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Analog Devices Inc. LTM2894HY#PBF
- Part No.:
- LTM2894HY#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Isolators
- Package:
- 24-BGA
- Datasheet:
-
LTM2894HY#PBF.pdf
- Description:
- DGTL ISOL 7500VRMS 2CH USB 24BGA
- Quantity:
- Payment:
- Shipping:
Inventory:122
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Product details
Overview
LTM2894HY#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 functions as a bidirectional signal isolator for USB host/hub/peripheral interfaces in industrial and medical systems where ground potential differences exceed safe limits.
For engineers reviewing the LTM2894HY#PBF datasheet, LTM2894HY#PBF pinout, LTM2894HY#PBF application, or LTM2894HY#PBF equivalent, key selection criteria include reinforced insulation rating (2 MOPP), ±20 kV HBM ESD protection on transceiver pins, 50 kV/µs common-mode transient immunity, and dual 4.4–36 V supply range compatibility with automatic pull-up/pull-down resistor configuration.
Technical Context
The LTM2894HY#PBF implements coreless transformer-based µModule isolation to translate USB data across a reinforced dielectric barrier, maintaining bidirectional timing integrity without retiming. Its architecture includes independent upstream/downstream USB transceivers with auto-configured 1.5 kΩ pull-ups (D1+/D1–) and fixed 15 kΩ pull-downs (D2+/D2–), enabling plug-and-play bus speed negotiation.
It integrates two 3.3 V LDOs (VLO/VLO2), each rated for 10 mA output and internal 4.4 µF bypass capacitance, referenced to respective grounds (GND/GND2). The device enters suspend mode after 3 ms of bus inactivity, reducing VBUS current to ≤2.0 mA while maintaining VBUS2 current and downstream state monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 7500 VRMS for 1 minute; enables compliance with CSA/IEC 60601-1 (2 MOPP) and UL 1577 safety standards. |
| Data Rates | Full-speed: 12 Mbps; low-speed: 1.5 Mbps; meets USB 2.0 specification for non-hub passive isolation. |
| Supply Range | VBUS & VBUS2: 4.4 V to 36 V; supports wide-input industrial power rails without external regulators. |
| Common-Mode Immunity | 50 kV/µs minimum; ensures error-free communication during fast transients in motor drives or medical imaging equipment. |
| ESD Protection | ±20 kV HBM on D1+/D1–/D2+/D2– pins to local supplies and across isolation barrier; eliminates need for external TVS diodes. |
| LDO Outputs | VLO & VLO2: 3.3 V ±9.1%, 10 mA max; powers local logic and serves as reference for ON/ON2 enable inputs. |
| Propagation Delay | Full-speed: 60–115 ns; low-speed: 200–300 ns; deterministic latency suitable for real-time control loop interfacing. |
| Creepage Distance | 17.4 mm; satisfies reinforced insulation requirements for high-voltage medical and industrial applications. |
Pinout & Package
Package: 24-ball BGA (22 mm × 6.25 mm × 2.06 mm), RoHS-compliant SAC305 ball finish, MSL Level 3, rated for –40°C to +125°C operation (H-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D1– (A1) | Upstream USB Data Negative | Transmits/receives differential USB signals; internally pulled up via auto-configured 1.5 kΩ resistor during idle. |
| D1+ (A2) | Upstream USB Data Positive | Paired with D1–; forms full-speed/low-speed differential pair referenced to GND. |
| ON (A3) | Upstream Enable Control | Active-high logic input (2.0–3.3 V); referenced to VLO/GND; resets upstream transceiver when low. |
| VLO (A4) | Upstream 3.3 V LDO Output | Stable 3.3 V supply (±9.1%) delivering up to 10 mA; powers local interface logic and references ON pin. |
| 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 LDO; contains 0.3 µF internal ceramic bypass. |
| GND2 (W1–W6, X5) | Downstream Ground Reference | Isolated return path for VBUS2, VLO2, and downstream USB signals; maintains 7500 VRMS barrier integrity. |
| D2– (X1) | Downstream USB Data Negative | Internally pulled down to GND2 via 15 kΩ resistor; detects peripheral connection/disconnection state. |
| D2+ (X2) | Downstream USB Data Positive | Paired with D2–; forms differential pair for downstream side; enables auto-speed detection. |
| ON2 (X3) | Downstream Enable Control | Active-high logic input referenced to VLO2/GND2; controls downstream transceiver activation. |
