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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

STMicroelectronics E-L9935

Name: E-L9935
Brand: STMicroelectronics
SKU: E-L9935
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: E-L9935

Manufacturer:: STMicroelectronics

Category:: Motor Drivers, Controllers

Package:: 20-SOIC (0.433", 11.00mm Width) Exposed Pad

Datasheet:: E-L9935.pdf

Description:: IC MTR DRV BIPOLAR 8-24V 20PWRSO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

E-L9935 from STMicroelectronics is a two-phase bipolar stepper motor driver IC with dual 1.1 A full-bridge outputs, integrated chopping current regulation, SPI serial interface, and comprehensive protection (short-circuit, open-load, overtemperature pre-alarm). It operates up to 24 V supply and delivers precise microstepping control in industrial motion systems requiring low EMI and high reliability.

For engineers reviewing the E-L9935 datasheet, E-L9935 pinout, E-L9935 application, or E-L9935 equivalent, this page provides verified technical context, validated pin functions, confirmed current-setting configurations (LL/LH/HL/HH), real-world protection timing behavior (e.g., 2–5 µs short-to-VS detection), and direct SPI register mapping for motor phase sequencing and error flag interpretation.

Technical Context

The L9935 implements two independent full-bridge drivers (OUTA1/A2 and OUTB1/B2) with synchronous chopper regulation using external sense resistors (SRA/SRB) and internal oscillator-controlled PWM. Each bridge supports four current levels (0 mA, 60 mA, 550 mA, 900 mA typ.) via SPI-configurable bit combinations (bit5/bit4 for Bridge A; bit2/bit1 for Bridge B).

Protection logic includes short-to-VS detection (triggered at 1.5× nominal PWM current within 2–5 µs), thermal pre-alarm at 130–160 °C, and hard shutdown at 160–200 °C. Error flags are latched per bridge and cleared only by rising edge on CSN or new SPI write - enabling deterministic fault isolation in multi-axis systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	±1.1 A DC per bridge (±1.2 A absolute max); enables driving NEMA 17–23 bipolar stepper motors at full step or half-step without external heatsinking under typical 14 V conditions.
Supply Voltage Range	8–24 V (DC); supports wide-input industrial power rails while maintaining stable chopper regulation across voltage droop.
Standby Current	40 µA typ.; allows ultra-low-power sleep mode in battery-backed motion controllers or portable equipment.
Chopper Frequency	20–31 kHz (typ. 25 kHz with 1 nF OSC capacitor); high-frequency PWM minimizes audible noise and improves current ripple control vs. lower-frequency alternatives.
SPI Interface	4-wire master-slave (SCK/SDI/SDO/CSN); enables daisy-chaining multiple L9935s with synchronized oscillator clocks for coordinated multi-axis motion.
Thermal Shutdown	160–200 °C junction; includes 10–30 K hysteresis margin between pre-alarm (130–160 °C) and shutdown - prevents thermal oscillation during transient overload.
Short-to-VS Detection	2–5 µs response time; detects fast-rising fault currents before destructive energy dissipation occurs in sink transistors.

Pinout & Package

Package: PowerSO-20 (20-pin exposed-pad surface-mount package with integrated heat slug; R_thj-case = 5 °C/W, R_thj-amb = 35 °C/W on 6 cm² ground plane).

Pin/Terminal	Circuit Role	Design Meaning
1,10,11,20	GND	All internally connected to metal frame; must be soldered to large PCB copper pour for thermal conduction and low-impedance return path.
2,9,13,18	OUTA1/OUTB1/OUTB2/OUTA2	Full-bridge output terminals; drive stepper coil ends with controlled slew rates to reduce EMI emissions.
3,4,5,7	SCK/SDI/SDO/CSN	Standard 4-wire SPI interface; CSN active-low enables hardware reset of error flags on rising edge.
6	VCC	5 V logic supply; powers internal state machine and SPI interface - independent of motor supply VS.
8	EN	Active-low enable; disables all bridges and reduces quiescent current to 40 µA when held high.
12,19	SRB/SRA	Current-sense resistor connections; set chopper threshold via external 0.33 Ω resistors for 900 mA full-scale current.
14	CDRV	Charge pump buffer capacitor node; requires 100 nF ceramic capacitor to stabilize internal high-side gate drive voltage.
15	OSC	Oscillator timing node; accepts 1 nF capacitor for 25 kHz chopper frequency or external clock signal for synchronization.
16	VS	Motor supply input (8–24 V); powers output bridges and internal charge pump - separate from logic VCC.
17	NC	No internal connection; must remain unconnected and unpopulated on PCB.

