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Nexperia USA Inc. BAT721A-QR
- Part No.:
- BAT721A-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BAT721A-QR.pdf
- Description:
- DIODE ARR SCHOTTKY 40V TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,687
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Product details
Overview
BAT721A-QR from Nexperia is a 40 V, 200 mA dual Schottky barrier diode in SOT23 package with common anode configuration, integrated guard ring for stress protection, and AEC-Q101 qualification for automotive power rail clamping and reverse polarity protection circuits.
For engineers reviewing the BAT721A-QR datasheet, BAT721A-QR pinout, BAT721A-QR application, or BAT721A-QR equivalent, this device delivers low forward voltage (550 mV at 200 mA), low capacitance (40–50 pF), and thermal robustness up to 125 °C junction temperature in space-constrained automotive ECUs and infotainment systems.
Technical Context
This dual Schottky diode integrates two independent junctions sharing a common anode terminal (Pin 3), enabling compact dual-path protection or clamping without discrete pairing. Its planar structure with guard ring enhances ESD and transient stress resilience beyond standard Schottky designs.
The device operates within −65 °C to 150 °C ambient range, supports pulsed forward currents up to 1 A (non-repetitive), and exhibits thermally sensitive reverse leakage-rising from 15 µA at 25 °C to 3 mA at 100 °C under 30 V bias-requiring thermal-aware layout in high-temperature zones.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Reverse Voltage | 40 V - defines maximum allowable blocking voltage before breakdown in clamping or reverse protection roles |
| Forward Current (DC) | 200 mA - continuous conduction limit per diode; sets trace width and thermal pad requirements on PCB |
| Forward Voltage | 550 mV @ 200 mA - enables low-loss rectification and minimizes voltage drop in 3.3 V/5 V rail protection |
| Reverse Leakage | 15 µA @ 30 V, 25 °C - critical for low-power standby circuits; increases significantly above 85 °C |
| Diode Capacitance | 40–50 pF @ 0 V, 1 MHz - determines high-frequency response in line termination and EMI filtering applications |
| Junction Temperature | 125 °C - maximum operational junction temperature; requires thermal resistance ≤500 K/W in FR4 layout |
| AEC-Q101 Qualified | Yes - validated for automotive use including temperature cycling, HTRB, and ESD testing per AEC standard |
Pinout & Package
Encapsulated in SOT23 (TO-236AB) plastic SMD package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch, tin-plated terminations compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | K1 (Cathode, Diode 1) | Output node for first Schottky path; connects to protected load or signal line |
| 2 | K2 (Cathode, Diode 2) | Output node for second independent Schottky path; enables dual-rail or redundancy schemes |
| 3 | A1,A2 (Common Anode) | Shared input node; ties both diodes to positive supply or reference voltage rail |
Key Features
| Feature | Design Value |
|---|---|
| Low Forward Voltage | 550 mV at 200 mA reduces conduction loss and self-heating in always-on automotive modules |
| Low Junction Capacitance | 40–50 pF enables effective RF decoupling and high-speed signal line termination up to ~100 MHz |
| Integrated Guard Ring | Improves ruggedness against ESD and voltage transients without external protection components |
| AEC-Q101 Qualification | Validated for automotive underhood and cabin environments including thermal cycling and humidity exposure |
| Common-Anode Dual Configuration | Reduces component count vs. two discrete diodes; simplifies layout for dual-rail reverse polarity protection |
Applications
| Automotive Power Rail Protection | High-Speed Signal Line Termination |
|---|---|
|
Use Scenario: Protecting 12 V battery-connected ECUs from reverse battery connection and load dump transients. IC Role / Device Role / Timing Role: Dual Schottky clamp with common anode tied to battery rail; cathodes routed to protected subsystem inputs. Use Value: Prevents damage during jump-start miswiring while maintaining <550 mV drop during normal operation. |
Use Scenario: Terminating RS-485 or CAN FD data lines to suppress reflections and reduce EMI. IC Role / Device Role / Timing Role: Low-capacitance Schottky pair used as active termination with controlled forward conduction. Use Value: 40–50 pF capacitance and fast switching support clean edge integrity up to 5 Mbps signaling. |
| Ultra-High-Speed Switching | Voltage Clamping in DC-DC Converters |
|
Use Scenario: OR-ing diodes in redundant 5 V power supplies for ADAS domain controllers. IC Role / Device Role / Timing Role: Dual-path forward conduction path with shared anode; selects higher-voltage supply automatically. Use Value: 200 mA rating and 550 mV VF enable efficient power combining without thermal derating at 85 °C. |
Use Scenario: Clamp output overvoltage spikes in buck converter feedback loops or synchronous rectifier nodes. IC Role / Device Role / Timing Role: Fast-turn-on Schottky shunt that conducts only during transient excursions above set threshold. Use Value: Sub-100 ns response and low VF minimize energy dissipation during short-duration overvoltage events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSR20F40NXT5G | Same SOT23 package; 40 V VR, 200 mA IF, but VF = 520 mV @ 200 mA; no AEC-Q101 claim in datasheet | Qualified for industrial/commercial use only; not validated for automotive temperature cycling or HTRB | Select when AEC-Q101 is not required and lower VF margin is prioritized |
| Vishay VS-2EDH04-M3/84A | SOD-323 package (smaller footprint); 40 V VR, 200 mA IF, VF = 570 mV @ 200 mA; AEC-Q101 qualified | Higher thermal resistance (~600 K/W) limits power handling in dense layouts; smaller solder land area | Select when board space is constrained and thermal budget allows higher Rth(j-a) |
Compared with NSR20F40NXT5G and VS-2EDH04-M3/84A, BAT721A-QR uniquely combines AEC-Q101 qualification, SOT23 manufacturability, and 550 mV VF at full rated current-making it optimal for production automotive modules where reliability and process compatibility are jointly critical.
