Vishay T51 vs AVX TCQ/TCO | Automotive Polymer Capacitors
The Vishay T51 is an AEC-Q200 qualified polymer tantalum capacitor series covering 2.2 µF to 680 µF, 2.5 V to 35 V, and ESR values down to 6 mΩ. Vishay provides cross references for many discontinued KYOCERA AVX TCQ ratings. However, TCO designs requiring 150 °C operation or 50 V ratings need additional review because they exceed the current T51 range.
Vishay T51 Specifications
| Parameter | Vishay T51 |
| Technology | Conductive polymer tantalum |
| Capacitance range | 2.2 µF to 680 µF |
| Rated voltage | 2.5 VDC to 35 VDC |
| Capacitance tolerance | ±20% |
| ESR | Down to 6 mΩ at 100 kHz |
| Operating temperature | -55 °C to +125 °C |
| Temperature note | Voltage derating required above +105 °C |
| Qualification | AEC-Q200 qualified |
| Humidity capability | 85 °C / 85% RH at rated voltage |
| Surge testing | 100% surge current tested |
| Case sizes | B: 3528-21; V: 7343-20; D: 7343-31 |
| Termination | 100% tin, lead-free |
| Packaging | 7-inch tape and reel |
T51 vs AVX TCQ and TCO
| Feature | Vishay T51 | AVX TCQ | AVX TCO |
| Current status | Current Vishay product family | Discontinued | Discontinued |
| Technology | Conductive polymer tantalum | Automotive conductive polymer | High-temperature automotive polymer |
| Qualification | AEC-Q200 | Meets AEC-Q200 requirements | Meets AEC-Q200 requirements |
| Temperature range | -55 °C to +125 °C | -55 °C to +125 °C | Up to +150 °C |
| Voltage range | 2.5 V to 35 V | 2.5 V to 50 V | Includes 50 V configurations |
| Replacement potential | Direct cross available for many TCQ ratings | Original series | Requires detailed thermal and voltage review |
Representative AVX TCQ to Vishay T51 Cross References
The following examples are identified as available in Vishay’s January 2026 cross-reference guide.
| Capacitance | Voltage | ESR | Case | AVX TCQ Part Number | Vishay T51 Part Number |
| 100 µF | 2.5 V | 70 mΩ | B | TCQB107M002#0070E | T51B107M2R5C0070 |
| 470 µF | 2.5 V | 6 mΩ | D | TCQD477M002#0006M | T51D477M2R5C0006 |
| 100 µF | 4 V | 70 mΩ | B | TCQB107M004#0070E | T51B107M004C0070 |
| 220 µF | 4 V | 25 mΩ | D | TCQD227M004#0025E | T51D227M004C0025 |
| 330 µF | 4 V | 25 mΩ | D | TCQD337M004#0025E | T51D337M004C0025 |
| 100 µF | 6.3 V | 45 mΩ | B | TCQB107M006#0045E | T51B107M6R3C0045 |
| 220 µF | 6.3 V | 25 mΩ | D | TCQD227M006#0025E | T51D227M6R3C0025 |
| 330 µF | 6.3 V | 25 mΩ | D | TCQD337M006#0025E | T51D337M6R3C0025 |
| 100 µF | 10 V | 40 mΩ | D | TCQD107M010#0040E | T51D107M010C0040 |
| 47 µF | 16 V | 70 mΩ | D | TCQD476M016#0070E | T51D476M016C0070 |
Typical Applications
Vishay T51 capacitors are suitable for:
Automotive infotainment and cockpit electronics
ADAS and vehicle control power rails
DC/DC converter and point-of-load output filtering
Storage and networking infrastructure
Industrial electronics requiring high-temperature operation
Stock, Lead Time, and RFQ
T51 availability varies significantly by capacitance, voltage, ESR, and case code. Some ratings in the Vishay cross-reference guide are available, while others remain under development or on the product roadmap.
DataStorageIC can assist with:
Exact T51 part-number availability
Remaining AVX TCQ or TCO inventory
Lead time and reel quantity
Date-code and traceability requirements
Alternative capacitance, voltage, or ESR ratings
Availability is subject to confirmation and prior sale. For an accurate quotation, provide the complete manufacturer part number, required quantity, acceptable date-code range, delivery country, and target delivery date.
Frequently Asked Questions
1. Is Vishay T51 AEC-Q200 qualified?
Yes. Vishay identifies the T51 as an AEC-Q200 qualified automotive-grade polymer capacitor series. Qualification includes temperature cycling, biased humidity, operational life, vibration, mechanical shock, solderability, and terminal-strength testing.
2. Is every AVX TCQ part replaceable with a Vishay T51?
No. Vishay provides many specific TCQ-to-T51 crosses, but some ratings are still under development or on the roadmap. The complete electrical rating, case, ESR, and order code must be checked.
3. What is the lowest ESR available in the T51 series?
The current T51 portfolio includes ESR ratings down to 6 mΩ, depending on capacitance, voltage, and case size.
4. Can T51 replace a 150 °C AVX TCO capacitor?
Generally not without redesign or additional qualification. T51 is rated to +125 °C, while TCO was designed for operation up to +150 °C.
5. What information is required for a T51 quotation?
Provide the complete T51 or AVX part number, quantity, target delivery date, delivery country, acceptable date-code range, packaging preference, and any PPAP, traceability, or inspection requirements.
