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STMicroelectronics L9856-TR-LF
- Part No.:
- L9856-TR-LF
- Manufacturer:
- STMicroelectronics
- Category:
- Gate Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
L9856-TR-LF.pdf
- Description:
- IC GATE DRVR HIGH-SIDE 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,478
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Product details
Overview
L9856-TR-LF from STMicroelectronics is a high-voltage high-side gate driver IC designed to control N-channel power MOSFETs in floating high-side configurations. It supports rail voltages up to 160 V, delivers ±500 mA peak source/sink current, achieves 100 ns rise/fall times with 2.5 nF load, and features CMOS/TTL Schmitt-trigger inputs with hysteresis for noise immunity-used in industrial motor drives and half-bridge inverters.
For engineers reviewing the L9856-TR-LF datasheet, L9856-TR-LF pinout, L9856-TR-LF application, or L9856-TR-LF equivalent, key selection criteria include dV/dt immunity (±50 V/ns), bootstrap-capacitor loading circuit integration, inverting logic input, under-voltage lockout on both VCC and VB supplies, and SO-8 package compatibility with standard PCB layout practices.
Technical Context
The L9856-TR-LF implements a level-shifted high-side driver architecture with integrated break-before-make logic and dedicated recharge path for bootstrap capacitor replenishment. Its floating section operates with VS referenced to VB up to 150 V, while logic interface remains isolated at 5 V VCC.
It incorporates dual undervoltage lockout (UVLO) circuits-one for VCC (4.3 V turn-on, 2.8 V turn-off) and one for VB (identical thresholds)-plus reset-controlled enable functionality and pulse filtering to suppress false triggering from fast transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max rail voltage | 160 V - enables direct drive of high-voltage N-MOSFETs in off-line AC/DC and motor control topologies |
| dV/dt immunity | ±50 V/ns - ensures reliable operation during fast switching transitions without false turn-on in noisy industrial environments |
| Output current | ±500 mA - sufficient to rapidly charge/discharge gate capacitance of medium-power MOSFETs (e.g., Qg ≈ 25 nC @ 10 V) |
| Rise/fall time | 100 ns @ 2.5 nF - supports >1 MHz switching in resonant converters and high-frequency inverters |
| Logic input type | Inverting Schmitt trigger - provides noise margin >1.2 V and eliminates metastability from slow-rising control signals |
| UVLO hysteresis | 0.3 V typical - prevents oscillation near threshold during brown-out conditions |
| Operating temp | –40 °C to +125 °C - qualified for extended industrial ambient and junction temperature ranges |
Pinout & Package
Supplied in a standard SO-8 surface-mount package (ECOPACK®, lead-free), the L9856-TR-LF uses an 8-pin layout with one no-connect (NC) terminal and dedicated pins for bootstrap supply (VB), floating source (VS), gate output (HO), logic ground (GND), and dual active-low control inputs (IN-, RESET-).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Low-side logic supply | 5 V ±10 % digital supply for internal logic and level shifters; independent of high-side operation |
| 2 IN- | Inverting logic input | Active-low gate control signal; Schmitt-trigger input with 0.28×VCC low threshold and 0.6×VCC high threshold |
| 3 GND | Reference ground | Common return for VCC and logic circuitry; must be isolated from power ground in high-side configurations |
| 4 RESET- | Active-low enable | Hardware reset input; forces HO low and disables output regardless of IN- state when asserted |
| 5 VS | Floating source node | Connection to MOSFET source; serves as local reference for high-side driver stage and UVLO monitoring |
| 6 NC | No connection | Internally unconnected pin; must remain unpopulated and unconnected on PCB |
| 7 HO | High-side gate output | Push-pull output driving MOSFET gate; swings from VS to VB with ±500 mA capability |
| 8 VB | Bootstrap supply input | Connects to charged bootstrap capacitor; supplies floating high-side driver stage up to 166 V absolute max |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bootstrap recharge path | Dedicated transistor and timing control (DTHOFF = 3–9 µs, DTHON = 0.1–0.7 µs) automatically replenishes bootstrap capacitor between switching cycles |
| Dual independent UVLO | Separate lockout circuits monitor both VCC and VB supplies, each with 0.3 V hysteresis and sub-20 µs response time |
| Break-before-make logic | Ensures dead-time insertion between high-side turn-off and bootstrap recharge activation to prevent shoot-through |
| High dV/dt noise immunity | Guaranteed ±50 V/ns across full –40 °C to +125 °C range-critical for reliability in IGBT/MOSFET half-bridge applications |
| CMOS/TTL compatible input | Accepts 0–5 V logic levels with built-in hysteresis; eliminates need for external signal conditioning in microcontroller-driven systems |
Applications
| Industrial Motor Drives | Switch-Mode Power Supplies |
|---|---|
|
Use Scenario: Driving high-side N-MOSFETs in three-phase BLDC inverter stages for HVAC compressors and pump controllers. IC Role / Device Role / Timing Role: High-side gate driver providing level-shifted, noise-immune gate control synchronized with complementary low-side PWM signals. Use Value: Enables efficient 100–200 kHz operation with <100 ns edge control and robust dV/dt rejection in electrically noisy motor control cabinets. |
Use Scenario: Controlling upper switch in non-isolated buck-derived topologies such as PFC boost stages and auxiliary DC-DC converters. IC Role / Device Role / Timing Role: Floating high-side driver delivering precise gate timing and bootstrap management for continuous conduction mode operation. Use Value: Maintains stable gate drive under wide input voltage swings (e.g., 85–265 VAC rectified) thanks to dual UVLO and 160 V rail rating. |
