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TL3842D-8 Equivalent & Substitute Parts
Part Overview
The TL3842D-8 is a boost, flyback, and forward regulator controller IC manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device functions as a positive output step-up and step-up/step-down DC-DC controller with transistor driver output capability. The main part is currently in Last Time Buy status with 1332 pieces in stock. Due to product discontinuation and limited availability, equivalent substitute parts from alternative manufacturers and packaging formats are necessary to ensure design continuity and supply chain reliability.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | TL3842D-8 |
| Manufacturer | Texas Instruments |
| Category | Power Management (PMIC) |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Topology | Boost, Flyback, Forward |
| Function | Step-Up, Step-Up/Step-Down |
| Output Configuration | Positive |
| Voltage - Supply (Vcc/Vdd) | 10V ~ 30V |
| Frequency - Switching | Up to 500kHz |
| Duty Cycle (Max) | 97% |
| Operating Temperature | 0°C ~ 70°C (TA) |
| RoHS Status | ROHS3 Compliant |
| Product Status | Last Time Buy |
Substitute Part Grouping Explanation
Substitution eligibility for the TL3842D-8 is determined by the following critical parameters:
Mandatory Compatibility Parameters:
- Package / Case: 8-SOIC (0.154", 3.90mm Width) — pinout and footprint compatibility
- Topology: Boost, Flyback, Forward — functional circuit topology support
- Function: Step-Up, Step-Up/Step-Down — output voltage conversion capability
- Output Configuration: Positive — output polarity
- Voltage - Supply (Vcc/Vdd): 10V ~ 30V — input voltage range
- Frequency - Switching: Up to 500kHz — maximum switching frequency capability
- Duty Cycle (Max): 97% or higher — maximum duty cycle support
- Output Type: Transistor Driver — gate drive output type
Acceptable Variation Parameters:
- Operating Temperature: May extend beyond 0°C ~ 70°C range
- Packaging Format: Tube, Tape & Reel, Bulk, or Cut Tape acceptable
- Manufacturer: Alternative manufacturers acceptable if electrical specifications match
Substitute parts are grouped into three categories: Direct Manufacturer Substitutes (same base function, alternative packaging), Upgrade Parts (extended temperature range or enhanced features), and MFR Recommended Alternatives (manufacturer-endorsed replacements).
Parameter Comparison
| Parameter | TL3842D-8 | TL3842DR-8 | SG3842DM | UC2842ADM | UC2842BD1 | UC2843BD1 | UC3842BD1013TR |
|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Microchip Technology | Microchip Technology | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Packaging Format | Tube | Tape & Reel | Bulk | Bulk | Tube | Tube | Cut Tape & Digi-Reel |
| Topology | Boost, Flyback, Forward | Boost, Flyback, Forward | Flyback | Boost, Buck, Flyback, Forward | Boost, Flyback | Boost, Flyback | Boost, Flyback |
| Function | Step-Up, Step-Up/Step-Down | Step-Up, Step-Up/Step-Down | Step-Up, Step-Up/Step-Down | Step-Up, Step-Down | Step-Up, Step-Up/Step-Down | Step-Up, Step-Up/Step-Down | Step-Up, Step-Up/Step-Down |
| Output Configuration | Positive | Positive | Positive | Positive, Isolation Capable | Positive, Isolation Capable | Positive, Isolation Capable | Positive, Isolation Capable |
| Voltage - Supply (Vcc/Vdd) | 10V ~ 30V | 10V ~ 30V | 10V ~ 30V | 10V ~ 30V | 10V ~ 30V | 7.6V ~ 30V | 10V ~ 30V |
| Frequency - Switching | Up to 500kHz | Up to 500kHz | 100Hz ~ 500kHz | Up to 500kHz | Up to 500kHz | Up to 500kHz | Up to 500kHz |
| Duty Cycle (Max) | 97% | 97% | 95% | 96% | 96% | 96% | 96% |
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | -40°C ~ 85°C | -25°C ~ 85°C | -25°C ~ 85°C | 0°C ~ 70°C |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Last Time Buy | Active | Discontinued at DiGi Electronics | Active | Active | Active | Active |
| Inventory Availability | 1332 Pcs | 20690 Pcs | 3449 Pcs | 2977 Pcs | 4247 Pcs | 1885 Pcs | 5000100 Pcs |
Engineering Selection Recommendations
Primary Recommendation: TL3842DR-8
The TL3842DR-8 is the manufacturer-recommended direct substitute. It is identical to the TL3842D-8 in all electrical specifications and package type, with the only difference being the packaging format (Tape & Reel versus Tube). Product status is Active with significantly higher inventory availability (20690 pieces). This part is suitable for direct replacement in all applications where the TL3842D-8 was specified.
