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STMicroelectronics L9613B
- Part No.:
- L9613B
- Manufacturer:
- STMicroelectronics
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
L9613B.pdf
- Description:
- IC TRANSCEIVER HALF 1/1 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,106
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Product details
Overview
L9613B from STMicroelectronics is an ISO 9141-compatible automotive bus interface IC designed for K-line bidirectional diagnosis communication in ECU systems. It operates from 4.8V to 36V supply (40V transient tolerant), features reverse battery protection down to −24V, standby current ≤1 mA at VCC ≤ 0.5 V, and supports ≥130 kBaud data rates. Used in vehicle onboard diagnostics (OBD-II) modules for engine control units.
For engineers reviewing the L9613B datasheet, L9613B pinout, L9613B application, or L9613B equivalent, key selection criteria include K-I/O bidirectional voltage threshold dependency on VS, thermal shutdown selectivity for K-pin, defined OFF/ON states during under-voltage or open-circuit conditions, and integrated pull-up resistors on TX/RX/LO pins.
Technical Context
The L9613B implements a monolithic K-line transceiver with supply-voltage-dependent input thresholds on LI and K pins, enabling robust operation across wide battery voltage ranges (4.8–36 V). Its internal comparator-based L-line interface and TTL-compatible TX input allow integration into legacy ISO 9141-2 diagnostic architectures without external level-shifting.
Thermal shutdown activates selectively on the K-I/O pin above 160°C (typ.), with hysteresis ensuring stable re-enablement below 150°C. Output slope control minimizes EMI, while high-impedance behavior during VS/GND interruption and defined output states under open-TX/open-LI conditions ensure fail-safe bus behavior in automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 4.8 V to 36 V (40 V transient tolerant); enables direct connection to automotive battery rail without external regulation |
| Reverse battery protection | Operates down to −24 V on VS; prevents damage during incorrect battery installation |
| Standby current | ≤100 µA at VCC ≤ 0.5 V; supports ultra-low-power ECU sleep modes |
| K-line baud rate | ≥130 kBaud minimum; meets ISO 9141-2 timing requirements for fast diagnostic polling |
| K output current limit | 60 mA typical; limits fault current during short-to-battery or short-to-ground events |
| Input threshold hysteresis | 0.05VS to 0.2VS; suppresses noise-induced false triggering on K and LI lines |
| Thermal shutdown threshold | 160°C typ. (on), 150°C typ. (off); protects K driver under sustained overload or high ambient |
Pinout & Package
Package: SO8 (Small Outline, 8-lead, ECOPACK® lead-free). Dimensions per JEDEC MS-012, body width 3.9 mm, pitch 1.27 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RX | K-line receive output | Drives microcontroller RX input referenced to VCC; includes internal pull-up to VCC |
| LO | L-line comparator output | Open-drain output for L-line diagnostics; pull-up to VCC ensures defined HIGH when inactive |
| VCC | Stabilized internal supply | Regulated 5 V output (3–7 V input range); powers logic and pull-ups; low-impedance source |
| TX | K-line transmit input | TTL-compatible input; internal pull-up ensures defined HIGH if left floating |
| GND | Common reference | Logic ground; isolated from VS return path to avoid ground loop interference |
| K | Bidirectional K-line I/O | VBat-referenced bidirectional bus node; voltage thresholds scale with VS; current-limited to 60 mA |
| VS | Main supply input | Direct connection to battery rail; handles −24 V to +40 V transients; powers K/L drivers |
| LI | L-line input | VBat-referenced comparator input; hysteresis and overvoltage protection enable reliable L-line sensing |
Key Features
| Feature | Design Value |
|---|---|
| Supply-voltage-dependent input thresholds | K and LI thresholds scale with VS (e.g., VKhigh = 0.60VS), maintaining noise margin across 9–16 V battery range |
| Controlled output slew rate | Rise/fall times 0.4–2 µs; reduces radiated emissions to meet automotive EMC standards (e.g., ISO 11452) |
| Defined output state during fault | K, LO, RX go high-impedance if VS or GND is interrupted; prevents bus contention during wiring faults |
| Integrated pull-up resistors | 5–40 kΩ on TX, RX, LO (temperature-dependent); eliminates need for 3 external resistors in standard OBD-II layout |
| EMI-robust pin architecture | Withstands ±0.2 mJ Schaffner-class pulses on all pins; enables operation in noisy engine bay environments |
Applications
| OBD-II Diagnostic Interface | ECU Wake-Up Circuit |
|---|---|
Use Scenario: Connecting scan tools to vehicle ECUs via standardized 16-pin DLC connector for emissions testing and fault code retrieval. IC Role / Device Role / Timing Role: K-line transceiver translating microcontroller UART signals to ISO 9141-compliant bus levels; provides bidirectional half-duplex communication with controlled edge rates. Use Value: Enables compliance with SAE J1962 and ISO 15031-5; eliminates external level shifters and discrete protection components. | Use Scenario: Enabling ECU power-on from sleep mode upon detection of K-line activity (e.g., technician connecting scanner). IC Role / Device Role / Timing Role: K-line receiver detecting bus wake-up pulses; generates interrupt-capable RX signal to MCU while maintaining <100 µA standby draw. Use Value: Reduces system quiescent current to <20 µA total; meets ISO 19453-3 battery drain requirements for parked vehicles. |
| Body Control Module (BCM) Diagnostics | Chassis Domain Controller Interface |
