The CCLHM150 BK from Central Semiconductor Corp is a two-terminal constant current regulator designed to deliver a fixed 18mA output current across a supply range up to 50V. Built in the compact SOD-80 (DO-213AC, MINI-MELF) surface mount package, this device functions as a current-limiting diode equivalent, maintaining stable current flow independent of voltage fluctuations within its operating window.
Operating across a junction temperature range of -65°C to 200°C, the CCLHM150 BK suits applications requiring consistent LED drive currents, sensor biasing, or reference current generation in space-constrained layouts. The SOD-80 form factor measures approximately 3.5mm in length with a 1.6mm diameter, enabling placement in high-density PCB assemblies where board real estate is limited. Surface mount construction supports automated pick-and-place workflows and reflow soldering profiles common in volume production.
The 18mA regulation current makes this device compatible with standard indicator LEDs, low-power signal conditioning circuits, and voltage reference networks where a fixed bias current is needed without external resistor calculations. The 50V input voltage ceiling accommodates automotive 12V/24V systems, industrial control panels, and battery-powered equipment with headroom for transient overvoltage events. Two-terminal operation eliminates the need for feedback loops or external components, simplifying circuit topology and reducing component count.
As an obsolete part, the CCLHM150 BK is no longer in active production, though existing inventory remains available for legacy design support, field service replacements, and equipment repair scenarios. Engineers maintaining existing platforms or fulfilling end-of-life purchase orders should evaluate pin-compatible alternatives with similar regulation current and voltage ratings to secure long-term supply continuity. The base product number CCLHM150 may assist in cross-referencing equivalent devices from other suppliers or identifying drop-in substitutes within the Central Semiconductor portfolio.
Current regulator diodes of this type offer predictable thermal performance and inherent short-circuit protection, as the device self-limits current even under load fault conditions. The wide junction temperature tolerance supports operation in harsh environments including automotive under-hood applications, industrial process control, and outdoor lighting systems where ambient temperature swings are significant. The MINI-MELF package provides mechanical robustness and thermal coupling to the PCB, aiding heat dissipation in continuous-duty applications.
Replacing Central Semiconductor Corp CCLHM150 BK Current Regulator Without Losing Circuit Compatibility
Central Semiconductor Corp CCLHM150 BK is an obsolete SOD-80 current regulator device rated for an 18 mA output current and up to 50 V input voltage. Replacement searches usually begin when an existing design depends on this MINI-MELF / DO-213AC footprint, a fixed current-regulation behavior, or a wide junction-temperature range that cannot be changed without revalidating the circuit.
Suitable equivalent or alternative part numbers to evaluate include Central Semiconductor Corp CCLHM150 TR, Central Semiconductor Corp CCLM150 BK, Semitec E-183, Semitec
S-183T
, onsemi
S-183T
Semitec USA Corp
CURRENT REGULATOR DIODES 50V 18M
11826
NSI45020AT1G
, and onsemi
NSI45020AT1G
onsemi
IC CURRENT REGULATOR 10% SOD123
2000000
NSI45015WT1G
. These parts are not all drop-in replacements. Some are closer electrically, while others require PCB, thermal, or performance review. The selection process should focus on current setpoint tolerance, voltage compliance, package geometry, polarity, derating, temperature behavior, and qualification requirements rather than only matching the nominal 18 mA value.
NSI45015WT1G
onsemi
IC CURRENT REGULATOR 20% SOD123
90418
What the Central Semiconductor Corp CCLHM150 BK Does in a Power Management Design
The CCLHM150 BK is a two-terminal current regulator supplied in a SOD-80 / DO-213AC / MINI-MELF surface-mount package. Its primary function is to provide an approximately constant 18 mA current over the usable voltage range, with a maximum input voltage rating of 50 V. The device is specified for a broad junction-temperature range of -65°C to 200°C, which makes its high-temperature behavior one of the defining characteristics when selecting a replacement.
