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onsemi 1N6294A
- Part No.:
- 1N6294A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1N6294A.pdf
- Description:
- TVS DIODE 77.8VWM 125VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,476
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Product details
Overview
1N6294A from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a working peak reverse voltage (VRWM) of 77.8 V, clamping voltage (VC) of 125 V at 12 A peak pulse current (IPP), and sub-1 ns response time. It is used in industrial power supplies, telecom line cards, and medical equipment input stages.
For engineers reviewing the 1N6294A datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating DC bus, VC vs. protected IC's absolute maximum rating, surge current capability per IEC 61000-4-5 waveform, and UL 497B recognition for isolated loop protection.
Technical Context
The 1N6294A operates as a silicon avalanche diode with controlled Zener breakdown behavior, triggered when reverse voltage exceeds its 91 V nominal breakdown voltage (VBR) at 1 mA test current. Its low dynamic impedance ensures stable clamping under fast-rising transients up to 1500 W peak power (1 ms pulse).
It is housed in an axial-leaded Surmetic plastic package (Case 41A) with cathode polarity band marking, rated for lead temperature up to 230°C during soldering. The device meets Class 3 ESD immunity (>16 kV HBM) and is UL 497B recognized for isolated loop circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 77.8 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system DC rail by ≥10% for reliable margin. |
| VBR @ IT = 1 mA | 86.5–95.5 V - Breakdown voltage range defining turn-on threshold; tight tolerance enables predictable clamping onset. |
| VC @ IPP = 12 A | 125 V - Maximum clamped voltage seen by protected circuit during full-rated surge; determines if downstream ICs remain within safe operating area. |
| PPK | 1500 W @ 1 ms - Peak transient energy absorption capacity; validated per Figure 5 non-repetitive pulse waveform. |
| Response Time | <1 ns - Time from transient onset to clamping conduction; critical for protecting high-speed logic and analog front-ends. |
| IR @ VRWM | <5 µA - Reverse leakage at working voltage; negligible power loss and no thermal drift in standby operation. |
| UL Recognition | UL 497B QVGV2 - Certified for use in isolated communication loops; confirms compliance with surge endurance, dielectric withstand, and flammability requirements. |
Pinout & Package
1N6294A uses an axial-leaded plastic package (Case 41A, DO-15 variant), with cathode identified by a colored band. Leads are tin-plated, solderable, and rated for 230°C (10 s, 1/16″ from case). Mounting orientation is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground-reference terminal in unidirectional configuration | Connected to system ground or low-impedance return path; forms clamping path with cathode to shunt surge current away from load. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., DC input, signal trace); reverse-biased during normal operation and avalanches during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge testing without degradation when properly mounted with short traces. |
| Clamp voltage ≤125 V @ 12 A | Ensures protected 100 V-rated DC-DC converters or microcontrollers remain below absolute maximum ratings during worst-case transients. |
| ESD rating >16 kV (HBM) | Eliminates need for additional ESD protection on board-level interfaces exposed to handling or connector mating. |
| UL 497B recognition | Validates suitability for telecom and industrial isolation barriers without requiring end-equipment re-certification. |
| Sub-1 ns response | Prevents overshoot-induced latch-up or gate oxide damage in MOSFET drivers and RS-485 transceivers. |
Applications
| Industrial Power Supply Input Protection | Telecom Line Card Surge Suppression |
|---|---|
Use Scenario: 48 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and field wiring surges. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between +48 V rail and chassis ground, conducting only during negative-going transients. Use Value: Limits transient voltage to ≤125 V, preventing damage to upstream rectifier diodes and downstream DC-DC controllers rated for 130 V max input. |
Use Scenario: T1/E1 interface card in central office equipment subjected to lightning-induced longitudinal surges on twisted-pair lines. IC Role / Device Role / Timing Role: Primary protection element across tip/ring differential pair, referenced to isolated ground plane per UL 497B requirements. Use Value: Absorbs 1500 W surge energy while maintaining clamping below 125 V, preserving signal integrity and avoiding false triggering of line drivers. |
| Medical Equipment AC/DC Adapter Input | Automotive Aftermarket Infotainment Power Rail |
Use Scenario: Secondary-side 24 V output of medical-grade AC/DC adapter powering patient monitoring sensors. IC Role / Device Role / Timing Role: Final-stage transient suppressor on low-voltage DC output, guarding against coupling from internal switching noise or external ESD events. Use Value: Provides Class 3 ESD immunity (>16 kV HBM) and <5 µA leakage, ensuring no interference with microvolt-level sensor signals or battery backup circuits. |
Use Scenario: 12 V power input of aftermarket head unit connected to vehicle battery subject to load dump (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Standalone TVS on main power entry, sized to handle 1500 W peak without derating due to ambient temperature rise. Use Value: Clamps load dump spikes to 125 V, protecting automotive-grade SoCs and audio amplifiers rated for 135 V absolute maximum, with no PCB layout redesign needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ90A | Same VRWM (77.4 V), lower PPK (400 W), SMC package (surface-mount) | Requires PCB re-layout; suitable for space-constrained designs but not drop-in replacement for axial leads. | Select when board real estate is limited and surge requirements are ≤400 W; verify thermal pad design for 75°C ambient derating. |
| STMicroelectronics SMF90A | Lower PPK (200 W), same SOD-123 package, tighter VBR tolerance (±5%) | Not suitable for 1500 W IEC 61000-4-5 testing; intended for board-level ESD only. | Choose only for secondary-level ESD protection near connectors; avoid where primary surge absorption is required. |
Compared with 1N6294A, SMAJ90A offers surface-mount compatibility but sacrifices 73% peak power handling, while SMF90A provides tighter voltage control at the cost of inadequate surge robustness-making 1N6294A the sole choice for high-energy industrial and telecom primary protection.
