My Inquiry
My Account
Nexperia USA Inc. BAS321JF
- Part No.:
- BAS321JF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BAS321JF.pdf
- Description:
- DIODE GEN PURP 250V 250MA SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:16,480
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BAS321J from Nexperia is a high-voltage switching diode in SOD323F (SC-90) package, rated for 200 V reverse voltage, 250 mA forward current, and 50 ns reverse recovery time. It serves as a fast, low-leakage unidirectional switch in automotive and industrial power rail protection circuits.
For engineers reviewing the BAS321J datasheet, BAS321J pinout, BAS321J application, or BAS321J equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance values, and real-world clamping and polarity protection use cases.
Technical Context
The BAS321J is a planar epitaxial silicon switching diode optimized for high-speed turn-off with controlled minority-carrier lifetime. Its 2 pF capacitance at 0 V and 50 ns trr enable clean signal edge handling in 1–10 MHz switching nodes.
Designed for surface-mount operation on FR4 PCBs with standard footprint, it features 100 nA reverse leakage at 200 V and 25 °C, and junction-to-ambient thermal resistance of 300 K/W under single-sided copper conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR | 200 V maximum continuous reverse voltage - supports 24 V and 48 V industrial bus clamping without breakdown |
| VRRM | 250 V repetitive peak reverse voltage - withstands transient surges up to 250 V in automotive load-dump scenarios |
| IF | 250 mA DC forward current - sufficient for signal-level and low-power logic interface protection paths |
| trr | 50 ns reverse recovery time - enables reliable operation in PWM frequencies up to 10 MHz |
| IR | 100 nA reverse leakage at VR = 200 V - ensures minimal standby power loss in battery-backed systems |
| Cd | 2 pF diode capacitance at VR = 0 V, f = 1 MHz - preserves signal integrity in high-frequency data line protection |
| Rth(j-a) | 300 K/W junction-to-ambient thermal resistance - defines derating curve for ambient temperatures up to 85 °C on standard FR4 |
Pinout & Package
SOD323F (SC-90) plastic surface-mount package: 1.7 mm × 1.25 mm × 0.7 mm body, flat leads, cathode marked with band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to higher-potential node during reverse bias; carries return current path in clamp configurations |
| 2 | Anode (A) | Connected to lower-potential node; source of forward conduction when biased above VF threshold |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22-A114 |
| High-speed switching | 50 ns trr enables use in flyback snubbers and synchronous rectifier gate drive isolation |
| Low leakage | 100 nA IR at 200 V ensures <1 µW standby dissipation in always-on 12 V/24 V monitoring circuits |
| Small footprint | SOD323F package occupies 2.125 mm² board area - fits dense layout constraints in space-constrained ECUs |
Applications
| Automotive Load-Dump Protection | Industrial Signal Line Clamping |
|---|---|
Use Scenario: Protecting CAN transceiver inputs against ISO 7637-2 pulse 5a (load dump up to 60 V). IC Role / Device Role / Timing Role: Fast-acting shunt clamp that conducts excess energy before downstream ICs exceed absolute max ratings. Use Value: 200 V VR rating and 50 ns trr prevent latch-up in 5 V CAN PHY receivers during 40 ms overvoltage events. |
Use Scenario: Limiting RS-485 differential input voltage swing to ±12 V in factory automation networks. IC Role / Device Role / Timing Role: Bidirectional clamping pair (two BAS321J back-to-back) limits common-mode excursions. Use Value: 2 pF capacitance avoids signal distortion at 10 Mbps data rates; 100 nA leakage prevents DC bias shift. |
| Reverse Polarity Input Protection | DC-DC Converter Snubber |
Use Scenario: Preventing damage to 24 V power supplies when input terminals are accidentally reversed. IC Role / Device Role / Timing Role: Series-connected anode-to-load configuration blocks reverse current flow while passing forward current. Use Value: 250 mA IF rating supports >20 W system loads; 1.25 V VF at 200 mA yields <250 mW conduction loss. |
Use Scenario: Suppressing voltage spikes across MOSFET drains in 300 kHz buck converters. IC Role / Device Role / Timing Role: RCD snubber diode that recirculates leakage inductance energy during turn-off. Use Value: 50 ns trr ensures full energy transfer before next switching cycle; 250 V VRRM handles 30% overshoot margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBD301LT1G | 200 V VRRM, 100 mA IF, 4 ns trr, SOT-23 package | Lower IF rating limits use to signal-level only; faster trr suits >50 MHz RF clamping | Select when ultra-fast recovery is critical and current demand is ≤100 mA |
| Diodes Incorporated BAV99W-7-F | 100 V VRRM, 215 mA IF, 4 ns trr, SOT-323 dual-diode | Half the reverse voltage rating; dual configuration saves board space but lacks AEC-Q101 | Choose for cost-sensitive consumer designs where 100 V margin suffices and dual topology is preferred |
Compared with MMBD301LT1G and BAV99W-7-F, the BAS321J uniquely balances 200 V robustness, 250 mA current capability, AEC-Q101 compliance, and SOD323F miniaturization - making it the only option qualified for under-hood automotive clamping with ≥200 mA load support.
