Cincon CHB75-24S05 vs CHB75-48S05: Input Range, Isolation and Replacement Checks
Cincon CHB75-24S05 vs CHB75-48S05: 75W DC-DC Converter Comparison
The Cincon CHB75-24S05 and CHB75-48S05 are isolated 75W half-brick DC-DC converters with regulated 5V/15A single outputs. Both provide 1500VDC isolation and 84% typical efficiency, but they are designed for different DC input voltage ranges.
The CHB75-24S05 accepts 18–36VDC, while the CHB75-48S05 accepts 36–75VDC. For engineers selecting a replacement module, input compatibility, remote on/off logic, PCB pinout and thermal conditions are more important than matching output voltage alone.
CHB75-24S05 vs CHB75-48S05 Specifications
| Parameter | CHB75-24S05 | CHB75-48S05 |
|---|---|---|
| Manufacturer | Cincon | Cincon |
| Series | CHB75 | CHB75 |
| Nominal Input | 24VDC | 48VDC |
| Input Range | 18–36VDC | 36–75VDC |
| Output Voltage | 5VDC | 5VDC |
| Maximum Output Current | 15A | 15A |
| Output Power | 75W | 75W |
| Efficiency (Typical) | 84% | 84% |
| Isolation Voltage | 1500VDC minimum | 1500VDC minimum |
| Switching Frequency | 400kHz typical | 300kHz typical |
| UVLO Power-Up | 17V | 34V |
| UVLO Power-Down | 16V | 32.5V |
| Input Surge (100ms max.) | 50VDC max. | 100VDC max. |
| Maximum Capacitive Load | 10,000µF | 10,000µF |
| Case Temperature | −40°C to +100°C | −40°C to +100°C |
| Package | Half-Brick | Half-Brick |
Note: Specifications are based on the Cincon CHB75 series datasheet. Typical values are measured at nominal input, full load and 25°C unless otherwise stated.
24V vs 48V Input: Which Model Should You Choose?
CHB75-24S05: Choose this version for a nominal 24V DC system where the continuous input stays within 18–36VDC.
CHB75-48S05: Choose this version for a nominal 48V DC bus operating within 36–75VDC.
The two input ranges meet at 36V, but this boundary does not establish practical interchangeability. Engineers must verify startup voltage, undervoltage lockout, bus transients and available input margin.
Isolation, Remote Control and PCB Compatibility
Both modules provide at least 1500VDC isolation between input and output, input and case, and output and case. They also support remote on/off control, output trimming and continuous short-circuit protection.
The standard CHB75 models use positive remote on/off logic:
Open control connection: module ON.
Low-level control connection: module OFF.
Models with the N suffix use negative remote on/off logic.
Before replacement, check the complete ordering number, pin functions, mounting inserts, PCB footprint and cooling arrangement. The standard half-brick package measures approximately 57.9 × 61.0 × 12.7mm.
The 24V and 48V models also use different typical switching frequencies. This may affect conducted EMI and external input-filter performance.
Can CHB75-24S05 Replace CHB75-48S05?
Not as a direct electrical replacement. Both deliver 5V at up to 15A, but their allowable input ranges differ significantly.
For replacement or sourcing, verify:
Input voltage: Confirm minimum, nominal and maximum bus voltage during continuous operation.
Startup behavior: Check UVLO thresholds and expected input transients.
Control polarity: Confirm standard positive logic or N-suffix negative logic.
Mechanical compatibility: Compare PCB pinout, module dimensions and mounting requirements.
Thermal performance: Confirm the required load current is supported at the actual case temperature and airflow.
For systems requiring a broader input range, engineers may also evaluate the Cincon CHB75W series, but its input limits, efficiency and compatibility must be verified separately.
Datasheet and Related DC-DC Converters
Official manufacturer documentation:
For higher-output-power half-brick modules, see our Cincon CHB Series Half-Brick DC-DC Converter Guide.
For applications requiring extended input ranges, see How to Select a CINCON Railway DC-DC Converter. Railway-specific converters have different input, qualification and environmental requirements.
CHB75-24S05 and CHB75-48S05 Pricing & RFQ
Looking for Cincon CHB75-24S05 or CHB75-48S05 pricing, lead time or a compatible replacement?
Contact DataStorageIC with your required part number, quantity, input voltage range, remote-control logic and delivery requirements. Our team can assist with sourcing, specification verification and quotation requests.
