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Allegro MicroSystems UDK2559LBTR-T
- Part No.:
- UDK2559LBTR-T
- Manufacturer:
- Allegro MicroSystems
- Package:
- 16-PowerSOIC (0.295", 7.50mm Width)
- Datasheet:
-
UDK2559LBTR-T.pdf
- Description:
- IC PWR DRIVER BIPOLAR 1:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,214
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Product details
Overview
UDK2559LBTR-T from Allegro MicroSystems is a protected quad high-current bipolar power driver IC for industrial load switching, featuring four independent 700 mA sink outputs with integrated flyback diodes, TTL/5 V CMOS-compatible inputs, and per-channel overcurrent protection activated at 1.0 A. It operates across –40°C to +125°C and drives incandescent lamps, relays, solenoids, and unipolar stepper motors without external current-limiting resistors.
For engineers reviewing the UDK2559LBTR-T datasheet, UDK2559LBTR-T pinout, UDK2559LBTR-T application, or UDK2559LBTR-T equivalent, key selection criteria include its 16-pin SOICW package with fused leads, 40 V output sustaining voltage, thermal-limiting behavior under sustained overload, and compatibility with 5 V logic control systems in harsh ambient environments.
Technical Context
The UDK2559LBTR-T integrates four identical bipolar Darlington output stages, each with an internal low-value sense resistor enabling precise 1.0 A overcurrent trip detection and linear current limiting. Its architecture combines AND-gated input logic with thermal gradient sensing that first monitors junction temperature (TJ ≥ 165°C) then chip temperature to progressively reduce drive current during fault conditions.
Each channel includes integral clamp diodes rated for 1.7 V forward voltage at 1.0 A, supporting safe commutation of inductive loads. The device uses fused pins (4–5 and 12–13) in its LB package to enhance thermal dissipation, with RθJA = 90°C/W on a 1-layer PCB - optimized for surface-mount reliability in space-constrained industrial controls.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current (per channel) | 700 mA continuous sink capability supports direct driving of 12 V/24 V relays and solenoids without heatsinking. |
| Overcurrent Trip Threshold | 1.0 A per channel - triggers linear current limiting to protect against short circuits up to 25 V supply. |
| Output Sustaining Voltage | 40 V - enables safe operation with inductive kickback spikes below breakdown limit. |
| Input Logic Compatibility | TTL and 5 V CMOS - accepts standard microcontroller GPIO outputs without level-shifting. |
| Operating Temperature Range | –40°C to +125°C - qualified for under-hood automotive and industrial motor control environments. |
| Output Saturation Voltage | ≤500 mV at 400 mA - minimizes power loss and self-heating during steady-state conduction. |
| Thermal Limit Threshold | 165°C junction temperature - initiates secondary current reduction to prevent permanent damage. |
Pinout & Package
UDK2559LBTR-T uses a 16-lead wide-body SOIC (SOICW) package with internally fused pins 4–5 and 12–13 for enhanced thermal performance. Pin 1 is marked with a notch or dot; pin numbering follows JEDEC MS-013 AA standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 14, 15, 16 | Ground (GND) | Six dedicated ground terminals minimize common-impedance coupling and improve noise immunity across all four channels. |
| 4, 5, 12, 13 | Fused Output Pins | Internally fused pairs (4–5 and 12–13) provide mechanical and thermal robustness for high-current sinking paths. |
| 6, 7, 8, 9 | Outputs (OUT1–OUT4) | Open-emitter Darlington outputs capable of sinking 700 mA each with integrated flyback diodes. |
| 10, 11 | Inputs (IN1–IN4) | Logic-level inputs compatible with 0.8 V low / 2.0 V high TTL and CMOS thresholds. |
| 11 (shared) | Enable (ENABLE) | Global enable input - all outputs disabled when ENABLE < 0.8 V; no effect when left open or pulled high. |
| 16 (shared) | VCC | 5 V supply input - must be decoupled locally; powers internal logic and output bias networks. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel overcurrent protection | Independent 1.0 A trip point per output prevents single-fault propagation and preserves functionality of remaining channels. |
