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Allegro MicroSystems UDN2987LW-6-T
- Part No.:
- UDN2987LW-6-T
- Manufacturer:
- Allegro MicroSystems
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UDN2987LW-6-T.pdf
- Description:
- IC PWR DRIVER BIPOLAR 1:1 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,763
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Product details
Overview
UDN2987LW-6-T from Allegro MicroSystems is an 8-channel high-side source driver IC with integrated overcurrent protection, thermal shutdown, and output clamp diodes. It interfaces 5 V/12 V logic (TTL/CMOS compatible) to relays, solenoids, LEDs, and incandescent lamps, delivering up to 350 mA per channel at 35 V supply and operating across –20°C to +85°C ambient.
For engineers reviewing the UDN2987LW-6-T datasheet, UDN2987LW-6-T pinout, UDN2987LW-6-T application, or UDN2987LW-6-T equivalent, key selection criteria include its 35 V output sustaining voltage, 200 ns typical tPHL propagation delay, OE/R-controlled latching behavior, fault reporting via open-collector FAULT pin, and SOIC-W package thermal resistance of 48 °C/W.
Technical Context
The UDN2987LW-6-T implements eight independent high-side drivers, each with a current-sense comparator, latch, and blanking timer (tBLANK = 1.0 µs) to suppress false overcurrent triggers during inductive switching. Each channel trips at –370 mA minimum, disabling only that output while others remain active.
It features a common thermal shutdown (TJTSD = 165°C, hysteresis = 15°C) that resets all latches and disables all outputs, plus an open-collector FAULT output pulled low on any channel fault or thermal event. The OE/R input enables/disables all outputs and resets latches - critical for safe power-up sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.75 V to 35 V - supports direct connection to industrial 24 V rails and 5 V logic without level-shifting. |
| Max Continuous Output Current | 350 mA per channel - validated at 25°C ambient and 35 V VS; derates with temperature and duty cycle. |
| Output Sustaining Voltage | ≥35 V - enables safe operation with inductive loads generating flyback voltages up to 35 V. |
| Propagation Delay (tPHL) | 200 ns typical - ensures fast turn-off response for time-critical load control in automation systems. |
| Overcurrent Trip Threshold | –370 mA min per channel - provides precise, matched-current sensing with built-in blanking to avoid false trips. |
| Thermal Shutdown Threshold | 165°C junction - protects against sustained overload or poor heatsinking; resumes operation at ~150°C due to hysteresis. |
| Input Compatibility | TTL, CMOS, DTL, PMOS - accepts 5 V or 12 V logic high (≥2.4 V) and tolerates inputs down to –0.3 V. |
Pinout & Package
Package: 20-pin SOIC-W (wide-body), lead-free with 100% matte-tin plating; JEDEC MS-013 AC compliant; RθJA = 48 °C/W on 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1–IN8 | Logic input (active-high) | Enable corresponding output channel; compatible with 5 V/12 V logic families. |
| OE/R | Output Enable / Reset | Pull high to enable all outputs; pull low ≥1 µs to reset all latches and inhibit outputs - essential for controlled startup. |
| FAULT | Open-collector fault indicator | Pulled low on any channel overcurrent or chip thermal shutdown; requires external pull-up for system-level monitoring. |
| OUT1–OUT8 | High-side sourcing outputs | Each sources up to 350 mA to load; includes internal clamp diode to VS for inductive kickback suppression. |
| VS | Power supply input | Connects to 4.75–35 V rail; supplies all driver channels and internal circuitry. |
| GND | Ground reference | Common return path for logic inputs, fault output, and internal sense circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel overcurrent protection | Independent latch-based shutdown at –370 mA min; prevents single-fault propagation across channels. |
| Integrated clamp diodes | Internal ground-referenced diodes on each OUT pin - eliminates need for external flyback diodes with inductive loads. |
| Thermal shutdown with hysteresis | 165°C trip with 15°C hysteresis - avoids oscillation near thermal limit and ensures stable recovery. |
| Fast propagation timing | tPHL = 200 ns typ - enables high-frequency PWM control of lamps or solenoids without timing skew. |
| OE/R-controlled safe startup | Active-low reset pulse ≥1 µs clears all latches - prevents spurious output activation during power ramp. |
Applications
| Industrial PLC I/O Modules | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Driving 24 V DC solenoid valves and relay coils in modular I/O racks with shared 24 V bus. IC Role / Device Role / Timing Role: High-side interface between microcontroller GPIO and inductive loads; provides per-channel fault isolation and transient suppression. Use Value: Eliminates discrete protection components per channel, reduces PCB area by >30%, and enables real-time fault detection via FAULT pin. |
Use Scenario: Controlling LED status indicators and small DC motors in programmable ATE fixture boards. IC Role / Device Role / Timing Role: Logic-level-to-load interface with fast tPHL (200 ns) for synchronized stimulus/response sequencing. Use Value: Enables precise timing-critical actuation without external timing compensation; OE/R allows global reset before test step transitions. |
| Commercial HVAC Control Panels | Point-of-Sale (POS) Peripheral Drivers |
|
Use Scenario: Switching incandescent pilot lamps and small fans in wall-mounted HVAC controllers powered from 24 V AC/DC. IC Role / Device Role / Timing Role: Eight-channel sourcing driver with thermal margin for continuous lamp operation in enclosed enclosures. Use Value: Sustains 350 mA per channel at 85°C ambient; internal clamp diodes prevent damage from lamp filament inrush transients. |
Use Scenario: Powering receipt printer solenoids, cash drawer actuators, and status LEDs in compact POS terminals. IC Role / Device Role / Timing Role: Consolidated load interface replacing multiple discrete transistors and protection diodes. Use Value: Reduces BOM count by 8× vs. discrete solutions; FAULT pin alerts host MCU to jammed mechanisms or shorted coils. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-channel high-side driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TB9058FNG | Higher max output current (500 mA), automotive-grade AEC-Q100 qualified, but no OE/R reset function. | Requires external reset logic; better suited for automotive body control modules than industrial I/O. | Choose if AEC-Q100 compliance and higher current are required, and OE/R reset is implemented externally. |
| ULN2803A | Low-side sink driver (not source), no overcurrent protection, no FAULT output, 500 mA per channel. | Requires load connection to VS; unsuitable for floating-load or common-ground architectures. | Choose only if existing design uses low-side switching and fault monitoring is handled at system level. |
Compared with TB9058FNG and ULN2803A, the UDN2987LW-6-T uniquely combines high-side sourcing, per-channel overcurrent latching, OE/R-controlled reset, and FAULT reporting in a single SOIC-W package - making it optimal for industrial control where load grounding constraints and fault diagnostics are critical.