| Specification / Feature | Central Semiconductor Corp CCLHM150 BK | Replacement Impact |
|---|---|---|
| Function | Fixed current regulator | Alternatives should provide two-terminal current limiting unless the circuit can accept an active regulator redesign |
| Nominal output current | 18 mA | Closest substitutes should be near 18 mA; 15 mA or 20 mA parts may shift LED brightness, bias current, or sensor excitation level |
| Voltage rating | 50 V input | Replacement voltage compliance must exceed the maximum circuit voltage plus transients and derating margin |
| Package | DO-213AC, MINI-MELF, SOD-80 | Mechanical compatibility is strongest with SOD-80 parts;
SOD-123
MMSD4148
200000
|
| Mounting type | Surface mount | Through-hole or axial CRDs are usually not direct assembly replacements |
| Operating temperature | -65°C to 200°C TJ | Lower-temperature alternatives may be unsuitable for downhole, aerospace, engine-adjacent, or industrial high-temperature use |
| Product status | Obsolete | Availability and lifecycle risk should be considered along with electrical fit |
In real circuits, the CCLHM150 BK may be used for LED current regulation, bias networks, battery-powered current sources, sensor excitation, charging or trickle-current functions, and current-limited protection paths. Its replacement must therefore be evaluated in context. For example, a 20 mA regulator may be acceptable in an indicator LED circuit but unsuitable for a precision bias branch. A lower-voltage 45 V CCR may work in a 24 V system but should be reviewed carefully in a 48 V rail or surge-prone environment.
Candidate Equivalent and Alternative Parts for CCLHM150 BK Replacement Evaluation
The following table compares practical replacement candidates for Central Semiconductor Corp CCLHM150 BK. The strongest candidates are those that maintain the fixed-current function with minimal circuit changes, but the final choice depends on the application’s electrical headroom, board layout, thermal environment, and sourcing constraints.
| Manufacturer | Part Number | Key Specifications | Product Features | Typical Applications | Why It Can Replace the Original Part | Main Differences or Limitations | Recommended Usage |
|---|---|---|---|---|---|---|---|
| Central Semiconductor Corp | CCLHM150 TR | Current regulator, nominal 18 mA class, 50 V class, SOD-80 / MINI-MELF | Same product family as CCLHM150 BK, surface-mount current regulator | Existing CCLHM150 BK boards, LED current limiting, bias current sources | Closest practical replacement when only packaging or reel format differs | Availability may be limited because the base product is obsolete; verify suffix, packaging, and date code | Preferred first option for form-fit-function replacement when stock is available |
| Central Semiconductor Corp | CCLM150 BK | Current regulator, SOD-80 / MINI-MELF package, similar current-regulator family | Two-terminal current limiting device in a mechanically similar package | Legacy current-regulator designs requiring MINI-MELF assembly | May preserve PCB footprint and assembly process better than non-SOD-80 alternatives | Temperature rating and exact current tolerance must be checked against CCLHM150 BK; may not match the high-temperature version | Use when SOD-80 compatibility is needed and the operating temperature is within the verified rating |
| Semitec | E-183 | Current-regulating diode, nominal 18 mA class, typically axial leaded | Simple two-terminal CRD behavior, close nominal current match | LED drive, constant-current biasing, analog sensor circuits | Electrically attractive where an 18 mA CRD is required | Axial package is not a direct SOD-80 replacement; board or assembly modification is likely | Good for redesigns, prototypes, or assemblies where through-hole / lead forming is acceptable |
| Semitec |
S-183T
Semitec USA Corp
CURRENT REGULATOR DIODES 50V 18M
11826
| Surface-mount current-regulating diode, nominal 18 mA class | SMD CRD alternative with current close to CCLHM150 BK | Compact LED current regulation, bias circuits, low-component-count current sources | Offers similar two-terminal fixed-current behavior in an SMD format | Package dimensions, voltage rating, temperature range, and land pattern may differ from SOD-80 | Consider for PCB revisions where an SMD 18 mA CRD is preferred but exact MINI-MELF footprint is not mandatory |
| onsemi |
NSI45020AT1G
onsemi
IC CURRENT REGULATOR 10% SOD123
2000000
| Constant current regulator, nominal 20 mA, 45 V class,
SOD-123
MMSD4148
200000
| Integrated two-terminal CCR, automotive-oriented availability in many designs | LED strings, automotive indicators, current-limited loads | Functional alternative when 20 mA is acceptable and voltage margin is sufficient | Output current is higher than 18 mA; 45 V rating is below the CCLHM150 BK 50 V rating; package differs | Suitable for LED or non-precision current paths after brightness, power, and voltage derating review |
| onsemi |
NSI45015WT1G
onsemi
IC CURRENT REGULATOR 20% SOD123
90418
| Constant current regulator, nominal 15 mA, 45 V class, compact SMD package | Lower-current CCR option with simple two-terminal operation | LED indicators, low-current biasing, portable equipment | Can replace the function where reducing current from 18 mA to 15 mA is acceptable | Lower current may reduce LED brightness or bias level; 45 V rating and package differ | Use when lower current reduces power dissipation or extends LED life without affecting system function |
Among these candidates, Central Semiconductor Corp CCLHM150 TR is generally the closest option if the only issue is sourcing the CCLHM150 BK suffix. Central Semiconductor Corp CCLM150 BK is more attractive mechanically than many cross-manufacturer parts but needs datasheet confirmation for temperature and current behavior. Semitec E-183 and Semitec
S-183T
are useful when the design goal is to preserve an 18 mA current-regulating diode function. onsemi
S-183T
Semitec USA Corp
CURRENT REGULATOR DIODES 50V 18M
11826
NSI45020AT1G
and onsemi
NSI45020AT1G
onsemi
IC CURRENT REGULATOR 10% SOD123
2000000
NSI45015WT1G
are stronger choices when supply continuity, modern CCR availability, or LED-current regulation matters more than exact current matching.
