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Microchip Technology 1PMT5945B/TR7
- Part No.:
- 1PMT5945B/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5945B/TR7.pdf
- Description:
- DIODE ZENER 68V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,016
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Product details
Overview
1PMT5945B/TR7 from Microsemi is a 68 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 120 Ω dynamic impedance at 5.5 mA test current and 1700 µA max reverse leakage at 51.2 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails and regulator feedback networks.
For engineers reviewing the 1PMT5945B/TR7 datasheet, 1PMT5945B/TR7 pinout, 1PMT5945B/TR7 application, or 1PMT5945B/TR7 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (30°C/W junction-to-TAB), ESD rating (>16 kV HBM), low knee impedance, and compatibility with automated SMT assembly.
Technical Context
This device operates as a two-terminal voltage-regulating diode with sharp Zener breakdown at 68 V nominal. Its Powermite® package integrates a full metallic bottom and locking tab to enhance thermal conduction and mechanical stability during reflow.
Electrical behavior is defined at TL = 30°C with IZT = 5.5 mA; dynamic impedance (ZZT = 120 Ω) and knee impedance (ZZK = 1700 Ω at IZK = 0.25 mA) reflect stable regulation across load and line variations in low-power analog and power-supply circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 68 V ±5% - precise clamping threshold for 51–52 V regulated outputs or overvoltage protection triggers |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - supports sustained operation in compact, thermally constrained PCB layouts |
| Test Current | 5.5 mA - standard bias point for voltage measurement and regulation stability validation |
| Dynamic Impedance | 120 Ω at 5.5 mA - ensures minimal output voltage shift under small-signal load transients |
| Reverse Leakage | 1700 µA max at 51.2 V - defines worst-case quiescent current in high-impedance sensing paths |
| Thermal Resistance | 30°C/W junction-to-TAB - enables thermal design using TAB 1 as primary heat path to copper pour or heatsink |
| ESD Rating | >16 kV HBM - provides robust handling margin during board assembly and field operation |
Pinout & Package
Package: Powermite® (DO-216AA), molded surface-mount package with full metallic bottom and integral locking tab; cathode designated by TAB 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary thermal and electrical connection point; must be soldered to ≥1 cm² copper area for rated 3.0 W dissipation |
| Lead 2 | Anode | Standard anode terminal; electrically isolated from TAB 1; used for series connection in voltage-reference strings |
Key Features
| Feature | Design Value |
|---|---|
| Integral heat sink locking tab | Mechanically anchors device during reflow and conducts heat directly from junction to PCB copper via TAB 1 |
| Full metallic bottom | Eliminates solder flux entrapment risk and improves thermal transfer efficiency vs. plastic-bottom SMD packages |
| Automated insertion compatibility | Designed for pick-and-place and reflow processes per EIA-481 tape-and-reel standards (7″/3,000 pcs) |
| Tight voltage tolerance option | ±2% (suffix C) or ±1% (suffix D) available - supports high-accuracy feedback loops without external trimming |
| Low knee current | IZK = 0.25 mA - enables stable regulation even in micro-power monitoring circuits with high source impedance |
Applications
| Industrial Power Supply Feedback | Automotive Body Control Module Clamp |
|---|---|
Use Scenario: Regulates error amplifier reference in isolated flyback or forward converter feedback network. IC Role / Device Role / Timing Role: Zener diode providing stable 68 V reference for optocoupler-driven secondary-side regulation. Use Value: Maintains ±5% output voltage accuracy across temperature while dissipating ≤3.0 W under transient overload conditions. | Use Scenario: Clamps 12 V battery rail surges up to 68 V during load-dump events in BCM sub-systems. IC Role / Device Role / Timing Role: Overvoltage protection element shunting excess energy to ground before downstream LDOs or MCUs are damaged. Use Value: Withstands >16 kV ESD and 1700 µA leakage at 51.2 V, enabling reliable protection without false triggering. |
| Medical Sensor Bias Reference | Telecom Line Card Voltage Clamp |
Use Scenario: Supplies stable bias voltage to precision op-amp input stages in portable diagnostic sensor front-ends. IC Role / Device Role / Timing Role: Low-noise, low-leakage Zener reference replacing larger through-hole devices in space-constrained modules. Use Value: 120 Ω dynamic impedance minimizes signal distortion; 30°C/W thermal resistance allows direct mounting on sensor PCB ground plane. | Use Scenario: Protects Ethernet PHY interface ICs from induced transients on 48 V DC power inputs in PoE line cards. IC Role / Device Role / Timing Role: Primary clamping device limiting rail voltage to 68 V during surge events per IEC 61000-4-5 Level 3. Use Value: 3.0 W rating and DO-216 footprint enable high-energy transient absorption without requiring external TVS arrays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMF68A (ON Semiconductor) | 68 V, 1.0 W, SOD-123 package, 100 Ω ZZT at 10 mA | Lower power rating limits use to <1 W clamping; smaller footprint reduces thermal mass | Select when board space is critical and peak power <1 W; verify thermal relief on TAB-equivalent pad |
| BZX84-C68 (Diodes Inc.) | 68 V, 300 mW, SOT-23 package, 150 Ω ZZT at 5 mA | Not suitable for 3 W continuous dissipation; intended for signal-level referencing only | Use only for low-power biasing; avoid in power-rail protection where 1PMT5945B/TR7's 3.0 W rating is required |
Compared with SMF68A and BZX84-C68, the 1PMT5945B/TR7 delivers triple the power handling and superior thermal performance via its Powermite® TAB 1 interface, making it uniquely suited for industrial and automotive clamping where sustained 3 W dissipation and >16 kV ESD immunity are mandatory.
