My Inquiry
My Account
Microchip Technology 1PMT5942E3/TR7
- Part No.:
- 1PMT5942E3/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5942E3/TR7.pdf
- Description:
- DIODE ZENER 51V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,223
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1PMT5942E3/TR7 from Microsemi is a 51 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 70 Ω dynamic impedance at 7.3 mA test current and 1100 µA max reverse leakage at 38.8 V. It serves as a precision voltage reference or overvoltage clamp in power supply regulation circuits.
For engineers reviewing the 1PMT5942E3/TR7 datasheet, 1PMT5942E3/TR7 pinout, 1PMT5942E3/TR7 application, or 1PMT5942E3/TR7 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (30°C/W junction-to-TAB), ESD rating (>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 in reverse breakdown mode with a nominal zener voltage of 51 V at 7.3 mA test current (IZT), exhibiting 70 Ω dynamic impedance (ZZT) and 1100 µA maximum reverse leakage (IR) at 38.8 V (VR). Its thermal resistance is 30°C/W from junction to TAB 1, enabling stable regulation under sustained 3.0 W power dissipation when mounted on thermally adequate PCB copper.
The device uses a DO-216 molded surface-mount package with full metallic bottom and integral heat-sink locking tab. Cathode is designated by TAB 1, and mounting orientation is unrestricted. It meets >16 kV ESD rating per human body model and supports automatic insertion equipment without flux entrapment risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V ±5% at IZT = 7.3 mA - defines stable regulation point under nominal bias |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - sets maximum continuous power handling with thermal derating above 60°C |
| Dynamic Impedance (ZZT) | 70 Ω at IZT - determines output voltage stability under small-signal current variations |
| Reverse Leakage (IR) | ≤1100 µA at VR = 38.8 V - limits standby power loss in clamping or reference applications |
| Thermal Resistance | 30°C/W junction-to-TAB 1 - enables thermal design using PCB copper area as heatsink |
| ESD Rating | >16 kV HBM - ensures robustness during handling and board assembly |
| Knee Impedance (ZZK) | 17.5 Ω at IZK = 0.25 mA - indicates low-voltage regulation capability near breakdown threshold |
Pinout & Package
Package: DO-216 surface-mount molded case with full metallic bottom and integral heat-sink locking tab; cathode designated by TAB 1; weight ≈ 0.016 g; junction/storage temp range −55°C to +150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary heat-sinking terminal and electrical cathode connection; must be soldered to thermal pad for rated 3.0 W operation |
| Lead 2 | Anode | Standard anode connection; electrically isolated from TAB 1; used for circuit return path |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount Powermite® package | Enables high-density PCB layout while delivering 3.0 W power handling comparable to larger through-hole Zeners |
| Integral heat-sink locking tab | Provides mechanical anchoring and direct thermal conduction path from junction to PCB copper via TAB 1 |
| Full metallic bottom | Eliminates solder flux entrapment during reflow, improving long-term reliability and solder joint integrity |
| EIA-481 tape-and-reel packaging | Supports fully automated pick-and-place assembly at standard industry speeds (3,000 pcs/7″ reel) |
| 16 kV HBM ESD rating | Reduces need for external ESD protection in sensitive input or interface circuits |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in optocoupler feedback loop of isolated DC-DC converters to regulate output voltage within ±5%. IC Role / Device Role / Timing Role: Precision voltage reference establishing error threshold for TL431-like control schemes. Use Value: 51 V zener voltage and 70 Ω dynamic impedance ensure tight regulation despite load and line variations. | Use Scenario: Placed across DC bus rails to clamp transient overvoltages exceeding 38.8 V before they damage downstream ICs. IC Role / Device Role / Timing Role: Fast-acting shunt protector absorbing surge energy up to 3.0 W continuously. Use Value: Metallic TAB 1 and 30°C/W thermal resistance allow reliable clamping without external heatsink. |
| Industrial Sensor Signal Conditioning | Programmable Logic Controller Input Protection |
Use Scenario: Stabilizes excitation voltage for bridge-based pressure sensors operating from 48 V industrial supplies. IC Role / Device Role / Timing Role: Low-drift voltage reference providing stable bias for instrumentation amplifiers. Use Value: Tight 5% tolerance and <1100 µA leakage minimize offset drift and power consumption in battery-backed modules. | Use Scenario: Connected between field input terminals and PLC digital input IC to suppress EFT and surge events. IC Role / Device Role / Timing Role: Primary ESD and transient suppression element meeting IEC 61000-4-2/4-4 requirements. Use Value: >16 kV HBM rating and robust DO-216 package withstand repeated electrostatic discharges without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5355B | Same 51 V nominal zener voltage but in DO-204AL (DO-41) through-hole package; 5 W rating; higher thermal resistance (~50°C/W) | Requires through-hole assembly and larger PCB footprint; better suited for prototyping or low-volume manual builds | Select when legacy through-hole compatibility or higher peak pulse power is required, not for space-constrained SMT designs |
| BZX84-C51 | 51 V SOT-23 Zener; 300 mW rating; 90 Ω dynamic impedance; no metallic thermal tab | Limited to low-power signal-level clamping; cannot sustain 3.0 W continuous dissipation | Choose only for low-current biasing or logic-level protection where thermal performance is non-critical |
Compared with 1N5355B and BZX84-C51, the 1PMT5942E3/TR7 uniquely delivers 3.0 W surface-mount power handling with integrated thermal tab and EIA-481 automation support-making it the only option among the three qualified for high-reliability, high-power SMT voltage regulation.