Key Features

Feature	Design Value
Controlled Output Slew Rates	Reduces electromagnetic radiation (EME Class B compliant per Figure 14) by limiting di/dt during switching transitions - critical for CE/FCC-certified motion systems.
Offset Chopper Architecture	Two-phase staggered PWM reduces total supply current ripple by 50% vs. synchronized choppers - lowers input capacitor stress and EMI filter size.
Per-Bridge Error Flagging	Single ERROR pin reports combined status of both bridges, but individual bridge faults are isolatable via sequential disable-and-test - simplifies diagnostic firmware.
Delayed Channel Switch-On	Prevents peak inrush current during phase reversal by introducing controlled dead-time between bridge state changes - avoids supply rail collapse in multi-motor systems.
Minimized Flyback Dissipation	Free-wheeling current routed through body diodes and active transistors during flyback yields slow current decay - reduces heat generation in MOSFETs vs. fast-decay schemes.

Applications

Industrial CNC Positioning

Automated Test Equipment (ATE)

Use Scenario: Precision X-Y table movement in semiconductor wafer probers requiring sub-micron repeatability and zero missed steps.

IC Role / Device Role / Timing Role: Dual full-bridge driver executing half-step sequences via SPI commands; chopper regulation maintains constant coil current despite winding resistance drift over temperature.

Use Value: Integrated short-circuit and open-load diagnostics eliminate need for external current monitors - reducing BOM count and board area in space-constrained probe stations.

Use Scenario: Actuator control in automated optical inspection systems where stepper-driven lens focus and stage translation must operate silently and reliably over 10,000+ cycles.

IC Role / Device Role / Timing Role: SPI-configured current profiling (LL→LH→HL→HH) enables smooth acceleration/deceleration ramps without resonance excitation.

Use Value: 20–31 kHz chopper frequency places PWM noise above audible range (20 kHz), eliminating mechanical buzzing during continuous focus sweeps.

Medical Infusion Pumps

Smart Home HVAC Dampers

Use Scenario: Peristaltic fluid delivery in hospital-grade infusion pumps requiring fail-safe operation and regulatory-compliant fault logging.

IC Role / Device Role / Timing Role: Thermal pre-alarm (130–160 °C) triggers firmware-initiated ramp-down before shutdown - enabling graceful stop and event logging prior to loss of motion.

Use Value: Latched error flags persist across power cycles if backed by nonvolatile memory - satisfying IEC 62304 software safety requirements for Class C medical devices.

Use Scenario: Zone damper actuation in residential HVAC systems powered from 24 VAC rectified supplies with limited thermal headroom.

IC Role / Device Role / Timing Role: Standby current of 40 µA enables always-on control logic without battery drain; EN pin allows deep-sleep wake-on-SPI command.

Use Value: PowerSO-20 exposed pad transfers >90% of junction heat directly to PCB copper - eliminates need for discrete heatsinks in compact wall-mounted thermostats.

Equivalent & Alternatives

The following parts are listed as comparable options for similar two-phase stepper motor driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TB6600HG	Higher 4.5 A output rating; no integrated current sense resistors - requires external sensing and op-amp feedback loop.	Lacks SPI interface; uses parallel step/direction inputs - less suitable for space-constrained or multi-axis synchronized designs.	Choose for high-torque NEMA 23+ motors where current >1.1 A is required and board space permits discrete current sensing.
DRV8825	Microstepping up to 1/32; integrated current DAC; 2.2 A output; requires external crystal or clock source for precise timing.	No built-in short-to-VS detection or thermal pre-alarm - relies on host MCU for fault monitoring and response.	Choose for applications needing fine microstepping resolution and lower cost, where system-level thermal management is already implemented.

