My Inquiry
My Account
Microchip Technology 1PMT5946C/TR7
- Part No.:
- 1PMT5946C/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5946C/TR7.pdf
- Description:
- DIODE ZENER 75V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,021
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1PMT5946C/TR7 from Microsemi is a 75 V, ±1% tolerance Zener diode in the Powermite® surface-mount 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 thermal resistance of 30°C/W junction-to-TAB1. It serves as a precision voltage reference or overvoltage clamp in power supply regulation and transient protection circuits.
For engineers reviewing the 1PMT5946C/TR7 datasheet, 1PMT5946C/TR7 pinout, 1PMT5946C/TR7 application, or 1PMT5946C/TR7 equivalent, key selection criteria include its tight 1% voltage tolerance, low reverse leakage (≤1 µA at 60 V), ESD rating >16 kV HBM, DO-216 mechanical outline, and full metallic bottom for flux-free reflow assembly.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 75 V measured at 5.0 mA (IZT) with TAB 1 temperature held at 30°C. Its 140 Ω dynamic impedance (ZZT) and 2000 Ω knee impedance (ZZK) at 0.25 mA define regulation stiffness across operating current range.
The device uses a molded DO-216 package with cathode designated by TAB 1, full metallic bottom for thermal conduction and solder flux exclusion, and integral locking tab acting as heat sink. Junction-to-TAB1 thermal resistance is 30°C/W, enabling stable 3.0 W power handling when TAB 1 is maintained at ≤60°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 75 V ±1% at IZT = 5.0 mA, TL = 30°C - enables precise voltage clamping or reference within ±0.75 V tolerance. |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - supports high-energy transient suppression without derating in compact SMT layout. |
| Dynamic Impedance | 140 Ω at IZT = 5.0 mA - ensures minimal output voltage shift under load current variation. |
| Reverse Leakage | ≤1 µA at VR = 60 V - guarantees low standby power loss in bias or sensing circuits. |
| Thermal Resistance | 30°C/W junction-to-TAB1 - allows direct thermal path to PCB copper pour or heatsink via metallic tab. |
| ESD Rating | >16 kV per Human Body Model - provides robust handling and system-level ESD immunity without external protection. |
Pinout & Package
Package: DO-216 (Powermite®), surface-mount, molded plastic with full metallic bottom and integral heat-sink locking tab. Cathode is designated by TAB 1.
| 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 for thermal and electrical stability. |
| Lead 2 | Anode | Input terminal for reverse-bias operation; connects to protected rail or regulated node requiring clamping. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% Zener voltage tolerance | Enables high-accuracy voltage regulation without post-production trimming or calibration. |
| Full metallic bottom | Eliminates solder flux entrapment during reflow, improving long-term reliability and void-free solder joints. |
| Integral heat-sink locking tab | Provides mechanical anchoring during automatic insertion and enhances thermal transfer to PCB copper. |
| DO-216 mechanical outline | Ensures compatibility with standard SMT pick-and-place equipment and IPC-7351 footprint libraries. |
Applications
| Switch-Mode Power Supply Clamp | Industrial Sensor Reference |
|---|---|
Use Scenario: Clamping flyback voltage spikes across MOSFET drains in 48 V telecom PSUs. IC Role / Device Role / Timing Role: Zener diode providing fast, repeatable 75 V overvoltage clamp to protect switching FETs. Use Value: 3.0 W power rating and 30°C/W thermal resistance allow sustained clamping without thermal runaway under repetitive transients. | Use Scenario: Providing stable 75 V reference for analog front-end scaling in high-voltage industrial current sensors. IC Role / Device Role / Timing Role: Precision voltage reference element with ±1% tolerance ensuring measurement linearity over temperature. Use Value: Low 1 µA reverse leakage at 60 V minimizes loading error on high-impedance sensor signal paths. |
| Automotive ECU Protection | Test Equipment Voltage Standard |
Use Scenario: Suppressing load-dump transients on 24 V battery rails in engine control units. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing ISO 7637-2 Pulse 5a energy bursts. Use Value: >16 kV HBM ESD rating and robust 150°C storage capability ensure survivability in harsh automotive environments. | Use Scenario: Calibrating benchtop multimeters and programmable power supplies requiring traceable 75 V reference. IC Role / Device Role / Timing Role: Stable, low-drift voltage standard used in metrology-grade calibration fixtures. Use Value: Tight 1% tolerance and low dynamic impedance (140 Ω) maintain accuracy under varying source impedance conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5359B | Same 75 V nominal, ±5% tolerance, 5 W rating in DO-201AD package; higher power but larger footprint and no metallic bottom. | Used where higher surge energy handling is required and board space permits through-hole or larger SMT package. | Select 1N5359B only if 5 W peak dissipation is needed and thermal path to ambient suffices without direct tab cooling. |
| BZX84-C75 | 75 V ±5%, 300 mW rating in SOT-23; significantly lower power, no metallic tab, 300x smaller thermal mass. | Suitable for low-power biasing or signal-level clamping, not for 3 W continuous or transient energy absorption. | Choose BZX84-C75 only for space-constrained, low-current applications where thermal performance is secondary. |
Compared with 1N5359B and BZX84-C75, the 1PMT5946C/TR7 uniquely combines 3.0 W power handling, ±1% tolerance, DO-216 SMT form factor, and metallic-tab thermal management-making it optimal for high-reliability, thermally constrained industrial and automotive clamping roles.
