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Nexperia USA Inc. BAT721A,235
- Part No.:
- BAT721A,235
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BAT721A,235.pdf
- Description:
- DIODE ARR SCHOTTKY 40V TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,283
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Product details
Overview
BAT721A 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 low forward voltage (550 mV at 200 mA) enabling efficient ultra-high-speed switching in power rail clamping and reverse polarity protection circuits.
For engineers reviewing the BAT721A datasheet, BAT721A pinout, BAT721A application, or BAT721A equivalent, key selection criteria include its dual-cathode/common-anode topology, 40 V reverse voltage rating, 550 mV VF at full rated current, 15 µA IR at 30 V/25 °C, and 40–50 pF capacitance - critical for high-frequency line termination and low-loss DC bias networks.
Technical Context
The BAT721A integrates two independent Schottky diodes sharing a common anode terminal (Pin 3), forming a compact dual-diode structure optimized for space-constrained PCB layouts. Its planar construction with guard ring enhances ruggedness against transient overstress without compromising low-voltage operation.
Designed for low-loss unidirectional conduction, it delivers typ. 300 mV VF at 10 mA and 420 mV at 100 mA, with thermal resistance Rth(j-a) = 500 K/W on standard FR4 - confirming suitability for ambient-temperature-limited consumer and industrial signal-path applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VR) | 40 V - supports clamping and protection in 24 V and 36 V nominal systems without breakdown risk. |
| Forward Current (IF) | 200 mA continuous - sufficient for low-power logic-level signal routing and auxiliary supply rail steering. |
| Forward Voltage (VF) | 550 mV @ 200 mA - minimizes conduction loss and self-heating in battery-powered or thermally sensitive designs. |
| Reverse Current (IR) | 15 µA @ 30 V, 25 °C - ensures low leakage in high-impedance bias networks and precision reference paths. |
| Diode Capacitance (Cd) | 40–50 pF @ 0 V, 1 MHz - enables clean high-speed signal termination up to ~100 MHz without excessive loading. |
| Junction Temperature (Tj) | 125 °C max - defines safe operating envelope under pulsed or ambient-temperature-limited conditions. |
Pinout & Package
Encapsulated in SOT23 (TO-236AB) package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | K1 (Cathode of Diode 1) | Provides dedicated cathode path for first Schottky diode; routed separately for asymmetric clamping or dual-rail protection. |
| 2 | K2 (Cathode of Diode 2) | Independent cathode output for second diode; enables parallel or differential use with shared anode (Pin 3). |
| 3 | A1,A2 (Common Anode) | Single input node for both diodes - simplifies PCB layout in OR-ing, redundancy, or bidirectional clamp configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage | 550 mV @ 200 mA - reduces power dissipation by >40% vs. comparable silicon diodes in same footprint. |
| Low capacitance | 40–50 pF - preserves signal integrity in USB 2.0, I²C, and other <100 MHz digital interfaces. |
| Integrated guard ring | Enhances ESD and surge robustness - eliminates need for external transient suppressors in Class 2 IEC 61000-4-2 environments. |
| Common-anode dual topology | Enables compact OR-ing of two power sources or dual-rail clamping with single anode connection point. |
Applications
| USB Port Protection | Industrial Sensor Biasing |
|---|---|
Use Scenario: Protecting USB 2.0 data lines and VBUS from reverse insertion and ESD transients. IC Role / Device Role / Timing Role: Dual Schottky clamp diode providing low-capacitance, low-VF path to ground and VCC rails. Use Value: 40–50 pF capacitance avoids signal degradation; 550 mV VF ensures minimal voltage drop during clamping events. |
Use Scenario: Providing stable bias current to analog sensor bridges while blocking reverse leakage. IC Role / Device Role / Timing Role: Precision current-steering diode pair isolating sensor excitation from supply noise. Use Value: 15 µA IR at 30 V prevents measurement drift; common-anode layout simplifies dual-sensor channel routing. |
| DC Power Rail OR-ing | Reverse Polarity Input Protection |
Use Scenario: Combining two independent 5 V or 3.3 V supplies for redundancy in embedded controllers. IC Role / Device Role / Timing Role: Dual-anode OR-ing diode enabling seamless source switchover without control logic. Use Value: 550 mV VF limits voltage drop to <2% at 200 mA; SOT23 footprint fits tight board spacing near connectors. |
