Component Comparison: LM2596S-5.0/NOPB vs CLB40I1200PZ-TRL
Quick verdict
For low-to-mid power DC-DC step-down regulation up to 3A and 40V input, the LM2596S-5.0/NOPB is a practical, integrated buck converter solution with minimal external components and straightforward implementation. Conversely, the CLB40I1200PZ-TRL is a high-power SCR thyristor discrete device designed for switching large currents (up to 40A) at high voltages (up to 1300V), making it suitable only for very different use cases such as industrial power control or AC phase control, not for DC-DC regulation.
Spec comparison table
| Spec | LM2596S-5.0/NOPB | CLB40I1200PZ-TRL | Notes |
|---|---|---|---|
| Function | Step-Down Buck Regulator IC | SCR Thyristor Discrete | Different categories: integrated regulator vs discrete thyristor; not interchangeable. |
| Input Voltage Max | 40 V | 1300 V | CLB40I1200PZ-TRL supports much higher voltage, suitable for high-voltage circuits. |
| Input Voltage Min | 4.5 V | 18.3 V | LM2596S supports low-voltage inputs, better for low-voltage DC-DC applications. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface mount but different package types. |
| Number of Outputs | 1 | 1 | Both single output devices but fundamentally different functions. |
| Operating Temperature Range | -40°C to 125°C (TJ) | -40°C to 125°C (typ) | Comparable operating temperature ranges. |
| Output Configuration | Positive | N/A | Not applicable for SCR discrete device. |
| Output Current Max | 3 A | 40 A | CLB40I1200PZ-TRL supports much higher current, but for different application. |
| Output Type | Fixed 5V | N/A | LM2596S outputs fixed regulated voltage; SCR is a switch, no regulated output voltage. |
| Output Voltage Max/Min | 5 V fixed | N/A | LM2596S fixed 5V output; SCR not for voltage regulation. |
| Package Case | TO-263-6, D2PAK (5 Leads + Tab) | TO-263D2 | Different package variants; footprint likely different. |
| Supplier Device Package | TO-263 (DDPAK-5) | TO-263D2 | Not pin-compatible; different package pinouts and functions. |
| Switching Frequency Typ | 150 kHz | 50 Hz max | LM2596S designed for high-frequency switching; SCR is line-frequency device. |
| Synchronous Rectifier | No | N/A | LM2596S uses diode rectification; SCR has no synchronous rectifier function. |
| Topology | Buck | Thyristor (SCR) | Fundamentally different device types and topologies. |
| Reverse Current Typ | N/A | 10 µA | SCR off-state leakage current; LM2596S not specified here. |
| Forward Voltage Drop Typ (40A) | N/A | 1.30 V | SCR conduction loss relevant at high currents; LM2596S internal losses not directly comparable. |
| Forward Voltage Drop Typ (80A) | N/A | 1.59 V | Same as above; SCR designed for very high currents. |
| Forward Voltage Drop Typ @125°C (40A) | N/A | 1.26 V | Slightly lower voltage drop at elevated temperature for SCR. |
| Forward Voltage Drop Typ @125°C (80A) | N/A | 1.64 V | Increased conduction losses at high current and temperature. |
| Forward Current Max | 3 A | 40 A | SCR supports much higher current. |
| RMS Forward Current Typ | N/A | 63 A | High RMS current capability for SCR. |
| Threshold Voltage Max @150°C | N/A | 0.85 V | Relevant to SCR gate triggering; no equivalent in LM2596S. |
| Slope Resistance Typ | N/A | 9.9 mΩ | Important for conduction losses in SCR; not applicable for LM2596S. |
| Thermal Resistance Junction-Case Typ | N/A | 0.4 K/W | SCR package thermal conductivity data; LM2596S datasheet does not specify explicitly. |
| Thermal Resistance Case-Heatsink Typ | N/A | 0.25 K/W | SCR thermal management parameter. |
| Total Power Dissipation Max @25°C | N/A | 310 W | High power dissipation capability of SCR; LM2596S limited by IC dissipation and package. |
| Forward Surge Current Typ (50Hz, 10ms) | N/A | 520 A | SCR can handle large surge currents briefly; LM2596S cannot. |
| Gate Trigger Voltage Typ | N/A | 1.7 V | SCR gate triggering characteristic; no gate trigger in LM2596S. |
| Gate Trigger Current Typ | N/A | 30 mA | SCR gate current requirement; LM2596S has no external gate control. |
| Gate Non-Trigger Voltage Typ | N/A | 2/3 V | SCR gate leakage characteristic. |
| Gate Non-Trigger Current Min | N/A | 1 mA | SCR gate leakage current. |
| Latching Current Typ | N/A | 100 mA | SCR must exceed latching current to remain on. |
| Holding Current Typ | N/A | 70 mA | SCR must maintain above holding current to stay on. |
| Turn Off Time Typ | N/A | 150 µs | SCR turn-off delay; LM2596S switching frequency is much higher. |
| RMS Current Min | N/A | 35 A | SCR minimum RMS current rating. |
| Virtual Junction Temperature Min | -40°C | -40°C | Similar minimum operating temperature. |
| Virtual Junction Temperature Typ | 125°C | 150°C | SCR device can tolerate higher junction temperature. |
| Operation Temperature Min | -40°C | -40°C | Both devices support industrial temperature range. |
| Operation Temperature Typ | 125°C | 125°C | Typical max operating temperature. |
| Storage Temperature Min | -40°C | -40°C | Comparable storage temperature ratings. |
| Storage Temperature Typ | 150°C | 150°C | Comparable storage temperature ratings. |
| Weight Min | N/A | 1.5 g | SCR is a discrete power device with measurable weight. |
| Mounting Force With Clip Min | N/A | 20 N | SCR requires mechanical mounting force for heatsink; LM2596S usually PCB mounted. |
| Dimension A (min/typ) | N/A | 4.06 / 4.83 mm | SCR physical dimensions; LM2596S datasheet does not provide dimensions here. |
| Dimension B (min/typ) | N/A | 0.51 / 0.99 mm | SCR pin dimension details. |
| Dimension C (min/typ) | N/A | 0.40 / 0.74 mm | SCR pin dimension details. |
| Input Voltage Typ | N/A | 80 V | SCR typical blocking voltage. |
| Switching Frequency Max | 150 kHz | 50 Hz | LM2596S designed for high-frequency PWM; SCR is line-frequency device. |
| Diode Forward Voltage Min | N/A | 1.78 V | SCR internal diode characteristic. |
| Diode Forward Voltage Typ | N/A | 3 V | SCR internal diode voltage drop. |
| Diode Forward Current Max | N/A | 10 A | SCR internal diode current rating. |
| Junction Temperature Min | N/A | -25°C | SCR junction temperature minimum rating. |
| Junction Temperature Typ | N/A | 45°C | SCR typical junction temperature. |
| Junction Temperature Max | N/A | 150°C | Max junction temperature for SCR. |
| Thermal Impedance Min | N/A | 0.07 K/W | SCR thermal impedance minimum. |
| Thermal Impedance Typ | N/A | 2.54 K/W | SCR thermal impedance typical. |
| Thermal Impedance Max | N/A | 10.92 K/W | SCR thermal impedance maximum. |
| Gate Voltage Min | N/A | 0 V | SCR gate driving voltage range. |
| Gate Current Typ | N/A | 10 mA | SCR gate current typical value. |