NSI45015WT1G
onsemi
IC CURRENT REGULATOR 20% SOD123
90418
Engineering Trade-Offs When Comparing CCLHM150 BK Replacement Options
Replacement decisions should be based on how each candidate behaves inside the original circuit. Current accuracy, voltage headroom, temperature derating, solder footprint, and qualification status can affect the final result more than the nominal current value alone.
| Decision Factor | CCLHM150 TR | CCLM150 BK | Semitec E-183 | Semitec S-183T | onsemi NSI45020AT1G | onsemi NSI45015WT1G |
|---|---|---|---|---|---|---|
| Electrical compatibility | Closest match to CCLHM150 BK if same base device | Potentially close, but verify high-temperature and current tolerance | Close nominal 18 mA behavior | Close nominal 18 mA behavior | Higher 20 mA current; 45 V rating needs review | Lower 15 mA current; 45 V rating needs review |
| Mechanical compatibility | Strong if supplied in SOD-80 / MINI-MELF | Strong if SOD-80 version is confirmed | Weak for existing SMD MINI-MELF pads | Moderate only if PCB can support its SMD footprint | Requires
SOD-123
MMSD4148
200000
| Requires compact SMD footprint change |
| Performance difference | Minimal expected if same electrical grade | Depends on whether it matches the high-temperature CCLHM version | Similar current class but package parasitics and thermal path differ | Similar current class with SMD assembly benefits | More current may increase LED brightness and power dissipation | Less current may reduce brightness or bias margin |
| Reliability considerations | Best for existing qualified designs if authentic stock is available | Good candidate after datasheet and lot verification | Leaded construction can be robust but may not suit automated SMD flow | Suitable for updated SMD designs after qualification | Broadly available CCR family; review thermal rise at 20 mA | Lower dissipation than 20 mA option, but current shift must be acceptable |
| Package availability | Dependent on obsolete inventory | Dependent on Central Semiconductor supply | Often easier for redesign than direct replacement | Useful for PCB revisions | Common modern SMD package family | Common modern SMD package family |
| Cost and sourcing impact | May carry obsolete-part pricing | May be easier than exact CCLHM150 BK depending on stock | May reduce sourcing risk in redesigned assemblies | May support ongoing production if approved | Often favorable for LED applications | Often favorable where lower current is allowed |
| Best-fit scenarios | Repair, maintenance, or production continuation without PCB change | MINI-MELF designs that do not require the full CCLHM temperature profile | Redesigns needing an 18 mA CRD and accepting axial format | SMD redesigns needing near-18 mA regulation | LED current regulation where 20 mA is acceptable | Power-sensitive or brightness-reduced designs |
| Main limitation | Obsolescence risk remains | Not automatically equivalent to high-temperature CCLHM150 BK | Not a drop-in SMD replacement | Footprint and rating confirmation required | Current and voltage rating differ from original | Current is below original and may alter circuit behavior |
For a direct replacement strategy, start with Central Semiconductor Corp CCLHM150 TR and then evaluate Central Semiconductor Corp CCLM150 BK if the operating temperature and current regulation curves match the original design requirements. For redesigns that must preserve the 18 mA current level, Semitec E-183 and Semitec
S-183T
are practical alternatives, with the package decision driving the final choice. For LED-oriented or less precision-sensitive circuits, onsemi
S-183T
Semitec USA Corp
CURRENT REGULATOR DIODES 50V 18M
11826
NSI45020AT1G
and onsemi
NSI45020AT1G
onsemi
IC CURRENT REGULATOR 10% SOD123
2000000
NSI45015WT1G
may be acceptable functional replacements, but the 20 mA or 15 mA current shift should be tested at minimum and maximum operating voltage and temperature.
NSI45015WT1G
onsemi
IC CURRENT REGULATOR 20% SOD123
90418
Before purchasing CCLHM150 BK equivalents or alternative current regulator parts, obtain quotations and availability confirmation through IC-Components.com or contact Info@IC-Components.com.