Availability
1PMT5945B/TR7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, medical sensor biasing, and telecom line card protection requiring stable component supply and long-term lifecycle support.
Supply support for 1PMT5945B/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 engineered for high-power density surface-mount voltage regulation and transient suppression in thermally demanding environments where traditional DO-41 or DO-15 packages cannot meet size or thermal goals.
FAQ
What is the Zener voltage tolerance for 1PMT5945B/TR7?
The 1PMT5945B/TR7 has a standard Zener voltage tolerance of ±5% at 68 V nominal, measured at 5.5 mA test current and TAB 1 temperature of 30°C. Tighter tolerances of ±2% (suffix C) and ±1% (suffix D) are available upon request but are not applicable to the base 1PMT5945B/TR7 marking.
How is thermal management handled for 1PMT5945B/TR7 in PCB layout?
Thermal management for 1PMT5945B/TR7 relies on TAB 1 as the primary heat path. The device requires direct soldering of TAB 1 to a minimum 1 cm² copper pour with thermal vias to internal ground planes. Its 30°C/W junction-to-TAB thermal resistance assumes this layout; insufficient copper area will derate the 3.0 W rating significantly.
Can 1PMT5945B/TR7 be used in place of through-hole Zener diodes like 1N5365B?
Yes, 1PMT5945B/TR7 is a direct surface-mount replacement for 1N5365B (68 V, 5 W axial lead) in applications where 3.0 W dissipation suffices. While 1N5365B offers higher power, the 1PMT5945B/TR7 achieves comparable regulation performance in half the footprint and adds >16 kV ESD immunity and flux-free assembly-critical for modern SMT lines.
What does the "TR7" suffix indicate in 1PMT5945B/TR7?
The "TR7" suffix denotes tape-and-reel packaging per EIA-481 standard on a 7-inch reel containing 3,000 units. This format is optimized for high-speed pick-and-place equipment and ensures consistent orientation (cathode TAB 1 leading) during automated assembly-no manual orientation verification needed.
Is 1PMT5945B/TR7 suitable for automotive AEC-Q200 compliance?
1PMT5945B/TR7 is not AEC-Q200 qualified. While it operates from –55°C to +150°C and meets stringent ESD and thermal specs, Microsemi did not submit this specific Powermite® variant to AEC-Q200 stress testing. For automotive-grade designs, consult Microchip's qualified alternatives such as the JANTXV-1N5365B or contact Aetrix for Q200-compliant Zener options.
1PMT5945B/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):
- 68 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 120 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 51.2 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
1PMT5945B/TR7 FAQ
1.How can I place an order for 1PMT5945B/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5945B/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 1PMT5945B/TR7 reliable?
The price and inventory of 1PMT5945B/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5945B/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5945B/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5945B/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5945B/TR7?
1PMT5945B/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5945B/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 1PMT5945B/TR7?
For technical support, including 1PMT5945B/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5945B/TR7 requirements.
6.How does Aetrix verify that 1PMT5945B/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5945B/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 1PMT5945B/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5945B/TR7?
All 1PMT5945B/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5945B/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 1PMT5945B/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5945B/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5945B/TR7 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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