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NXP Semiconductors MC33660BEF
- Part No.:
- MC33660BEF
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC33660BEF.pdf
- Description:
- IC INTERFACE SPECIALIZED 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,658
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Product details
Overview
MC33660BEF from NXP Semiconductors is an ISO K-line serial bus interface IC designed for automotive on-board diagnostics (OBD) communication between microcontrollers and external diagnostic tools via the ISO 9141-2 physical layer. It provides bidirectional half-duplex level translation between 5.0 V CMOS logic and battery-level (8–18 V) bus signals, features thermal shutdown with hysteresis, short-circuit protected ISO output, and operates across -40 °C to +125 °C ambient temperature.
For engineers reviewing the MC33660BEF datasheet, MC33660BEF pinout, MC33660BEF application, or MC33660BEF equivalent, this device is selected for robust K-line interface design in OBD-II compliant vehicle ECUs, where bus fault resilience, module-level ESD immunity (±25 kV air discharge), and wide supply voltage tolerance are critical selection criteria.
Technical Context
The MC33660BEF implements a dedicated ISO 9141-2 K-line transceiver function using SMARTMOS process technology, integrating bipolar/MOS analog circuitry and DMOS power FETs for high-voltage robustness. Its internal architecture includes a current-limited active pull-down on the ISO pin, internal VDD-referenced TX/RX thresholds, and a chip-enable (CEN) input with built-in pull-down for sleep-state control.
It supports up to 150 kbps data rates governed by ISO fall time ≤2.0 µs (with 10 nF bus capacitance) and propagation delay ≤2.0 µs. The device meets ISO 7637-2/3 Pulse 5a (45 V) and 5b (82 V) load dump immunity and achieves ±25 kV module-level ESD protection on the ISO pin when used with a 33 V zener diode and 470 pF capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBB Supply Range | 8.0 V to 18 V - enables direct connection to automotive battery rail without external regulation |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood ECU deployment and industrial environments |
| ISO Fall Time | ≤2.0 µs - supports reliable 150 kbps K-line communication with up to 10 nF bus capacitance |
| Module-Level ESD | ±25,000 V (air discharge, powered) - achieved with external 33 V zener + 470 pF on ISO pin |
| Thermal Shutdown | 150 °C to 170 °C hysteresis - prevents latch-up during sustained bus shorts or overtemperature events |
| VDD Sleep Current | ≤0.1 mA - minimizes quiescent power draw in diagnostic standby mode |
| ISO Short-Circuit Limit | 50–200 mA - protects against bus-to-battery shorts while maintaining functional integrity |
Pinout & Package
MC33660BEF is housed in an 8-pin SOICN (Small Outline Integrated Circuit, Narrow) package with Pb-free (EF suffix) finish, optimized for surface-mount assembly and automotive thermal cycling reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VBB | Battery supply input | Accepts 8–18 V automotive battery rail; supports ISO 7637-2/3 load dump immunity (45 V/82 V) |
| 2 - NC | No-connect terminal | Must remain unconnected; not guaranteed open - no routing or soldering permitted |
| 3 - GND | Signal and power return | Common reference for VDD, VBB, ISO, TX, RX, and CEN; requires low-impedance PCB plane |
| 4 - ISO | K-line bus interface | Bi-directional half-duplex bus node; internally protected against shorts to battery and ESD |
| 5 - TX | Transmit input | CMOS-compatible logic input (0.3×VDD / 0.7×VDD thresholds); includes internal passive pull-up to VDD |
| 6 - RX | Receive output | CMOS-compatible logic output (0.2×VDD low / 0.8×VDD high); drives MCU SCIRxD pin directly |
| 7 - VDD | Digital logic supply | 5.0 V ±5% supply for internal logic; decoupling capacitor required near pin |
| 8 - CEN | Chip enable control | Active-high enable; internal pull-down ensures sleep state on power-up or MCU reset |
Key Features
| Feature | Design Value |
|---|---|
| ISO K-line short-circuit protection | Current-limited active pull-down (50–200 mA) prevents damage during bus-to-battery faults |
| Wide VBB operating range | 8.0–18 V operation eliminates need for external DC-DC regulator in 12 V/24 V vehicle systems |
| Thermal shutdown with hysteresis | 150 °C trip / 170 °C release prevents oscillation and ensures safe recovery after overtemperature events |
| ESD-hardened ISO interface | ±25 kV module-level air discharge immunity achievable with minimal external components (33 V zener + 470 pF) |
| Low-power sleep mode | VBB sleep current ≤50 µA and VDD sleep current ≤0.1 mA reduce parasitic drain during vehicle off-state |
Applications
| Automotive On-Board Diagnostics (OBD-II) | Farm Equipment Telematics |
|---|---|
|
Use Scenario: Communication between engine control unit (ECU) and handheld scan tool during emissions testing or service diagnostics. IC Role / Device Role / Timing Role: ISO 9141-2 K-line transceiver translating 5 V MCU UART signals to battery-referenced bus levels with precise timing compliance. Use Value: Ensures interoperability with CARB-compliant diagnostic tools and survives harsh vehicle electrical transients (load dump, reverse battery). |
Use Scenario: Diagnostic link between tractor ECU and service laptop in field maintenance of precision agriculture systems. IC Role / Device Role / Timing Role: Robust K-line interface enabling firmware updates and sensor calibration over extended cable runs in high-noise environments. Use Value: Delivers >150 kbps data rate with <2 µs ISO fall time and ±25 kV ESD immunity - critical for outdoor equipment exposed to static and moisture. |
| Industrial Vehicle Control Systems | Marine Engine Monitoring |
|
Use Scenario: Integration into forklift or mining vehicle controller for real-time fault logging and remote diagnostics via service port. IC Role / Device Role / Timing Role: Fault-tolerant serial interface bridging industrial MCU UART to K-line bus, supporting thermal shutdown and wide VBB range. Use Value: Operates reliably from -40 °C to +125 °C ambient and withstands 82 V load dump pulses - essential for heavy-duty mobile machinery. |
