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LH1529FPTR
Vishay Semiconductor Opto Division
SSR RELAY SPST-NO 120MA 0-350V
2262 Pcs New Original In Stock
Solid State SPST-NO (1 Form A) 8-SOP (0.180", 4.57mm Width)
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5.0 / 5.0
- (287 Ratings)
LH1529FPTR
Product Overview
2111546
DiGi Electronics Part Number
LH1529FPTR-DGManufacturer
Vishay Semiconductor Opto Division
LH1529FPTR
Description
SSR RELAY SPST-NO 120MA 0-350VInventory
2262 Pcs New Original In Stock
Solid State SPST-NO (1 Form A) 8-SOP (0.180", 4.57mm Width)
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
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LH1529FPTR Technical Specifications
Category
Solid State Relays
Packaging
-
Series
LH1529
Product Status
Obsolete
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)
20 Ohms
Termination Style
Gull Wing
Package / Case
8-SOP (0.180", 4.57mm Width)
Supplier Device Package
8-SMD
Base Product Number
LH1529
Datasheet & Documents
HTML Datasheet
LH1529FPTR-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
Standard Package
1,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
每次購買的物流效率都令人驚訝，補貨速度極快。
Dec 02, 2025
DiGi Electronics的客戶支援非常專業，處理問題迅速有效。
Dec 02, 2025
每次聯絡售後都能快速得到回應，服務品質非常值得讚賞。
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Frequently Asked Questions (FAQ)
Can I use the LH1529FPTR as a drop-in replacement for the obsolete LH1520 in a 24VAC signal switching application, and what design-in risks should I evaluate?
The LH1529FPTR can serve as a functional upgrade path from the LH1520 due to shared 8-SMD packaging and SPST-NO topology, but key differences require validation. While both support AC/DC loads up to 350V, the LH1529FPTR has a lower max load current (120mA vs. 150mA in earlier variants) and tighter on-state resistance control (20Ω max). In a 24VAC application, verify load compatibility considering the higher I²R heating at 120mA. Also confirm drive compatibility—LH1529FPTR requires only 1.2VDC input, enabling direct microcontroller drive, but ensure your PCB layout isolates control and load grounds to prevent leakage-induced false triggering. Thermal performance under continuous load must be checked, especially in confined enclosures.
What are the reliability concerns when using the LH1529FPTR in industrial environments with load voltages near 300VAC?
When operating the LH1529FPTR near its 350V load limit (e.g., 300VAC RMS), transient overvoltage events are a primary failure risk. Although the relay is rated for 350V, repeated exposure to voltage spikes from inductive kickback or line surges can degrade internal semiconductor junctions over time. To ensure reliability, always pair the LH1529FPTR with external protection: a metal oxide varistor (MOV) across the output and, if switching inductive loads, a snubber circuit (RC network). Also consider derating—operate below 80% of rated voltage (i.e., <280V) for enhanced lifetime. Monitor ambient temperature, as high temps reduce dielectric strength and accelerate wear-out mechanisms.
How does the 20 Ohm on-state resistance of the LH1529FPTR impact thermal design in high-cycle switching applications?
The 20Ω max on-state resistance in the LH1529FPTR results in up to 288mW of power dissipation at full 120mA load (P = I²R), which can cause notable temperature rise in surface-mount 8-SOP packages without adequate copper heatsinking. In high-cycle or continuous-duty applications, this self-heating can accelerate junction degradation and lead to premature failure. To mitigate thermal stress, design PCB pads with at least 200mm² of copper pour connected to the drain tabs (if applicable) and use thermal vias to inner ground planes. Avoid placing near other heat-generating components and verify thermal performance under worst-case ambient conditions (e.g., 70°C).
What are the key differences between the LH1529FPTR and similar SSRs like the Toshiba TLP222G in mixed AC/DC load applications?
While both the LH1529FPTR and Toshiba TLP222G are SMD-mount optically isolated SPST-NO SSRs, the LH1529FPTR supports a wider load voltage range (0–350V AC/DC) compared to the TLP222G’s 100V max, making LH1529FPTR better suited for universal line-voltage applications. However, the TLP222G offers a lower on-state resistance (~15Ω) and higher current rating (150mA), giving it an edge in low-voltage, high-efficiency designs. A critical design trade-off: the LH1529FPTR’s 1.2V input enables TTL compatibility without level shifting, while TLP222G typically needs ~1.8V. For designs targeting global deployment with mixed load types, the LH1529FPTR provides greater flexibility, but its obsolete status demands careful inventory planning.
Given the LH1529FPTR is marked as obsolete, what are the recommended mitigation strategies for long-term production design-in or component replacement?
With the LH1529FPTR listed as obsolete, long-term production requires proactive risk mitigation. First, secure a final stocking purchase from authorized channels while 2200 units are still available to buffer short-term needs. For new designs, consider redesigning with active SSRs like the Broadcom ACPL-K370 or Toshiba TLP241A, which offer similar SMD-8 packaging and AC/DC switching but with better availability. If pin compatibility is essential, evaluate the Vishay VO1263A, though its 1.5V input threshold may require driver adjustments. Always simulate replacement parts in your load environment to confirm turn-on/turn-off times and leakage current behavior, as mismatches can disrupt timing-sensitive circuits.
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.
LH1529FPTR CAD Models
Vishay Semiconductor Opto Division LH1529FPTR PCB symbols & footprints
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