Availability
1PMT5946C/TR7 is available at Aetrix Electronics and suitable for switch-mode power supply clamp, industrial sensor reference, automotive ECU protection, and test equipment voltage standard applications requiring stable component supply and consistent parametric performance.
Supply support for 1PMT5946C/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 for high-power-density, thermally efficient voltage regulation and transient suppression in space-constrained, high-reliability power systems.
FAQ
What is the Zener voltage tolerance for 1PMT5946C/TR7?
The "C" suffix in 1PMT5946C/TR7 denotes ±1% zener voltage tolerance at 5.0 mA test current and TAB 1 temperature of 30°C. This is tighter than the standard ±5% (B suffix) and supports precision regulation without external trimming. The 1PMT5946C/TR7 achieves this via process-controlled doping and screening, verified per Microsemi's qualification standards.
How is thermal management handled in the 1PMT5946C/TR7 package?
The 1PMT5946C/TR7 uses a DO-216 Powermite® package with a full metallic bottom and integral locking tab that serves as the primary thermal path. Its 30°C/W junction-to-TAB1 thermal resistance requires TAB 1 to be soldered to a copper pour or heatsink. At 3.0 W dissipation, TAB 1 must remain ≤60°C to avoid exceeding maximum junction temperature.
Is the 1PMT5946C/TR7 compatible with lead-free reflow processes?
Yes, the 1PMT5946C/TR7 is qualified for lead-free reflow per JEDEC J-STD-020. Its molded plastic body and metallic terminals withstand peak temperatures up to 260°C for 10 seconds. The full metallic bottom also prevents flux entrapment, reducing risk of solder joint corrosion or voiding during Pb-free thermal profiles.
What does the "TR7" suffix indicate in 1PMT5946C/TR7?
The "TR7" suffix specifies tape-and-reel packaging per EIA-481 standard, with 3,000 units per 7-inch reel. This format ensures compatibility with automated SMT placement equipment and supports high-volume manufacturing. The reel orientation and pocket design are optimized for reliable pick-and-place of the DO-216 outline.
Can the 1PMT5946C/TR7 be used as a replacement for older 1N52xx series Zeners?
No - the 1PMT5946C/TR7 is not a drop-in replacement for 1N52xx devices due to fundamental differences: 1N52xx are 0.5 W through-hole Zeners in DO-35 packages, while 1PMT5946C/TR7 is a 3.0 W SMT device in DO-216 with metallic tab thermal path. Substitution would require PCB redesign, thermal analysis, and validation of clamping response under transient conditions.
1PMT5946C/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):
- 75 V
- Tolerance:
- ±2%
- 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
1PMT5946C/TR7 FAQ
1.How can I place an order for 1PMT5946C/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5946C/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 1PMT5946C/TR7 reliable?
The price and inventory of 1PMT5946C/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5946C/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5946C/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5946C/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5946C/TR7?
1PMT5946C/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5946C/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 1PMT5946C/TR7?
For technical support, including 1PMT5946C/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5946C/TR7 requirements.
6.How does Aetrix verify that 1PMT5946C/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5946C/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 1PMT5946C/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5946C/TR7?
All 1PMT5946C/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5946C/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 1PMT5946C/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5946C/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5946C/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…
