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Nexperia USA Inc. BAT721S-QR
- Part No.:
- BAT721S-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BAT721S-QR.pdf
- Description:
- DIODE ARR SCHOTTKY 40V TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,597
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Product details
Overview
BAT721S-QR from Nexperia is a planar Schottky barrier dual diode in SOT23 package, featuring integrated guard ring for stress protection. It delivers 40 V reverse voltage rating, 200 mA forward current per diode, and 550 mV forward voltage at 200 mA (pulsed), enabling ultra-high-speed switching and reverse polarity protection in automotive power rails.
For engineers reviewing the BAT721S-QR datasheet, BAT721S-QR pinout, BAT721S-QR application, or BAT721S-QR equivalent, key selection criteria include low VF (300–550 mV across 10–200 mA), low 40–50 pF capacitance at 0 V, AEC-Q101 qualification, and shared-cathode/anode pinning for compact dual-diode routing in space-constrained PCB layouts.
Technical Context
This dual Schottky diode integrates two independent junctions in a single SOT23-3 package with shared terminal (Pin 3 = K1/A2), enabling bidirectional clamping or complementary rectification without external interconnect. Its planar construction with guard ring ensures robust ESD and transient stress immunity.
The device operates across –65 °C to +150 °C ambient, with thermal resistance Rth(j-a) = 500 K/W on FR4 PCB, and exhibits low leakage (15 µA @ 30 V, 25 °C; 3 mA @ 30 V, 100 °C) - critical for battery-sensitive reverse-polarity protection and low-power line termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VR) | 40 V - supports 24 V automotive systems with 66 % safety margin against load dump transients. |
| Forward Current (IF) | 200 mA per diode - sufficient for signal-level clamping and low-power rail protection without derating. |
| Forward Voltage (VF) | 300 mV @ 10 mA; 550 mV @ 200 mA - minimizes conduction loss in always-on protection paths. |
| Reverse Current (IR) | 15 µA @ 30 V, 25 °C - ensures negligible standby drain in battery-backed circuits. |
| Diode Capacitance (Cd) | 40–50 pF @ 0 V, 1 MHz - enables >100 MHz signal integrity in high-speed line termination. |
| Junction Temp (Tj) | 125 °C max - allows operation in under-hood automotive environments without thermal shutdown. |
Pinout & Package
Encapsulated in a standard SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), the BAT721S-QR uses a 3-terminal configuration optimized for dual-diode functionality with shared node.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (Diode 1) | Input node for first Schottky junction; connects to protected supply or signal source. |
| 2 | Cathode (Diode 2) | Output node for second junction; used for clamping to reference or ground. |
| 3 | Cathode (Diode 1) / Anode (Diode 2) | Shared terminal enabling compact back-to-back or series-connected dual-diode topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage | VF ≤ 550 mV @ 200 mA enables <100 mW conduction loss in 24 V reverse-protection paths. |
| Low capacitance | 40–50 pF @ 0 V preserves signal edge rate in USB, CAN, or LVDS line termination. |
| AEC-Q101 qualified | Stress-tested for automotive temperature cycling, HTRB, and ESD - suitable for ASIL-B supporting functions. |
| Integrated guard ring | Enhances ruggedness against EOS/ESD events in unshielded harness interfaces and connector hot-plug scenarios. |
Applications
| Automotive Power Rail Protection | High-Speed Signal Line Termination |
|---|---|
Use Scenario: Reverse battery connection in 12 V/24 V vehicle ECUs and body control modules. IC Role / Device Role / Timing Role: Dual-diode configured as back-to-back clamp to block reverse current while passing forward supply. Use Value: Prevents fuse blowout and MOSFET gate damage with <550 mV forward drop and no recovery delay. |
Use Scenario: RS-485 or CAN bus stub termination on multi-drop networks. IC Role / Device Role / Timing Role: Low-capacitance Schottky pair absorbs reflections without distorting 1–5 Mbps data edges. Use Value: Maintains signal integrity with 40–50 pF total capacitance and sub-nanosecond switching. |
| Voltage Clamping for Sensor Inputs | Ultra-Fast Switching in DC-DC Feedback Paths |
Use Scenario: Overvoltage protection for analog sensor inputs exposed to 3.3 V or 5 V rails. IC Role / Device Role / Timing Role: Clamp diode pair limits input to VCC + 0.55 V and GND – 0.3 V using shared-pin topology. Use Value: Responds within picoseconds to transients up to ±40 V, preserving ADC accuracy and LDO stability. |
