves, winch controls, and instrumentation displays in tractors, harvesters, and marine vessels. IC Role / Device Role / Timing Role: Ruggedized low-side driver rated for 5–27 V VPWR and -40 to +125 °C operation in high-vibration, moisture-prone environments. Use Value: Withstands battery transients and reverse polarity (with external protection), reduces field failure rates through autonomous short/open detection. |
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 |
|---|---|---|---|
| MC33880PG | 8-channel low-side switch; lacks parallel PWM inputs and has lower max VPWR (26 V); no exposed pad package | Lower channel count and reduced thermal capability limit use in high-density or high-power applications | Choose when fewer outputs are needed and board-level thermal management is less constrained |
| TPS4H160-Q1 | 4-channel high-side switch; different topology (high-side vs. low-side); includes built-in watchdog and enhanced diagnostics | Not functionally interchangeable due to high-side architecture and lack of parallel PWM support | Consider only if high-side switching, ASIL-B compliance, or integrated watchdog functionality is required |
Compared with MC33880PG and TPS4H160-Q1, the MC33999EKR2 uniquely combines 16 low-side channels, parallel PWM inputs, +50 V clamping, and an exposed-pad thermally enhanced package-making it optimal for space-constrained, high-channel-count automotive and industrial load banks requiring autonomous fault handling.
Availability
MC33999EKR2 is available at Aetrix Electronics and suitable for automotive body control modules, aircraft lighting systems, industrial robotics, marine equipment, and agricultural machinery requiring stable component supply across extended temperature and voltage ranges.
Supply support for MC33999EKR2 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications. Formerly Freescale Semiconductor, it acquired the MC33999 product line as part of its automotive analog and power portfolio.
The MC33999EKR2 belongs to NXP's SMARTMOS automotive power switch family, engineered specifically for intelligent, fault-resilient load control in harsh environments-emphasizing integration, diagnostics, and thermal robustness over discrete alternatives.
FAQ
What is the maximum continuous current per output of the MC33999EKR2?
The MC33999EKR2 provides programmable current limiting per output, with a specified range of 0.9 A to 2.5 A. This limit is enforced by internal SENSEFET circuitry and remains active across the full operating temperature range (-40 °C to +125 °C). At 25 °C, RDS(on) is typically 0.55 Ω, enabling efficient conduction within this current window. The MC33999EKR2 datasheet confirms these values under static electrical characteristics (Table 4).
Does the MC33999EKR2 support daisy-chaining multiple devices via SPI?
Yes, the MC33999EKR2 supports daisy-chain SPI configuration. In this mode, the SO pin of one device connects to the SI pin of the next, with a shared SCLK and CS line. Each device requires 24 bits of data, and fault status is shifted out sequentially on the SO line during the CS low period. Figure 10 in the MC33999EKR2 datasheet explicitly illustrates this topology and confirms compatibility with standard SPI master implementations.
How does the MC33999EKR2 handle overvoltage events on the VPWR pin?
The MC33999EKR2 monitors VPWR for overvoltage conditions with a threshold of 27.5–35 V and 1.4 V typical hysteresis. When exceeded for >50 µs, all outputs shut down immediately. The Overvoltage Fault bit (bit 22) and Any Fault bit (bit 23) in the SO response register are set to logic [1], allowing the MCU to detect and respond. Recovery occurs automatically once VPWR returns to normal, with output behavior governed by the Global Shutdown/Retry Control register setting. This behavior is documented in Section 5.1 and Table 4 of the MC33999EKR2 datasheet.
Can outputs of the MC33999EKR2 be paralleled to increase current capacity?
Yes, outputs of the MC33999EKR2 can be safely paralleled on the same die due to the positive temperature coefficient of RDS(on), which promotes natural current sharing. Paralleling reduces effective RDS(on) and increases total current capability while maintaining per-output fault detection. However, paralleling outputs across separate MC33999EKR2 devices is not recommended due to mismatched thresholds and timing. This capability is explicitly described in the "Paralleling of Outputs" section (page 14) of the MC33999EKR2 datasheet.
What is the purpose of the SOPWR pin on the MC33999EKR2?
The SOPWR pin supplies power exclusively to the SO output driver and Power-On Reset (POR) circuit. Removing power from SOPWR places the MC33999EKR2 into ultra-low-power sleep mode, reducing VPWR supply current to <10 µA. While in this state, all outputs are disabled and the SO pin is tri-stated. SOPWR must be between 3.1 V and 5.5 V for normal operation. Critically, the MC33999EKR2 does not monitor SOPWR for overvoltage, and undervoltage below 2.0–3.0 V triggers global shutdown. These functions are defined in the Functional Pin Description section (page 11) of the MC33999EKR2 datasheet.
MC33999EKR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 54-BSSOP (0.295", 7.50mm Width) Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Switch Type:
- General Purpose
- Number of Outputs:
- 16
- Ratio - Input:Output:
- 1:16
- Output Configuration:
- Low Side
- Output Type:
- N-Channel
- Interface:
- SPI
- Voltage - Load:
- 5V ~ 27V
- Voltage - Supply (Vcc/Vdd):
- 1.5V ~ 3V
- Current - Output (Max):
- 900mA
- Rds On (Typ):
- 550mOhm
- Input Type:
- -
- Features:
- PWM Input
- 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:
- 54-SOIC-EP
MC33999EKR2 FAQ
1.How can I place an order for MC33999EKR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33999EKR2 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 MC33999EKR2 reliable?
The price and inventory of MC33999EKR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33999EKR2 is usually 5 days.
3.What payment methods are accepted for MC33999EKR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33999EKR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33999EKR2?
MC33999EKR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33999EKR2 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 MC33999EKR2?
For technical support, including MC33999EKR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33999EKR2 requirements.
6.How does Aetrix verify that MC33999EKR2 is sourced from the original manufacturer or authorized distributors?
All MC33999EKR2 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 MC33999EKR2 meets industry standards.
7.What is the process for return or replacement of MC33999EKR2?
All MC33999EKR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC33999EKR2, 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 MC33999EKR2 part is unused and in its original packaging.
Return procedure for MC33999EKR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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