B72540E0170K062 EPCOS Varistor (Varistors Chip) In Stock
EPCOS B72540E0170K062 is a surface-mount chip varistor rated for 17 V RMS continuous voltage with a 44 V clamping voltage at 8/20 µs and 7.2 J energy absorption capacity, providing compact overvoltage protection in automotive and industrial electronics.
- Manufacturer
- EPCOS
- Package
- Varistors Chip
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- B72540E0170K062 Datasheet PDF
- Category
- Varistor
- Price
- From $1.1500(MOQ 100)
- Temp Range
- -55.0°C to 175.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 17 V RMS maximum continuous operating voltage with 44 V clamping at 8/20 µs for tight transient suppression
- 7.2 J maximum energy absorbing capacity handles repeated surge events without degradation
- Flame-proof construction meets safety requirements for consumer and industrial overvoltage protection devices
- Compact chip varistor package (5.7 mm x 2.5 mm) for surface-mount PCB integration
- RoHS-compliant JESD-609 Code e3 for lead-free reflow soldering in green electronics builds
Applications
The EPCOS B72540E0170K062 chip varistor is used in power supply input protection circuits, automotive ECU power rails, and industrial sensor interfaces where transient overvoltages from line surges, inductive load switching, or ESD must be clamped below 44 V to protect downstream components. Its 7.2 J energy absorbing capacity and 17 V RMS rating make it suitable for 12 V automotive bus protection, USB power line filtering, and motor drive snubber networks. Engineers also deploy it in telecommunications line cards and smart meter power inputs where IEC 61000-4-5 surge immunity up to 8/20 µs waveforms must be achieved without discrete through-hole varistor bulk.
Specifications
| Reach Compliance Code | Compliant |
| Factory Lead Time | 14Weeks |
| YTEOL | 7.47 |
| Additional Feature | FLAME PROOF |
| Circuit RMS Voltage-Max | 17V |
| Energy Absorbing Capacity-Max | 7.2J |
| JESD-609 Code | e3 |
| Mounting Feature | SURFACE MOUNT |
| Package Height | 2.5mm |
| Package Length | 5.7mm |
| Package Shape | RECTANGULAR PACKAGE |
| Package Style | SMT |
| Package Width | 5mm |
| Packing Method | TR, BLISTER, 7 INCH |
| Rated Power Dissipation (P) | 0.02W |
| Rated Temperature | 150°C |
| Reference Standard | AEC-Q200 |
| Resistor Type | VARISTOR |
| Surface Mount | YES |
| Technology | CERAMIC |
| Terminal Finish | MATTE TIN OVER NICKEL |
| Terminal Placement | DUAL ENDED |
| Terminal Shape | WRAPAROUND |
| Working Voltage | 22V |
| Package | Varistors Chip |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8533.40.40.00 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the 44 V clamping voltage of the B72540E0170K062 protect circuits operating on a 12 V automotive bus?
On a 12 V automotive bus, load dump transients can reach 60 V to 80 V for tens of milliseconds. The B72540E0170K062 begins conducting at its varistor voltage near 22 V DC maximum continuous and clamps the line to 44 V during an 8/20 µs surge pulse, keeping the bus voltage well below the 60 V absolute maximum of most automotive-grade ICs. Its 7.2 J energy capacity allows it to absorb multiple such transients before replacement.
What is the significance of the 8/20 µs test waveform in the B72540E0170K062 specification, and which standards use it?
The 8/20 µs waveform represents an 8 µs rise time and 20 µs half-value decay, which simulates the current profile of indirect lightning strikes and switching surges per IEC 61000-4-5 and IEEE C62.41. The B72540E0170K062 clamps to 44 V maximum under this waveform, making it a valid protection element for equipment needing immunity to Level 2 or Level 3 surge tests in industrial and telecom standards.
How does a chip varistor like the B72540E0170K062 compare to a TVS diode at 17 V RMS for line surge protection?
A varistor like the B72540E0170K062 offers higher energy absorption — 7.2 J — compared to a typical surface-mount TVS diode that handles 0.4 W to 1.5 kW peak pulse, making it better suited for repetitive or high-energy surge environments. However, TVS diodes clamp more precisely and respond in sub-picosecond times, while a varistor response is in the nanosecond range. For 17 V AC line protection where energy is the primary concern, the varistor is preferred; for precision ESD protection on logic lines, a TVS diode is more appropriate.
What does the flame-proof designation of the B72540E0170K062 mean for safety compliance in consumer electronics?
Flame-proof varistors are constructed so that if the component fails under extreme overvoltage or overcurrent conditions, it does not propagate fire to the surrounding PCB or enclosure. This property is required by IEC 60065 (audio/video equipment) and IEC 60950 / IEC 62368-1 (IT and AV equipment) for components on primary-side power circuits. The flame-proof designation of the B72540E0170K062 simplifies compliance with these safety standards in consumer and industrial products sold in the EU and internationally.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 100+ | $1.5271 | $152.71 |
| 250+ | $1.4420 | $360.51 |
| 500+ | $1.3907 | $695.36 |
| 1000+ | $1.2800 | $1280.00 |
| 1500+ | $1.1700 | $1755.00 |
| 3000+ | $1.1500 | $3450.00 |
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