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Microchip Technology 1PMT5946E3/TR13
- Part No.:
- 1PMT5946E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5946E3/TR13.pdf
- Description:
- DIODE ZENER 75V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,827
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Product details
Overview
1PMT5946E3/TR13 from Microsemi is a 75 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 140 Ω dynamic impedance at 5.0 mA test current and 2000 µA max reverse leakage at 56 V, used for precision voltage regulation in space-constrained power supply rails.
For engineers reviewing the 1PMT5946E3/TR13 datasheet, 1PMT5946E3/TR13 pinout, 1PMT5946E3/TR13 application, or 1PMT5946E3/TR13 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (30°C/W junction-to-TAB), ESD robustness (>16 kV HBM), low knee impedance, and compatibility with automated SMT assembly per EIA-481 tape-and-reel packaging.
Technical Context
This Zener diode operates as a two-terminal voltage reference device, leveraging silicon PN-junction avalanche breakdown to maintain stable 75 V across its terminals under reverse bias. Its Powermite® package integrates a full metallic bottom and locking tab to enhance thermal conduction and mechanical retention during reflow.
Electrical behavior is defined at TL = 30°C with IZT = 5.0 mA; voltage regulation is specified with ±5% tolerance, and dynamic impedance (ZZT = 140 Ω) reflects small-signal AC resistance near the operating point. Reverse leakage remains ≤2000 µA up to VR = 56 V, supporting reliable clamping in overvoltage protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 75 V ±5% at IZT = 5.0 mA - defines nominal regulation point with tight production control |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - sets maximum continuous power handling with thermal derating above 60°C |
| Dynamic Impedance | 140 Ω at IZT = 5.0 mA - determines output voltage variation under load current changes |
| Reverse Leakage | ≤2000 µA at VR = 56 V - ensures low standby current in high-impedance bias networks |
| Thermal Resistance | 30°C/W junction-to-TAB1 - quantifies thermal path efficiency for PCB copper pad heat sinking |
| ESD Rating | >16 kV per Human Body Model - supports robust handling in unshielded manufacturing environments |
| Knee Current | 0.25 mA at VZK - specifies minimum current needed to enter stable regulation region |
Pinout & Package
Package: Powermite® surface-mount molded package with full metallic bottom and integral locking tab; cathode designated by TAB 1; mounting position unrestricted; weight ≈ 0.016 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary heat sink interface and electrical cathode connection; must be soldered to copper pour for thermal management |
| Lead 2 | Anode | Standard anode terminal; reverse-biased during Zener operation; connects to lower-potential node in regulation circuit |
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-216 |
| Integral heat sink locking tab | Improves mechanical retention and thermal transfer to PCB copper without external heatsink |
| Full metallic bottom | Eliminates solder flux entrapment risk during assembly, improving long-term reliability and void-free solder joints |
| ESD robustness >16 kV HBM | Reduces need for upstream ESD protection in board-level design, lowering BOM count |
| Low knee impedance (ZZK) | Ensures stable regulation onset at low currents (IZK = 0.25 mA), critical for low-power bias applications |
Applications
| Industrial Power Supply Regulation | Automotive ECUs – Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for feedback loops in isolated DC-DC converters operating at 75 V input rails. IC Role / Device Role / Timing Role: Zener diode acting as primary shunt regulator and voltage clamp in secondary-side sensing circuitry. Use Value: Maintains ±5% output voltage accuracy across temperature and load, enabled by 140 Ω ZZT and 30°C/W thermal resistance. | Use Scenario: Protecting microcontroller I/O pins and sensor interfaces against load-dump transients up to 80 V in 24 V vehicle systems. IC Role / Device Role / Timing Role: Fast-acting voltage clamp placed between supply rail and ground, triggered above 75 V threshold. Use Value: Limits transient peak to safe levels using 2000 µA IR at 56 V and >16 kV HBM robustness for assembly survivability. |
| Telecom Line Card Biasing | Test Equipment – Precision Reference |
Use Scenario: Providing stable bias voltage for op-amp comparators and analog front-end stages in modular line cards. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference sourcing minimal current (<0.25 mA) in high-impedance networks. Use Value: Achieves regulation onset at IZK = 0.25 mA, enabling accurate biasing without loading sensitive signal paths. | Use Scenario: Serving as calibrated voltage standard in benchtop multimeters and calibration sources requiring traceable 75 V references. IC Role / Device Role / Timing Role: Primary shunt reference element in closed-loop calibration circuit with active temperature compensation. Use Value: Delivers ±5% initial tolerance and stable VZ drift performance supported by low ZZT and controlled thermal path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5946B | Same 75 V VZ and ±5% tolerance, but in DO-41 axial package; higher thermal resistance (~65°C/W) and no metallic bottom | Requires through-hole assembly and larger board area; unsuitable for high-density SMT layouts | Select 1PMT5946E3/TR13 when automated SMT, thermal performance, or space constraints dominate; choose 1N5946B only for legacy through-hole designs. |
| SMBJ75A | TVS diode with 75 V standoff voltage (VRWM), not a Zener; higher clamping voltage (VC = 121 V at IPP), designed for surge suppression | Intended for transient protection, not precision regulation; cannot replace 1PMT5946E3/TR13 in voltage reference roles | Use SMBJ75A only for lightning/ESD surge clamping; retain 1PMT5946E3/TR13 for stable DC regulation or low-current biasing. |
Compared with 1N5946B and SMBJ75A, the 1PMT5946E3/TR13 uniquely combines SMT compatibility, 3.0 W power handling in a miniature package, and precise 75 V regulation-making it irreplaceable where thermal efficiency, automated assembly, and voltage accuracy are jointly required.