Availability
BAT721A-QR is available at Aetrix Electronics and suitable for automotive power management, high-speed interface termination, and reverse polarity protection requiring stable component supply across multi-year vehicle production cycles.
Supply support for BAT721A-QR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Nexperia is a global semiconductor expert focused on high-volume, high-reliability essential semiconductors for automotive, industrial, and consumer markets.
BAT721A-QR belongs to Nexperia's AEC-Q101-qualified Schottky diode portfolio, engineered specifically for robust, low-loss protection and clamping in automotive electrical systems.
FAQ
Is BAT721A-QR suitable for reverse polarity protection in 24 V commercial vehicle systems?
No. BAT721A-QR has a maximum reverse voltage rating of 40 V, which provides adequate margin for 12 V automotive systems (with typical load dump peaks ≤40 V), but does not meet the 60+ V transient requirements of 24 V commercial vehicles. Use a 60 V or higher-rated dual Schottky such as PDS340Q for those applications.
Can BAT721A-QR be used in place of two separate BAT54S diodes?
Yes, BAT721A-QR shares the same SOT23 package and common-anode topology as BAT54S, but offers lower forward voltage (550 mV vs. 600 mV at 200 mA) and AEC-Q101 qualification-making it a direct upgrade for automotive designs previously using BAT54S.
What is the maximum allowable PCB copper area for thermal relief with BAT721A-QR at 200 mA continuous?
With Rth(j-a) = 500 K/W on single-sided FR4, dissipating 110 mW (200 mA × 550 mV) raises junction temperature by 55 K above ambient. To hold Tj ≤ 125 °C at Tamb = 85 °C, a minimum 25 mm² copper pour (1.5 oz, connected to all three pins) is recommended to maintain thermal margin.
Does BAT721A-QR support wave soldering, and what are the key footprint constraints?
Yes, BAT721A-QR supports wave soldering per Nexperia's SOT23 footprint (Fig. 6): 2.8 mm × 4.5 mm solder land, 1.4 mm side clearances, and preferred transport direction aligned with Pin 1–3 axis. Avoid solder mask defined pads; use solder mask defined lands with 0.6 mm width for reliable wetting and bridging control.
BAT721A-QR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Diode Configuration:
- 1 Pair Common Anode
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io) (per Diode):
- 200mA
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 200 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 15 µA @ 30 V
- Operating Temperature - Junction:
- 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BAT721A-QR FAQ
1.How can I place an order for BAT721A-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BAT721A-QR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BAT721A-QR reliable?
The price and inventory of BAT721A-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAT721A-QR is usually 5 days.
3.What payment methods are accepted for BAT721A-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAT721A-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAT721A-QR?
BAT721A-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAT721A-QR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BAT721A-QR?
For technical support, including BAT721A-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAT721A-QR requirements.
6.How does Aetrix verify that BAT721A-QR is sourced from the original manufacturer or authorized distributors?
All BAT721A-QR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BAT721A-QR meets industry standards.
7.What is the process for return or replacement of BAT721A-QR?
All BAT721A-QR units undergo pre-shipment inspection (PSI). If there is an issue with BAT721A-QR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BAT721A-QR part is unused and in its original packaging.
Return procedure for BAT721A-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAT721A-QR Tags
-
BAV99-7-F
Diodes Incorporated
-
BAT54C-7-F
Diodes Incorporated
-
BAV99,215
Nexperia USA Inc.
-
BAT54SLT1G
onsemi
-
BAV70LT1G
onsemi
-
BAT54CLT1G
onsemi
-
BAT54S-7-F
Diodes Incorporated
-
BAV99LT1G
onsemi
-
BAT54S,215
Nexperia USA Inc.
-
BAS40-04LT1G
onsemi
-
MMBD1503-TP
Micro Commercial Co
-
BAV99WT1G
onsemi
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