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IR21844 Half-Bridge Gate Driver IC Equivalent & Substitute Parts
Part Overview
The IR21844 is a half-bridge gate driver IC designed for driving IGBT and N-Channel MOSFET configurations in power management applications. This non-inverting driver operates with a supply voltage range of 10V to 20V and supports a maximum bootstrap voltage of 600V, making it suitable for high-voltage switching applications.
The IR21844 is classified as obsolete, which necessitates identification of active equivalent parts for new designs and ongoing production requirements. The IR21844PBF serves as the direct active substitute, maintaining identical electrical and mechanical specifications while offering current production availability.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Driven Configuration | Half-Bridge |
| Channel Type | Synchronous |
| Number of Drivers | 2 |
| Gate Type | IGBT, N-Channel MOSFET |
| Voltage - Supply | 10V ~ 20V |
| Logic Voltage - VIL, VIH | 0.8V, 2.7V |
| Current - Peak Output (Source, Sink) | 1.9A, 2.3A |
| Input Type | Non-Inverting |
| High Side Voltage - Max (Bootstrap) | 600V |
| Rise / Fall Time (Typ) | 40ns, 20ns |
| Operating Temperature | -40°C ~ 150°C (TJ) |
| Package / Case | 14-DIP (0.300", 7.62mm) |
| Mounting Type | Through Hole |
Substitute Part Grouping Explanation
Substitution of the IR21844 is determined by strict equivalence across all electrical and mechanical parameters. The substitute part must maintain:
- Identical driven configuration (half-bridge topology)
- Matching channel type (synchronous operation)
- Equal number of driver channels (2 channels)
- Compatible gate drive capability (IGBT and N-Channel MOSFET support)
- Identical supply voltage range (10V ~ 20V)
- Matching logic voltage thresholds (VIL 0.8V, VIH 2.7V)
- Equal peak output current specifications (1.9A source, 2.3A sink)
- Non-inverting input configuration
- Identical bootstrap voltage rating (600V maximum)
- Matching propagation delay characteristics (40ns rise, 20ns fall)
- Compatible temperature operating range (-40°C ~ 150°C)
- Identical package form factor (14-DIP through-hole)
The IR21844PBF meets all these criteria and qualifies as a direct substitute.
Parameter Comparison
| Parameter | IR21844 | IR21844PBF |
|---|---|---|
| Manufacturer | Infineon Technologies | International Rectifier |
| Product Status | Obsolete | Active |
| Driven Configuration | Half-Bridge | Half-Bridge |
| Channel Type | Synchronous | Synchronous |
| Number of Drivers | 2 | 2 |
| Gate Type | IGBT, N-Channel MOSFET | IGBT, N-Channel MOSFET |
| Voltage - Supply | 10V ~ 20V | 10V ~ 20V |
| Logic Voltage - VIL, VIH | 0.8V, 2.7V | 0.8V, 2.7V |
| Current - Peak Output (Source, Sink) | 1.9A, 2.3A | 1.9A, 2.3A |
| Input Type | Non-Inverting | Non-Inverting |
| High Side Voltage - Max (Bootstrap) | 600V | 600V |
| Rise / Fall Time (Typ) | 40ns, 20ns | 40ns, 20ns |
| Operating Temperature | -40°C ~ 150°C (TJ) | -40°C ~ 150°C (TJ) |
| Package / Case | 14-DIP (0.300", 7.62mm) | 14-DIP (0.300", 7.62mm) |
| Mounting Type | Through Hole | Through Hole |
| ECCN | EAR99 | EAR99 |
| HTSUS | 8542.39.0001 | 8542.39.0001 |
Engineering Selection Recommendations
The IR21844PBF is the appropriate selection for applications currently using the obsolete IR21844. Both parts are classified under identical export control categories (ECCN EAR99) and harmonized tariff codes (HTSUS 8542.39.0001), ensuring regulatory compliance equivalence.
The IR21844PBF maintains active production status with substantial inventory availability (24,894 units), whereas the IR21844 is obsolete with limited remaining stock (1,586 units). For new designs and production continuity, the IR21844PBF is the recommended choice.
Both parts are RoHS non-compliant and REACH unaffected, maintaining identical environmental compliance profiles. The through-hole 14-DIP package format ensures direct PCB layout compatibility without redesign requirements.
Frequently Asked Questions (FAQ)
Q: Can the IR21844PBF be used as a direct replacement for the IR21844 in existing designs?
A: Yes. The IR21844PBF is electrically and mechanically identical to the IR21844 across all specified parameters. The 14-DIP through-hole package format permits direct socket substitution without PCB modifications.
Q: What is the primary reason for substituting the IR21844?
A: The IR21844 is classified as obsolete. The IR21844PBF provides an active production equivalent with identical specifications and superior availability.
Q: Are there any compliance differences between the IR21844 and IR21844PBF?
A: No. Both parts share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications. Both are RoHS non-compliant and REACH unaffected.
Q: What are the critical electrical parameters that define substitution eligibility?
A: Substitution requires matching supply voltage range (10V ~ 20V), logic voltage thresholds (VIL 0.8V, VIH 2.7V), peak output current (1.9A source, 2.3A sink), bootstrap voltage rating (600V), and propagation delay characteristics (40ns rise, 20ns fall).
Q: Does the package form factor affect substitution compatibility?
A: No. Both the IR21844 and IR21844PBF use identical 14-DIP (0.300", 7.62mm) through-hole packaging, ensuring direct PCB compatibility without layout modifications.
Q: What is the operating temperature range for both parts?
A: Both the IR21844 and IR21844PBF operate across -40°C to 150°C junction temperature, supporting identical thermal specifications for system design.
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