Availability
1PMT5946E3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECU protection circuits, telecom line card biasing, and precision test equipment requiring stable component supply and consistent parametric performance.
Supply support for 1PMT5946E3/TR13 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 semiconductor manufacturer specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The Powermite® Zener series-including 1PMT5946E3/TR13-is engineered for high-power density voltage regulation in compact SMT layouts, targeting applications demanding thermal efficiency, automated assembly readiness, and ruggedized electrical performance.
FAQ
What is the Zener voltage tolerance for 1PMT5946E3/TR13?
The 1PMT5946E3/TR13 has a standard Zener voltage tolerance of ±5% at 75 V, measured at IZT = 5.0 mA and TAB temperature of 30°C. Tighter tolerances (±2%, ±1%) are available with suffixes C and D respectively, but the E3/TR13 variant uses the standard ±5% grade confirmed in the MSC0995 datasheet revision F.
How is thermal management handled for 1PMT5946E3/TR13 in PCB layout?
Thermal management for 1PMT5946E3/TR13 relies on soldering TAB 1-the cathode terminal-to a copper pour or thermal pad on the PCB. With a junction-to-TAB thermal resistance of 30°C/W, adequate copper area must be provided to dissipate up to 3.0 W at TAB temperatures ≤60°C. The full metallic bottom and locking tab enhance conduction without requiring additional heatsinks.
Is 1PMT5946E3/TR13 compatible with lead-free reflow processes?
Yes, 1PMT5946E3/TR13 is qualified for lead-free reflow per J-STD-020. Its Powermite® package withstands peak temperatures up to 260°C, and the full metallic bottom prevents flux entrapment-critical for void-free solder joints in Pb-free assembly. The device is supplied in EIA-481-compliant tape-and-reel (TR13 = 13-inch reel, 12,000 pieces).
What is the maximum reverse leakage current for 1PMT5946E3/TR13?
The maximum reverse leakage current for 1PMT5946E3/TR13 is 2000 µA at VR = 56 V, as specified in the MSC0995 datasheet. This value is measured at TL = 30°C and confirms stable blocking behavior below the Zener knee, supporting use in high-impedance bias networks where leakage-induced error must be minimized.
Can 1PMT5946E3/TR13 be used as a substitute for 1N5946B in existing designs?
No direct substitution is recommended without layout and thermal redesign. While both share 75 V Zener voltage and ±5% tolerance, 1PMT5946E3/TR13 uses a surface-mount Powermite® package with TAB 1 cathode and 30°C/W thermal resistance, whereas 1N5946B is axial DO-41 with ~65°C/W. PCB footprint, thermal path, and assembly process differ fundamentally.
1PMT5946E3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-216AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 75 V
- Tolerance:
- ±20%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 140 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 56 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
1PMT5946E3/TR13 FAQ
1.How can I place an order for 1PMT5946E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5946E3/TR13 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 1PMT5946E3/TR13 reliable?
The price and inventory of 1PMT5946E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5946E3/TR13 is usually 5 days.
3.What payment methods are accepted for 1PMT5946E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5946E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5946E3/TR13?
1PMT5946E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5946E3/TR13 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 1PMT5946E3/TR13?
For technical support, including 1PMT5946E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5946E3/TR13 requirements.
6.How does Aetrix verify that 1PMT5946E3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1PMT5946E3/TR13 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 1PMT5946E3/TR13 meets industry standards.
7.What is the process for return or replacement of 1PMT5946E3/TR13?
All 1PMT5946E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5946E3/TR13, 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 1PMT5946E3/TR13 part is unused and in its original packaging.
Return procedure for 1PMT5946E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5946E3/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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