| Solar Microinverters | Induction Heating Systems |
|
Use Scenario: Gate driving in half-bridge H-bridge modules used in single-phase grid-tied microinverter output stages. IC Role / Device Role / Timing Role: High-side driver with fast propagation delay (<350 ns) and tight dead-time control to minimize switching losses and EMI. Use Value: Supports soft-switching techniques via accurate timing (tplhi = 0.1–0.35 µs) and low-output impedance for clean gate waveforms at 50–100 kHz. |
Use Scenario: Driving resonant half-bridge power switches in domestic and commercial induction cooktops operating at 20–100 kHz. IC Role / Device Role / Timing Role: Robust high-side driver handling rapid voltage transients and thermal stress in high-power ZVS/ZCS topologies. Use Value: Delivers consistent gate drive despite large dV/dt events (>30 V/ns) common in resonant tank ringing, preventing spurious turn-on. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IRS21844PbF | Higher max VB (600 V), but lower peak current (±260 mA); no integrated bootstrap recharge path | Requires external diode/capacitor bootstrap network and dead-time generation circuitry | Preferred where higher voltage rating is mandatory and board space allows discrete bootstrap design |
| UCC27712DR | 120 V max VB, 4 A peak current, integrated high-speed level shifter, no UVLO on VB supply | Lacks VB-supply monitoring; requires external UVLO supervision for bootstrap health detection | Better suited for compact, high-current designs below 120 V rails where fast switching dominates over fault protection |
Compared with IRS21844PbF and UCC27712DR, the L9856-TR-LF uniquely combines 160 V capability, integrated bootstrap recharge, dual UVLO, and SO-8 footprint-making it optimal for cost-sensitive, thermally constrained industrial half-bridges requiring minimal external components.
Availability
L9856-TR-LF is available at Aetrix Electronics and suitable for industrial motor drives, switch-mode power supplies, solar microinverters, and induction heating systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for L9856-TR-LF 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 solutions with broad IP and manufacturing scale.
The L9856 belongs to ST's high-voltage analog driver product line, engineered specifically for ruggedized high-side gate driving in industrial motor control and off-line power conversion applications.
FAQ
What is the purpose of the NC pin (Pin 6) on the L9856-TR-LF?
Pin 6 is a no-connect terminal with no internal bondwire or silicon connection. It must remain unconnected on the PCB layout and should not be tied to ground, power, or any other net. Leaving it floating is required per ST's mechanical and reliability specifications for the SO-8 package.
Can the L9856-TR-LF drive a MOSFET directly without external gate resistors?
While the L9856-TR-LF can deliver ±500 mA peak current, external gate resistors are strongly recommended to control slew rate, damp ringing, and limit peak current during Miller plateau crossing. Typical values range from 5 Ω to 22 Ω depending on MOSFET Qg, layout parasitics, and EMI requirements.
How does the bootstrap recharge path operate during continuous conduction?
The internal recharge transistor activates after high-side turn-off with a fixed dead-time (DTHOFF = 3–9 µs), pulling VS toward VB to replenish the bootstrap capacitor. The recharge duration is controlled by internal timing-no external components or clock signals are needed for proper operation.
Is the L9856-TR-LF compliant with RoHS and REACH regulations?
Yes-the L9856-TR-LF is supplied in an ECOPACK®-compliant SO-8 package, certified lead-free and fully compliant with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, including SVHC screening.
L9856-TR-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Driven Configuration:
- High-Side
- Channel Type:
- Single
- Number of Drivers:
- 1
- Gate Type:
- N-Channel MOSFET
- Voltage - Supply:
- 4.4V ~ 6.5V
- Logic Voltage - VIL, VIH:
- -
- Current - Peak Output (Source, Sink):
- 500mA, 500mA
- Input Type:
- Inverting
- High Side Voltage - Max (Bootstrap):
- 150 V
- Rise / Fall Time (Typ):
- 100ns, 100ns
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
L9856-TR-LF FAQ
1.How can I place an order for L9856-TR-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for L9856-TR-LF 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 L9856-TR-LF reliable?
The price and inventory of L9856-TR-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9856-TR-LF is usually 5 days.
3.What payment methods are accepted for L9856-TR-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9856-TR-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L9856-TR-LF?
L9856-TR-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L9856-TR-LF 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 L9856-TR-LF?
For technical support, including L9856-TR-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9856-TR-LF requirements.
6.How does Aetrix verify that L9856-TR-LF is sourced from the original manufacturer or authorized distributors?
All L9856-TR-LF 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 L9856-TR-LF meets industry standards.
7.What is the process for return or replacement of L9856-TR-LF?
All L9856-TR-LF units undergo pre-shipment inspection (PSI). If there is an issue with L9856-TR-LF, 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 L9856-TR-LF part is unused and in its original packaging.
Return procedure for L9856-TR-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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