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Analog Devices Inc. LTM2894IY#PBF
- Part No.:
- LTM2894IY#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 24-BGA
- Datasheet:
-
LTM2894IY#PBF.pdf
- Description:
- DGTL ISOL 7500VRMS 2CH USB 24BGA
- Quantity:
- Payment:
- Shipping:
Inventory:343
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Product details
Overview
LTM2894IY#PBF from Analog Devices is a galvanically isolated USB 2.0 μModule transceiver supporting full-speed (12 Mbps) and low-speed (1.5 Mbps) operation with auto-speed detection, 7500 VRMS isolation, and integrated 3.3 V LDOs on both sides of the barrier. It enables robust host/hub/peripheral isolation in industrial data acquisition and medical systems where ground potential differences exceed safe limits.
For engineers reviewing the LTM2894IY#PBF datasheet, LTM2894IY#PBF pinout, LTM2894IY#PBF application, or LTM2894IY#PBF equivalent, key selection criteria include reinforced insulation rating (455 VRMS), 50 kV/µs common-mode transient immunity, ±20 kV HBM ESD protection on USB pins, and 24-ball BGA package with 17.4 mm creepage - all critical for certified medical and industrial USB isolation designs.
Technical Context
The LTM2894IY#PBF implements bidirectional USB signal isolation using coreless transformer-based µModule technology, encoding data into pulses across the barrier with built-in error checking and fail-safe shutdown. Its upstream and downstream transceivers operate independently but coordinate directionality via SOP/EOP detection and maintain consistent propagation delay (~80 ns for full speed).
It integrates automatic pull-up resistor configuration (1.5 kΩ on D1+/D1–) based on downstream bus idle state sensing, plus fixed 15 kΩ pull-downs on D2+/D2– to GND2. VLO and VLO2 provide regulated 3.3 V outputs (±10 mA max) referenced to their respective grounds, powering local logic and serving as ON/ON2 reference rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 7500 VRMS for 1 minute - meets CSA/UL/IEC reinforced insulation requirements for 2 MOPP medical applications |
| Data Rate Support | 12 Mbps full speed and 1.5 Mbps low speed - compliant with USB 2.0 physical layer timing, including rise/fall times ≤20 ns (FS) and ≤300 ns (LS) |
| Common-Mode Immunity | 50 kV/µs minimum - ensures uninterrupted communication during fast transients in motor drives or power electronics environments |
| ESD Protection | ±20 kV HBM on D1+/D1–/D2+/D2– - eliminates need for external TVS diodes on USB lines |
| VLO/VLO2 Output | 3.3 V ±0.25 V at up to 10 mA - powers isolated microcontroller I/O or level-shifting circuitry without external regulators |
| Supply Range | 4.4 V to 36 V on both VBUS and VBUS2 - supports wide-input industrial power rails and battery-backed USB ports |
| Creepage Distance | 17.4 mm - satisfies IEC 60601-1 creepage requirements for 250 VRMS working voltage in patient-connected equipment |
Pinout & Package
Package: 24-ball BGA, 22 mm × 6.25 mm × 2.06 mm, 0.6 mm ball pitch, SAC305 RoHS-compliant finish, MSL Level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D1– (A1) | Upstream USB differential negative | Connects directly to host-side D– line; includes auto-configured 1.5 kΩ pull-up when enabled |
| D1+ (A2) | Upstream USB differential positive | Connects directly to host-side D+ line; pull-up resistor matches downstream device speed |
| ON (A3) | Upstream enable control | Active-high logic input referenced to VLO/GND; resets upstream transceiver when low |
| VLO (A4) | Upstream 3.3 V LDO output | Supplies local logic and serves as ON pin reference; delivers up to 10 mA with internal 4.4 µF bypass |
| GND (A5, B1–B6) | Upstream ground reference | Primary return path for VBUS, VLO, and upstream USB signals; electrically isolated from GND2 |
| VBUS (A6) | Upstream USB bus power input | Accepts 4.4–36 V; powers upstream transceiver and VLO regulator; includes 0.3 µF internal bypass |
| GND2 (W1–W6, X5) | Downstream ground reference | Return path for VBUS2, VLO2, and downstream USB signals; galvanically isolated from GND |
| D2– (X1) | Downstream USB differential negative | Connects to peripheral-side D–; features fixed 15 kΩ pull-down to GND2 |
| D2+ (X2) | Downstream USB differential positive | Connects to peripheral-side D+; pull-down ensures proper idle state per USB specification |
| ON2 (X3) | Downstream enable control | Active-high logic input referenced to VLO2/GND2; holds downstream side in reset when low |
