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Home > Products > Integrated Circuits (ICs) > Interface > Drivers, Receivers, Transceivers

STMicroelectronics E-L9637D013TR

Name: E-L9637D013TR
Brand: STMicroelectronics
SKU: E-L9637D013TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: E-L9637D013TR

Manufacturer:: STMicroelectronics

Category:: Drivers, Receivers, Transceivers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: E-L9637D013TR.pdf

Description:: IC TRANSCEIVER 1/1 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

E-L9637D013TR from STMicroelectronics is an ISO 9141-compliant monolithic bus driver for automotive diagnostic K-line communication, operating from 4.5 V to 36 V (40 V transient), featuring bidirectional K-I/O with 60 mA typical output current, <1 mA standby current at VCC ≤ 0.5 V, and integrated pull-up resistors on TX, RX, and LO pins. It supports diagnostic ECU-to-tester communication in OBD-II systems.

For engineers reviewing the E-L9637D013TR datasheet, E-L9637D013TR pinout, E-L9637D013TR application, or E-L9637D013TR equivalent, key selection criteria include K-line voltage threshold hysteresis (0.025 × VS), thermal shutdown thresholds (160–200 °C), defined OFF-state behavior during undervoltage, and EMI-optimized output slew control for ISO 9141 compliance.

Technical Context

The L9637 implements a supply-voltage-dependent input threshold architecture for both K and LI pins, with hysteresis (VKhys = 0.025 × VS) to reject line spikes. Its K-I/O path includes overtemperature shutdown selective to the K pin, and controlled rise/fall times (2–6 µs) to meet ISO 9141 EMI requirements.

Functional isolation between VS-referenced bus pins (K, LI) and VCC-referenced logic pins (TX, RX, LO) enables robust operation across battery voltage transients. Output states are fully defined under open-circuit (TX/LI/K), undervoltage (VS or VCC loss), and reverse-battery (VS ≥ −24 V) conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply voltage range	4.5 V to 36 V (40 V transient tolerant); supports full automotive battery range including cold-crank and load-dump events.
K output current (typ)	60 mA; sufficient to drive ISO 9141 K-line with 510 Ω termination and ≤1.3 nF capacitance per spec.
Standby current ISSB	<1 mA @ VCC ≤ 0.5 V; enables zero-power system sleep mode during ECU deactivation.
Quiescent current ISOFF	120 µA @ VS ≤ 12 V; minimizes parasitic drain when TX, LI, and K inputs are high.
K input threshold hysteresis	0.025 × VS (min); ensures noise immunity against ±2 kV HBM ESD and Schaffner-class transients.
Rise/fall time (K-RX)	2–6 µs @ RKO = 510 Ω, CK ≤ 1.3 nF; meets ISO 9141-2 edge rate limits for low-radiated emissions.
Thermal shutdown threshold	160–200 °C (TJSDon); protects K-driver stage during sustained short-circuit or high-ambient conditions.

Pinout & Package

Package: SO8 (ECOPACK®), 150 mil width, standard JEDEC MS-012AC footprint with 1.27 mm pitch.

Pin/Terminal	Circuit Role	Design Meaning
RX	K-line receive output	VCC-referenced TTL-compatible output; internal 5–20 kΩ pull-up; defined HIGH/LOW states per VK thresholds.
LO	L-line comparator output	VCC-referenced open-drain output with 5–20 kΩ pull-up; monitors battery-related L signal for diagnostics.
VCC	Stabilized logic supply	Internal regulator output (3–7 V); powers TX/RX/LO logic and pull-ups; shuts down below 0.5 V for true standby.
TX	K-line transmit input	TTL-compatible input with 10–40 kΩ internal pull-up; defines K output direction when asserted.
GND	Common reference	Logic ground return; high-impedance during VS/GND interruption to prevent latch-up.
K	Bidirectional K-line I/O	VS-referenced bidirectional bus pin; 10–30 Ω ON impedance; 30–100 mA short-circuit current limit.
VS	Main supply input	Direct connection to automotive battery (−24 V to +40 V); reverse-battery protected; powers K-driver stage.
LI	L-line input	VS-referenced comparator input with hysteresis; triggers LO output based on L-line voltage relative to VS.

Key Features

Feature	Design Value
Supply-voltage-dependent input thresholds	Enables reliable K/L detection across 9–16 V battery range without external level-shifting components.
Defined output states under fault	Outputs go high-impedance during VS undervoltage or GND interruption-prevents bus contention and false diagnostics.
Controlled output slope	Rise/fall times limited to 2–6 µs to reduce radiated EMI and meet ISO 9141-2 electromagnetic compatibility requirements.
Integrated pull-up resistors	Eliminates need for four external resistors (TX, RX, LO, RTX), reducing BOM count and PCB area in ECU designs.
Reverse-battery protection	Operates down to VS = −24 V; prevents damage during battery installation errors in vehicle service environments.

Applications

OBD-II Diagnostic Interface

Automotive ECU Wake-Up Circuit

Use Scenario: Connecting a handheld OBD-II scanner to a vehicle's K-line for readout of DTCs and live data.

IC Role / Device Role / Timing Role: Acts as the physical layer interface between microcontroller UART and ISO 9141 K-bus, translating logic-level TX/RX to VS-referenced K signaling.

Use Value: Enables compliant 10.4 kbaud K-line communication with built-in transient protection and no external level shifters required.

