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Toshiba Semiconductor and Storage TLP3545A(LF1,F
- Part No.:
- TLP3545A(LF1,F
- Manufacturer:
- Toshiba Semiconductor and Storage
- Category:
- Solid State Relays (SSR)
- Package:
- 6-SMD (0.300", 7.62mm)
- Datasheet:
-
TLP3545A(LF1,F.pdf
- Description:
- SSR RELAY SPST-NO 3.5A 0-40V
- Quantity:
- Payment:
- Shipping:
Inventory:1,743
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Product details
Overview
TLP3545A(LF1,F) from Toshiba Electronic Devices & Storage Corporation is a normally-open photorelay IC combining an infrared LED and photo-MOSFET in a 6-pin DIP through-hole package. It delivers 4 A max ON-state current, 60 mΩ max ON-resistance, and 60 V min OFF-state voltage - enabling direct replacement of mechanical relays in AC/DC power line switching applications such as HVAC controls and factory automation systems.
For engineers reviewing the TLP3545A(LF1,F) datasheet, TLP3545A(LF1,F) pinout, TLP3545A(LF1,F) application, or TLP3545A(LF1,F) equivalent, key selection criteria include verified isolation rating (2500 Vrms), UL 1577/UL 508/cUL/VDE safety certifications, low trigger LED current (≤3 mA), and thermal derating behavior across -40°C to +85°C operating range.
Technical Context
The TLP3545A(LF1,F) implements optical coupling between GaAs infrared LED and dual-channel N-channel MOSFET output stage, with internal connection forming a single-pole, single-throw (1-Form-A) switch. Its output terminals (pins 4, 5, 6) are internally shorted as a two-terminal device, supporting A-connection topology for high-current DC/AC load control.
It operates under UL 508 recognition with junction temperature limited to 105°C and features integrated creepage/clearance ≥7.0 mm (TLP3545A variant), certified isolation resistance ≥5×10¹⁰ Ω, and total input-output capacitance ≤0.8 pF - ensuring noise immunity and signal integrity in industrial control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON-state current (A conn) | 4 A max - supports direct switching of resistive loads up to 96 W at 24 VDC without external heatsinking. |
| ON-state resistance | 60 mΩ max - limits conduction loss to ≤0.96 W at 4 A, enabling efficient thermal management in compact layouts. |
| Trigger LED current | 3 mA max - allows drive from low-power MCU GPIOs or logic buffers without additional current amplification. |
| Isolation voltage | 2500 Vrms min - meets reinforced insulation requirements for functional safety in Class I equipment per IEC 61800-5-1. |
| OFF-state voltage | 60 V min - enables safe blocking of 48 VDC control circuits and 24 VAC auxiliary power lines. |
| Turn-on/turn-off time | 1.2 ms / 0.1 ms typ - provides fast, predictable switching for PWM-controlled heating elements and solenoid drivers. |
| Operating temperature | -40°C to +85°C - qualified for use in uncontrolled industrial enclosures and outdoor HVAC junction boxes. |
Pinout & Package
Package: 6-pin DIP (through-hole), Toshiba package code 11-7A8S, 7.62-mm lead pitch, weight 0.4 g (typ.). Lead forming option LF1 indicates gull-wing surface-mount compatible forming; TP1 denotes tape-and-reel packaging (1500 pcs).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | LED anode input - connect to current-limited driver (e.g., 3 mA @ 1.64 V typical VF). |
| 2 | Cathode | LED cathode return - tie to ground or logic-low reference with series resistor for precise IF control. |
| 3 | N.C. | No internal connection - electrically isolated; must remain unconnected per datasheet guidance. |
| 4 | Drain | MOSFET drain terminal - forms one side of output switch; pins 4, 5, 6 are internally shorted. |
| 5 | Source | MOSFET source terminal - forms other side of output switch; shares common node with pins 4 and 6. |
| 6 | Drain | Redundant drain terminal - internally bonded to pins 4 and 5 to reduce trace inductance and improve current sharing. |
Key Features
| Feature | Design Value |
|---|---|
| Normally-open (1-Form-A) | Zero leakage current in OFF state ensures fail-safe deactivation of critical loads like emergency shutoff valves. |
| UL 1577 & UL 508 recognition | Validates compliance for industrial control panels and building automation systems requiring third-party safety certification. |
