BAV99 - 70V 215mA Dual Switching Diode SOT-23 | Nexperia
MPN: BAV99 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.06 | $0.06 |
| 10 | $0.045 | $0.45 |
| 100 | $0.028 | $2.80 |
| 500 | $0.02 | $10.00 |
| 1,000 | $0.015 | $15.00 |
BAV99 Overview
A switching diode is a small-signal semiconductor diode optimized for very fast transition between conducting (forward-biased) and blocking (reverse-biased) states. Within the component hierarchy, the BAV99 belongs to the family: switching diode -> small-signal diode -> diode -> discrete semiconductor. Fast reverse recovery is the defining property: ordinary rectifier diodes store charge when conducting and need microseconds to turn off, while switching diodes like the BAV99 recover in nanoseconds, which is essential for digital logic clamping, signal steering, and high-frequency rectification.
Key features of the BAV99 include the dual series-pair configuration in a single 3-pin package (saving board space versus two discrete diodes), a fast reverse recovery time of 4 ns, low forward voltage, a 350 mW power dissipation rating, and lead-free RoHS-compliant construction. Second sources from Diodes Incorporated, MCC, onsemi, Diotec, Infineon, and Nexperia make the part universally available with matched footprints.
Architecturally, the BAV99 integrates two planar-technology diodes with their junction (cathode of D1 tied to anode of D2) brought out on pin 2, so the part can be used as two series diodes, as a clamp pair, or with only one diode active. The planar process yields low capacitance and low leakage, preserving signal integrity in high-speed nodes.
Typical applications include high-speed logic clamping and protection on data lines, freewheeling and snubber functions in low-power switch-mode supplies, signal demodulation and detection in RF front ends, polarity protection in battery-powered portable equipment, and level shifting between logic domains.
When designing with the BAV99, respect the 215 mA average current limit and the 350 mW package dissipation; at higher duty cycles, derate linearly above 25 C ambient. Keep PCB traces short at the clamped node to limit parasitic inductance that degrades the effective 4 ns switching performance.
This page synthesizes distributor pricing, verified drop-in cross-references, pinout data, and practical design notes not found in any single manufacturer datasheet, making it a complete procurement and engineering reference for the BAV99. Prices shown are as of 2026-09-14.
Drop-in alternatives for BAV99 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
BAV99-7-F
β Drop-Inπ Reference alternative (not in catalog)
BAV99-TP
β Drop-Inπ Reference alternative (not in catalog)
BAV99LT1G
β Drop-Inπ Reference alternative (not in catalog)
BAV99E6327
β Drop-Inπ Reference alternative (not in catalog)
BAV99
β Drop-Inβ In Stock
$0.015 / Unit
View Datasheet βMMBD1501
β Drop-Inπ Reference alternative (not in catalog)
BAV99 Maximum Ratings & Electrical Characteristics
| Configuration | Dual series connection (2 diodes in series) |
| Diode Type | High-speed switching diode |
| Continuous Reverse Voltage (VRRM) | 70 V (100 V on several second sources) |
| Continuous Forward Current (IF) | 215 mA |
| Reverse Recovery Time (trr) | 4 ns (max) |
| Power Dissipation | 350 mW |
| Total Power Dissipation Footprint | 7 mm2 (per Fairchild datasheet) |
| Package | SOT23 (TO-236AB / SC-59 / SOT-23-3) |
| Mounting Type | Surface Mount |
| Technology | Planar |
| RoHS Status | Compliant |
| Automotive Variant | BAV99Q (AEC-Q101 qualified, PPAP capable, IATF 16949 facilities) |
BAV99 Pin Configuration
| Pin 1 | A1 β Anode of diode D1 |
| Pin 2 | K1/A2 β Common junction: cathode of D1 connected to anode of D2 |
| Pin 3 | K2 β Cathode of diode D2 |
Typical Applications
BAV99 is suitable for 6 applications: Logic Line Clamping and Protection, Switch-Mode Power Supply Snubbers and Freewheeling, RF Detection and Signal Demodulation, Polarity Protection in Battery-Powered Portable Devices, Industrial Control Input Protection, Automotive Body Electronics and ECU Signal Conditioning.
Logic Line Clamping and Protection
The BAV99 is the canonical clamp diode for protecting digital and analog signal lines. Its 4 ns reverse recovery time means the diode stops conducting almost instantly when a transient ends, preventing signal distortion on fast edges, and its 70-100 V reverse rating comfortably absorbs ESD-ring and inductive kick events well above logic levels. In a typical clamp, pin 1 ties to the rail and pin 3 to the signal node (or the pair used in series for window clamps), with pin 2 as the midpoint. Because the two diodes are matched and thermally coupled on one die pair, clamp thresholds track over temperature. Keep the series trace to the protected node under 10 mm to preserve the effective nanosecond response.
Recommended
Switch-Mode Power Supply Snubbers and Freewheeling
In low-power flyback, buck, and boost converters, the BAV99 serves as a freewheeling or snubber diode where output current stays below its 215 mA continuous rating. The 4 ns trr is the critical parameter: in a snubber network across a switching MOSFET, a slow diode would conduct during the entire switching transition and dissipate power, while the BAV99 recovers in nanoseconds, keeping snubber loss minimal at hundreds of kHz. The 350 mW dissipation limit bounds usable duty; at 100 mA average and roughly 1 V forward drop, dissipation is only about 100 mW, leaving margin. Place the diode directly across the winding or switch pins to minimize loop inductance.
