MBRS3200T3G Equivalent, Alternative & Replacement Guide — 200V/3A Schottky SMB | ICMASS

MBRS3200T3G vs NRVBS3200NT3G vs SK3200B-LTP vs BR320: Full Comparison

When to Use Each Alternative

NRVBS3200NT3G - Automotive, Same Silicon

Best for: PPAP-tracked automotive programs. Same die as MBRS3200T3G with full AEC-Q101 and PPAP documentation. The standard part's datasheet shows it was AEC-Q101 tested, but only the NRVB variant provides the formal paperwork your Tier-1 will require. No electrical differences, no layout changes.

SK3200B-LTP (MCC) - Best Cross-Manufacturer Match

Best for: Second-sourcing when onsemi lead times are long. MCC's SK3200B-LTP matches: 200V, 3A, SMB. V_F 860mV (vs 840mV), leakage 500µA (vs 1mA). Narrower temp range (-55/+150°C) and lower surge (80A vs 100A). For commercial designs these differences are irrelevant. For under-hood, verify against max ambient.

BR320_R1_00001 (Panjit) - Lowest Leakage

Best for: High-temperature reverse blocking. At 50µA, Panjit BR320 leaks 20× less than MBRS3200T3G at 25°C. As temperature rises, this gap widens exponentially. Above 85°C ambient while blocking >100V, the BR320's low baseline leakage provides critical thermal margin. Trade-off: V_F 900mV vs 840mV, about 180mW more at 3A.

SK320B (Taiwan Semiconductor) - Low Leakage, Higher V_F

Best for: Leakage-sensitive designs on a budget. The SK320B offers 100µA leakage — 10× better than MBRS3200T3G — at the cost of 950mV V_F. Temp range: -55°C to +150°C. If your design spends most of its time in reverse blocking (OR-ing, battery protection), the leakage improvement outweighs the V_F penalty.

When NOT to Use Any of These

Your rail voltage exceeds 150V DC. All of these are 200V Schottkys. Above 150V DC with transients and ringing, you're too close to the limit. Step up to a 400–600V ultrafast like the MURS340T3G or MURS360BT3G.

Ambient temperature exceeds 100°C at high reverse voltage. Even the BR320's 50µA leakage hits 5–10mA at 125°C. At 200V that's 1–2W of leakage power. For sustained high-temp blocking, switch to an ultrafast diode with microamp-range leakage.

You're rectifying line-voltage AC (110–230V). Schottkys don't have the voltage rating. Use a 600V ultrafast (MURS360BT3G) or a SiC Schottky for the CCM PFC boost position.

Frequently Asked Questions

Q1: Can I replace an obsolete S320 with MBRS3200T3G directly?

A: Yes, and it's an upgrade. The S320 was the older onsemi 200V/3A Schottky. The MBRS3200T3G is the direct active replacement with the same SMB footprint and improved V_F (840mV vs 900mV). No PCB changes, no BOM adjustments beyond the part number. The NRVBS3200NT3G is the automotive-qualified version of the same replacement.

Q2: Which alternative has the best high-temperature performance?

A: BR320_R1_00001 (Panjit). At 50µA room-temperature leakage vs 1mA for the MBRS3200T3G, the BR320 starts from a 20× lower leakage baseline. At 125°C where Schottky leakage is 50–100× the 25°C value, the Panjit's lower starting point translates to dramatically less leakage power. The BR320 also matches the onsemi parts' full -65°C to +175°C temperature range.

Q3: Are all four parts truly drop-in compatible?

A: Electrically and mechanically yes, but watch the temp range. All four use the identical SMB (DO-214AA) footprint with the same pinout (cathode marked by polarity band). The MCC SK3200B-LTP and Taiwan Semi SK320B have a narrower temperature range (-55°C to +150°C). If your design reaches 150–175°C junction temperature, stick with onsemi or Panjit.

Q4: Can I use a standard 40V Schottky in place of a 200V one?

A: Absolutely not. Several automated cross-reference tools incorrectly suggest SS32, SB320, or B320-13-F as MBRS3200T3G equivalents. These are 20–40V parts. Installing one on a 48V or 200V rail results in immediate avalanche breakdown and a short-circuited diode. Always verify the voltage rating on the datasheet, never trust automated cross-reference tools for high-voltage substitutions.

Q5: What if I need more than 3A but still want SMB?

A: You're at the limit of the SMB package. The SMB's thermal resistance limits practical current to about 3A without exotic PCB cooling. For 4–5A at 200V, you have two options: use two MBRS3200T3G in parallel (Schottkys naturally current-share thanks to positive V_F tempco), or move to a larger package. The MURS360BT3G (600V/3A ultrafast) is rated 3A. For true >3A SMD Schottky at 200V, you may need to go to a DPAK (TO-252) packaged part.

Q6: Which alternative should I stock if I can only pick one backup?

A: SK3200B-LTP (MCC). It's the closest cross-manufacturer match on all critical parameters (200V, 3A, 860mV V_F, SMB), is widely available, and costs roughly the same as the onsemi part. If your design is automotive, stock NRVBS3200NT3G instead. If your design runs hot (T_A > 85°C) while blocking high reverse voltage, stock BR320 for its leakage advantage.

Related Products

• MBRS3200T3G — onsemi 200V/3A Schottky, 840mV V_F, SMB
• NRVBS3200NT3G — Automotive variant, AEC-Q101 + PPAP
• MURS360BT3G — 600V/3A Ultrafast alternative for high-voltage rails
• MURA110T3G — 100V/1A Ultrafast for low-voltage positions
• MBRS3100T3G — 100V/3A Schottky, lower V_F for 12–24V rails