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RT8453GSP LED Driver IC Equivalent & Substitute Parts
Part Overview
The RT8453GSP is a LED Driver IC manufactured by Richtek USA Inc., designed for step-down (buck) topology DC-DC regulation with 1.5A switch current capacity and integrated PWM/analog dimming control. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs or production continuity. The RT8453GSP operates across a 4.5V to 40V supply range and is optimized for backlight and lighting applications with an 800kHz switching frequency.
Substiute Parts
Key Parameters
| Parameter | RT8453GSP Value |
|---|---|
| Manufacturer | Richtek USA Inc. |
| Product Status | Obsolete |
| Type | DC DC Regulator |
| Topology | Step-Down (Buck) |
| Number of Outputs | 1 |
| Voltage - Supply (Min) | 4.5V |
| Voltage - Supply (Max) | 40V |
| Current - Output / Channel | 1.5A (Switch) |
| Frequency | 800kHz |
| Dimming | Analog, PWM |
| Applications | Backlight, Lighting |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) Exposed Pad |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
Substitute Part Grouping Explanation
Substitution of the RT8453GSP is determined by strict alignment of the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Topology: Step-Down (Buck) configuration
- Supply voltage range: Minimum 4.5V, Maximum ≥40V
- Output current capability: ≥1.5A switch current
- Dimming capability: Analog and/or PWM support
- Operating temperature range: -40°C to 125°C minimum
- Package compatibility: Surface mount with exposed pad preferred
Parametric Equivalent: RT8453BGSP maintains identical electrical specifications (4.5V–40V supply, 1.5A output, buck topology, analog/PWM dimming) with active product status and improved inventory availability. The primary difference is switching frequency (500kHz vs. 800kHz), which does not affect functional substitution for the specified applications.
Similar Substitutes: Parts listed below meet the core functional requirements (buck topology, 4.5V–40V supply range, 1.5A–2A output current, analog/PWM dimming) but may differ in package type, frequency, or temperature rating. Selection depends on specific application constraints.
Parameter Comparison
| Parameter | RT8453GSP | RT8453BGSP | A6214KLKTR-T | AL8860MP-13 | AP8803WTG-7 | IS31LT3353-SDLS4-TR | LM3404MRX/NOPB | LM3405XMKX/NOPB |
|---|---|---|---|---|---|---|---|---|
| Manufacturer | Richtek | Richtek | Allegro | Diodes Inc. | Diodes Inc. | Lumissil | Texas Instruments | Texas Instruments |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active |
| Topology | Buck | Buck | Buck | Buck | Buck | Buck | Buck | Buck |
| Supply Min (V) | 4.5 | 4.5 | 4.5 | 4.5 | 8 | 6 | 6 | 3 |
| Supply Max (V) | 40 | 40 | 55 | 40 | 30 | 40 | 42 | 15 |
| Output Current (A) | 1.5 | 1.5 | 2 | 1.5 | 1 | 1 | 1 | 1 |
| Frequency (kHz) | 800 | 500 | — | 1000 | 700 | 1000 | 1000 | 1600 |
| Dimming | Analog, PWM | Analog, PWM | Analog, PWM | Analog, PWM | Analog, PWM | Analog, PWM | PWM | PWM |
| Temp Range (°C) | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 105 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 |
| Package | 8-SOIC-EP | 8-SOIC-EP | 10-LSOP-EP | 8-MSOP-EP | TSOT-23-5 | SOT-89-5 | 8-PowerSOIC | TSOT-23-6 |
| RoHS Status | ROHS3 | ROHS3 | ROHS3 | ROHS3 | ROHS3 | ROHS3 | ROHS3 | ROHS3 |
Engineering Selection Recommendations
Direct Replacement (Parametric Equivalent): RT8453BGSP is the primary substitute for RT8453GSP. Both parts share identical supply voltage range (4.5V–40V), output current (1.5A), package type (8-SOIC-EP), and dimming capabilities (analog/PWM). RT8453BGSP holds active product status with significantly higher inventory availability (30,310 pcs vs. 2,313 pcs), ensuring supply chain continuity. The 500kHz switching frequency in RT8453BGSP versus 800kHz in the original part does not impact functional compatibility for backlight and lighting applications.
