My Inquiry
My Account
Microchip Technology 1PMT5945C/TR13
- Part No.:
- 1PMT5945C/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5945C/TR13.pdf
- Description:
- DIODE ZENER 68V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,659
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1PMT5945C/TR13 from Microsemi is a 68 V, ±1% tolerance surface-mount Zener diode in the Powermite® package, rated for 3.0 W DC power dissipation at TAB 1 = 60°C, with 51.2 mA maximum Zener current and 120 Ω dynamic impedance at 5.5 mA test current - used for precision voltage regulation in industrial power supplies and overvoltage protection circuits.
For engineers reviewing the 1PMT5945C/TR13 datasheet, 1PMT5945C/TR13 pinout, 1PMT5945C/TR13 application, or 1PMT5945C/TR13 equivalent, key selection criteria include tight voltage tolerance (±1%), ESD rating >16 kV HBM, full metallic bottom for flux-free soldering, thermal resistance of 30°C/W junction-to-TAB, and compatibility with EIA-481 tape-and-reel automated assembly.
Technical Context
This Zener diode operates as a two-terminal voltage reference device with cathode designated by TAB 1, requiring no external bias circuitry. Its Powermite® package integrates a locking tab that functions as an integral heat sink and provides mechanical anchoring during reflow.
The device exhibits low reverse leakage (≤1 µA at VR = 51.2 V), tight knee characteristics (IZK = 0.25 mA, ZZK = 1700 Ω), and stable regulation across -55°C to +150°C junction temperature range - enabling reliable operation in thermally demanding embedded power rails and automotive body electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 68 V ±1% - enables precise clamping in 48 V system overvoltage protection |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - supports sustained regulation without external heatsink in compact layouts |
| Dynamic Impedance | 120 Ω at IZT = 5.5 mA - ensures minimal output voltage variation under load transients |
| Test Current | 5.5 mA - defines operating point for specified VZ and ZZT measurements |
| Thermal Resistance | 30°C/W junction-to-TAB - allows accurate thermal design using TAB 1 as primary heat path |
| ESD Rating | >16 kV per HBM - eliminates need for external ESD protection in board-level handling |
| Reverse Leakage | ≤1 µA at VR = 51.2 V - guarantees low standby power loss in always-on monitoring circuits |
Pinout & Package
Package: Powermite® surface-mount molded package with full metallic bottom and integral locking tab (cathode designated by TAB 1). Mounting orientation is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary heat-sinking terminal and voltage reference node; must be connected to ground or low-impedance return path |
| Lead 2 | Anode | Input terminal for reverse-biased operation; connects to protected rail or regulated source |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount Powermite® package | Enables high-density PCB layout while delivering 3.0 W power handling comparable to through-hole DO-41 devices |
| Integral heat sink locking tab | Provides mechanical retention during reflow and reduces thermal resistance by direct metal-to-PCB conduction |
| Full metallic bottom | Eliminates solder flux entrapment risk, improving long-term reliability in humid or corrosive environments |
| ±1% Zener voltage tolerance (suffix C) | Reduces calibration overhead in precision reference designs versus standard ±5% variants |
| ESD rating >16 kV HBM | Permits direct handling and placement without ESD-safe workstations in high-volume manufacturing |
Applications
| Industrial Power Supply Regulation | Automotive Body Control Module Protection |
|---|---|
Use Scenario: Stabilizing feedback reference in isolated 48 V DC-DC converters for factory automation controllers. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing stable 68 V reference for optocoupler-based error amplification. Use Value: ±1% tolerance minimizes output voltage drift across temperature, reducing need for post-production trimming. | Use Scenario: Overvoltage clamp on LIN bus power rail exposed to load-dump transients in door module ECUs. IC Role / Device Role / Timing Role: Cathode-grounded transient suppressor limiting rail voltage to 68 V during 12 V system surges. Use Value: 3.0 W rating sustains clamping for >100 ms per ISO 7637-2 Pulse 5a, avoiding thermal runaway. |
| Telecom Line Card Surge Suppression | Medical Diagnostic Equipment Reference |
Use Scenario: Secondary protection stage after TVS diode on -48 V telecom power feed lines. IC Role / Device Role / Timing Role: Precision Zener establishing clamping threshold between fast-response TVS and downstream LDOs. Use Value: Low dynamic impedance (120 Ω) maintains tight voltage control during multi-kV surge events. | Use Scenario: Stable voltage reference for ADC biasing in portable ultrasound front-end signal chains. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) shunt reference ensuring <0.01% gain error in analog sensor interface. Use Value: 1700 Ω knee impedance ensures smooth turn-on below 51.2 V, preventing false triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMF68A (ON Semiconductor) | 68 V, ±5%, 1.0 W, SOD-123FL package, 100 Ω ZZT, no metallic bottom | Lower power rating limits use to <500 mW continuous clamping; unsuitable for sustained 3 W dissipation | Select only for space-constrained low-power biasing where thermal mass is externally managed |
| BZX84-C68 (Diodes Inc.) | 68 V, ±5%, 300 mW, SOT-23 package, 150 Ω ZZT, plastic bottom | Lacks integral heat sink and metallic thermal path; thermal resistance ~300°C/W vs. 30°C/W | Acceptable only in non-thermally stressed signal-level references, not power rail protection |
Compared with SMF68A and BZX84-C68, the 1PMT5945C/TR13 delivers 3× higher power handling, 10× lower thermal resistance, and ±1% tolerance - making it uniquely suitable for industrial-grade voltage regulation where accuracy, thermal robustness, and surge endurance are co-required.
