The ASMBJ28CA is a 28 V, 600 W transient voltage suppressor in an SMB (DO-214AA) package from Good-Ark, positioned on the site for automotive lighting-driver applications. The site publishes the class and the package; the full clamping parameters are confirmed with the supplier. This article covers the positioning, the 12 V system context, and the confirmation list.
ASMBJ28CA at a Glance
The site-verified information: a 28 V, 600 W TVS in SMB (DO-214AA), positioned for automotive lighting-driver lines. The 28 V stand-off class sits above the 12–14.4 V automotive rail with margin, and the 600 W class is quoted for the TVS surge-pulse convention—the exact clamping values are confirmed with the supplier.
The datasheet is not published on the site at this writing, and the full electrical parameters are the confirmation list.
The 12 V System and Where 28 V Clamps Fit
The 12 V automotive rail runs at 12–14.4 V in normal operation and faces load-dump and switching transients that reach tens of volts. The 28 V stand-off clears the normal rail with margin, and the TVS clamps the transients below the protected driver’s limit—the three-voltage selection framework in the TVS article owns the budget, and the 28 V class fits the lighting-driver lines.
The 600 W class covers the surge events the line is exposed to, with the actual pulse width and repetition rate confirmed against the datasheet’s pulse-power curve.
Unidirectional TVS for DC Lines
The automotive lighting line is a DC line with one polarity, and the unidirectional TVS is the fit: it clamps the overvoltage transient in the forward direction and blocks the normal rail, giving a lower clamping voltage for the same power class. The unidirectional choice follows the line’s polarity, and the bidirectional alternative is reserved for AC or data lines that swing both ways.
The pulse-power curve is the confirmation list’s first item: the 600 W class is quoted at a defined width, and the actual event—a switching spike or a load-dump pulse—is checked at its own width and temperature on the curve. The stand-off voltage and the clamping level are read together with the protected driver’s absolute maximum, and the leakage at the hot ambient is confirmed for the steady-state budget. The list is short, and every item changes the design decision.
What to Confirm Before Design-In
The confirmation list includes the stand-off and breakdown voltages, the clamping voltage at the rated current, the peak pulse power at the application’s pulse width, the leakage at the working temperature, and the AEC-Q101 wording. None is assumed until the supplier provides the datasheet, and the qualification status is read literally.
Sample Request
The [ASMBJ28CA product page](https://en.goodark.
The confirmation and the sample evaluation are the part’s design-in gate: the clamping parameters are read from the datasheet, the clamp is verified on the lighting driver’s line at the worst surge, and the protected driver’s margin is measured. The TVS is a small part with a large protection job, and the confirmation list and the sample test are the evidence its role is real. The 28 V class and the 600 W rating are the starting map, and the datasheet’s clamping and pulse-power curves are the contract the protection design reads.
The TVS’s place in the lighting driver is the first line of the protection chain: the clamp sits at the input, the driver’s own margin sits downstream, and the layout loop between them decides whether the datasheet’s clamp is the circuit’s clamp. The TVS selection article owns the three-voltage framework and the layout rules; the spotlight’s point is that the ASMBJ28CA is the 28 V, 600 W cell of that framework, confirmed and validated at the driver’s actual surge. The confirmation list and the sample test are the cell’s design-in evidence.
The ASMBJ28CA spotlight also sets the evaluation path: the sample runs on the lighting driver’s line, the clamp and the protected margin are measured at the worst surge, and the part’s behavior is compared with the datasheet’s pulse-power curve. The evaluation’s record—the waveform, the clamp, the margin, and the revision—is the protection design’s evidence, and the TVS’s role in the driver is proven by it.
The ASMBJ28CA spotlight also sets the evaluation path: the sample runs on the lighting driver’s line, the clamp and the protected margin are measured at the worst surge, and the part’s behavior is compared with the datasheet’s pulse-power curve. The evaluation’s record—the waveform, the clamp, the margin, and the revision—is the protection design’s evidence, and the TVS’s role in the driver is proven by it.com/proshow.php?id=1121) on the Good-Ark site is the entry, and samples and the datasheet are requested through Good-Ark sales with the application’s rail voltage, surge level, and protected-component limits.
Design note. The ASMBJ28CA information in this article is the site-verified set—28 V, 600 W, SMB (DO-214AA), and the automotive lighting-driver positioning. The full clamping parameters, pulse-power data, and qualification status are confirmed with the supplier.
Frequently Asked Questions
What does the site publish about the ASMBJ28CA?
The 28 V, 600 W class, the SMB (DO-214AA) package, and the automotive lighting-driver positioning. The full clamping parameters are confirmed with the supplier.
Why 28 V on a 12 V rail?
The 28 V stand-off clears the 12–14.4 V rail with margin, and the TVS clamps the load-dump and switching transients below the protected driver’s limit.
Why a unidirectional TVS?
The lighting line is a DC line with one polarity, so the unidirectional part clamps the overvoltage with a lower clamping voltage for the same power class.
What must I confirm before design-in?
The stand-off, breakdown, clamping, pulse-power, leakage, and AEC-Q101 wording from the supplier’s datasheet.
How do I get samples?
Through the supplier with your rail voltage, surge level, and protected-component limits.
Specifications, Applications, Ordering
Specifications:
28 V, 600 W TVS in SMB (DO-214AA); class, package, and positioning site-verified; full clamping parameters confirmed with the supplier.
Applications:
automotive lighting-driver lines and 12 V DC rails facing load-dump and switching transients.
Ordering:
the ASMBJ28CA product page and the sales team confirm the datasheet, samples, and qualification status.