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Microchip Technology 1PMT5951A/TR7
- Part No.:
- 1PMT5951A/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5951A/TR7.pdf
- Description:
- DIODE ZENER 120V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,941
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Product details
Overview
1PMT5951A/TR7 from Microsemi is a 120 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 380 Ω dynamic impedance at 3.1 mA test current and 4500 µA max reverse leakage at 91.2 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails of industrial power supplies.
For engineers reviewing the 1PMT5951A/TR7 datasheet, 1PMT5951A/TR7 pinout, 1PMT5951A/TR7 application, or 1PMT5951A/TR7 equivalent, key selection criteria include its 120 V nominal Zener voltage, 3.0 W thermal capability with metallic-tab heat sinking, ESD rating >16 kV HBM, DO-216 mechanical outline, and compatibility with EIA-481 tape-and-reel automated assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation across varying load currents. Its Powermite® package integrates a full metallic bottom (TAB 1) for solder joint reliability and a locking tab that functions as an integral heatsink, reducing junction-to-tab thermal resistance to 30°C/W.
The device exhibits low knee impedance (ZZK = 0.25 Ω) and tight reverse leakage control (IR ≤ 4500 µA at VR = 91.2 V), enabling stable clamping in transient suppression circuits. Zener voltage is specified at IZT = 3.1 mA with measurement performed 20 seconds after DC current application per Note 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 120 V ±5% at IZT = 3.1 mA - defines precise clamping threshold for overvoltage protection |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - enables high-energy transient absorption without derating in compact SMT layout |
| Dynamic Impedance (ZZT) | 380 Ω at IZT - ensures minimal voltage shift under small-signal current variations |
| Reverse Leakage (IR) | ≤4500 µA at VR = 91.2 V - guarantees low standby power loss in always-on protection circuits |
| Thermal Resistance | 30°C/W junction-to-TAB1 - allows direct thermal coupling to PCB copper pour or heatsink via metallic tab |
| ESD Rating | >16 kV HBM - provides robust handling margin during automated PCB assembly and field operation |
| Knee Impedance (ZZK) | 0.25 Ω - supports stable regulation even near breakdown onset, critical for low-current biasing |
Pinout & Package
Package: Powermite® (DO-216), molded surface-mount case with full metallic bottom (TAB 1) acting as cathode terminal and primary thermal path. Cathode designated by TAB 1; mounting orientation unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary current return path and thermal interface - must be soldered to ≥100 mm² copper area for rated 3.0 W dissipation |
| Lead 2 | Anode | Signal input terminal - connects to protected node or reference source; no thermal function |
Key Features
| Feature | Design Value |
|---|---|
| Integral heat sink locking tab | Mechanically anchors device during reflow and conducts heat directly from junction to PCB via TAB 1 |
| Full metallic bottom | Eliminates solder flux entrapment risk and ensures void-free solder joints for long-term thermal reliability |
| Automated insertion compatibility | Designed for EIA-481 tape-and-reel (7″/3,000 pcs; 13″/12,000 pcs) and pick-and-place placement |
| Tight Zener tolerance option | Available in ±2% (suffix C) and ±1% (suffix D) - supports high-accuracy reference designs beyond standard ±5% |
Applications
| Industrial Power Supply Clamping | Programmable Logic Controller (PLC) I/O Protection |
|---|---|
Use Scenario: Clamp 120 V DC bus transients caused by relay switching or inductive load turn-off in DIN-rail mounted PSUs. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to shunt excess energy into ground plane. Use Value: 3.0 W power rating and 30°C/W thermal resistance enable sustained clamping without thermal runaway at ambient up to +85°C. | Use Scenario: Protect 24 V digital input channels from accidental 120 V miswiring or surge coupling in modular PLC backplanes. IC Role / Device Role / Timing Role: Standby overvoltage limiter placed between field input and optocoupler input stage. Use Value: 4500 µA max IR at 91.2 V ensures negligible loading on 24 V logic while clamping >100 V faults within microseconds. |
| Telecom Line Card Surge Suppression | Test Equipment Reference Stability |
Use Scenario: Secondary protection stage downstream of gas discharge tube (GDT) on -48 V telecom line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response Zener clamp limiting let-through voltage to <130 V during 10/1000 µs transients. Use Value: 120 V nominal VZ aligns with ITU-T K.20 coordination requirements; >16 kV HBM ESD rating prevents EOS damage during board handling. | Use Scenario: Precision voltage reference for calibration circuitry in portable multimeters requiring stable 120 V reference point. IC Role / Device Role / Timing Role: Zener-based shunt reference providing temperature-stable DC output under light load. Use Value: ±5% tolerance and 380 Ω ZZT ensure reference drift <±0.5 V over 0–5 mA load range at 30°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor 1N5375B | 120 V, 5 W, DO-201AD package, 150°C max junction temp, 500 mW derated above 50°C | Higher power but larger through-hole footprint; lacks metallic-tab thermal path and automated SMT compatibility | Select when higher continuous power (>3 W) is required and board space permits axial leaded layout |
| Vishay SZ1SMA5951E-TR | 120 V, 1.5 W, SMA package, 30°C/W junction-to-case, ±5% tolerance, RoHS-compliant | Lower power rating and smaller thermal mass; suitable only for intermittent clamping, not sustained 3 W loads | Select for cost-sensitive consumer designs where peak pulse energy is low and thermal budget is constrained |
Compared with 1PMT5951A/TR7, the 1N5375B offers greater power headroom but requires manual or wave soldering and occupies more board area, while the SZ1SMA5951E-TR reduces size and cost at the expense of thermal performance and continuous clamping capability.
