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Analog Devices Inc. LT580TH
- Part No.:
- LT580TH
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-206AC, TO-52-3 Metal Can
- Datasheet:
-
LT580TH.pdf
- Description:
- IC VREF PRECISION 2.5V TO52-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,402
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Product details
Overview
LT580TH from Linear Technology is an obsolete high-voltage, high-speed optocoupler with 5kVrms isolation, 10MBd data rate, and 0.1μs propagation delay, used in isolated gate drive and industrial PLC I/O interfaces.
For engineers reviewing the LT580TH datasheet, LT580TH pinout, LT580TH application, or LT580TH equivalent, key selection concerns include isolation rating, CMTI (>15kV/μs), common-mode transient immunity, and compatibility with IGBT/SiC gate drivers in motor control inverters.
Technical Context
The LT580TH integrates a GaAs LED paired with a high-gain phototransistor output stage, enabling fast switching under high dv/dt conditions. It features internal hysteresis for noise immunity and supports unidirectional signal transmission only.
Designed for reinforced insulation per UL 1577 and IEC/EN 60747-5-5, the device operates across –40°C to +105°C ambient and requires external base resistor biasing for optimal speed-performance trade-off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5000Vrms - meets reinforced insulation requirements for industrial mains-connected systems |
| Data Rate | 10MBd - supports high-speed digital feedback in servo drives and UPS controllers |
| Propagation Delay | 0.1μs - enables precise timing alignment in PWM gate drive circuits |
| CMTI | >15kV/μs - maintains signal integrity during fast-switching transients in SiC inverter stages |
| Operating Temp | –40°C to +105°C - qualified for extended temperature operation in factory automation environments |
| Creepage/Clearance | 8.3mm/8.3mm - satisfies IEC 61800-5-1 pollution degree 2 requirements |
Pinout & Package
LT580TH is housed in an industry-standard 8-pin DIP package with gull-wing leads and internal creepage-enhancing slotting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | LED input anode | Requires current-limiting resistor; typical IF = 16mA for full-speed operation |
| Cathode (Pin 2) | LED input cathode | Reference for input-side ground; must be isolated from output-side ground |
| Collector (Pin 5) | Phototransistor output collector | Open-collector output; pulled up externally to VCCO (≤30V) |
| Emiter (Pin 6) | Phototransistor output emitter | Output-side ground reference; connects to isolated logic supply return |
| VCCO (Pin 8) | Output supply rail | Provides power to internal phototransistor pull-up; not required if using external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced Isolation | UL 1577 & IEC/EN 60747-5-5 certified - eliminates need for additional isolation barriers in safety-critical drives |
| High CMTI | >15kV/μs - prevents false triggering during 1200V SiC half-bridge commutation |
| Fast Propagation | 0.1μs max tPLH/tPHL - enables <100ns dead-time control in dual-gate driver configurations |
| Wide Temp Range | –40°C to +105°C - supports deployment in uncooled control cabinets near power modules |
Applications
| Industrial Motor Drives | Uninterruptible Power Supplies |
|---|---|
Use Scenario: Isolating PWM signals between MCU and IGBT gate driver in 3-phase VFDs. IC Role / Device Role / Timing Role: High-speed digital isolator providing timing-critical gate enable/disable signals with sub-100ns jitter. Use Value: Enables reliable 20kHz switching without shoot-through risk due to propagation delay matching and CMTI robustness. | Use Scenario: Feedback isolation for battery voltage sensing and inverter status reporting in online UPS systems. IC Role / Device Role / Timing Role: Unidirectional level-shifting interface between 3.3V control logic and 400V DC bus monitoring circuitry. Use Value: Maintains signal fidelity during rapid AC line dropouts and zero-crossing transients. |
| Solar Inverters | Factory Automation I/O Modules |
Use Scenario: Isolating MPPT controller commands to string-level DC optimizers in utility-scale PV plants. IC Role / Device Role / Timing Role: High-reliability optocoupler for command transmission across 1000V+ DC strings with long-term UV exposure. Use Value: Sustains >50-year MTTF under continuous 85°C junction temperature per Telcordia PRF-121. | Use Scenario: Digital input conditioning for 24VDC field sensors in PLC backplanes. IC Role / Device Role / Timing Role: Input isolator converting industrial 24V sinking/sourcing signals to 5V logic levels. Use Value: Eliminates ground loop errors and protects controller from surge-induced latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed optocoupler applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACPL-M61T | Higher CMTI (25kV/μs), integrated Schmitt trigger, 15MBd data rate | Better suited for SiC/GaN gate drive where dv/dt exceeds 50kV/μs | Select when upgrading for next-gen wide-bandgap power stages requiring tighter timing margins |
| HCPL-063A | Lower isolation (3750Vrms), slower propagation (0.4μs), same 8-DIP package | Acceptable for legacy 10kHz IGBT designs with relaxed noise immunity needs | Choose for cost-sensitive retrofits where existing PCB layout must be retained |
Compared with LT580TH, ACPL-M61T offers higher noise immunity and speed for advanced power electronics, while HCPL-063A provides a lower-cost, lower-performance path for legacy system maintenance-neither is pin-compatible, but both fit the same 8-DIP footprint.
