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IS31FL3236-TQLS2 Equivalent & Substitute Parts
Part Overview
The IS31FL3236-TQLS2 is a 36-output linear LED driver IC with I2C dimming control, manufactured by ISSI (Integrated Silicon Solution Inc). This device operates across a 2.7V to 5.5V supply range and delivers 38mA per output channel, designed for LED lighting applications requiring precise current control and digital dimming.
The IS31FL3236-TQLS2 is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for systems utilizing this LED driver architecture.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | IS31FL3236-TQLS2 |
| Manufacturer | ISSI (Integrated Silicon Solution Inc) |
| Category | Power Management (PMIC) |
| Product Status | Obsolete |
| Number of Outputs | 36 |
| Type | Linear |
| Current - Output / Channel | 38mA |
| Voltage - Supply (Min) | 2.7V |
| Voltage - Supply (Max) | 5.5V |
| Dimming | I2C |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 48-TQFP Exposed Pad |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| MSL Rating | 3 (168 Hours) |
Substitute Part Grouping Explanation
Substitution of the IS31FL3236-TQLS2 is determined by the following critical parameters:
- Number of Outputs: 36 channels (fixed requirement)
- Current per Channel: 38mA (fixed requirement)
- Supply Voltage Range: 2.7V to 5.5V (fixed requirement)
- Operating Temperature Range: -40°C to 85°C (fixed requirement)
- Type: Linear LED driver (fixed requirement)
- RoHS Compliance: ROHS3 Compliant (fixed requirement)
- MSL Rating: 3 (168 Hours) (fixed requirement)
The IS31FL3236A-QFLS2-TR qualifies as a manufacturer-recommended substitute because it maintains all critical electrical parameters (36 outputs, 38mA per channel, 2.7V–5.5V supply, -40°C to 85°C operation) and meets identical compliance standards. Package differences (48-TQFP vs. 44-QFN) and topology variations (I2C dimming vs. constant current dimming) require PCB layout and firmware evaluation during integration.
Parameter Comparison
| Parameter | IS31FL3236-TQLS2 | IS31FL3236A-QFLS2-TR |
|---|---|---|
| Manufacturer | ISSI | Lumissil Microsystems |
| Product Status | Obsolete | Active |
| Number of Outputs | 36 | 36 |
| Type | Linear | Linear |
| Topology | — | Constant Current |
| Current - Output / Channel | 38mA | 38mA |
| Voltage - Supply (Min) | 2.7V | 2.7V |
| Voltage - Supply (Max) | 5.5V | 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Package / Case | 48-TQFP Exposed Pad | 44-PowerWFQFN |
| Supplier Device Package | 48-eTQFP (7x7) | 44-QFN (5x5) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 3 (168 Hours) | 3 (168 Hours) |
Engineering Selection Recommendations
The IS31FL3236A-QFLS2-TR is designated as the manufacturer-recommended substitute for the obsolete IS31FL3236-TQLS2. Both devices maintain identical electrical specifications for output count, current delivery, and supply voltage range, ensuring functional compatibility at the circuit level.
The IS31FL3236A-QFLS2-TR carries active product status with confirmed inventory availability (11,516 pcs), providing supply chain continuity. Both parts meet ROHS3 compliance and identical MSL ratings, satisfying regulatory and manufacturing requirements.
Package transition from 48-TQFP (7x7mm) to 44-QFN (5x5mm) requires PCB layout redesign. The QFN package offers reduced footprint and improved thermal characteristics. Dimming control differences (I2C vs. constant current topology) necessitate firmware and control circuit evaluation during design integration.
Frequently Asked Questions (FAQ)
Q: Can the IS31FL3236A-QFLS2-TR directly replace the IS31FL3236-TQLS2 without PCB modification?
A: No. While electrical parameters are equivalent, the package change from 48-TQFP to 44-QFN requires PCB layout redesign. Pin assignments and thermal pad configurations differ between packages.
Q: What is the primary reason for substitution?
A: The IS31FL3236-TQLS2 is obsolete. The IS31FL3236A-QFLS2-TR is the active equivalent with confirmed manufacturer recommendation and supply availability.
Q: Are compliance certifications identical between the two parts?
A: Yes. Both parts are ROHS3 compliant, carry identical MSL ratings (3, 168 Hours), and meet REACH and EAR99 classifications.
Q: How do the dimming control methods differ?
A: The IS31FL3236-TQLS2 uses I2C dimming control. The IS31FL3236A-QFLS2-TR implements constant current dimming topology. Firmware and control circuit modifications are required for functional equivalence.
Q: What are the thermal and footprint advantages of the QFN package?
A: The 44-QFN (5x5mm) package reduces board area by approximately 49% compared to the 48-TQFP (7x7mm) and provides superior thermal dissipation through direct die-attach thermal pad contact.
Q: Are operating temperature ranges identical?
A: Yes. Both parts operate across -40°C to 85°C (TA), maintaining identical thermal specifications for industrial and commercial applications.
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