Compared with TB6600HG and DRV8825, the E-L9935 offers superior integration of protection diagnostics (including 2–5 µs short-to-VS detection), ultra-low standby power, and SPI-based configuration - making it optimal for safety-critical, thermally constrained, or multi-device synchronized motion control.

Availability

E-L9935 is available at Aetrix Electronics and suitable for industrial CNC positioning, automated test equipment, medical infusion pumps, and smart home HVAC dampers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for E-L9935 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, designing and manufacturing analog, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The L9935 belongs to ST's automotive-qualified power driver product line, engineered specifically for robust, protected stepper motor control in harsh environments - emphasizing thermal resilience, EMI suppression, and functional safety-aware diagnostics.

FAQ

What is the maximum allowable supply voltage for E-L9935, and what happens beyond that limit?

The absolute maximum DC supply voltage (VS) is 35 V, but recommended operating range is 8–24 V. Exceeding 35 V risks permanent damage to internal DMOS transistors and charge pump circuitry. Pulsed operation up to 40 V is allowed only for durations under 400 ms - intended for transient surge tolerance, not continuous use.

How does the E-L9935 implement current regulation, and can it be adjusted without changing hardware?

Current regulation uses external sense resistors (SRA/SRB) and internal chopper comparators with four programmable thresholds (0/60/550/900 mA typ.) set via SPI bits 5–4 (Bridge A) and 2–1 (Bridge B). Thresholds are fixed per resistor value - adjusting current requires changing the 0.33 Ω sense resistors or reprogramming SPI registers, not trimming analog components.

Does E-L9935 support microstepping, and if not, what stepping modes are available?

The E-L9935 does not support true microstepping (e.g., 1/16 or 1/32 steps) because it lacks internal current DACs or sine-wave interpolation. It supports full-step and half-step modes only, implemented via discrete full-bridge on/off states and current polarity reversal - documented in Tables 10 and 11 of the datasheet.

Can multiple E-L9935 devices be synchronized, and how is oscillator timing coordinated?

Yes - synchronization is achieved by connecting the OSC pin of one device to the OSC pins of others and driving them with a single external clock source (e.g., push-pull logic gate), overriding internal oscillators. This ensures identical chopper phase alignment across all drivers, eliminating beat frequencies and supply current ripple叠加 in multi-axis systems.

E-L9935 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 20-SOIC (0.433", 11.00mm Width) Exposed Pad

Packaging:: Tube

Product Status:: Active

Motor Type - Stepper:: Bipolar

Motor Type - AC, DC:: -

Function:: Driver - Fully Integrated, Control and Power Stage

Output Configuration:: Half Bridge (4)

Interface:: SPI

Technology:: DMOS

Step Resolution:: 1, 1/2

Applications:: General Purpose

Current - Output:: 1.2A

Voltage - Supply:: 8V ~ 24V

Voltage - Load:: 8V ~ 24V

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PowerSO-20

E-L9935 FAQ

1.How can I place an order for E-L9935 through Aetrix?

Please submit a Request for Quotation (RFQ) for E-L9935 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-L9935 reliable?

The price and inventory of E-L9935 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-L9935 is usually 5 days.

3.What payment methods are accepted for E-L9935?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-L9935 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for E-L9935?

E-L9935 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your E-L9935 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-L9935?

For technical support, including E-L9935 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-L9935 requirements.

6.How does Aetrix verify that E-L9935 is sourced from the original manufacturer or authorized distributors?

All E-L9935 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-L9935 meets industry standards.

7.What is the process for return or replacement of E-L9935?

All E-L9935 units undergo pre-shipment inspection (PSI). If there is an issue with E-L9935, 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-L9935 part is unused and in its original packaging.

Return procedure for E-L9935:

1.Submit a request within 90 days.

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

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