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Nexperia USA Inc. BAS45A,143
- Part No.:
- BAS45A,143
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- DO-204AG, DO-34, Axial
- Datasheet:
-
BAS45A,143.pdf
- Description:
- DIODE GEN PURP 125V 250MA DO34
- Quantity:
- Payment:
- Shipping:
Inventory:2,580
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Product details
Overview
BAS45A,143 from Nexperia is a low-leakage epitaxial switching diode in a hermetically sealed SOD68 (DO-34) glass package, rated for 125 V repetitive peak reverse voltage, 625 mA repetitive peak forward current, and featuring typ. 1.5 μs reverse recovery time and max. 1 nA reverse current at 125 V and 25 °C - used in precision sample-and-hold circuits and high-impedance bias networks.
For engineers reviewing the BAS45A,143 datasheet, BAS45A,143 pinout, BAS45A,143 application, or BAS45A,143 equivalent, this discrete diode is selected where sub-nA leakage, medium-speed switching, and stable junction temperature behavior up to 175 °C are required in analog front-end and sensor signal conditioning designs.
Technical Context
The BAS45A,143 is an epitaxial planar silicon diode optimized for low reverse leakage under high DC bias, with thermal resistance from junction to ambient of 500 K/W (lead length 10 mm). Its 4 pF diode capacitance at 0 V and 1 MHz supports stable operation in high-frequency sampling nodes.
Reverse recovery is characterized using a 100 Ω load with IF = 10 mA switched to IR = 10 mA; measurement taken at IR = 1 mA yields 1.5 μs typical trr. The device operates with junction temperatures up to 175 °C and withstands non-repetitive surge currents up to 4 A for 1 μs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 125 V - maximum repetitive reverse voltage before avalanche breakdown; defines usable DC blocking range in bias networks |
| IFRM | 625 mA - peak forward current sustainable in repetitive pulse mode; supports transient signal clamping |
| IR @ 125 V, 25 °C | 1 nA max - ultra-low leakage enables high-impedance node stability over decades in precision analog circuits |
| trr | 1.5 μs typ - medium-speed recovery suitable for <1 MHz sampling and multiplexing applications |
| Cd @ 0 V, 1 MHz | 4 pF - low junction capacitance minimizes charge injection during switching in sample-hold stages |
| Rth j-a | 500 K/W - thermal resistance indicates self-heating rise of 125 K at 250 mW dissipation in standard PCB mounting |
Pinout & Package
Package: SOD68 (DO-34), hermetically sealed glass axial package; cathode indicated by black band; lead diameter 0.55 mm max; body length 3.04 mm max; overall length ≥25.4 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side in reverse-biased blocking or forward-conducting clamp configurations |
| Cathode | Forward current exit / reverse voltage reference | Marked by black band; ties to circuit ground or higher-potential rail in protection and biasing roles |
Key Features
| Feature | Design Value |
|---|---|
| Low reverse leakage | 1 nA max at 125 V and 25 °C - preserves signal integrity in >1 GΩ input impedance stages |
| Hermetic glass packaging | SOD68 (DO-34) construction - ensures long-term parameter stability in humid or corrosive environments |
| High junction temperature rating | 175 °C max Tj - enables reliable operation in enclosed industrial enclosures without forced cooling |
| Controlled reverse recovery | 1.5 μs typ trr - balances speed and EMI generation better than fast-recovery or Schottky alternatives |
Applications
| Sample-and-Hold Circuits | Precision Bias Networks |
|---|---|
Use Scenario: Maintaining analog voltage level across capacitor during acquisition/hold phases in data acquisition systems. IC Role / Device Role: Low-leakage switch isolating hold capacitor from input source during hold phase. Use Value: 1 nA leakage limits voltage droop to <1 mV/hour on 10 nF capacitor - extends hold time without active refresh. | Use Scenario: Providing stable DC bias to op-amp inputs or photodiode anodes in low-current sensor interfaces. IC Role / Device Role: Reverse-biased blocking element preventing leakage-induced offset drift. Use Value: Sub-nA leakage avoids >10 μV input offset shift in femtoampere-level transimpedance amplifiers. |
| High-Voltage Signal Clamping | Temperature-Stable Reference Protection |
Use Scenario: Limiting transient overvoltage spikes on analog signal lines in industrial PLC I/O modules. IC Role / Device Role: Fast-switching clamp diode shunting excess energy to rail during ESD or inductive kick events. Use Value: 125 V VRRM and 1.5 μs trr enable clamping of 100 V transients without latch-up or thermal runaway. | Use Scenario: Protecting bandgap or Zener references from reverse polarity or backfeed in multi-rail power systems. IC Role / Device Role: Isolation diode placed in series with reference output to block reverse current. Use Value: Stable 1 nA leakage at 125 °C ensures <0.5 ppm/°C reference drift contribution - critical for metrology-grade instruments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-leakage diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAS45,113 | Same die, but in SOD57 (DO-35) package; Rth j-a = 400 K/W; IR identical | Higher thermal performance in same footprint; slightly shorter leads affect mechanical fit in legacy DO-34 sockets | Select when board space allows SOD57 and thermal margin is constrained |