| Integrated flyback diodes | Clamp inductive kickback up to 1.7 V at 1.0 A, eliminating need for external diodes in relay/solenoid interfaces. |
| Fused lead construction | Pins 4–5 and 12–13 are internally fused to withstand repeated surge currents and improve long-term bond-wire reliability. |
| Low VOUT(SAT) | ≤500 mV at 400 mA reduces conduction losses to <200 mW per channel, easing thermal management in dense layouts. |
| Wide operating temperature range | –40°C to +125°C ambient rating supports deployment in engine compartments, factory automation, and outdoor control cabinets. |
Applications
| Automotive Relay Control | Industrial Solenoid Actuation |
|---|---|
Use Scenario: Controlling 12 V DC automotive relays in body control modules where space and thermal budget are constrained. IC Role / Device Role / Timing Role: Quad high-side switch replacement used as low-side sink driver with logic-level enable and fault tolerance. Use Value: Eliminates need for discrete flyback diodes and current-sense resistors while maintaining 1.0 A short-circuit resilience across all four relay coils. |
Use Scenario: Driving 24 V solenoid valves in programmable logic controller (PLC) output modules requiring robust fault recovery. IC Role / Device Role / Timing Role: Protected power interface between microcontroller I/O and inductive actuator loads. Use Value: Thermal limiting ensures continued operation during valve coil partial shorts, avoiding system shutdown during maintenance cycles. |
| Unipolar Stepper Motor Driver | Incandescent Lamp Dimming Interface |
Use Scenario: Phase sequencing of 5–24 V unipolar stepper motors in HVAC damper actuators and medical fluid pumps. IC Role / Device Role / Timing Role: Four-channel current sink driver synchronized via microcontroller PWM or step/direction signals. Use Value: Integrated flyback diodes suppress back-EMF spikes during rapid phase switching, preventing latch-up in adjacent logic circuitry. |
Use Scenario: Direct ON/OFF control of 12 V/24 V incandescent indicator lamps in industrial HMI panels without warm-up resistors. IC Role / Device Role / Timing Role: High-current lamp driver with built-in in-rush current limiting during cold filament turn-on. Use Value: Limits peak in-rush to ~1.0 A, extending lamp life and avoiding false tripping of upstream fuses or power supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad high-current sink driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UDK2559B-T | 16-pin DIP with exposed thermal tabs; RθJA = 43°C/W vs. LB's 90°C/W; same electrical specs and temp range. | Better thermal performance in through-hole designs with heatsink access; unsuitable for automated SMT assembly. | Select UDK2559B-T for prototyping or low-volume boards where manual soldering and thermal tab mounting are feasible. |
| UDK2559EBTR-T | 28-pin PLCC package; RθJA = 36°C/W; identical functional specs but different pinout and footprint. | Higher power density and superior thermal dissipation for high-duty-cycle multi-load applications; requires PLCC reflow profile. | Choose UDK2559EBTR-T when board space is limited and thermal load exceeds SOICW capability, especially in sealed enclosures. |
Compared with UDK2559LBTR-T, UDK2559B-T offers lower thermal resistance for through-hole integration, while UDK2559EBTR-T provides the highest thermal efficiency in compact surface-mount layouts - both retain identical overcurrent and temperature protection behaviors but require PCB redesign due to non-pin-compatible footprints.
Availability
UDK2559LBTR-T is available at Aetrix Electronics and suitable for industrial PLC output modules, automotive body control units, HVAC actuator interfaces, and medical device power sequencing requiring stable component supply and long-term lifecycle support.
Supply support for UDK2559LBTR-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 magnetic sensors and precision power ICs, headquartered in Worcester, Massachusetts.
The UDK2559LBTR-T belongs to Allegro's protected power driver family, engineered specifically for ruggedized industrial and automotive load switching where reliability under electrical and thermal stress is critical.