Availability
1PMT5951A/TR7 is available at Aetrix Electronics and suitable for industrial power supplies, programmable logic controller (PLC) I/O modules, telecom line cards, and test equipment requiring stable component supply with full traceability and lifecycle management.
Supply support for 1PMT5951A/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 RF solutions for aerospace, defense, and industrial markets.
The Powermite® Zener diode product line delivers high-power surface-mount voltage regulation in miniature packages, designed specifically for space-constrained, thermally demanding applications such as base station power systems and ruggedized control hardware.
FAQ
What is the maximum continuous power dissipation for 1PMT5951A/TR7?
The 1PMT5951A/TR7 is rated for 3.0 W DC power dissipation when TAB 1 is maintained at 60°C. This assumes proper thermal design - TAB 1 must be soldered to ≥100 mm² of 2 oz copper to achieve the specified 30°C/W junction-to-tab thermal resistance. Derating is required above 60°C tab temperature per the device's thermal curve.
How is the cathode identified on the 1PMT5951A/TR7 package?
The cathode of the 1PMT5951A/TR7 is designated by TAB 1 - the full metallic bottom surface of the Powermite® package. This is confirmed in the Mechanical Characteristics section of the MSC0995.PDF datasheet. Lead 2 is the anode. No polarity marking appears on the molded body; orientation is defined solely by tab position and lead assignment.
Does 1PMT5951A/TR7 meet any specific ESD standards?
Yes, the 1PMT5951A/TR7 has an ESD rating of >16 kV per the Human Body Model (HBM), as stated in the FEATURES section of the MSC0995.PDF datasheet. This exceeds JEDEC JS-001 Class 3B (8 kV) and supports robust handling during automated assembly and field deployment without additional protection circuitry.
Can 1PMT5951A/TR7 be used in place of through-hole Zeners like 1N5375B?
No - the 1PMT5951A/TR7 is not a drop-in replacement for 1N5375B due to fundamental differences in package, thermal path, and mounting method. While both are 120 V Zeners, the 1PMT5951A/TR7 uses a surface-mount Powermite® package with TAB 1 as cathode and thermal interface, whereas 1N5375B is axial-leaded DO-201AD. PCB layout and thermal design must be re-evaluated.
What is the Zener test current and how is voltage measured for 1PMT5951A/TR7?
The Zener voltage of 1PMT5951A/TR7 is measured at a test current (IZT) of 3.1 mA, with voltage reading taken exactly 20 seconds after DC current application, as specified in Note 1 of the Electrical Characteristics table. This timing accounts for thermal stabilization and avoids self-heating errors during measurement.
1PMT5951A/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):
- 120 V
- Tolerance:
- ±10%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 380 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 91.2 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
1PMT5951A/TR7 FAQ
1.How can I place an order for 1PMT5951A/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5951A/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 1PMT5951A/TR7 reliable?
The price and inventory of 1PMT5951A/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5951A/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5951A/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5951A/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5951A/TR7?
1PMT5951A/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5951A/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 1PMT5951A/TR7?
For technical support, including 1PMT5951A/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5951A/TR7 requirements.
6.How does Aetrix verify that 1PMT5951A/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5951A/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 1PMT5951A/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5951A/TR7?
All 1PMT5951A/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5951A/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 1PMT5951A/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5951A/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5951A/TR7 Tags
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