| VLO2 (X4) | Downstream 3.3 V LDO output | Supplies isolated peripherals or interface logic; 10 mA max, internal 4.4 µF bypass capacitance |
| VBUS2 (X6) | Downstream isolated power input | 4.4–36 V input for downstream side; powers VLO2 and D2+/D2– transceiver; 0.3 µF internal bypass |
Key Features
| Feature | Design Value |
|---|---|
| Auto-speed detection | Identifies full/low-speed downstream devices at connection time and configures upstream pull-ups accordingly - eliminates manual mode selection |
| Integrated LDOs | VLO and VLO2 deliver stable 3.3 V supplies with internal bypass capacitors - removes need for external regulators and decoupling components |
| Reinforced insulation | CSA/UL/IEC certified for 455 VRMS reinforced insulation and 2 MOPP - enables direct use in Class II medical devices without additional isolation barriers |
| Suspend mode current | Reduces VBUS supply current to ≤2.0 mA during USB suspend - maintains compliance with USB power budget constraints |
| RF/magnetic immunity | Passes EN 61000-4-3 (10 V/m, 80 MHz–1 GHz), EN 61000-4-8 (100 A/m), and EN 61000-4-9 - suitable for noisy industrial environments |
Applications
| Industrial Data Acquisition | Medical Patient Monitoring |
|---|---|
Use Scenario: Isolating USB-connected sensors in high-voltage motor control cabinets where ground potentials differ by >1 kV between PLC and sensor node. IC Role / Device Role / Timing Role: Galvanic isolator bridging host PC and isolated ADC module; preserves USB packet timing integrity while blocking ground loops. Use Value: Enables certified Class I industrial USB connectivity without external isolation components, reducing BOM count and layout complexity. | Use Scenario: Connecting bedside vital signs monitors to central nursing stations via USB while meeting IEC 60601-1 2 MOPP safety requirements. IC Role / Device Role / Timing Role: Reinforced-insulation USB transceiver providing patient-isolated data path; maintains full-speed throughput during ECG waveform streaming. Use Value: Eliminates need for optocoupler-based isolation + discrete USB PHY, achieving 2 MOPP certification in single-package solution. |
| USB Bus Splitter | Programmable Logic Controller Interface |
Use Scenario: Building a 1-to-2 isolated USB hub for connecting multiple field instruments to a single control PC in hazardous area boundary zones. IC Role / Device Role / Timing Role: Bidirectional USB repeater with automatic direction detection; handles SOP/EOP signaling and bus state refresh across isolation barrier. Use Value: Supports simultaneous full-speed transfers to two downstream devices with <80 ns added latency - within USB 2.0 hub timing budgets. | Use Scenario: Adding isolated USB firmware update capability to legacy PLCs operating in 24 V DC industrial power domains with high common-mode noise. IC Role / Device Role / Timing Role: Isolated USB endpoint enabling secure firmware loading; VBUS2 accepts 24 V input directly, eliminating external DC-DC converter. Use Value: Allows safe field updates without breaking safety ground separation, leveraging 4.4–36 V VBUS2 range and ±20 kV ESD robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated USB transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM4160BRWZ | Lower isolation rating (2500 VRMS), no integrated LDOs, requires external 3.3 V supplies on both sides | Suitable for non-medical, lower-cost industrial isolation where 2 MOPP is not required | Choose ADUM4160BRWZ only if system already provides dual 3.3 V rails and 2500 VRMS isolation suffices |
| ISOUSB211DWR | Single 5 V supply domain (no isolated VBUS2), 3750 VRMS isolation, no auto-speed detection | Applicable in host-side-only isolation where downstream side shares same ground as host | Select ISOUSB211DWR when isolating only the host port and downstream devices share host ground - not for true galvanic separation. |
Compared with ADUM4160BRWZ and ISOUSB211DWR, the LTM2894IY#PBF uniquely delivers 7500 VRMS reinforced insulation, dual independent power domains (VBUS/VBUS2), integrated 3.3 V LDOs, and automatic speed negotiation - making it the only option qualified for certified 2 MOPP medical USB interfaces requiring full galvanic separation.
Availability
LTM2894IY#PBF is available at Aetrix Electronics and suitable for industrial data acquisition, medical patient monitoring, USB bus splitters, and programmable logic controller interfaces requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for LTM2894IY#PBF 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and healthcare markets.
