The ASGC051BS is a 5 A, 100 V Schottky barrier rectifier in a TO-277B package from Good-Ark, carrying AEC-Q101 qualification, MSL 1 moisture sensitivity, and a low-leakage profile that suits BMS and BCM control boards. This article covers the rating set, the package value, the application fit, and the qualification highlights.
ASGC051BS at a Glance
All values below come from the official Good-Ark datasheet:
| Parameter | Symbol | Value |
|---|---|---|
| Maximum repetitive peak reverse voltage | VRRM | 100 V |
| Average forward current | IF(AV) | 5 A |
| Forward voltage at 1 A / 2 A / 5 A (25 °C) | VF | 0.51 typ / 0.58 typ / 0.70 typ V (max 0.55 / 0.65 / 0.75 V) |
| Reverse leakage at 25 °C / 85 °C / 125 °C | IR | 5 µA max / 100 µA max / 5 mA max |
| Junction capacitance at 4 V, 1 MHz | Ct | 265 pF typ |
| Thermal resistance | RθJA / RθJC / RθJL | 40 / 15 / 7 °C/W |
| Qualification | — | AEC-Q101 qualified; RoHS; halogen-free; MSL 1 (J-STD-020) |
The part ships in eSGC (TO-277B) and is the one spotlight part in this portfolio with the explicit AEC-Q101 qualified wording on the datasheet—not “qualified available”—which makes the automotive claim direct rather than conditional.
The junction capacitance value matters in the switching context: 265 pF at 4 V is the charge the junction stores per volt, and at high switching dv/dt it produces displacement current that interacts with the layout. The value is small for a 5 A part, but it belongs in the same switching-node review as the recovery behavior.
TO-277B: The Compact Power Package
TO-277B is a surface-mount power package with an exposed pad that conducts heat into the PCB. For a 5 A board-level rectifier it delivers what a DPAK-style part delivers in a smaller footprint: a real thermal path through the pad and vias, and a low-profile body for dense automotive control boards. The pad design and reflow rules follow the TO-277 footprint guide; the package value here is density with a working thermal exit.
The 7 °C/W junction-to-lead and 40 °C/W junction-to-ambient figures are usable only when the board provides the copper and vias the datasheet assumes. Match the pad design to the part, and 5 A is a comfortable continuous rating; starve the pad, and the same part runs hot.
The pad and via design follow the same rules as any exposed-pad package: a copper area matching the pad, thermal vias into inner planes, and stencil apertures that control solder volume. The footprint guide covers the values; the package value here is that a 5 A automotive board can get a real thermal path without a tab or heatsink.
BMS/BCM Roles and Low-Leakage Value
Battery-management and body-control boards run on a 12 V (or higher) rail with the rectifier under continuous reverse bias in parts of the circuit. Two properties make the ASGC051BS a fit. First, the low leakage profile: 5 µA maximum at 25 °C and 100 µA at 85 °C keeps the reverse power term small on control boards where the budget is counted in milliwatts. Second, the 100 V class covers the automotive transients on the rail with margin.
The reverse-leakage reading belongs in the loss budget at the hot junction—read the datasheet curve at the working reverse voltage and temperature rather than scaling the 25 °C number—but at the 5 A class this part’s leakage stays a small term where a hotter, higher-voltage class would not.
The same low-leakage property supports reverse-polarity protection roles, where the diode sits in series with the load and its forward drop is a continuous cost. A 0.51 V typical drop at 1 A keeps that cost small, which is why the part appears in both protection and control-board roles.
Qualification Highlights: AEC-Q101, MSL1, RoHS
Three qualification facts separate the part from a commercial-grade alternative:
- AEC-Q101 qualified. The datasheet states qualified, meaning the part is documented against the automotive qualification standard, and the claim wording should be read literally—the difference between qualified and qualified available is explained in the AEC-Q101 guide.
- MSL 1. Moisture sensitivity level 1 under J-STD-020 means the part has no floor-life limit before reflow, which simplifies SMT handling in production.
- RoHS and halogen-free. The compliance statements are on the datasheet, covering the substance restrictions the automotive supply chain expects.
The qualifications are datasheet claims to confirm with the supplier before project approval, but they are present and specific, which is what the wording matters.
Sample Request and Design Support
For a design review or sample request, contact Good-Ark with your board voltage, load current, reverse bias conditions, and the pad design you intend to use. The ASGC051BS product page hosts the datasheet, and the wider Schottky rectifier diodes category shows where the part sits in the family. Samples and qualification documentation availability are confirmed directly.
Frequently Asked Questions
Is the ASGC051BS AEC-Q101 qualified?
Yes—the datasheet states AEC-Q101 qualified, the explicit wording used for this part in the spotlight portfolio. Confirm the documentation with the supplier before project approval.
What is the forward drop at the rated current?
0.70 V typical and 0.75 V maximum at 5 A and 25 °C, with lower values at lighter loads: 0.51 V typical at 1 A. Read VF at the working current and junction temperature for the loss budget.
What package is the ASGC051BS in?
eSGC (TO-277B), a surface-mount power package with an exposed pad for board-level heat conduction. The footprint and reflow rules follow the TO-277 guide.
What does MSL 1 mean?
Moisture sensitivity level 1 under J-STD-020: no floor-life limit before reflow. It simplifies SMT handling compared with higher moisture levels that require baking or time limits.
Where does the low leakage matter most?
On control boards under continuous reverse bias, where leakage power counts in milliwatts. The ASGC051BS holds 5 µA maximum at 25 °C and 100 µA at 85 °C, keeping the reverse term small.
Specifications, Applications, Ordering
Specifications:
5 A / 100 V Schottky in TO-277B; VF 0.51–0.75 V across 1–5 A; IR 5 µA max at 25 °C; AEC-Q101 qualified; MSL 1; RoHS and halogen-free.
Applications:
BMS and BCM control boards, battery protection circuits, and automotive board-level power where low leakage and compact mounting matter.
Ordering:
the datasheet is on the ASGC051BS product page; request samples and qualification documentation through Good-Ark sales with your operating conditions.