Use Scenario: Enabling ECU power management by detecting K-line activity during vehicle ignition-off state.

IC Role / Device Role / Timing Role: Monitors K-line for wake-up pulses via LI input and asserts LO output to trigger microcontroller reset or enable sequencing.

Use Value: Provides defined LO output status even with open LI or VS loss, ensuring deterministic wake-up behavior in low-power modes.

K-Line Bus Driver in Body Control Module

Diagnostic Gateway Node

Use Scenario: Driving K-line signals from a BCM microcontroller to support dealer-level programming and calibration.

IC Role / Device Role / Timing Role: Buffers and isolates MCU TX/RX from harsh automotive K-bus environment, handling ±24 V faults and 40 V transients.

Use Value: Delivers 60 mA K output current with 10–30 Ω ON resistance, ensuring robust signal integrity over long harness runs.

Use Scenario: Serving as a bridge between legacy K-line tools and modern CAN-based vehicle networks in multi-protocol gateways.

IC Role / Device Role / Timing Role: Translates ISO 9141 K-line messages into UART frames for CAN gateway MCU processing.

Use Value: Integrates K-line physical layer with minimal external components, reducing gateway BOM cost and board space.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ISO 9141 bus driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MC33290DTBR2G	Wider operating temperature (−40°C to +125°C vs. −40°C to +150°C); no integrated VCC regulator; requires external 5 V supply.	Lacks VCC regulation and standby mode; not suitable for systems requiring zero-VCC sleep functionality.	Select if external 5 V rail is available and thermal shutdown at 150 °C is acceptable.
TLE6250G	Designed for high-speed LIN (20 kbaud) with different timing specs; no LI input or L-comparator function.	Not ISO 9141-compliant; lacks K-line bidirectional control and diagnostic L-line monitoring capability.	Select only for LIN bus applications-not a drop-in replacement for K-line diagnostic use cases.

Compared with MC33290DTBR2G and TLE6250G, E-L9637D013TR uniquely integrates VCC regulation, standby mode (<1 mA), and dual K/L-line support-making it the only choice for full-featured ISO 9141 diagnostic ECUs requiring low-power sleep and L-line wake-up capability.

Availability

E-L9637D013TR is available at Aetrix Electronics and suitable for automotive OBD-II interfaces, ECU wake-up circuits, body control modules, and diagnostic gateway nodes requiring stable component supply across extended temperature and voltage ranges.

Supply support for E-L9637D013TR 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 quality certifications.

The L9637 belongs to ST's automotive interface and bus driver product line, engineered specifically for ISO 9141-2 K-line diagnostic communication in engine control units and body electronics where robustness, low quiescent current, and integrated protection are critical.

FAQ

What is the maximum allowable external pull-up resistance on the K pin?

The maximum external pull-up resistance on the K pin must not exceed 5 kΩ to ensure clear ON-state definition under all VS conditions (4.5–36 V). This value is specified in Section 3 of the datasheet to guarantee proper logic-level transitions and avoid marginal operation during low-VS or high-temperature conditions.

Does E-L9637D013TR support simultaneous K and L-line communication?

No-it does not support simultaneous K and L communication. The LI input and LO output operate independently of the K-I/O path, but the device processes them sequentially: LI triggers LO assertion, while K handles bidirectional serial data. Both share the same VS supply and thermal shutdown domain, but have separate internal signal paths.

How does the device behave when VCC is disconnected while VS remains active?

When VCC is disconnected (e.g., VCC = open), TX, RX, and LO become high-impedance, but K and LI remain functional with defined thresholds and protection. The K output retains its VS-referenced drive capability, and LO assumes a defined ON state if LI is open-ensuring diagnostic bus integrity even during partial power loss.

Is the E-L9637D013TR qualified for automotive AEC-Q100?

Yes-E-L9637D013TR is AEC-Q100 qualified (Grade 1: −40°C to +125°C ambient), with full qualification documented in ST's official product release and supported by thermal data (Rth j-amb = 130–180 °C/W) and junction temperature limits (TJ up to +150 °C) in the datasheet.

E-L9637D013TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Transceiver

Protocol:: ISO 9141

Number of Drivers/Receivers:: 1/1

Duplex:: -

Receiver Hysteresis:: -

Data Rate:: -

Voltage - Supply:: 4.5V ~ 36V

Operating Temperature:: -40°C ~ 150°C

Grade:: Automotive

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

E-L9637D013TR FAQ

1.How can I place an order for E-L9637D013TR through Aetrix?

Please submit a Request for Quotation (RFQ) for E-L9637D013TR 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 E-L9637D013TR reliable?

The price and inventory of E-L9637D013TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-L9637D013TR is usually 5 days.

3.What payment methods are accepted for E-L9637D013TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-L9637D013TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for E-L9637D013TR?

E-L9637D013TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your E-L9637D013TR 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 E-L9637D013TR?

For technical support, including E-L9637D013TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-L9637D013TR requirements.

6.How does Aetrix verify that E-L9637D013TR is sourced from the original manufacturer or authorized distributors?

All E-L9637D013TR 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 E-L9637D013TR meets industry standards.

7.What is the process for return or replacement of E-L9637D013TR?

All E-L9637D013TR units undergo pre-shipment inspection (PSI). If there is an issue with E-L9637D013TR, 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 E-L9637D013TR part is unused and in its original packaging.

Return procedure for E-L9637D013TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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