Alternative Substitutes Based on Application Constraints:
For designs requiring higher output current capacity, A6214KLKTR-T (Allegro MicroSystems) provides 2A switch current with extended supply range to 55V and automotive-grade qualification (AEC-Q100). Package change to 10-LSOP requires PCB layout modification.
For compact form factor requirements, AL8860MP-13 (Diodes Incorporated) delivers 1.5A in 8-MSOP package with 1MHz switching frequency. Operating temperature maximum is 105°C, which is acceptable for non-extended-temperature applications.
For lower supply voltage applications (minimum 3V), LM3405XMKX/NOPB (Texas Instruments) operates down to 3V with 1A output in TSOT-23-6 package. Supply voltage maximum is limited to 15V.
All listed substitutes maintain ROHS3 compliance and -40°C to 125°C operating temperature range (except AL8860MP-13 at 105°C maximum), ensuring regulatory and thermal compatibility with the original RT8453GSP specification.
Frequently Asked Questions (FAQ)
Q: Can RT8453BGSP be used as a direct drop-in replacement for RT8453GSP?
A: Yes. RT8453BGSP is a parametric equivalent with identical supply voltage range (4.5V–40V), output current (1.5A), package (8-SOIC-EP), and dimming modes (analog/PWM). The switching frequency difference (500kHz vs. 800kHz) does not affect functional compatibility for backlight and lighting applications. No circuit redesign is required.
Q: What is the primary reason to substitute RT8453GSP?
A: RT8453GSP is classified as obsolete. RT8453BGSP provides active product status with equivalent electrical specifications and superior inventory availability, ensuring long-term supply chain reliability.
Q: Are there substitutes with higher output current?
A: Yes. A6214KLKTR-T provides 2A switch current (versus 1.5A) with extended supply range to 55V. This part requires package change from 8-SOIC-EP to 10-LSOP-EP, necessitating PCB layout modification.
Q: Which substitute is suitable for compact designs?
A: AL8860MP-13 offers 1.5A output in 8-MSOP package (smaller than 8-SOIC) with 1MHz switching frequency. Operating temperature maximum is 105°C instead of 125°C, which is acceptable for standard industrial applications.
Q: Do all substitutes maintain RoHS compliance?
A: Yes. All listed substitutes are ROHS3 compliant, matching the original RT8453GSP specification.
Q: What is the package compatibility consideration?
A: RT8453BGSP uses identical 8-SOIC-EP package, enabling direct PCB replacement. Alternative substitutes use different packages (10-LSOP, 8-MSOP, TSOT-23-5, SOT-89-5, TSOT-23-6), requiring PCB redesign and layout modification. Package selection depends on available board space and thermal management requirements.
Q: Can substitutes with PWM-only dimming (no analog) be used?
A: Substitution depends on application requirements. LM3404MRX/NOPB and LM3405XMKX/NOPB support PWM dimming only. If the design requires analog dimming capability, these parts are not suitable. RT8453BGSP, A6214KLKTR-T, AL8860MP-13, AP8803WTG-7, and IS31LT3353-SDLS4-TR support both analog and PWM dimming.
Q: What supply voltage range is required for substitute selection?
A: The original RT8453GSP operates 4.5V–40V. Substitutes must support this range or a superset. RT8453BGSP, A6214KLKTR-T, AL8860MP-13, and IS31LT3353-SDLS4-TR meet this requirement. AP8803WTG-7 has minimum 8V supply (incompatible with 4.5V applications). LM3405XMKX/NOPB has maximum 15V supply (incompatible with 40V applications).
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