Use Scenario: Integrating diagnostic access into non-engine ECUs such as door modules or lighting controllers for serviceability. IC Role / Device Role / Timing Role: Isolated K-line interface providing galvanically separated bus access; supports simultaneous L-line monitoring for enhanced protocol arbitration. Use Value: Allows shared K-line infrastructure across multiple domains without signal contention; simplifies wiring harness design. | Use Scenario: Interfacing ABS, airbag, or ADAS controllers to central diagnostic gateway for unified OBD reporting. IC Role / Device Role / Timing Role: Robust K-line buffer with thermal shutdown and reverse-battery protection; maintains communication integrity during cranking (6.5 V dips) and jump-start surges (28 V). Use Value: Guarantees >130 kBaud operation across full automotive temperature range (−40°C to +125°C junction); eliminates field failures due to voltage transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar K-line transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33290 | Higher quiescent current (250 µA vs. 100 µA); no L-line comparator; fixed 5 V VCC only | Lacks dual-line (K+L) support; requires external L-line circuitry for ISO 9141-2 full functionality | Select when only K-line is needed and VCC is regulated 5 V; avoid for battery-direct designs requiring reverse-battery tolerance |
| TLE6250G | Designed for high-speed CAN (not K-line); different pinout, no L-line interface, no ISO 9141 timing compliance | Not functionally equivalent-intended for CAN FD networks, not OBD-II K-line diagnostics | Reject for ISO 9141 applications; only consider if migrating entire system to CAN-based diagnostics |
Compared with MC33290 and TLE6250G, the L9613B uniquely integrates K+L line support, VS-referenced thresholds, and sub-100 µA standby-making it the only drop-in solution for legacy OBD-II ECU upgrades requiring minimal BOM change and full ISO 9141-2 compliance.
Availability
L9613B is available at Aetrix Electronics and suitable for automotive OBD-II interfaces, ECU wake-up circuits, body control module diagnostics, and chassis domain controller interfaces requiring stable component supply across extended temperature and voltage ranges.
Supply support for L9613B 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with broad manufacturing and R&D infrastructure.
The L9613B belongs to ST's automotive interface product line, engineered specifically for ISO 9141-2 and KWP2000 diagnostic protocols in engine control units and body electronics-prioritizing robustness against battery transients, reverse polarity, and EMI in harsh vehicle environments.
FAQ
What is the maximum transient voltage the L9613B can withstand on the VS pin?
The L9613B supports up to +40 V on the VS pin for transients lasting ≤400 ms, as specified in its absolute maximum ratings. This rating covers common automotive load-dump events per ISO 7637-2 Pulse 5a. Operation beyond this limit risks permanent damage, and the device does not include internal clamping beyond its rated capability-external TVS diodes are recommended for higher-energy transients.
Does the L9613B require external pull-up resistors on the K or L lines?
No external pull-up resistors are required on K or L lines. The L9613B integrates pull-ups on TX, RX, and LO pins referenced to VCC (5–10 kΩ typical at 25°C), and the K pin uses active drive with current limiting instead of passive pull-up. The LI pin has no pull-up but relies on internal hysteresis and comparator design for reliable L-line sensing without external components.
How does the L9613B behave during battery disconnection or ground loss?
When VS or GND is interrupted, all pins enter high-impedance state to prevent bus contention or backfeeding. Specifically, K, LO, and RX outputs become tri-stated, while TX input floats with its internal pull-up active. This behavior is explicitly guaranteed in the datasheet and ensures safe bus isolation during wiring faults or service disconnects-critical for multi-ECU diagnostic networks.
Can the L9613B operate with a 3.3 V microcontroller UART interface?
Yes-the TX input is TTL-compatible and accepts logic HIGH ≥3.5 V (at VCC ≤5.5 V), making it compatible with 3.3 V MCU outputs when VCC is ≥3.5 V. However, RX output swings to VCC, so a level shifter is required if the MCU RX pin is not 5 V tolerant. The internal VCC regulator (3–7 V input) allows direct connection to 3.3 V or 5 V supplies, but output voltage follows VCC-not the MCU IO voltage.
L9613B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Transceiver
- Protocol:
- ISO 9141
- Number of Drivers/Receivers:
- 1/1
- Duplex:
- Half
- Receiver Hysteresis:
- 250 mV
- Data Rate:
- -
- Voltage - Supply:
- 3V ~ 7V
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
L9613B FAQ
1.How can I place an order for L9613B through Aetrix?
Please submit a Request for Quotation (RFQ) for L9613B 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 L9613B reliable?
The price and inventory of L9613B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9613B is usually 5 days.
3.What payment methods are accepted for L9613B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9613B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L9613B?
L9613B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L9613B 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 L9613B?
For technical support, including L9613B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9613B requirements.
6.How does Aetrix verify that L9613B is sourced from the original manufacturer or authorized distributors?
All L9613B 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 L9613B meets industry standards.
7.What is the process for return or replacement of L9613B?
All L9613B units undergo pre-shipment inspection (PSI). If there is an issue with L9613B, 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 L9613B part is unused and in its original packaging.
Return procedure for L9613B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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