Use Scenario: Preventing damage when external 12 V or 24 V power adapters are connected with reversed polarity. IC Role / Device Role / Timing Role: Series-connected Schottky diode blocking reverse current while minimizing forward loss. Use Value: 40 V VR rating covers automotive and industrial input surges; 200 mA IF supports typical IoT node loads. |
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 | 40 V VR, 200 mA IF, VF = 520 mV @ 200 mA, SOD-323 package (smaller, 1.7 × 1.25 mm) | Higher density but lower thermal mass; less suitable for sustained 200 mA due to Rth(j-a) ≈ 650 K/W | Select for ultra-compact layouts where peak pulse current dominates over continuous dissipation. |
| Vishay SDM20U40 | 40 V VR, 200 mA IF, VF = 570 mV @ 200 mA, SOT-23 package, higher IR (25 µA @ 30 V) | Higher leakage may affect precision biasing; identical pinout enables drop-in replacement in non-critical clamping roles | Prefer where cost sensitivity outweighs leakage-critical analog sensing requirements. |
Compared with NSR20F40NXT5G and SDM20U40, the BAT721A offers the lowest thermal resistance (500 K/W) among SOT23 dual Schottkys and the tightest IR specification (15 µA), making it optimal for thermally constrained or low-leakage analog front-end designs.
Availability
BAT721A is available at Aetrix Electronics and suitable for USB port protection, industrial sensor biasing, DC power rail OR-ing, and reverse polarity input protection requiring stable component supply across production lifecycles.
Supply support for BAT721A 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 discrete and logic devices, headquartered in Nijmegen, Netherlands.
The BAT721A belongs to Nexperia's Schottky diode portfolio designed specifically for low-loss, high-speed signal and power path protection in consumer, computing, and industrial electronics.
FAQ
Is BAT721A automotive qualified?
No. The BAT721A is explicitly marked as non-automotive qualified per Nexperia's revision history (v.8, 20240205). It lacks AEC-Q101 qualification, temperature cycling validation beyond 125 °C junction, and automotive-grade traceability. For automotive use, Nexperia recommends the BAT721B-Q series.
What is the maximum pulsed forward current rating?
The BAT721A supports a non-repetitive peak forward current (IFSM) of 1 A for half-sine-wave pulses ≤8.3 ms, per JEDEC test method with Tj(init) = 25 °C. This rating applies only to short-duration surge events, not continuous operation.
Can BAT721A be used in place of a single Schottky diode?
Yes - either cathode (Pin 1 or Pin 2) can be used with the common anode (Pin 3) to configure a single Schottky diode. However, the unused cathode must be left floating or tied to a defined potential; it must not be shorted to other nodes without verifying circuit impact.
Does BAT721A require derating above 25 °C ambient?
Yes. With Rth(j-a) = 500 K/W, junction temperature rises ~100 K per 200 mW dissipated. At 200 mA and 550 mV VF, power dissipation is 110 mW - resulting in +55 K rise above ambient. Full 200 mA operation is only sustainable up to ~70 °C ambient to stay within 125 °C Tj limit.
BAT721A,235 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 (DC)
- 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 (Max)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BAT721A,235 FAQ
1.How can I place an order for BAT721A,235 through Aetrix?
Please submit a Request for Quotation (RFQ) for BAT721A,235 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,235 reliable?
The price and inventory of BAT721A,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAT721A,235 is usually 5 days.
3.What payment methods are accepted for BAT721A,235?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAT721A,235 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAT721A,235?
BAT721A,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAT721A,235 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,235?
For technical support, including BAT721A,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAT721A,235 requirements.
6.How does Aetrix verify that BAT721A,235 is sourced from the original manufacturer or authorized distributors?
All BAT721A,235 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,235 meets industry standards.
7.What is the process for return or replacement of BAT721A,235?
All BAT721A,235 units undergo pre-shipment inspection (PSI). If there is an issue with BAT721A,235, 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,235 part is unused and in its original packaging.
Return procedure for BAT721A,235:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAT721A,235 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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