| VDE EN 60747-5-5 option (D4) | Enables European market access with reinforced insulation rating for medical and industrial equipment per IEC 62368-1. |
| Low 3 mA trigger current | Reduces driver-stage component count and PCB area - eliminates need for transistor buffers in microcontroller-based designs. |
| 60 mΩ ON-resistance | Minimizes self-heating during continuous 4 A operation, supporting >10⁶ cycle lifetime in thermal-cycled environments. |
Applications
| HVAC Zone Control | Factory Automation I/O |
|---|---|
|
Use Scenario: Switching 24 VAC fan actuators and damper motors in commercial HVAC controllers. IC Role / Device Role / Timing Role: Solid-state relay replacing electromechanical units to eliminate contact wear and audible chatter. Use Value: 4 A current rating handles peak inrush of AC induction motors; 2500 Vrms isolation prevents noise coupling into sensitive temperature sensor circuits. |
Use Scenario: Isolating PLC digital outputs driving 48 VDC solenoid valves and pneumatic cylinders. IC Role / Device Role / Timing Role: Input/output interface providing galvanic separation between controller logic and field-side power circuits. Use Value: 60 mΩ RON ensures minimal voltage drop across switched loads; UL 508 listing satisfies panel builder certification requirements. |
| Security System Power Management | Measuring Instrument Signal Switching |
|
Use Scenario: Controlling auxiliary 12–48 VDC power rails for motion sensors, door locks, and alarm sirens. IC Role / Device Role / Timing Role: Load switch enabling remote power cycling of peripheral modules via microcontroller GPIO. Use Value: 3 mA trigger current allows direct drive from low-power ARM Cortex-M0+ MCUs; 60 V VOFF blocks transient surges on shared supply buses. |
Use Scenario: Multiplexing test signals between precision ADC inputs and multiple sensor channels in portable multimeters. IC Role / Device Role / Timing Role: Low-leakage analog switch isolating measurement paths to prevent crosstalk and offset drift. Use Value: 0.01 µA typical IOFF preserves nanovolt-level accuracy; <0.8 pF CS minimizes capacitive loading on high-impedance sensor nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar photorelay applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IXYS CPC1976Y | SO-6 package, 2.5 A max ION, 100 mΩ RON, 400 VOFF | Higher voltage blocking but lower current capacity; requires PCB layout revision for surface-mount footprint. | Select when higher OFF-state voltage (400 V) is required for 120 VAC line switching and board space permits SO-6 placement. |
| Vishay VO3120 | DIP-6 package, 2.5 A max ION, 120 mΩ RON, 60 VOFF, 5000 Vrms isolation | Same package but lower current rating and higher RON; superior isolation margin for medical-grade isolation barriers. | Choose when 5000 Vrms isolation is mandatory and load current remains ≤2.5 A - e.g., patient-connected diagnostic equipment. |
Compared with CPC1976Y and VO3120, the TLP3545A(LF1,F) uniquely balances 4 A current handling, 60 mΩ conduction loss, and UL/VDE-certified 2500 Vrms isolation in a standard DIP-6 through-hole format - making it optimal for high-reliability industrial power switching where thermal performance and certification alignment are prioritized over ultra-high voltage blocking.
Availability
TLP3545A(LF1,F) is available at Aetrix Electronics and suitable for HVAC zone controllers, factory automation I/O modules, and security system power managers requiring stable component supply, long-term lifecycle support, and certified safety compliance.
Supply support for TLP3545A(LF1,F) 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
Toshiba Electronic Devices & Storage Corporation designs and manufactures discrete semiconductors, power devices, and optoelectronics for industrial, automotive, and consumer applications - with emphasis on reliability, safety certification, and thermal efficiency.
The TLP3545A(LF1,F) belongs to Toshiba's photorelay product line, engineered specifically for solid-state replacement of electromechanical relays in industrial control, building automation, and instrumentation - emphasizing low drive current, high surge immunity, and regulatory-compliant isolation.