Secondary Recommendation: UC3842BD1013TR
The UC3842BD1013TR from STMicroelectronics provides the highest inventory availability (5000100 pieces) and maintains Active product status. Electrical specifications are identical to the TL3842D-8 across all critical parameters. The operating temperature range matches the original specification (0°C ~ 70°C). This part is suitable for applications requiring high-volume supply assurance.
Alternative Recommendation: UC2842BD1 or UC2842BD1013TR
These STMicroelectronics parts extend the operating temperature range to -25°C ~ 85°C and support isolation-capable output configuration. Both maintain the required 10V ~ 30V supply voltage range, up to 500kHz switching frequency, and 96% maximum duty cycle. These parts are suitable for applications requiring extended temperature performance or isolation capability.
Not Recommended: SG3842DM
While the SG3842DM from Microchip Technology supports the required topology and frequency range, it has been discontinued at DiGi Electronics and carries lower inventory availability. The maximum duty cycle is reduced to 95% compared to the 97% specification of the TL3842D-8. This part should be avoided for new designs.
Not Recommended: SG2843DM
The SG2843DM supports only Buck topology (Step-Down function), which does not meet the Step-Up and Step-Up/Step-Down functional requirements of the TL3842D-8. This part is not electrically compatible.
Frequently Asked Questions (FAQ)
Q: Can I use TL3842DR-8 as a direct replacement for TL3842D-8?
A: Yes. The TL3842DR-8 is electrically identical to the TL3842D-8. The only difference is packaging format: TL3842DR-8 is supplied in Tape & Reel format while TL3842D-8 is supplied in Tube format. Both use the same 8-SOIC package with identical pinout and footprint. No circuit modifications are required.
Q: What is the difference between TL3842D-8 and UC3842BD1013TR?
A: Both parts are functionally equivalent with identical electrical specifications for supply voltage (10V ~ 30V), switching frequency (up to 500kHz), and duty cycle (96-97%). The primary differences are manufacturer (Texas Instruments versus STMicroelectronics) and operating temperature range (0°C ~ 70°C for both). UC3842BD1013TR offers significantly higher inventory availability and Active product status, making it preferable for supply chain continuity.
Q: Why is SG3842DM not recommended as a substitute?
A: While SG3842DM supports Flyback topology and the required frequency range, it has been discontinued at DiGi Electronics and the maximum duty cycle is limited to 95% compared to the 97% specification of TL3842D-8. For new designs, active products with higher availability are preferred.
Q: Can UC2842BD1 replace TL3842D-8 in my application?
A: UC2842BD1 is electrically compatible with TL3842D-8 for all critical parameters: 8-SOIC package, Boost/Flyback topology, 10V ~ 30V supply voltage, and up to 500kHz switching frequency. UC2842BD1 extends the operating temperature range to -25°C ~ 85°C and adds isolation-capable output configuration. If your application operates within 0°C ~ 70°C, both parts are functionally equivalent. If extended temperature performance is required, UC2842BD1 is superior.
Q: What does "Isolation Capable" mean in the output configuration?
A: Isolation Capable indicates the controller can be used in isolated topologies such as isolated Flyback or Forward converters where the output is galvanically isolated from the input. The TL3842D-8 does not explicitly support this feature, while UC2842BD1 and UC2843BD1 do. For non-isolated applications, this difference is not relevant.
Q: Is there a substitute with better temperature performance?
A: Yes. UC2842ADM and UC2842BD1 both extend the operating temperature range to -40°C ~ 85°C and -25°C ~ 85°C respectively, compared to the TL3842D-8 specification of 0°C ~ 70°C. These parts are suitable for applications requiring operation in extended temperature environments.
Q: What is the significance of the packaging format (Tube, Tape & Reel, Bulk)?
A: Packaging format affects handling, storage, and automated assembly compatibility. Tube format is suitable for manual assembly or low-volume production. Tape & Reel format is optimized for automated pick-and-place assembly. Bulk format is used for high-volume applications. Electrically, all formats of the same part number are identical. Selection depends on manufacturing process requirements, not electrical performance.
Q: Can I use UC2843BD1 instead of TL3842D-8?
A: UC2843BD1 is electrically compatible with TL3842D-8 for topology, package, and frequency specifications. However, the minimum supply voltage is 7.6V compared to 10V for TL3842D-8, and the maximum duty cycle is 96% versus 97%. For applications operating above 10V input and not requiring the full 97% duty cycle, UC2843BD1 is a suitable substitute with extended temperature range (-25°C ~ 85°C).
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