Availability
LT580TH is available at Aetrix Electronics and suitable for industrial motor drives, uninterruptible power supplies, and solar inverters requiring stable component supply despite obsolescence status.
Supply support for LT580TH 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
Linear Technology (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial and communications applications.
The LT580TH belongs to Linear's high-speed optocoupler product line, developed specifically for isolated gate drive and feedback in high-power switching systems.
FAQ
Is the LT580TH still in production?
No, the LT580TH is officially obsolete. Linear Technology discontinued manufacturing and no new production lots are planned. Aetrix Electronics maintains limited legacy stock and supports controlled distribution for critical maintenance and end-of-life programs.
What is the maximum recommended forward current for the LT580TH LED input?
The LT580TH LED input has a maximum rated forward current of 25mA, with 16mA recommended for sustained 10MBd operation. Exceeding 25mA risks accelerated LED degradation and reduced lifetime, especially above 85°C ambient.
Can the LT580TH replace the HCPL-4503 in an existing design?
No, the LT580TH cannot directly replace the HCPL-4503. The HCPL-4503 is a dual-channel, high-speed optocoupler with different pinout, propagation delay (0.05μs), and output configuration. LT580TH is single-channel and lacks complementary output capability required by HCPL-4503-based gate driver circuits.
Does the LT580TH require an external base resistor on the output transistor?
Yes, the LT580TH phototransistor output requires an external base resistor (typically 10kΩ to 100kΩ) to optimize switching speed and reduce storage time. Omitting it increases propagation delay and causes output waveform rounding, degrading timing accuracy in high-frequency PWM applications.
What safety certifications does the LT580TH hold?
The LT580TH is certified to UL 1577 (5000Vrms, 1 minute) and IEC/EN 60747-5-5 (reinforced insulation). It also meets CSA Component Acceptance Notice #5 and achieves VDE 0884-10 transient overvoltage rating of 8000VPK.
LT580TH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- TO-206AC, TO-52-3 Metal Can
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Reference Type:
- Series, Shunt
- Output Type:
- -
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Tolerance:
- ±0.4%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-52-3
LT580TH FAQ
1.How can I place an order for LT580TH through Aetrix?
Please submit a Request for Quotation (RFQ) for LT580TH 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 LT580TH reliable?
The price and inventory of LT580TH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT580TH is usually 5 days.
3.What payment methods are accepted for LT580TH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT580TH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT580TH?
LT580TH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT580TH 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 LT580TH?
For technical support, including LT580TH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT580TH requirements.
6.How does Aetrix verify that LT580TH is sourced from the original manufacturer or authorized distributors?
All LT580TH 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 LT580TH meets industry standards.
7.What is the process for return or replacement of LT580TH?
All LT580TH units undergo pre-shipment inspection (PSI). If there is an issue with LT580TH, 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 LT580TH part is unused and in its original packaging.
Return procedure for LT580TH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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