| VLO2 (X4) | Downstream 3.3 V LDO Output | Independent 3.3 V supply (±9.1%), 10 mA max; powers downstream logic and references ON2 pin. |
| VBUS2 (X6) | Downstream Isolated Power Input | 4.4–36 V input powering downstream transceiver and VLO2; contains 0.3 µF internal ceramic bypass. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-speed detection | Identifies full-speed vs. low-speed downstream devices at connection time and configures upstream pull-ups accordingly-no firmware or external configuration required. |
| Integrated LDOs with bypass caps | VLO and VLO2 provide regulated 3.3 V outputs with built-in 4.4 µF ceramic capacitance, eliminating external bulk capacitors and simplifying layout. |
| Reinforced insulation certification | CSA/UL/IEC certified for 2 MOPP (287.5 VRMS) per IEC 60601-1, enabling use in patient-connected medical equipment without additional isolation barriers. |
| Suspend mode with wake-on-event | Reduces VBUS current to ≤2.0 mA during 3+ ms bus idle; wakes within 10 µs on disconnect, reconnect, or resume signaling-preserves system power budget. |
| RF/magnetic field 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 (1000 A/m) testing-suitable for noisy industrial environments. |
Applications
| Industrial Data Acquisition | Medical Patient Monitoring |
|---|---|
Use Scenario: Isolating USB interfaces between PLC-based DAQ modules and host PCs in factory-floor environments with variable ground potentials and high EMI. IC Role / Device Role / Timing Role: Bidirectional galvanic isolator preserving USB packet timing and bus state; handles >50 kV/µs transients from motor drives or welding equipment. Use Value: Eliminates ground loops and prevents measurement corruption or PC damage without requiring custom firmware or protocol translation. | Use Scenario: Connecting bedside ECG or EEG 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 isolator providing patient-isolated data path; maintains full-speed 12 Mbps throughput for real-time waveform streaming. Use Value: Achieves regulatory compliance without external isolation components or redesign of existing USB peripheral firmware. |
| Test & Measurement Equipment | Automated Test Systems |
Use Scenario: Integrating isolated USB ports into oscilloscopes or spectrum analyzers that connect to grounded PC hosts while measuring floating high-voltage circuits. IC Role / Device Role / Timing Role: Signal-level isolator transparently passing USB 2.0 packets; preserves eye diagram integrity with <2 ns full-speed jitter. Use Value: Enables safe, high-fidelity data transfer without compromising measurement accuracy or introducing timing skew in trigger synchronization. | Use Scenario: Adding isolated USB connectivity to automated test handlers used in semiconductor final test, where multiple DUTs share a common ground but require independent USB links. IC Role / Device Role / Timing Role: Multi-drop-capable USB isolator supporting hub, host, or peripheral roles; auto-detects device speed and connection state. Use Value: Reduces test floor cabling complexity and eliminates cross-talk-induced failures during parallel device testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated USB transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM4160BRIZ-RL | Lower isolation rating (2500 VRMS), no integrated LDOs, requires external 3.3 V supplies and bias resistors. | Not certified for 2 MOPP; unsuitable for patient-connected medical devices. | Select when cost sensitivity outweighs safety certification needs and board space allows external regulators. |
| ISOUSB211DWR | Single 5 V supply only (no dual 4.4–36 V range), lower common-mode immunity (25 kV/µs), no auto-speed detection. | Limited to low-noise lab environments; cannot auto-negotiate full/low speed with legacy peripherals. | Select for simple, low-cost isolation where full USB 2.0 compatibility and wide supply range are not required. |
Compared with ADUM4160BRIZ-RL and ISOUSB211DWR, the LTM2894HY#PBF delivers higher safety certification (2 MOPP), wider supply flexibility (4.4–36 V dual rail), and autonomous bus-speed adaptation-making it uniquely suited for ruggedized medical and industrial USB isolation where reliability and regulatory compliance are non-negotiable.