Recommended
RF Detection and Signal Demodulation
The BAV99's planar construction gives low junction capacitance and 4 ns recovery, making it suitable for envelope detection and small-signal rectification in RF and IF stages up to the low hundreds of MHz. In a series detector configuration, the diode in the BAV99 rectifies the modulated carrier while its low capacitance avoids loading the tuned circuit. Because the package contains two series diodes, designers can implement a voltage-doubling detector using one SOT-23 footprint instead of two parts. Signal levels must stay in the small-signal region (the diode needs roughly 0.6-0.7 V forward bias to conduct appreciably), so it suits AM detection and level sensing rather than microwatt logarithmic detection.
Recommended
Polarity Protection in Battery-Powered Portable Devices
The BAV99 provides reverse-polarity and reverse-current blocking in battery-powered consumer and IoT hardware. A series diode drop of about 0.7 V at 215 mA costs only about 150 mW of loss, which is acceptable in 5 V and higher rails, while the 70-100 V reverse rating gives large safety margin against wrong-battery or charger-fault events. The dual series arrangement also supports an OR-ing configuration with a companion part. Its tiny SOT-23 footprint (about 7 mm2 of board area) suits wearables and handheld products where every square millimeter counts, and multi-source availability eliminates single-supplier risk for consumer BOMs.
Recommended
Industrial Control Input Protection
PLC digital input cards and industrial sensor interfaces use the BAV99 to clamp inductive kick from long field wiring and relay coils. The 70-100 V reverse voltage rating handles 24 V industrial rail transients with wide margin, and the 215 mA rating covers the input optocoupler LED current with ample headroom. Its 4 ns recovery ensures the clamp re-engages instantly for repeated transient events such as contact bounce on mechanical relays. The Diodes Incorporated BAV99Q variant adds AEC-Q101 qualification, PPAP capability, and IATF 16949 manufacturing for transportation-adjacent industrial programs requiring traceable qualification data without changing the SOT-23 footprint.
Recommended
Automotive Body Electronics and ECU Signal Conditioning
In automotive ECUs, the BAV99 (specified as the AEC-Q101 qualified BAV99Q) clamps sensor lines, switch inputs, and actuator drive nodes exposed to load-dump-adjacent transients. Its 100 V-class reverse rating and 215 mA capability suit 12 V vehicle electrical systems with transient headroom, while 4 ns recovery keeps clamp action effective on fast inductive spikes from solenoids and motors. Diodes Incorporated states the BAV99Q is AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities, satisfying OEM quality-flow requirements. The SOT-23 footprint is identical to the standard part, enabling reuse of qualified layouts across consumer and automotive product lines.
Recommended
Recommended Products Summary
Engineering reference data for BAV99 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BAV99-7-F | BAV99-TP | BAV99LT1G | BAV99E6327 | MMBD1501 |
|---|---|---|---|---|---|---|
| Package | SOT-23 (TO-236AB) | SOT-23 (TO-236AB) - same | SOT-23 (TO-236AB) - same | SOT-23 (TO-236AB) - same | SOT-23 (TO-236AB) - same | SOT-23 (TO-236AB) - same |
| Brand | Nexperia | Diodes Incorporated | MCC (Micro Commercial Components) | onsemi | Infineon | onsemi |
| Configuration | Dual series (2 diodes in series) | Dual series - same | Dual series - same | Dual series - same | Dual series - same | Dual series - same |
Key Differentiators
- Fastest recovery in the commodity dual-diode class (vs BAV99LT1G)
- Universal multi-source availability (vs MMBD1501)
- Automotive-qualified drop-in variant (vs BAV99-TP)
Design Notes
The reverse voltage rating of the BAV99 varies by manufacturer: Nexperia specifies 70 V while Diodes Incorporated, MCC, onsemi, and some other sources specify 100 V, and Diotec specifies 75 V. When qualifying a second source, check the VRRM of the actual supplier rather than assuming the generic 100 V value often quoted in cross-reference tables. Circuits designed with only 70 V margin should reject 70 V-rated sources for transients above that level.
Place the BAV99 within a few millimeters of the node it clamps or the switch it snubs. At 4 ns recovery, even 10 nH of trace inductance produces a visible L-di/dt ring and degrades the effective clamp response. Use short, wide traces to the clamped node and return path; a solid ground pour under the SOT-23 reduces loop area. Standard SOT-23 land pattern (about 2.9 x 2.4 mm outline) suits automated placement per the Nexperia small SMD package design intent.
Estimated: the SOT-23 package theta_JA is typically around 300 C/W on minimum copper; at the full 350 mW rating this yields roughly a 105 C junction rise, so continuous operation at 350 mW in a 50 C ambient approaches the usual 150 C junction limit. Derate dissipation linearly above 25 C ambient, and increase copper pour area under pins 1-3 for high-duty-cycle clamp applications to keep junction temperature well below the maximum rating.
Compliance Information
RoHS compliant per distributor listings (DigiKey BAV99-TP, Diotec BAV99). The Diodes Incorporated BAV99Q variant is AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities per the Diodes BAV99 datasheet. AEC-Q101 is the relevant automotive standard for discrete diodes; marked not_applicable pending confirmation of Q-grade for this exact ordering code.