Availability
BAS321J is available at Aetrix Electronics and suitable for automotive load-dump protection, industrial signal line clamping, and reverse polarity input protection requiring stable component supply across production lifecycles.
Supply support for BAS321J 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 essential efficiency, delivering high-performance, reliable discrete, logic, and MOSFET devices.
The BAS321J belongs to Nexperia's AEC-Q101-qualified high-voltage switching diode product line, engineered for robustness in automotive power management and industrial interface protection.
FAQ
Is BAS321J suitable for automotive under-hood applications?
Yes. The BAS321J is AEC-Q101 qualified and rated for junction temperatures up to 150 °C. Its 200 V VR, 250 mA IF, and 50 ns trr meet requirements for engine control unit (ECU) power rail clamping and reverse battery protection in harsh environments.
What is the thermal performance on standard FR4 PCB?
When mounted on a single-sided, tin-plated FR4 PCB with standard footprint, the BAS321J exhibits Rth(j-a) = 300 K/W. At 25 °C ambient and 250 mA DC forward current, junction temperature rise is approximately 45 °C, well within the 150 °C limit.
Can BAS321J replace BAS21 in existing designs?
No. The BAS21 has VRRM = 250 V but uses DO-35 through-hole packaging and 300 ns trr. BAS321J offers superior speed (50 ns), SMD compatibility, and AEC-Q101 qualification - but requires PCB redesign due to SOD323F footprint and different thermal behavior.
Does BAS321J support bidirectional clamping?
Not alone. As a single anode-cathode device, it conducts only in one direction. For bidirectional clamping (e.g., RS-485), two BAS321J diodes must be connected in series opposition - anode-to-anode or cathode-to-cathode - to handle both positive and negative transients.
BAS321JF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 250 V
- Current - Average Rectified (Io):
- 250mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.25 V @ 200 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 100 nA @ 200 V
- Capacitance @ Vr, F:
- 2pF @ 0V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
- Operating Temperature - Junction:
- 150°C (Max)
BAS321JF FAQ
1.How can I place an order for BAS321JF through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS321JF 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 BAS321JF reliable?
The price and inventory of BAS321JF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS321JF is usually 5 days.
3.What payment methods are accepted for BAS321JF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS321JF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS321JF?
BAS321JF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS321JF 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 BAS321JF?
For technical support, including BAS321JF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS321JF requirements.
6.How does Aetrix verify that BAS321JF is sourced from the original manufacturer or authorized distributors?
All BAS321JF 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 BAS321JF meets industry standards.
7.What is the process for return or replacement of BAS321JF?
All BAS321JF units undergo pre-shipment inspection (PSI). If there is an issue with BAS321JF, 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 BAS321JF part is unused and in its original packaging.
Return procedure for BAS321JF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAS321JF Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
Tech Hub
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…
