1.0µF 400V DC Axial Polyester Capacitor
Part Number: 400QAS1
1.0µF • 400V DC • 85°C • Film Capacitor
Capacitance
1.0µF
Voltage
400V DC
Tolerance
±±20%
Temp Rating
85°C
Mounting
axial
Dielectric
polyester
$4.95 each × 1
About the 1.0µF 400V DC Axial Polyester Capacitor
Axial Polyester capacitor. 1.0µF, 400V DC. 85°C rated.
Applications for 1.0µF 400V DC Film Capacitors
Typical design scenarios where the 400QAS1 (1.0µF / 400V DC) is specified:
Power Conversion
Snubber circuits, voltage multipliers, and power factor correction stages at 400V DC operating voltage
Industrial Controls
Relay suppression, arc quenching, and EMI filtering in industrial switchgear and control panels
Audio & Legacy Equipment
Amplifier coupling, crossover networks, and drop-in replacements for vintage and legacy circuit boards
Precision & Timing
Oscillator circuits, sample-and-hold, and measurement instruments requiring stable capacitance
Need a Replacement for 400QAS1?
1.0µF · 400V DC · axial
Our engineers can cross-reference this part to find a compatible replacement that meets or exceeds the original specifications — with full CoC and traceability documentation.
Technical Specifications
Complete specifications for 400QAS1
Why Choose This Film Capacitor?
- 400V DC voltage rating with recommended 20% derating for maximum service life in power circuits
- Part of the QAS series — cross-reference available for equivalent parts from other manufacturers
- 100% electrically tested before shipment for guaranteed in-spec performance
- Ships same-day from US warehouse when ordered before 3 PM EST
Need Technical Assistance?
Our capacitor specialists can help with selection, cross-reference, and application questions.
Why Buy From Specap?
- Family-owned capacitor specialist since 1984
- Experts in hard-to-find & obsolete parts
- Same-day shipping on in-stock items
- 100% electrically tested before shipment
- Volume discounts with no minimum order
- Cross-reference assistance available
Looking for an Equivalent?
We can help cross-reference 400QAS1 with alternative part numbers.
Cross-Reference ToolCapacitor Calculators
Free tools to help with your design
Frequently Asked Questions
Common questions about 400QAS1 and film capacitors
What applications use a 1.0µF 400V DC film capacitor?
This 1.0µF 400V DC film capacitor serves filtering, timing, and energy storage functions in circuits operating within its voltage and temperature ratings.
Can the 400QAS1 handle high-temperature environments?
The 400QAS1 is rated for 85°C, which covers standard commercial and light-industrial environments. For installations in enclosed cabinets or hot climates where ambient temperatures exceed 65°C, consider selecting a 105°C-rated alternative for additional thermal margin.
What is the recommended PCB footprint for the 400QAS1?
The 400QAS1 uses axial mounting. Refer to the manufacturer datasheet for the recommended land pattern. For through-hole parts, ensure the drill diameter is 0.2–0.3mm larger than the lead diameter for reliable hand or wave soldering.
What capacitors can replace the 400QAS1?
Cross-referencing the 400QAS1 requires matching capacitance (1.0µF), voltage (400V DC), temperature rating (85°C), and physical dimensions. ESR and ripple current ratings must also meet or exceed the original spec for reliable operation. Contact our technical team at 800-731-1433 for verified cross-reference options — we maintain compatibility data across major manufacturers.
Should I derate the voltage when using the 400QAS1?
Yes. Industry best practice is to operate capacitors at 60–80% of their rated voltage. For the 400QAS1 rated at 400V DC, this means designing your circuit to keep the applied voltage below 320V under all conditions including transients. Voltage derating significantly extends capacitor life — each 10% reduction in applied voltage can roughly double the expected service life for electrolytic types.
What is the lead time for the 400QAS1?
In-stock items ship same-day when ordered before 3 PM EST, with standard delivery of 2–5 business days within the continental US. If the 400QAS1 shows as out of stock, our sourcing team can typically locate high-voltage film capacitors within 1–2 weeks through our manufacturer and distributor network. Contact us for expedited options or large-quantity pricing.
Can't Find the Capacitor You Need?
We specialize in hard-to-find, obsolete, and specialty capacitors. Our experts can help locate any part.