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LH1546ADFTR
Vishay Semiconductor Opto Division
SSR RELAY SPST-NO 120MA 0-350V
2795 Pcs New Original In Stock
Solid State SPST-NO (1 Form A) 4-SMD (0.300", 7.62mm)
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5.0 / 5.0
- (122 Ratings)
LH1546ADFTR
Product Overview
1245189
DiGi Electronics Part Number
LH1546ADFTR-DGManufacturer
Vishay Semiconductor Opto Division
LH1546ADFTR
Description
SSR RELAY SPST-NO 120MA 0-350VInventory
2795 Pcs New Original In Stock
Solid State SPST-NO (1 Form A) 4-SMD (0.300", 7.62mm)
Quantity
Minimum 1
Minimum 1
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LH1546ADFTR Technical Specifications
Category
Solid State Relays
Packaging
Tape & Reel (TR)
Series
LH1546
Product Status
Active
Mounting Type
Surface Mount
Circuit
SPST-NO (1 Form A)
Output Type
AC, DC
Voltage - Input
1.2VDC
Voltage - Load
0 V ~ 350 V
Load Current
120 mA
On-State Resistance (Max)
28 Ohms
Termination Style
Gull Wing
Package / Case
4-SMD (0.300", 7.62mm)
Supplier Device Package
4-SMD
Base Product Number
LH1546
Datasheet & Documents
HTML Datasheet
LH1546ADFTR-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8536.41.0030
Additional Information
Other Names
LH1546ADFTRTR
LH1546ADFTR-DG
LH1546ADFTRCT
LH1546ADFTRDKR
Standard Package
1,000
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
Je recommande vivement DiGi Electronics pour leurs produits durables et leur service client exemplaire.
Dec 02, 2025
Received my goods in a timely manner with high-quality, secure packaging.
Dec 02, 2025
Their products consistently meet expectations without breaking the bank.
Dec 02, 2025
I appreciate their attention to detail; every device I’ve purchased feels well-crafted and reliable.
Dec 02, 2025
Super speedy delivery and affordable prices, making shopping stress-free.
Dec 02, 2025
They make high-quality electronics affordable and customer service memorable.
Dec 02, 2025
The company's logistics network covers regions efficiently.
Dec 02, 2025
We appreciate the transparency and reliability of their post-sale support.
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Frequently Asked Questions (FAQ)
When designing in the LH1546ADFTR, how can I ensure reliable turn-on drive when interfacing with low-voltage microcontrollers, especially considering potential tolerances in the 1.2VDC input threshold?
To reliably drive the LH1546ADFTR from low-voltage microcontrollers (e.g., 1.8V or 3.3V I/O), ensure the output high voltage of the MCU exceeds the maximum input threshold under all operating conditions. Since the LH1546ADFTR has a typical LED forward voltage of 1.2VDC but can require up to 1.5V under temperature extremes, use a series resistor to limit current to 5–10mA, and verify that the MCU can source this current at VOL ≤ 0.4V. In marginal cases, consider a small-signal MOSFET buffer to guarantee full LED activation and avoid partial switching that could lead to increased thermal stress or erratic output behavior.
Can the LH1546ADFTR safely switch inductive AC loads like small transformers or relays, and what protection is recommended to avoid damaging the output triac?
The LH1546ADFTR can switch inductive AC loads up to 120mA, but doing so requires external protection due to voltage spikes from back-EMF. Add an RC snubber network (e.g., 100Ω + 0.1μF rated for 250VAC) across the load, and consider a bidirectional TVS diode (e.g., P6KE150A) for overvoltage clamping. Even within the 350V load voltage limit, inductive kick can exceed breakdown ratings during zero-crossing events. Always verify with oscilloscope measurements under real load conditions to prevent premature failure.
What are the thermal derating considerations for the LH1546ADFTR when operating continuously near its 120mA load current at elevated ambient temperatures?
At full 120mA load current and 28Ω max on-state resistance, the LH1546ADFTR dissipates up to 403mW (I²R), which can significantly raise junction temperature. Since it’s a surface-mount device with no heatsink, derate the current by at least 20% above 60°C ambient and ensure adequate PCB copper (≥ 250mm² per side) for thermal dissipation. Monitor TJ via thermal simulation or IR imaging, especially in sealed enclosures, to stay below the maximum junction temperature of 125°C and maintain long-term reliability.
Is the LH1546ADFTR a suitable drop-in replacement for the Panasonic AQV252G, and what design adjustments are needed if swapping in existing designs?
The LH1546ADFTR can replace the Panasonic AQV252G in many 120mA AC/DC switching applications, but note key differences: the LH1546ADFTR has a lower input voltage sensitivity (1.2VDC vs. 1.15V typical) and higher on-state resistance (28Ω vs. ~20Ω). Check compatibility with existing drive circuits—older designs using weak drivers may fail to activate the LH1546ADFTR fully. Also verify PCB footprint compatibility; although both are 4-SMD, pitch and pad dimensions may require layout updates. Always revalidate switching performance and thermal behavior after substitution.
How does the LH1546ADFTR compare to the Toshiba TLP3558A in AC load switching applications requiring DC input control, and what are the critical trade-offs in reliability and drive requirements?
The LH1546ADFTR and TLP3558A both support AC/DC load switching with DC input, but differ in key aspects: the LH1546ADFTR has higher on-state resistance (28Ω vs. 18Ω max) but comparable input threshold (1.2VDC). The TLP3558A offers better thermal performance but in a smaller package, increasing PCB design sensitivity to heat. The LH1546ADFTR’s gull-wing leads improve solder joint reliability under thermal cycling. For designs prioritizing long-term mechanical robustness and ease of rework, the LH1546ADFTR is preferable; for minimized power loss in compact layouts, the TLP3558A may be better—evaluate with thermal models and drive capability checks.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LH1546ADFTR CAD Models
Vishay Semiconductor Opto Division LH1546ADFTR PCB symbols & footprints
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