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Microchip Technology 1PMT5955A/TR7
- Part No.:
- 1PMT5955A/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5955A/TR7.pdf
- Description:
- DIODE ZENER 180V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,952
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Product details
Overview
1PMT5955A/TR7 from Microsemi is a 180 V, ±5% tolerance surface-mount Zener diode in the Powermite® package, rated for 3.0 W DC power dissipation at TAB 1 = 60°C, with 900 Ω dynamic impedance at 2.1 mA test current and 136.8 mA maximum Zener current - used for precision voltage regulation and overvoltage protection in industrial power supplies.
For engineers reviewing the 1PMT5955A/TR7 datasheet, 1PMT5955A/TR7 pinout, 1PMT5955A/TR7 application, or 1PMT5955A/TR7 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (30°C/W junction-to-TAB1), ESD rating (>16 kV HBM), reverse leakage (<7000 µA at 144 V), and compatibility with automated SMT assembly.
Technical Context
This device operates as a single-terminal voltage reference with cathode designated by TAB 1, requiring no external biasing circuitry. Its full metallic bottom and integral heat sink locking tab enable direct thermal conduction to the PCB, supporting stable regulation under transient load conditions.
The 1PMT5955A/TR7 exhibits tight knee characteristics (IZK = 0.25 mA, ZZK = 1200 Ω) and low reverse leakage (≤7000 µA at VR = 144 V), making it suitable for low-power standby regulation where leakage-sensitive circuits demand predictable turn-on behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 180 V ±5% at IZT = 2.1 mA - defines nominal clamping level for overvoltage protection |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - sets maximum continuous thermal load on PCB copper area |
| Dynamic Impedance (ZZT) | 900 Ω at IZT = 2.1 mA - determines regulation sensitivity to current variation |
| Thermal Resistance | 30°C/W junction-to-TAB1 - quantifies temperature rise per watt dissipated into mounting pad |
| ESD Rating | >16 kV per Human Body Model - ensures robustness during handling and board assembly |
| Reverse Leakage (IR) | ≤7000 µA at VR = 144 V - limits standby current in high-impedance sensing paths |
| Max Zener Current (IZM) | 136.8 mA - establishes upper limit for safe DC conduction without thermal runaway |
Pinout & Package
Package: Powermite® surface-mount molded package with full metallic bottom and integral heat sink locking tab; cathode identified by TAB 1; DO-216 outline; weight ≈ 0.016 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary thermal and electrical connection point; must be soldered to copper pour for heat dissipation and circuit return path |
| Lead 2 | Anode | Standard anode terminal; mounted opposite TAB 1; requires standard SMT pad layout per DO-216 mechanical drawing |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount Powermite® package | Enables automated placement and reflow while delivering 3.0 W power handling in footprint smaller than DO-41 |
| Full metallic bottom | Eliminates solder flux entrapment during reflow, improving long-term reliability of solder joints |
| Integral heat sink locking tab | Provides mechanical anchoring and direct thermal path from junction to PCB, reducing thermal resistance by ~40% vs. standard SOD-123 |
| ESD robustness | >16 kV HBM rating allows safe handling without special ESD controls in standard production environments |
Applications
| Industrial Power Supply Regulation | Automotive ECU Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage in isolated flyback auxiliary supplies for PLC I/O modules. IC Role / Device Role / Timing Role: Zener diode providing precise 180 V clamp to protect optocoupler feedback circuitry from transients. Use Value: Tight 5% VZ tolerance and low 7000 µA IR at 144 V ensure minimal drift and leakage-induced error in feedback loop. | Use Scenario: Suppressing load-dump spikes on 24 V CAN bus power rails in commercial vehicle ECUs. IC Role / Device Role / Timing Role: Primary overvoltage clamp absorbing 3.0 W surge energy during ISO 7637-2 Pulse 5a events. Use Value: 30°C/W junction-to-TAB1 thermal resistance enables effective heat spreading into chassis-grounded copper, preventing thermal failure. |
| Medical Equipment HV Bias Supply | Test & Measurement Instrument Protection |
Use Scenario: Regulating bias voltage for photomultiplier tube (PMT) anode chains in portable X-ray detectors. IC Role / Device Role / Timing Role: High-voltage Zener reference establishing stable 180 V node across multi-stage resistive divider. Use Value: Low 0.25 mA knee current (IZK) ensures reliable conduction onset even under microamp-level leakage conditions. | Use Scenario: Protecting input front-end amplifiers in handheld multimeters exposed to accidental 200 V misconnection. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting input voltage to ≤180 V before op-amp rail damage occurs. Use Value: 900 Ω dynamic impedance maintains clamping accuracy within ±2 V across 1–10 mA fault currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5379B | Same 180 V nominal VZ, but DO-41 through-hole package; 3.0 W rating at 75°C ambient; higher thermal resistance (50°C/W) | Requires manual or wave-solder assembly; unsuitable for high-density SMT layouts | Select when legacy through-hole design or higher ambient operating temperature (>75°C) is required |
| SMBJ180A | TVS diode (not Zener); 180 V standoff, 200 V breakdown; 600 W peak pulse power; bidirectional | Designed for transient suppression only; not suitable for DC regulation or precision clamping | Select only for surge-only protection; avoid in voltage-reference or bias-regulation roles |
Compared with 1N5379B and SMBJ180A, the 1PMT5955A/TR7 uniquely combines SMT compatibility, low thermal resistance (30°C/W), and true Zener regulation capability - making it optimal for space-constrained, thermally demanding DC voltage reference designs.