Use Scenario: Synchronous rectifier freewheel path in buck converter feedback sensing networks. IC Role / Device Role / Timing Role: Fast-recovery Schottky pair replaces discrete diodes in isolated feedback optocoupler bias paths. Use Value: Eliminates reverse recovery charge, reducing noise coupling into error amplifier inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky dual diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSR20F40NXT5G | Same SOT23-3, 40 V VR, but higher VF (600 mV @ 200 mA); no AEC-Q101 documentation confirmed. | Acceptable for industrial line termination; not validated for automotive under-hood use. | Select only if AEC-Q101 compliance is not required and 50 mV VF penalty is acceptable. |
| Vishay VS-2EDH04-M3/84A | SOT23-3, 40 V VR, 200 mA IF, VF = 520 mV @ 200 mA; AEC-Q101 qualified; Cd = 55 pF. | Higher capacitance reduces bandwidth margin in >50 MHz signal lines vs. BAT721S-QR's 40–50 pF. | Prefer when tighter VF tolerance (±10 mV) is needed over minimal capacitance impact. |
Compared with NSR20F40NXT5G and VS-2EDH04-M3/84A, the BAT721S-QR offers the lowest combined VF/Cd trade-off and documented AEC-Q101 qualification - making it optimal for automotive signal integrity and power-rail protection where both low loss and high speed are mandatory.
Availability
BAT721S-QR is available at Aetrix Electronics and suitable for automotive power rail protection, high-speed signal line termination, voltage clamping for sensor inputs, and ultra-fast switching in DC-DC feedback paths requiring stable component supply and long-term lifecycle assurance.
Supply support for BAT721S-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 logic, discrete, and MOSFET solutions, headquartered in Nijmegen, Netherlands.
The BAT721S-QR belongs to Nexperia's AEC-Q101-qualified Schottky diode portfolio, engineered specifically for automotive signal integrity, reverse polarity protection, and low-loss clamping in harsh-environment ECUs and ADAS subsystems.
FAQ
What is the maximum continuous forward current per diode in BAT721S-QR?
The BAT721S-QR supports 200 mA continuous forward current per diode under recommended operating conditions, verified per IEC 60134 limiting values. Derating is required above 85 °C ambient due to thermal resistance of 500 K/W on standard FR4 PCB.
Is BAT721S-QR suitable for reverse polarity protection in 24 V automotive systems?
Yes - its 40 V reverse voltage rating provides 66 % margin above nominal 24 V systems and transient peaks up to ISO 7637-2 Pulse 5a (120 V). Combined with AEC-Q101 qualification and guard ring, it meets requirements for under-hood ECU protection.
How does the shared-pin configuration (Pin 3 = K1/A2) affect circuit layout?
Pin 3 serves as cathode for Diode 1 and anode for Diode 2, enabling compact back-to-back or series configurations without external traces. This reduces parasitic inductance in high-frequency clamping paths and simplifies routing in tight SMT layouts.
What is the typical reverse leakage current at elevated temperature?
At 30 V reverse bias and 100 °C junction temperature, typical reverse leakage is 3 mA per diode - a design-critical value for battery-drain calculations in always-on automotive modules such as door controllers or telematics units.
BAT721S-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 Series Connection
- 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-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BAT721S-QR FAQ
1.How can I place an order for BAT721S-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BAT721S-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 BAT721S-QR reliable?
The price and inventory of BAT721S-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAT721S-QR is usually 5 days.
3.What payment methods are accepted for BAT721S-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAT721S-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAT721S-QR?
BAT721S-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAT721S-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 BAT721S-QR?
For technical support, including BAT721S-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAT721S-QR requirements.
6.How does Aetrix verify that BAT721S-QR is sourced from the original manufacturer or authorized distributors?
All BAT721S-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 BAT721S-QR meets industry standards.
7.What is the process for return or replacement of BAT721S-QR?
All BAT721S-QR units undergo pre-shipment inspection (PSI). If there is an issue with BAT721S-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 BAT721S-QR part is unused and in its original packaging.
Return procedure for BAT721S-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAT721S-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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