Availability
LTM2894HY#PBF is available at Aetrix Electronics and suitable for industrial data acquisition, medical patient monitoring, and automated test systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTM2894HY#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 industrial, automotive, communications, and healthcare markets.
The LTM2894HY#PBF belongs to Analog Devices' µModule isolated interface product line, designed specifically for robust, safety-certified USB isolation in environments with large ground potential differences and high EMI.
FAQ
What is the maximum continuous working voltage supported by the LTM2894HY#PBF isolation barrier?
The LTM2894HY#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 2 MOPP and aligns with reinforced insulation requirements in medical and industrial applications where sustained high-voltage differentials exist between upstream and downstream grounds.
Does the LTM2894HY#PBF require external pull-up or pull-down resistors on the USB data lines?
No, the LTM2894HY#PBF integrates all required termination resistors: auto-configurable 1.5 kΩ pull-ups on D1+/D1– (upstream) and fixed 15 kΩ pull-downs on D2+/D2– (downstream). These eliminate external components and enable automatic speed detection and connection-state reporting without firmware intervention-critical for plug-and-play USB isolation.
Can the LTM2894HY#PBF operate with different supply voltages on VBUS and VBUS2?
Yes, the LTM2894HY#PBF supports independent 4.4 V to 36 V supplies on VBUS (upstream) and VBUS2 (downstream). This allows asymmetric configurations-for example, 5 V on VBUS for host-side USB and 24 V on VBUS2 for an isolated industrial sensor node-without compromising isolation integrity or LDO regulation.
How does the LTM2894HY#PBF handle USB suspend mode, and what is its wake-up latency?
The LTM2894HY#PBF automatically enters suspend mode after ≥3 ms of USB bus inactivity, reducing VBUS supply current to ≤2.0 mA. It wakes within 10 µs upon detecting disconnect, reconnect, or resume signaling-ensuring rapid resumption of data transfer while minimizing system power consumption during idle periods.
Is the LTM2894HY#PBF compatible with USB 2.0 full-speed hubs or only point-to-point connections?
The LTM2894HY#PBF functions as a transparent, non-intelligent isolator-not a hub-and passes all USB 2.0 packets unmodified. It supports integration into host, hub, bus splitter, or peripheral roles per its datasheet, but does not implement hub functionality (e.g., port enumeration or transaction scheduling); it simply isolates the physical layer between two USB endpoints.
LTM2894HY#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 ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-BGA (22x6.25)
LTM2894HY#PBF FAQ
1.How can I place an order for LTM2894HY#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM2894HY#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 LTM2894HY#PBF reliable?
The price and inventory of LTM2894HY#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM2894HY#PBF is usually 5 days.
3.What payment methods are accepted for LTM2894HY#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM2894HY#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM2894HY#PBF?
LTM2894HY#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM2894HY#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 LTM2894HY#PBF?
For technical support, including LTM2894HY#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM2894HY#PBF requirements.
6.How does Aetrix verify that LTM2894HY#PBF is sourced from the original manufacturer or authorized distributors?
All LTM2894HY#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 LTM2894HY#PBF meets industry standards.
7.What is the process for return or replacement of LTM2894HY#PBF?
All LTM2894HY#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTM2894HY#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 LTM2894HY#PBF part is unused and in its original packaging.
Return procedure for LTM2894HY#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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