Availability
1PMT5955A/TR7 is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU overvoltage clamp, and medical equipment HV bias supply requiring stable component supply and traceable sourcing.
Supply support for 1PMT5955A/TR7 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The Powermite® Zener diode product line was designed specifically for high-power-density surface-mount voltage regulation and transient protection in mission-critical power systems where thermal performance and assembly reliability are paramount.
FAQ
What is the Zener voltage tolerance for 1PMT5955A/TR7?
The 1PMT5955A/TR7 has a standard Zener voltage tolerance of ±5% at 180 V, measured at 2.1 mA test current with TAB 1 held at 30°C. Tighter tolerances (±2% and ±1%) are available as suffix C and D variants, but the /TR7 marking indicates the standard ±5% version. This tolerance directly impacts regulation accuracy in precision reference applications.
How is thermal management handled in the 1PMT5955A/TR7 package?
The 1PMT5955A/TR7 uses a Powermite® package with a full metallic bottom and integral heat sink locking tab that conducts heat directly from the junction to the PCB mounting pad. Its specified thermal resistance is 30°C/W junction-to-TAB1, meaning a 3.0 W dissipation causes a 90°C temperature rise above the pad temperature - requiring adequate copper area and thermal vias for reliable operation.
Is the 1PMT5955A/TR7 compatible with lead-free reflow processes?
Yes, the 1PMT5955A/TR7 is qualified for standard lead-free reflow profiles per JEDEC J-STD-020. Its molded Powermite® package withstands peak temperatures up to 260°C for 20–40 seconds. The full metallic bottom also minimizes voiding risk during reflow, supporting high-yield automated assembly without flux entrapment concerns.
What is the maximum reverse leakage current for 1PMT5955A/TR7 at rated voltage?
At reverse voltage VR = 144 V (80% of nominal 180 V), the 1PMT5955A/TR7 guarantees maximum reverse leakage current of 7000 µA. This value is critical for low-power standby circuits where excessive leakage could disrupt bias points or drain backup batteries - and is significantly lower than many generic 180 V Zeners in similar packages.
Does the 1PMT5955A/TR7 have polarity marking, and how is cathode identified?
Yes, the 1PMT5955A/TR7 cathode is unambiguously designated by TAB 1, which is the larger metallic terminal on the package. Mechanical drawings confirm TAB 1 as the cathode, and this is consistent across all 1PMT59xxB series devices. Correct orientation is essential - reverse mounting will prevent proper Zener conduction and may cause open-circuit failure in regulation paths.
1PMT5955A/TR7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-216AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 180 V
- Tolerance:
- ±10%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 800 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 136.8 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-216AA
1PMT5955A/TR7 FAQ
1.How can I place an order for 1PMT5955A/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5955A/TR7 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 1PMT5955A/TR7 reliable?
The price and inventory of 1PMT5955A/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5955A/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5955A/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5955A/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5955A/TR7?
1PMT5955A/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5955A/TR7 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 1PMT5955A/TR7?
For technical support, including 1PMT5955A/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5955A/TR7 requirements.
6.How does Aetrix verify that 1PMT5955A/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5955A/TR7 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 1PMT5955A/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5955A/TR7?
All 1PMT5955A/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5955A/TR7, 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 1PMT5955A/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5955A/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5955A/TR7 Tags
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MM5Z5V1ST1G
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