FAQ
What is the maximum continuous output current per channel for the UDK2559LBTR-T?
The UDK2559LBTR-T delivers 700 mA continuous sink current per channel under normal operating conditions. This rating assumes proper PCB thermal design - specifically, use of the fused pins (4–5 and 12–13) and adequate copper area - and remains valid across its full –40°C to +125°C ambient temperature range. Peak current is limited to approximately 1.0 A before overcurrent protection engages.
Does the UDK2559LBTR-T include internal flyback diodes for inductive load protection?
Yes, the UDK2559LBTR-T integrates clamp diodes across each output stage. These diodes conduct flyback energy during inductive load turn-off, with a forward voltage of ≤1.7 V at 1.0 A. This eliminates the need for external diodes when driving relays, solenoids, or unipolar stepper motors - a key feature confirmed in the device's Functional Block Diagram and Electrical Characteristics table.
What is the purpose of the ENABLE pin on the UDK2559LBTR-T?
The ENABLE pin (Pin 11) acts as a global enable input for all four output channels. When pulled below 0.8 V, it disables all outputs regardless of individual input states. When held at ≥2.0 V or left floating, the device operates normally using IN1–IN4. This function allows centralized power gating in systems where coordinated shutdown is required, and is explicitly defined in the Absolute Maximum Ratings and Electrical Characteristics sections.
Can the UDK2559LBTR-T drive incandescent lamps without external current-limiting resistors?
Yes, the UDK2559LBTR-T is specifically designed to drive incandescent lamps up to 700 mA steady-state current without warming or series current-limiting resistors. Its internal current-limiting circuitry restricts in-rush current to ~1.0 A during cold filament turn-on, protecting both the lamp and the IC - a capability verified in the "Circuit Description and Application" section of the official datasheet.
What is the thermal resistance (RθJA) of the UDK2559LBTR-T in its SOICW package?
The UDK2559LBTR-T has a junction-to-ambient thermal resistance (RθJA) of 90°C/W when mounted on a 1-layer PCB with copper limited to solder pads, as specified in the Thermal Characteristics table. This value reflects the SOICW (LB) package's inherent thermal limitations compared to the DIP (B) and PLCC (EB) variants, and informs minimum copper pour requirements for reliable operation at full load.
UDK2559LBTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Package/Case:
- 16-PowerSOIC (0.295", 7.50mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Switch Type:
- General Purpose
- Number of Outputs:
- 4
- Ratio - Input:Output:
- 1:1
- Output Configuration:
- Low Side
- Output Type:
- Bipolar
- Interface:
- On/Off
- Voltage - Load:
- 60V (Max)
- Voltage - Supply (Vcc/Vdd):
- 4.75V ~ 5.25V
- Current - Output (Max):
- 700mA
- Rds On (Typ):
- -
- Input Type:
- Non-Inverting
- Features:
- -
- Fault Protection:
- Current Limiting (Fixed), Over Temperature
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
UDK2559LBTR-T FAQ
1.How can I place an order for UDK2559LBTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for UDK2559LBTR-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 UDK2559LBTR-T reliable?
The price and inventory of UDK2559LBTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UDK2559LBTR-T is usually 5 days.
3.What payment methods are accepted for UDK2559LBTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UDK2559LBTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UDK2559LBTR-T?
UDK2559LBTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UDK2559LBTR-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 UDK2559LBTR-T?
For technical support, including UDK2559LBTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UDK2559LBTR-T requirements.
6.How does Aetrix verify that UDK2559LBTR-T is sourced from the original manufacturer or authorized distributors?
All UDK2559LBTR-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 UDK2559LBTR-T meets industry standards.
7.What is the process for return or replacement of UDK2559LBTR-T?
All UDK2559LBTR-T units undergo pre-shipment inspection (PSI). If there is an issue with UDK2559LBTR-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 UDK2559LBTR-T part is unused and in its original packaging.
Return procedure for UDK2559LBTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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