Availability
UDN2987LW-6-T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automated test equipment (ATE), and commercial HVAC control panels requiring stable component supply despite its Not for New Design status.
Supply support for UDN2987LW-6-T 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
Allegro MicroSystems is a U.S.-based designer and manufacturer of high-performance power ICs and magnetic sensors, headquartered in Manchester, NH.
The UDN2987LW-6-T belongs to the DABIC-5 family of protected high-side drivers, engineered specifically for robust industrial and commercial load interfacing where reliability, fault visibility, and simplified layout are prioritized over ultra-high current or automotive qualification.
FAQ
What is the maximum recommended output current per channel for UDN2987LW-6-T?
The UDN2987LW-6-T is tested and specified for a maximum continuous output current of 350 mA per channel at TA = 25°C and VS = 35 V. Operation above –370 mA may trigger the overcurrent latch. Derating is required at higher ambient temperatures or duty cycles - refer to the "Allowable Output Current vs. Duty Cycle" graph in the datasheet for precise limits.
Does UDN2987LW-6-T support 12 V logic inputs?
Yes, UDN2987LW-6-T supports 12 V logic inputs: its input voltage range is –0.3 V to 14 V, and VIN(ON) is specified at 2.4 V minimum. Input current remains within spec (≤1000 µA) at 12 V, making it fully compatible with both 5 V and 12 V TTL/CMOS systems without external level-shifting.
How does the FAULT pin behave during overcurrent or thermal events?
The FAULT pin on UDN2987LW-6-T is an open-collector output that is pulled low (active) whenever any channel experiences overcurrent or when thermal shutdown activates. It remains low until the fault condition clears - for overcurrent, the affected latch must be reset via OE/R; for thermal shutdown, the junction must cool below ~150°C.
Is UDN2987LW-6-T pin-compatible with earlier UDN2987 variants?
Yes, UDN2987LW-6-T shares identical pinout and package (20-pin SOIC-W) with other UDN2987x-6 variants including UDN2987LWTR-6-T. Electrical specifications and functional behavior are consistent across the x-6 family; differences are limited to packaging format (reel vs. tube) and ordering suffixes.
Why is UDN2987LW-6-T marked "Not for New Design"?
UDN2987LW-6-T is classified Not for New Design as of October 1, 2022, indicating Allegro has restricted sales to existing customer applications due to probable near-term obsolescence. It remains available for production continuity but is not recommended for new designs; engineers should consult Allegro Sales for migration paths to newer alternatives.
UDN2987LW-6-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Type:
- General Purpose
- Number of Outputs:
- 8
- Ratio - Input:Output:
- 1:1
- Output Configuration:
- High Side
- Output Type:
- Bipolar
- Interface:
- On/Off
- Voltage - Load:
- 4.75V ~ 35V
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 350mA
- Rds On (Typ):
- -
- Input Type:
- Non-Inverting
- Features:
- Status Flag
- Fault Protection:
- Current Limiting (Fixed), Over Temperature
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
UDN2987LW-6-T FAQ
1.How can I place an order for UDN2987LW-6-T through Aetrix?
Please submit a Request for Quotation (RFQ) for UDN2987LW-6-T 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 UDN2987LW-6-T reliable?
The price and inventory of UDN2987LW-6-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UDN2987LW-6-T is usually 5 days.
3.What payment methods are accepted for UDN2987LW-6-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UDN2987LW-6-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UDN2987LW-6-T?
UDN2987LW-6-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UDN2987LW-6-T 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 UDN2987LW-6-T?
For technical support, including UDN2987LW-6-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UDN2987LW-6-T requirements.
6.How does Aetrix verify that UDN2987LW-6-T is sourced from the original manufacturer or authorized distributors?
All UDN2987LW-6-T 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 UDN2987LW-6-T meets industry standards.
7.What is the process for return or replacement of UDN2987LW-6-T?
All UDN2987LW-6-T units undergo pre-shipment inspection (PSI). If there is an issue with UDN2987LW-6-T, 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 UDN2987LW-6-T part is unused and in its original packaging.
Return procedure for UDN2987LW-6-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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