Availability
1N6294A is available at Aetrix Electronics and suitable for industrial power supplies, telecom infrastructure equipment, and medical device power modules requiring stable component supply and long-term lifecycle support.
Supply support for 1N6294A 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
ON Semiconductor (now onsemi) is a global semiconductor manufacturer specializing in power management, analog, sensor, and discrete devices for automotive, industrial, cloud, and medical markets.
The 1N6294A belongs to the 1N6267A Series Mosorb TVS family, engineered specifically for high-reliability, high-energy transient suppression in harsh electromagnetic environments where UL recognition and repeatable clamping performance are mandatory.
FAQ
What is the maximum clamping voltage of the 1N6294A under full-rated surge conditions?
The 1N6294A clamps to a maximum of 125 V when subjected to its rated 12 A peak pulse current (IPP), as specified in the Electrical Characteristics table on page 3 of the ON Semiconductor datasheet. This value is measured using the standardized 1 ms exponential pulse waveform (Figure 5), and represents the highest voltage the protected circuit will experience during a worst-case transient event. Designers must ensure all downstream components have absolute maximum voltage ratings exceeding 125 V to guarantee reliability.
Does the 1N6294A meet UL 497B certification, and what does that mean for my design?
Yes, the 1N6294A is UL 497B recognized (File #116110, QVGV2 category) for isolated loop circuit protection. This certification verifies compliance with rigorous tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance-specifically for surge protectors used in telecom and industrial isolation barriers. Using the 1N6294A eliminates the need for additional system-level re-certification when implementing isolated data or power interfaces.
Can the 1N6294A be used in bidirectional protection configurations?
No, the 1N6294A is strictly unidirectional and must be connected with cathode to the protected line and anode to ground. For bidirectional protection, ON Semiconductor offers the 1.5KE91CA (same voltage rating, symmetrical clamping), which is tested in both polarities and designated with a "CA" suffix. Substituting 1N6294A in a bidirectional circuit will result in forward conduction and failure during positive transients.
What is the thermal resistance junction-to-lead (RJL) of the 1N6294A, and how does it affect power derating?
The 1N6294A has a thermal resistance of 20°C/W from junction to lead (RJL), as stated in the Maximum Ratings table. This value governs steady-state power dissipation: at lead temperature (TL) ≤ 75°C, it supports 5.0 W continuous power, derating linearly above that point (20 mW/°C). Unlike transient surge ratings, this parameter applies only to sustained DC or low-frequency leakage currents-not to the 1500 W pulse rating, which is thermally dominated by short-duration energy absorption.
How does the 1N6294A's response time impact protection of high-speed digital interfaces?
The 1N6294A achieves a typical response time of less than 1 ns, enabling effective protection of high-speed digital interfaces such as RS-485, CAN FD, or Ethernet PHYs against ESD and fast-rising transients. However, real-world performance depends critically on PCB layout: trace inductance dominates delay and overshoot, so the 1N6294A must be placed within 5 mm of the protected connector or IC pin, with direct ground-plane connection via multiple vias. Without this, the effective clamping may lag by several nanoseconds, risking latch-up or damage.
1N6294A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-201AD, Axial
- Series:
- Mosorb™
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 77.8V
- Voltage - Breakdown (Min):
- 86.5V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1N6294A FAQ
1.How can I place an order for 1N6294A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6294A 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 1N6294A reliable?
The price and inventory of 1N6294A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6294A is usually 5 days.
3.What payment methods are accepted for 1N6294A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6294A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6294A?
1N6294A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6294A 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 1N6294A?
For technical support, including 1N6294A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6294A requirements.
6.How does Aetrix verify that 1N6294A is sourced from the original manufacturer or authorized distributors?
All 1N6294A 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 1N6294A meets industry standards.
7.What is the process for return or replacement of 1N6294A?
All 1N6294A units undergo pre-shipment inspection (PSI). If there is an issue with 1N6294A, 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 1N6294A part is unused and in its original packaging.
Return procedure for 1N6294A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6294A Tags
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