Use Scenario: Connection between marine diesel engine ECU and onboard diagnostic display or shore-based service interface. IC Role / Device Role / Timing Role: ISO K-line transceiver providing galvanically isolated communication path with corrosion-resistant packaging (SOICN EF). Use Value: Achieves ±25 kV ESD protection and 45 V ISO clamp energy handling - mitigates electrostatic risks in humid, salt-laden marine environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ISO K-line transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33664AEF | Integrated L-line driver; higher VBB max rating (28 V); lower ISO fall time (1.5 µs); no module-level ESD spec provided | Required for full ISO 9141-2 dual-line (K+L) implementations; not suitable for K-line-only designs needing ±25 kV ESD | Select MC33664AEF only if L-line support and faster timing are needed; otherwise MC33660BEF offers superior ESD hardening for K-line-only use cases |
| TJA1055T/3 | Single-supply (5 V only); no VBB pin; lower thermal shutdown threshold (140 °C); ±8 kV HBM ESD (no module-level spec) | Limited to low-voltage board-level interfaces; lacks automotive battery-rail robustness and load dump immunity | Choose TJA1055T/3 only for non-automotive, 5 V-only embedded systems; MC33660BEF remains preferred for under-hood battery-connected applications |
Compared with MC33664AEF and TJA1055T/3, the MC33660BEF uniquely combines K-line-only optimization, ±25 kV module-level ESD capability, and 8–18 V VBB operation - making it the most suitable choice for cost-sensitive, single-line automotive diagnostic modules requiring field-proven transient resilience.
Availability
MC33660BEF is available at Aetrix Electronics and suitable for automotive OBD-II modules, farm equipment telematics units, and industrial vehicle control systems requiring stable component supply across extended product lifecycles.
Supply support for MC33660BEF 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, with deep expertise in automotive-grade analog and interface ICs.
The MC33660BEF belongs to NXP's legacy automotive interface portfolio, engineered specifically for ISO 9141-2 K-line diagnostics in harsh environments - emphasizing fault tolerance, wide voltage operation, and ESD resilience over general-purpose UART level-shifting.
FAQ
What is the primary bus standard supported by the MC33660BEF?
The MC33660BEF is designed exclusively for ISO 9141-2 K-line physical layer communication. It does not support ISO 9141-2 L-line, CAN, LIN, or other protocols. Its internal timing, voltage thresholds, and protection features are optimized for K-line diagnostics in automotive OBD-II systems, and it complies fully with California Air Resources Board (CARB) requirements for on-board diagnostics.
Does the MC33660BEF require external components to meet ISO 7637-2/3 load dump immunity?
Yes - the MC33660BEF achieves ISO 7637-2/3 Pulse 5a (45 V) and Pulse 5b (82 V) immunity only when used with recommended external protection: a 470 Ω series resistor and 100 nF capacitor to GND on the VBB pin. These components limit peak current and absorb transient energy; omitting them voids the specified load dump rating and risks permanent damage during battery transients.
How does the MC33660BEF handle reverse battery conditions?
The MC33660BEF itself does not include reverse battery protection. System-level reverse polarity immunity must be implemented externally - typically using a blocking diode (e.g., Schottky) in series with the VBB line, as shown in Figure 8 of the datasheet. This diode prevents current flow into the device when battery terminals are reversed, protecting both the MC33660BEF and downstream circuitry from damage.
What is the maximum bus capacitance the MC33660BEF can drive while maintaining 150 kbps operation?
The MC33660BEF maintains ≤2.0 µs ISO fall time - required for 150 kbps K-line operation - with up to 10 nF of total bus capacitance (including cable, connectors, and stubs), per Table 5 and Figure 6 in the datasheet. Exceeding 10 nF increases fall time beyond specification, degrading signal integrity and potentially causing communication errors at maximum data rate.
Is the MC33660BEF pin-compatible with earlier versions like MC33660EF?
No - the MC33660BEF is not pin-compatible with the original MC33660EF. The "B" revision introduces updated internal protection structures, including enhanced ESD circuitry and modified thermal shutdown behavior, but retains identical pinout and package (8-pin SOICN). However, due to differences in VBB load dump ratings and ESD test configurations, direct substitution requires validation of system-level transient performance.
MC33660BEF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- -
- Interface:
- Serial Link Bus Interface
- Voltage - Supply:
- 8V ~ 18V
- Supplier Device Package:
- 8-SOIC
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
MC33660BEF FAQ
1.How can I place an order for MC33660BEF through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33660BEF 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 MC33660BEF reliable?
The price and inventory of MC33660BEF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33660BEF is usually 5 days.
3.What payment methods are accepted for MC33660BEF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33660BEF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33660BEF?
MC33660BEF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33660BEF 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 MC33660BEF?
For technical support, including MC33660BEF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33660BEF requirements.
6.How does Aetrix verify that MC33660BEF is sourced from the original manufacturer or authorized distributors?
All MC33660BEF 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 MC33660BEF meets industry standards.
7.What is the process for return or replacement of MC33660BEF?
All MC33660BEF units undergo pre-shipment inspection (PSI). If there is an issue with MC33660BEF, 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 MC33660BEF part is unused and in its original packaging.
Return procedure for MC33660BEF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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