Availability
1PMT5945C/TR13 is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive body control module protection, and telecom line card surge suppression requiring stable component supply and consistent parametric performance across production lots.
Supply support for 1PMT5945C/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 U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The Powermite® Zener diode product line was designed for high-power surface-mount voltage regulation in space-constrained, thermally aggressive environments - emphasizing mechanical robustness, flux-free assembly, and repeatable parametric stability.
FAQ
What is the Zener voltage tolerance for 1PMT5945C/TR13?
The "C" suffix in 1PMT5945C/TR13 denotes ±1% Zener voltage tolerance at 5.5 mA test current and TAB 1 temperature of 30°C. This is tighter than the standard ±5% (no suffix) or ±2% (D suffix) options in the same Powermite® family, supporting high-accuracy reference applications without external trimming.
How is thermal management handled in the 1PMT5945C/TR13 package?
The 1PMT5945C/TR13 uses its metallic TAB 1 as the primary thermal path, achieving 30°C/W junction-to-TAB thermal resistance. The full metallic bottom and locking tab ensure direct conduction to the PCB copper pour, eliminating reliance on lead-frame convection - critical for maintaining 3.0 W dissipation without derating in enclosed enclosures.
Is the 1PMT5945C/TR13 compatible with automated SMT assembly processes?
Yes, the 1PMT5945C/TR13 is fully compatible with EIA-481 tape-and-reel packaging (13-inch reel, 12,000 pieces) and designed for use with automatic insertion equipment. Its locking tab prevents rotation during pick-and-place, and the flux-free metallic bottom eliminates post-assembly cleaning requirements in high-reliability manufacturing lines.
What is the maximum reverse leakage current for 1PMT5945C/TR13?
The maximum reverse leakage current for 1PMT5945C/TR13 is 1 µA at VR = 51.2 V and TL = 30°C. This low leakage supports energy-efficient operation in battery-backed systems and ensures minimal error contribution when used as a precision reference in high-impedance feedback networks.
Does 1PMT5945C/TR13 meet any industry-standard ESD ratings?
Yes, the 1PMT5945C/TR13 has an ESD rating exceeding 16 kV per the Human Body Model (HBM), as verified per ANSI/ESDA/JEDEC JS-001. This allows safe handling and placement in standard manufacturing environments without dedicated ESD controls - a key advantage over generic Zener diodes lacking certified HBM validation.
1PMT5945C/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):
- 68 V
- Tolerance:
- ±2%
- 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
1PMT5945C/TR13 FAQ
1.How can I place an order for 1PMT5945C/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5945C/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 1PMT5945C/TR13 reliable?
The price and inventory of 1PMT5945C/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5945C/TR13 is usually 5 days.
3.What payment methods are accepted for 1PMT5945C/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5945C/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5945C/TR13?
1PMT5945C/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5945C/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 1PMT5945C/TR13?
For technical support, including 1PMT5945C/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5945C/TR13 requirements.
6.How does Aetrix verify that 1PMT5945C/TR13 is sourced from the original manufacturer or authorized distributors?
All 1PMT5945C/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 1PMT5945C/TR13 meets industry standards.
7.What is the process for return or replacement of 1PMT5945C/TR13?
All 1PMT5945C/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5945C/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 1PMT5945C/TR13 part is unused and in its original packaging.
Return procedure for 1PMT5945C/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5945C/TR13 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
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