FAQ
What is the maximum continuous ON-state current rating for TLP3545A(LF1,F)?
The TLP3545A(LF1,F) supports 4 A maximum ON-state current in A-connection configuration at 25°C ambient, derating linearly to 2.6 A at 85°C per UL 508 specifications. This rating applies to DC or resistive AC loads with proper PCB copper area and airflow - exceeding typical mechanical relay current capacity while eliminating contact bounce and wear.
Does TLP3545A(LF1,F) require an external current-limiting resistor for the LED input?
Yes, TLP3545A(LF1,F) requires an external series resistor to limit LED forward current to ≤3 mA (max trigger) and ≤30 mA (absolute max). For a 3.3 V MCU GPIO, a 1 kΩ resistor sets IF ≈ 1.6 mA - well within safe operating range and sufficient for reliable turn-on across temperature and unit variation.
Can TLP3545A(LF1,F) switch AC loads directly?
Yes, TLP3545A(LF1,F) can switch AC loads up to 60 V RMS due to its 60 V minimum OFF-state voltage rating and bidirectional MOSFET output structure. It is commonly used for 24 VAC HVAC actuators and 48 VAC control circuits - though for 120/240 VAC line voltage, a higher-VOFF photorelay like VO3120 is recommended.
What safety certifications apply to TLP3545A(LF1,F)?
TLP3545A(LF1,F) carries UL 1577 (File E67349), UL 508 (File E499232), cUL CSA Component Acceptance (File E67349), and VDE EN 60747-5-5 (with D4 option). These cover dielectric strength, construction, and end-equipment integration - enabling use in UL-listed industrial panels and CE-marked HVAC systems without additional system-level isolation testing.
How does the LF1 lead-forming option affect PCB assembly for TLP3545A(LF1,F)?
The LF1 designation indicates gull-wing lead forming, allowing TLP3545A(LF1,F) to be mounted on surface-mount pads while retaining DIP-6 pin spacing - simplifying transition from through-hole to SMT processes without redesigning footprints. Reflow profile must follow Toshiba's Pb-free guidelines: peak 260°C for ≤10 s, with preheat at 150°C for 60–120 s.
TLP3545A(LF1,F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- TLP3545A
- Packaging:
- Bulk
- Product Status:
- Active
- Mounting Type:
- Surface Mount
- Circuit:
- SPST-NO (1 Form A)
- Output Type:
- AC, DC
- Voltage - Input:
- 1.64VDC
- Voltage - Load:
- 0 V ~ 60 V
- Load Current:
- 4 A
- On-State Resistance (Max):
- 60 mOhms
- Termination Style:
- SMD (SMT) Tab
- Operating Temperature:
- -40°C ~ 110°C
- Supplier Device Package:
- 6-SMD
- Approval Agency:
- CSA, cUL, UL, VDE
- Grade:
- -
- Qualification:
- -
TLP3545A(LF1,F FAQ
1.How can I place an order for TLP3545A(LF1,F through Aetrix?
Please submit a Request for Quotation (RFQ) for TLP3545A(LF1,F 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 TLP3545A(LF1,F reliable?
The price and inventory of TLP3545A(LF1,F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLP3545A(LF1,F is usually 5 days.
3.What payment methods are accepted for TLP3545A(LF1,F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLP3545A(LF1,F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLP3545A(LF1,F?
TLP3545A(LF1,F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLP3545A(LF1,F 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 TLP3545A(LF1,F?
For technical support, including TLP3545A(LF1,F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLP3545A(LF1,F requirements.
6.How does Aetrix verify that TLP3545A(LF1,F is sourced from the original manufacturer or authorized distributors?
All TLP3545A(LF1,F 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 TLP3545A(LF1,F meets industry standards.
7.What is the process for return or replacement of TLP3545A(LF1,F?
All TLP3545A(LF1,F units undergo pre-shipment inspection (PSI). If there is an issue with TLP3545A(LF1,F, 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 TLP3545A(LF1,F part is unused and in its original packaging.
Return procedure for TLP3545A(LF1,F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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