Availability
1PMT5942E3/TR7 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial overvoltage protection circuits, sensor excitation references, and programmable controller input stages requiring stable component supply and consistent thermal performance.
Supply support for 1PMT5942E3/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 suppression in harsh-environment power systems where thermal management and assembly automation are critical.
FAQ
What is the zener voltage tolerance for 1PMT5942E3/TR7?
The 1PMT5942E3/TR7 has a standard zener voltage tolerance of ±5% at 51 V, measured at 7.3 mA test current with TAB 1 held at 30°C. Tighter tolerances (±2% and ±1%) are available with suffixes C and D respectively, but the E3/TR7 variant specifies ±5%. This tolerance directly impacts regulation accuracy in feedback and reference applications.
How is thermal management handled for 1PMT5942E3/TR7 in high-power operation?
The 1PMT5942E3/TR7 achieves thermal management via its metallic TAB 1, which serves as both cathode and primary heat-sink interface. With a junction-to-TAB thermal resistance of 30°C/W, it requires adequate PCB copper area under TAB 1 to sustain its 3.0 W rating at 60°C ambient. Derating is necessary above that temperature, per the device's thermal curve.
Is 1PMT5942E3/TR7 compatible with automated SMT assembly processes?
Yes, the 1PMT5942E3/TR7 is supplied in EIA-481 compliant tape-and-reel format (3,000 pieces per 7-inch reel) and features a DO-216 package with integral locking tab and full metallic bottom-both engineered to prevent flux entrapment and ensure reliable placement and reflow. Its geometry and thermal profile are validated for standard SMT lines.
What is the maximum reverse leakage current for 1PMT5942E3/TR7, and at what voltage is it specified?
The maximum reverse leakage current for 1PMT5942E3/TR7 is 1100 µA, specified at a reverse voltage (VR) of 38.8 V. This value reflects worst-case leakage under conditions well below zener breakdown and is critical for low-power standby circuits where quiescent current must be minimized.
Does 1PMT5942E3/TR7 have ESD protection built-in, and what level is certified?
Yes, the 1PMT5942E3/TR7 is rated for >16 kV electrostatic discharge per the Human Body Model (HBM), as confirmed in the official Microsemi datasheet. This intrinsic ESD robustness eliminates the need for additional discrete protection in many interface and input-stage applications, reducing BOM count and board area.
1PMT5942E3/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):
- 51 V
- Tolerance:
- ±20%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 38.8 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
1PMT5942E3/TR7 FAQ
1.How can I place an order for 1PMT5942E3/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5942E3/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 1PMT5942E3/TR7 reliable?
The price and inventory of 1PMT5942E3/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5942E3/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5942E3/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5942E3/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5942E3/TR7?
1PMT5942E3/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5942E3/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 1PMT5942E3/TR7?
For technical support, including 1PMT5942E3/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5942E3/TR7 requirements.
6.How does Aetrix verify that 1PMT5942E3/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5942E3/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 1PMT5942E3/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5942E3/TR7?
All 1PMT5942E3/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5942E3/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 1PMT5942E3/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5942E3/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5942E3/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
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…
