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ISL6843CBZ Equivalent & Substitute Parts
Part Overview
The ISL6843CBZ is a Boost/Flyback Regulator Controller IC manufactured by Renesas Electronics Corporation, designed for step-up and step-up/step-down DC-DC conversion applications. This device operates as a transistor driver with current limit and frequency control features, supporting switching frequencies up to 2MHz with a maximum duty cycle of 96%.
The ISL6843CBZ is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain compatibility across critical electrical parameters including supply voltage range, switching frequency capability, output configuration, and package form factor.
Substiute Parts
Key Parameters
| Parameter | ISL6843CBZ Value |
|---|---|
| Voltage - Supply (Vcc/Vdd) | 9V ~ 16V |
| Frequency - Switching | Up to 2MHz |
| Duty Cycle (Max) | 96% |
| Output Type | Transistor Driver |
| Function | Step-Up, Step-Up/Step-Down |
| Output Configuration | Positive, Isolation Capable |
| Topology | Boost, Flyback |
| Number of Outputs | 1 |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Mounting Type | Surface Mount |
Substitute Part Grouping Explanation
Substitute parts for the ISL6843CBZ are categorized based on the following substitution criteria:
Direct Manufacturer Variant: ISL6843IBZ maintains identical electrical specifications and topology support but differs in product status (active vs. obsolete), operating temperature range (-40°C ~ 105°C vs. 0°C ~ 70°C), and packaging format (tube vs. unspecified). This variant is pin-compatible and functionally equivalent for applications within the 0°C ~ 70°C range.
Similar Topology Controllers: UC2844AD8, UC2844AD8TR, UC3842AD8, UC3842AD8TR, UC3842AD8TRG4, UC3842D8, UC3842D8TR, UC3843AD8, and UC3843AD8TR are PWM controller ICs from Texas Instruments and Unitrode that support similar topologies (buck, boost, flyback) in the same 8-SOIC package. These parts operate with different supply voltage ranges and switching characteristics but maintain the same physical footprint and surface mount compatibility.
Substitution feasibility depends on circuit-level design accommodation of differing electrical parameters, particularly supply voltage operating ranges and input voltage specifications.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Package / Case | Voltage - Supply | Operating Temperature | Mounting Type | RoHS Status |
|---|---|---|---|---|---|---|---|
| ISL6843CBZ | Renesas Electronics | Obsolete | 8-SOIC (0.154", 3.90mm) | 9V ~ 16V | 0°C ~ 70°C | Surface Mount | ROHS3 Compliant |
| ISL6843IBZ | Renesas Electronics | Active | 8-SOIC (0.154", 3.90mm) | 9V ~ 16V | -40°C ~ 105°C | Surface Mount | ROHS3 Compliant |
| UC2844AD8 | Texas Instruments | Last Time Buy | 8-SOIC (0.154", 3.90mm) | 10V ~ 30V | -40°C ~ 85°C | Surface Mount | ROHS3 Compliant |
| UC2844AD8TR | Texas Instruments | Active | 8-SOIC (0.154", 3.90mm) | 10V ~ 30V | -40°C ~ 85°C | Surface Mount | ROHS3 Compliant |
| UC3842AD8 | Texas Instruments | Last Time Buy | 8-SOIC (0.154", 3.90mm) | 10V ~ 30V | 0°C ~ 70°C | Surface Mount | ROHS3 Compliant |
| UC3842AD8TR | Texas Instruments | Active | 8-SOIC (0.154", 3.90mm) | 10V ~ 30V | 0°C ~ 70°C | Surface Mount | ROHS3 Compliant |
| UC3842AD8TRG4 | Texas Instruments | Discontinued at DiGi Electronics | 8-SOIC (0.154", 3.90mm) | 10V ~ 30V | 0°C ~ 70°C | Surface Mount | ROHS3 Compliant |
| UC3842D8 | Unitrode | Active | 8-SOIC (0.154", 3.90mm) | Not specified | 0°C ~ 70°C | Surface Mount | Not specified |
| UC3842D8TR | Texas Instruments | Active | 8-SOIC (0.154", 3.90mm) | 12V ~ 28V | 0°C ~ 70°C | Surface Mount | ROHS3 Compliant |
| UC3843AD8 | Texas Instruments | Last Time Buy | 8-SOIC (0.154", 3.90mm) | 7.6V ~ 30V | 0°C ~ 70°C | Surface Mount | ROHS3 Compliant |
| UC3843AD8TR | Texas Instruments | Active | 8-SOIC (0.154", 3.90mm) | 7.6V ~ 30V | 0°C ~ 70°C | Surface Mount | ROHS3 Compliant |
Engineering Selection Recommendations
For Direct Replacement: ISL6843IBZ is the preferred substitute when maintaining Renesas Electronics sourcing. This part is currently active and offers extended operating temperature range (-40°C ~ 105°C), providing greater thermal margin than the obsolete ISL6843CBZ. Both parts share identical supply voltage specifications (9V ~ 16V) and package form factor, enabling direct PCB substitution.
