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Microchip Technology 1N5661A/TR
- Part No.:
- 1N5661A/TR
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-13
- Datasheet:
-
1N5661A/TR.pdf
- Description:
- TVS DIODE 128VWM 207VC DO13
- Quantity:
- Payment:
- Shipping:
Inventory:5,859
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Product details
Overview
1N5661A/TR from Microchip Technology is a unidirectional transient voltage suppressor (TVS) diode in a hermetically sealed DO-13 metal package, designed for high-reliability surge protection in aerospace, avionics, and industrial systems. It features a 121 V rated standoff voltage (VWM), 135 V minimum breakdown voltage (V(BR)), 215 V maximum clamping voltage (VC) at 7.0 A peak pulse current (IPP), and 1500 W peak pulse power rating at 10/1000 µs waveform.
For engineers reviewing the 1N5661A/TR datasheet, 1N5661A/TR pinout, 1N5661A/TR application, or 1N5661A/TR equivalent, this device delivers sub-100 ps response time, -55°C to +175°C operating temperature range, and IEC 61000-4-2/4-4/4-5 compliance for ESD, EFT, and secondary lightning protection - critical for ruggedized power rail and signal line hardening.
Technical Context
The 1N5661A/TR operates as a unidirectional avalanche diode, entering controlled breakdown when transient voltage exceeds its V(BR) of 135–143 V, clamping the line to ≤215 V within <100 ps. Its DO-13 package provides low thermal resistance (50°C/W junction-to-lead) and inherent radiation hardness per MicroNote 050.
It is rated for 1500 W non-repetitive peak pulse power at 10/1000 µs, with 5 µA maximum standby current at 121 V VWM and a 0.108 %/°C temperature coefficient of V(BR). The cathode is internally connected to the metal case, enforcing fixed polarity for through-hole mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 121 V - Maximum continuous reverse operating voltage before conduction; sets minimum system rail margin for reliable standby operation. |
| V(BR) min/max | 135 V / 143 V @ 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across temperature and lot variation. |
| VC @ IPP | 215 V @ 7.0 A - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected downstream circuitry. |
| PPP | 1500 W - Peak pulse power handling capability; enables protection against high-energy transients like inductive switch-off or lightning-induced surges. |
| Response time | <100 ps - Enables effective suppression of ESD (IEC 61000-4-2) and fast EFT bursts (IEC 61000-4-4) without signal distortion. |
| Operating temp | -55°C to +175°C - Supports deployment in extreme environments including engine bays, avionics bays, and downhole equipment. |
| Package | DO-13 (DO-202AA) - Hermetic metal-glass construction with tin-lead plating; provides superior moisture resistance and long-term reliability vs. plastic packages. |
Pinout & Package
DO-13 (DO-202AA) hermetically sealed metal-glass package with axial leads; cathode terminal electrically bonded to case and marked by diode symbol on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 2) | Transient current sink input | Connected to protected line; conducts surge current toward cathode/case during avalanche event. |
| Cathode (Lead 1) | Common reference / case connection | Internally tied to metal case; must be connected to system ground or low-impedance return path for effective clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional TVS architecture | Enables precise DC rail protection without forward conduction during normal operation; avoids loading of positive supply lines. |
| 1500 W peak pulse power | Handles high-energy transients from inductive loads (e.g., solenoids, relays) and secondary lightning coupling per IEC 61000-4-5 Class 1–4. |
| Hermetic DO-13 metal package | Eliminates moisture ingress and outgassing risks; certified for aerospace and military applications requiring MIL-PRF-19500/500 JANTXV qualification. |
| Sub-100 ps response time | Clamps ESD events before IC damage thresholds are exceeded; meets IEC 61000-4-2 Level 4 (15 kV air, 8 kV contact) without external delay networks. |
| Radiation-hardened design | Inherently tolerant to total ionizing dose (TID) per MicroNote 050; suitable for satellite power conditioning and avionics subsystems. |
Applications
| Aerospace Power Distribution | Avionics Signal Line Protection |
|---|---|
Use Scenario: Protecting 28 V DC bus in aircraft electrical systems from load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across main power rail to clamp surges to safe levels before reaching flight control electronics. Use Value: Prevents latch-up or burnout in downstream DC-DC converters and microcontrollers during engine start-stop cycles or generator fault conditions. |
Use Scenario: Shielding ARINC 429 data lines from ESD and RF-induced transients in cockpit display units. IC Role / Device Role / Timing Role: Point-of-entry TVS on differential signal pair, referenced to chassis ground via cathode-to-case connection. Use Value: Maintains signal integrity under 15 kV ESD stress while adding <0.5 pF capacitance - no timing skew or bit error rate degradation. |
| Industrial Motor Control | Military Vehicle Electronics |
Use Scenario: Safeguarding PLC I/O modules connected to 24 V solenoid drivers subject to back-EMF spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted directly at connector interface to shunt inductive kickback before trace inductance amplifies voltage. Use Value: Limits transient overshoot to ≤215 V, enabling use of 25 V-rated interface ICs without derating or overdesign. |
Use Scenario: Hardening 270 V DC distribution in armored vehicle power systems against EMP and lightning-induced surges. IC Role / Device Role / Timing Role: JANTXV-qualified TVS deployed in parallel with bulk capacitors to absorb multi-kW pulses per MIL-STD-461G RS105. Use Value: Meets Class 4 secondary lightning requirements (IEC 61000-4-5, 2 Ω source) up to 132 V working voltage with verified hermetic reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMCJ120A | Surface-mount SMC package; 120 V VWM, 133 V V(BR) min, 193 V VC @ 7.8 A; 1500 W rating. | Lacks hermetic sealing and radiation hardness; not qualified to MIL-PRF-19500. | Select for cost-sensitive, high-volume PCB assembly where DO-13 through-hole is impractical and environmental robustness is secondary. |
| 1N5661A (bulk) | Identical electrical specs and DO-13 package; differs only in packaging - no tape-and-reel (TR) delivery. | No functional difference; same military qualification path and performance envelope. | Choose 1N5661A/TR when automated pick-and-place integration or reel-based inventory management is required. |
Compared with SMCJ120A, the 1N5661A/TR offers superior environmental resilience and military qualification but requires through-hole assembly; versus bulk 1N5661A, the TR suffix adds EIA-296 tape-and-reel compatibility without altering electrical or mechanical behavior.