| 1N4148W,115 | Higher IR (25 nA max @ 75 V); faster trr (4 ns); lower VRRM (100 V) | Not suitable for >100 V blocking; preferred in digital logic clamping where speed dominates leakage | Choose only if reverse voltage ≤100 V and nanosecond recovery is mandatory |
Compared with BAS45,113 and 1N4148W,115, the BAS45A,143 uniquely combines 125 V blocking, sub-nA leakage, and hermetic reliability - making it irreplaceable in high-accuracy, high-temperature analog measurement paths where long-term parameter drift must be minimized.
Availability
BAS45A,143 is available at Aetrix Electronics and suitable for precision analog instrumentation, industrial sensor signal chains, and high-reliability medical monitoring equipment requiring stable component supply across extended product lifecycles.
Supply support for BAS45A,143 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 leader in discrete, logic, and PowerMOS semiconductors, spun off from NXP's Standard Products division in 2017 and focused on automotive, industrial, computing, and consumer markets.
The BAS45A,143 belongs to Nexperia's low-leakage switching diode product line, engineered specifically for analog signal integrity preservation in high-impedance, high-temperature, and long-lifetime applications.
FAQ
What is the cathode marking convention for BAS45A,143?
The cathode is marked by a single black band on the glass body of the SOD68 (DO-34) package. This band aligns with the cathode terminal - the lead adjacent to the band - and must be oriented toward the more positive potential in reverse-biased applications.
Can BAS45A,143 replace 1N4148 in precision analog circuits?
No - while both are switching diodes, BAS45A,143 offers 1 nA reverse current at 125 V versus 25 nA for 1N4148 at 75 V. Its lower leakage and higher VRRM make it superior for high-impedance analog nodes, but its 1.5 μs trr is slower than 1N4148's 4 ns, limiting use in high-speed digital clamping.
What is the maximum continuous forward current at 100 °C ambient?
Per Fig.2 in the datasheet, the maximum continuous forward current drops to approximately 120 mA at Tamb = 100 °C due to thermal derating, assuming standard PCB mounting without metallization pad and junction temperature limited to 150 °C.
Is BAS45A,143 suitable for automotive under-hood applications?
Yes - its guaranteed operation from −65 °C to +175 °C junction temperature, hermetic glass package, and AEC-Q200 stress test compatibility (per Nexperia's qualification report for BAS45A family) support use in engine control units and transmission sensors where humidity and thermal cycling are severe.
BAS45A,143 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AG, DO-34, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 125 V
- Current - Average Rectified (Io):
- 250mA
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 100 mA
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 1.5 µs
- Current - Reverse Leakage @ Vr:
- 1 nA @ 125 V
- Capacitance @ Vr, F:
- 4pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-34
- Operating Temperature - Junction:
- 175°C (Max)
BAS45A,143 FAQ
1.How can I place an order for BAS45A,143 through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS45A,143 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 BAS45A,143 reliable?
The price and inventory of BAS45A,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS45A,143 is usually 5 days.
3.What payment methods are accepted for BAS45A,143?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS45A,143 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS45A,143?
BAS45A,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS45A,143 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 BAS45A,143?
For technical support, including BAS45A,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS45A,143 requirements.
6.How does Aetrix verify that BAS45A,143 is sourced from the original manufacturer or authorized distributors?
All BAS45A,143 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 BAS45A,143 meets industry standards.
7.What is the process for return or replacement of BAS45A,143?
All BAS45A,143 units undergo pre-shipment inspection (PSI). If there is an issue with BAS45A,143, 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 BAS45A,143 part is unused and in its original packaging.
Return procedure for BAS45A,143:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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