For Multi-Source Strategy: UC3843AD8TR and UC3843AD8TR represent active alternatives from Texas Instruments with the broadest supply voltage range (7.6V ~ 30V), accommodating the ISL6843CBZ operating window while providing additional design flexibility. These parts maintain identical operating temperature range (0°C ~ 70°C) and package specifications.
For Cost Optimization: UC3842AD8TR and UC3842D8TR offer active product status with established supply chains. UC3842AD8TR operates within 10V ~ 30V supply range and maintains 0°C ~ 70°C temperature specifications. UC3842D8TR operates within 12V ~ 28V range, which encompasses the ISL6843CBZ 9V ~ 16V requirement.
Avoid: UC2844AD8, UC3842AD8, UC3843AD8, and UC3842AD8TRG4 are classified as Last Time Buy or Discontinued, limiting long-term availability for production designs.
Frequently Asked Questions (FAQ)
Q: Can ISL6843IBZ directly replace ISL6843CBZ on existing PCBs?
A: Yes. ISL6843IBZ is pin-compatible and functionally equivalent. Both parts use 8-SOIC packaging with identical pinout and electrical specifications within the 0°C ~ 70°C operating range. The primary difference is product status (active vs. obsolete) and extended temperature rating on ISL6843IBZ.
Q: What is the key difference between ISL6843 and UC3843 series controllers?
A: Both support boost and flyback topologies in 8-SOIC packages. The ISL6843 operates at 9V ~ 16V supply, while UC3843 operates at 7.6V ~ 30V. UC3843 provides broader supply voltage accommodation but requires circuit validation to confirm functional equivalence in your specific application.
Q: Are UC3842 and UC3843 interchangeable?
A: Both are PWM controllers in 8-SOIC packages with similar operating temperature ranges (0°C ~ 70°C). UC3843 supports lower minimum supply voltage (7.6V vs. 10V for UC3842) and broader topology support. Pin-level compatibility must be verified against your circuit design before substitution.
Q: Which substitute offers the best long-term availability?
A: UC3843AD8TR and UC3843AD8TR are classified as active products from Texas Instruments with established supply chains. These parts offer the broadest supply voltage range (7.6V ~ 30V) and are recommended for new designs requiring multi-year production support.
Q: Does packaging format affect substitution?
A: All listed substitutes use identical 8-SOIC (0.154", 3.90mm Width) surface mount packaging. Packaging format differences (tube, tape & reel, bulk) affect handling and storage but do not impact electrical performance or PCB compatibility.
Q: Are all substitutes RoHS3 compliant?
A: ISL6843IBZ, UC2844AD8, UC2844AD8TR, UC3842AD8, UC3842AD8TR, UC3842AD8TRG4, UC3842D8TR, UC3843AD8, and UC3843AD8TR are ROHS3 compliant. UC3842D8 does not specify RoHS status in available documentation.
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