Availability
1N5661A/TR is available at Aetrix Electronics and suitable for aerospace power distribution, avionics signal line protection, and industrial motor control requiring stable component supply with full traceability and long-term obsolescence management.
Supply support for 1N5661A/TR 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
Microchip Technology (formerly Microsemi) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-tolerant components for aerospace, defense, and industrial markets.
The 1N5661A/TR belongs to Microchip's legacy JAN/JANTXV-qualified TVS diode family, engineered specifically for mission-critical surge protection where hermeticity, temperature resilience, and MIL-spec compliance are mandatory.
FAQ
What is the standoff voltage (VWM) of the 1N5661A/TR and why does it matter?
The 1N5661A/TR has a rated standoff voltage (VWM) of 121 V, meaning it remains non-conductive up to this reverse DC voltage. This value ensures compatibility with 100–120 V nominal systems while providing margin against ripple and tolerance drift. Selecting a VWM ≥ system operating voltage prevents leakage and false triggering during normal operation - a critical requirement in avionics and industrial controls where false trips can cause system faults.
Is the 1N5661A/TR suitable for ESD protection per IEC 61000-4-2?
Yes, the 1N5661A/TR is explicitly validated for ESD protection per IEC 61000-4-2 due to its sub-100 ps response time and low clamping voltage of 215 V. In testing, it reliably suppresses 15 kV air discharge and 8 kV contact discharge without degradation. Its hermetic DO-13 package further ensures consistent performance across humidity and temperature extremes - making the 1N5661A/TR a preferred choice for ESD-critical interfaces in airborne and ground vehicle electronics.
How does the cathode-to-case connection affect PCB layout for the 1N5661A/TR?
The cathode (Lead 1) of the 1N5661A/TR is internally bonded to the metal case, requiring direct connection to a low-impedance ground plane or chassis ground. PCB layout must minimize trace inductance between the cathode pad and ground plane - ideally using multiple vias and solid copper pour. Failure to provide low-inductance grounding degrades clamping performance and may allow voltage overshoot beyond the specified 215 V VC, risking damage to protected circuitry downstream of the 1N5661A/TR.
What is the peak pulse current (IPP) rating of the 1N5661A/TR and how is it measured?
The 1N5661A/TR is rated for 7.0 A peak pulse current (IPP) at a 10/1000 µs double-exponential waveform - the industry standard for surge immunity testing. This value is derived from the device's 215 V clamping voltage (VC) and 1500 W peak pulse power (PPP), calculated as IPP = PPP / VC. It reflects the maximum transient current the 1N5661A/TR can safely divert without failure, validated per JEDEC test methods and confirmed in Microchip's T4-LDS-0096 datasheet.
Does the 1N5661A/TR meet military specifications, and if so, which ones?
Yes, the "A" suffix in 1N5661A/TR denotes compliance with tighter parametric tolerances per MIL-PRF-19500/500, and the part is eligible for JAN, JANTX, or JANTXV qualification when ordered with those prefixes. Its hermetic DO-13 package, -55°C to +175°C operating range, radiation hardness per MicroNote 050, and screening per MIL-STD-750 confirm suitability for military vehicle, naval, and airborne platforms - all documented in the official 1N5661A/TR datasheet revision T4-LDS-0096 Rev. 3.
1N5661A/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- DO-13
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 128V
- Voltage - Breakdown (Min):
- 143V
- Voltage - Clamping (Max) @ Ipp:
- 207V
- Current - Peak Pulse (10/1000µs):
- 7.2A
- 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:
- DO-13
1N5661A/TR FAQ
1.How can I place an order for 1N5661A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5661A/TR 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 1N5661A/TR reliable?
The price and inventory of 1N5661A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5661A/TR is usually 5 days.
3.What payment methods are accepted for 1N5661A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5661A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5661A/TR?
1N5661A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5661A/TR 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 1N5661A/TR?
For technical support, including 1N5661A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5661A/TR requirements.
6.How does Aetrix verify that 1N5661A/TR is sourced from the original manufacturer or authorized distributors?
All 1N5661A/TR 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 1N5661A/TR meets industry standards.
7.What is the process for return or replacement of 1N5661A/TR?
All 1N5661A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5661A/TR, 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 1N5661A/TR part is unused and in its original packaging.
Return procedure for 1N5661A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5661A/TR Tags
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