The LTM2894IY#PBF belongs to Analog Devices' µModule isolated interface product line, designed specifically for certified safety-critical USB isolation in medical, industrial, and energy infrastructure applications where regulatory compliance and noise immunity are mandatory.
FAQ
What is the maximum continuous working voltage supported by the LTM2894IY#PBF isolation barrier?
The LTM2894IY#PBF supports a maximum continuous working insulation voltage (VIORM) of 1414 VPEAK (1000 VRMS) across its isolation barrier. This rating is validated per IEC 60601-1 for two means of patient protection (2 MOPP) at 287.5 VRMS and aligns with CSA/UL reinforced insulation requirements. The device achieves this through 0.2 mm distance through insulation (DTI) and 17.4 mm creepage, enabling use in Class II medical equipment without additional isolation components.
Does the LTM2894IY#PBF require external pull-up or pull-down resistors on the USB data lines?
No, the LTM2894IY#PBF integrates all required USB termination resistors internally. It features auto-configurable 1.5 kΩ pull-up resistors on D1+/D1– (upstream side) that activate based on downstream device speed detection, and fixed 15 kΩ pull-down resistors on D2+/D2– (downstream side) referenced to GND2. This eliminates external resistors and ensures USB 2.0 compliance for both full-speed and low-speed enumeration without layout modifications.
How does the LTM2894IY#PBF handle USB suspend mode, and what is its impact on supply current?
When the upstream USB bus remains idle for >3 ms, the LTM2894IY#PBF enters suspend mode, reducing VBUS supply current to ≤2.0 mA (typical 1.5 mA) while maintaining VBUS2 current unchanged. Wake-up occurs within 10 µs upon disconnect/reconnect events or downstream-initiated resume signaling. During suspend, VLO continues supplying external loads but draws current from VBUS - designers must limit VLO load current to avoid exceeding USB suspend power limits.
Can the LTM2894IY#PBF be used in systems requiring IEC 60601-1 compliance for medical devices?
Yes, the LTM2894IY#PBF is certified for two means of patient protection (2 MOPP) per IEC 60601-1:2014 + A1, with reinforced insulation rated at 455 VRMS and 7500 VRMS dielectric strength. Its 17.4 mm creepage, 0.2 mm DTI, and 1414 VPEAK working voltage meet Clause 8.8.3 requirements for applied parts. When implemented per recommended PCB layout (no copper under inner pad columns), it enables direct certification of USB-connected medical peripherals without supplemental isolation.
What are the thermal limitations of the LTM2894IY#PBF at maximum ambient temperature?
The LTM2894IY#PBF has a maximum junction temperature (TJMAX) of 125°C and thermal resistance θJA = 49.6°C/W. At its rated operating temperature range (–40°C to +85°C), ambient temperature must be derated based on power dissipation: for example, at 85°C ambient and 36 V VBUS/VBUS2, total power draw (~120 mW) results in ~6°C junction rise - well within limits. Full thermal derating curves are provided in Figure G08 of the datasheet.
LTM2894IY#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-BGA
- Packaging:
- Tray
- Product Status:
- Active
- Technology:
- Magnetic Coupling
- Type:
- USB
- Isolated Power:
- No
- Number of Channels:
- 1
- Inputs - Side 1/Side 2:
- 1/1
- Channel Type:
- Bidirectional
- Voltage - Isolation:
- 7500Vrms
- Common Mode Transient Immunity (Min):
- 50kV/µs
- Data Rate:
- 12Mbps
- Propagation Delay tpLH / tpHL (Max):
- 115ns, 115ns
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- 20ns, 20ns (Max)
- Voltage - Supply:
- 4.4V ~ 36V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-BGA (22x6.25)
LTM2894IY#PBF FAQ
1.How can I place an order for LTM2894IY#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM2894IY#PBF 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 LTM2894IY#PBF reliable?
The price and inventory of LTM2894IY#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM2894IY#PBF is usually 5 days.
3.What payment methods are accepted for LTM2894IY#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM2894IY#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM2894IY#PBF?
LTM2894IY#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM2894IY#PBF 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 LTM2894IY#PBF?
For technical support, including LTM2894IY#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM2894IY#PBF requirements.
6.How does Aetrix verify that LTM2894IY#PBF is sourced from the original manufacturer or authorized distributors?
All LTM2894IY#PBF 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 LTM2894IY#PBF meets industry standards.
7.What is the process for return or replacement of LTM2894IY#PBF?
All LTM2894IY#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTM2894IY#PBF, 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 LTM2894IY#PBF part is unused and in its original packaging.
Return procedure for LTM2894IY#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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