GA47 SMD code: BAV99 dual diode datasheet, Nexperia, Vishay, onsemi, SOT-23 marking

User question

ga47 smd transistor datasheet

Artificial Intelligence Response

Direct answer to the question

• “GA47” is not a full part number. It is almost certainly an SMD top‑mark where “GA” is the device code and “47” is lot/date tracking.
• In SOT‑23 size, the most common real device behind a “GA..” mark is a BAV99 dual high‑speed switching diode, not a transistor. Obtain and use a BAV99 datasheet (Nexperia, Vishay/onsemi, Diotec) and verify electrically before substitution. (nexperia.com)
• If your part is in a larger SOT‑223 package (tabbed, 4‑terminal outline), a less common possibility is Diodes Inc. ZXTN25100DG (NPN, 100 V/3 A). Confirm by package and circuit function. (diodes.com)

Key points

• SMD marks are reused by different vendors; do not rely on the code alone.
• Identify the package and test the pin behavior (diode mode) to distinguish “dual diode” from “transistor.”

Detailed problem analysis

• Why the confusion
  • SMD packages are too small for full part numbers, so short marks are used. The suffix “47” on “GA47” is typically a lot/date code, not the device type. The same two letters can map to different parts from different vendors. (smd.yooneed.one)
• Most probable match in SOT‑23: BAV99 dual switching diode
  • BAV99 remains a ubiquitous dual series diode in SOT‑23 used for signal steering, level shifting, and clamping. Canonical datasheets show typical ratings: VRRM 70–100 V, IF(AV) ≈ 200–215 mA (per path), trr ≤ 4 ns, VF ≈ 1.0 V @ 50 mA. Vendor top‑marks vary (often “A7”), which is why a board can carry “GA..” yet still be a BAV99 from another source. (nexperia.com)
• How to confirm on the bench (power off)
  • Package check: SOT‑23 is ≈ 2.9 × 1.3 mm with a pin‑1 bevel; SOT‑223 is much larger with a back tab. (nexperia.com)
  • Diode‑mode test for BAV99 (common‑anode variant typical):
  • Expect two forward junctions from each cathode to the common anode (~0.6–0.75 V), and open circuit in reverse. A transistor would instead show two junctions sharing a base, not a common anode. Use this to positively rule in/out “dual diode.” (nexperia.com)
• Alternative interpretations to consider (why “GA” is ambiguous)
  • Zener in SOD‑323: Several code lists map “GA” to a 4.7 V zener (PZU4.7B). If your device is SOD‑323 (smaller, no bevel), it may be a zener, not a BAV99. (smd.yooneed.one)
  • Older/obsolete NPNs: Legacy codebooks list “GA” for BCX70J/BCX51 in SOT‑23; these are relatively rare today but appear in some older designs. (ro.scribd.com)
  • Power BJT in SOT‑223: If the body is SOT‑223 with a metal tab tied to the middle lead, investigate Diodes Inc. ZXTN25100DG (NPN, 100 V/3 A). Function in‑circuit (switching/drive path) should match a transistor, not a clamp. (diodes.com)

Current information and trends

• BAV99 remains in active production (including AEC‑Q101 automotive versions); typical up‑to‑date datasheets are available from Nexperia (rev. 2023) and Diotec (85–100 V variants). (nexperia.com)
• Marking diversity has increased as more suppliers manufacture equivalents; databases and vendor datasheets show differing top‑marks (e.g., “A7” for some lines), reinforcing the need for electrical verification. (digikey.co.il)
• ZXTN25100 family (SOT‑23/SOT‑89/SOT‑223) is actively sold with current PCNs (2025–2026), so if your package is SOT‑223 and the circuit role matches, a ZXTN variant is plausible. (diodes.com)

Supporting explanations and details

• Representative BAV99 electrical data (per diode, room temp; consult your chosen vendor’s datasheet for limits)
  • VRRM: 70–100 V; IF(AV): 0.2–0.215 A; trr: ≤ 4 ns; VF: ~0.855 V @ 10 mA, 1.0 V max @ 50 mA; CJ ≈ 1.5–2 pF; TJ up to 150 °C. (nexperia.com)
• Representative ZXTN25100DG data (SOT‑223 NPN)
  • VCEO 100 V; IC 3 A; hFE ≥ 300 at low currents; VCE(sat) as low as ~170–345 mV depending on current; fT ≈ 175 MHz; PD up to ~3–5.3 W package‑dependent. (diodes.com)
• Why “47” is unlikely to be the value
  • For dual diodes and small BJTs, two‑digit suffixes on the same line are commonly internal lot/date identifiers, not resistor ratios or voltages. Use package and circuit to disambiguate rather than the trailing digits. (smd.yooneed.one)

Ethical and legal aspects

• For safety‑critical/regulated products (medical, automotive), replace only with parts of equal or higher qualification (e.g., AEC‑Q101 BAV99‑AQ) and document the change. Observe ESD controls and e‑waste regulations. (diotec.com)

Practical guidelines

• Identification workflow 1) Measure the package (SOT‑23 vs SOD‑323 vs SOT‑223). 2) Trace PCB connections. 3) Perform diode‑mode checks as above. 4) If still ambiguous, lift one lead to isolate and re‑measure. 5) Compare findings to a BAV99 vs BJT signature. (nexperia.com)
• If it proves to be BAV99 (SOT‑23)
  • Suitable drop‑in choices: Nexperia BAV99 (mark often “A7”), onsemi BAV99LT1G, Diodes Inc. BAV99‑7, Diotec BAV99/BAV99‑AQ. Verify pinout and series/common‑anode variant in the datasheet before ordering. (nexperia.com)
• If it proves to be a transistor (package or measurements disagree)
  • For SOT‑223 with tab and obvious drive/switch role, check ZXTN25100DG and confirm pinout (tab and pin 2 tied). For SOT‑23 in older designs, consult codebooks for BCX70J/BCX51 and verify with curve‑tracing. (diodes.com)

Possible disclaimers or additional notes

• SMD marking databases are not authoritative and sometimes conflict; always confirm electrically and by circuit function before substituting parts. (smd.yooneed.one)

Suggestions for further research

• Pull the exact BAV99 datasheet from a preferred vendor (Nexperia, Vishay/onsemi, Diotec) and keep it as the service reference. (nexperia.com)
• If your board is using an automotive grade, consider BAV99‑AQ/AEC‑Q101 versions. (diotec.com)
• If evidence points to SOT‑223 transistor, review the ZXTN25100DG datasheet and compare pinout/voltages in‑circuit. (diodes.com)

Brief summary

• “GA47” is a top‑mark, not a part number. In SOT‑23 form it most often corresponds to a BAV99 dual switching diode, so a BAV99 datasheet is the correct reference; verify with a quick diode‑mode test. If the device is SOT‑223 or behaves like a driver/switch, investigate ZXTN25100DG (NPN). Confirm by package, pinout, and measurements before ordering replacements. (nexperia.com)

If you can share a clear photo with package size and the surrounding circuit, I can confirm which datasheet you need and suggest a safe, in‑stock replacement.

Disclaimer: The responses provided by artificial intelligence (language model) may be inaccurate and misleading. Elektroda is not responsible for the accuracy, reliability, or completeness of the presented information. All responses should be verified by the user.