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Microchip Technology 1PMT5938B/TR7
- Part No.:
- 1PMT5938B/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5938B/TR7.pdf
- Description:
- DIODE ZENER 36V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,233
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Product details
Overview
1PMT5938B/TR7 from Microsemi is a 36 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 10.4 mA test current (IZT), 38 Ω dynamic impedance (ZZT), and 1 µA max reverse leakage at 27.4 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails and regulator feedback paths.
For engineers reviewing the 1PMT5938B/TR7 datasheet, 1PMT5938B/TR7 pinout, 1PMT5938B/TR7 application, or 1PMT5938B/TR7 equivalent, key selection criteria include its 36 V nominal Zener voltage, 3.0 W thermal capability via metallic tab, DO-216 mechanical outline, ESD rating >16 kV HBM, and compatibility with automated SMT assembly.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified test current range. Its Powermite® package integrates a full metallic bottom and locking tab to enhance thermal conduction from junction to PCB pad, enabling stable 3.0 W operation without external heatsinking.
The device exhibits low knee impedance (ZZK = 0.25 Ω) and maintains <1 µA reverse leakage up to 27.4 V, supporting reliable clamping in low-power sensing and protection circuits. Its DO-216 outline and cathode designation at TAB 1 define unambiguous mounting orientation and thermal interface design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 36 V ±5% at IZT = 10.4 mA - defines precise clamping threshold for 3.3 V–5 V logic rail protection |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - enables high-energy transient suppression without derating in compact layouts |
| Dynamic Impedance (ZZT) | 38 Ω at IZT - ensures minimal voltage shift under load variation in feedback networks |
| Reverse Leakage (IR) | ≤1 µA at VR = 27.4 V - guarantees low standby current in battery-backed circuits |
| Thermal Resistance | 30°C/W junction-to-TAB1 - allows direct thermal coupling to copper pour for passive cooling |
| ESD Rating | >16 kV HBM - provides robust handling during board assembly and field operation |
| Package Outline | DO-216 - standardized footprint compatible with JEDEC-compliant pick-and-place equipment |
Pinout & Package
Powermite® package: molded surface-mount housing with full metallic bottom and integral heat-sink locking tab; cathode designated by TAB 1; weight ≈0.016 g; operating junction temperature −55°C to +150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary thermal path and electrical connection point; must be soldered to copper pour for rated 3.0 W dissipation |
| Lead 2 | Anode | Standard anode terminal; mounted on PCB pad per DO-216 mechanical drawing; no thermal function |
Key Features
| Feature | Design Value |
|---|---|
| Full metallic bottom | Eliminates solder flux entrapment during reflow, ensuring void-free thermal interface and long-term reliability |
| Integral heat-sink locking tab | Provides mechanical anchoring and direct thermal conduction path from junction to PCB, enabling 3.0 W operation |
| Automated insertion compatibility | DO-216 outline and symmetric geometry support high-yield placement with standard SMT feeders and nozzles |
| Low reverse leakage | ≤1 µA at 76% of VZ ensures minimal loading in high-impedance reference nodes and sensor interfaces |
Applications
| DC Power Rail Protection | Feedback Reference in SMPS |
|---|---|
Use Scenario: Clamping transient surges on 24–48 V industrial control bus lines subject to inductive switching noise. IC Role / Device Role / Timing Role: Zener clamping element placed between rail and ground to limit voltage excursions above 36 V. Use Value: 3.0 W power rating absorbs 100–200 µs transients without degradation; metallic tab ensures repeatable thermal performance across temperature cycles. | Use Scenario: Providing stable voltage reference for optocoupler-based feedback in isolated flyback converters delivering 12 V/3 A output. IC Role / Device Role / Timing Role: Precision Zener reference connected to TL431 cathode or optocoupler LED anode. Use Value: Tight 5% VZ tolerance and 38 Ω ZZT maintain ±1% output regulation despite line/load variations. |
| Low-Power Sensor Biasing | ESD-Sensitive Interface Protection |
Use Scenario: Supplying regulated bias voltage to analog temperature sensors in battery-powered IoT node PCBs. IC Role / Device Role / Timing Role: Low-leakage Zener shunt regulator generating clean 3.6 V reference from 5 V LDO output. Use Value: ≤1 µA IR at 27.4 V minimizes quiescent current draw, extending 10-year battery life in remote deployments. | Use Scenario: Protecting RS-485 transceiver inputs against ESD events in factory automation gateways. IC Role / Device Role / Timing Role: Primary clamping diode placed before TVS array to absorb initial 16 kV HBM discharge energy. Use Value: >16 kV HBM rating and 3.0 W surge capacity prevent latch-up or parametric shift in downstream ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMCJ36A | TVS diode, 36 V standoff, 600 W peak pulse power, unidirectional, DO-214AB package | Designed for high-energy transient suppression (IEC 61000-4-5), not precision regulation | Select when surge immunity >100 A 8/20 µs required; not suitable for reference use due to wide VBR tolerance and higher leakage |
| BZX84-C36 | 36 V Zener, 300 mW, SOT-23, ±5% tolerance, 90 Ω ZZT, 100 nA IR at 28.8 V | Lower power, smaller footprint, higher impedance, lower leakage - suited for signal-level biasing only | Select for space-constrained low-current references (<5 mA); avoid where >3.0 W clamping or thermal stability is needed |
Compared with SMCJ36A and BZX84-C36, the 1PMT5938B/TR7 uniquely combines 3.0 W continuous dissipation, DO-216 manufacturability, and 36 V precision regulation-making it optimal for mid-power industrial clamping and feedback applications where both accuracy and thermal robustness are required.
Availability
1PMT5938B/TR7 is available at Aetrix Electronics and suitable for industrial power supplies, factory automation controllers, and telecom infrastructure equipment requiring stable component supply with consistent Zener voltage and thermal performance.
Supply support for 1PMT5938B/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 series was designed to deliver high-power surface-mount voltage regulation in space-constrained environments where thermal management and assembly yield are critical-targeting industrial power conversion and ruggedized control systems.
FAQ
What is the Zener voltage tolerance for 1PMT5938B/TR7?
The 1PMT5938B/TR7 has a standard Zener voltage tolerance of ±5% at 36 V nominal, measured at IZT = 10.4 mA and TAB 1 temperature of 30°C. Tighter tolerances (±2%, ±1%) are available with suffixes C and D, but the /TR7 variant uses the standard ±5% grade.
How is thermal performance defined for 1PMT5938B/TR7?
The 1PMT5938B/TR7 specifies a thermal resistance of 30°C/W junction-to-TAB1 and a maximum DC power dissipation of 3.0 W when TAB 1 is held at 60°C. Effective cooling requires soldering TAB 1 to a minimum 100 mm² copper pour to achieve rated power.
Is 1PMT5938B/TR7 compatible with lead-free reflow processes?
Yes, the 1PMT5938B/TR7 is qualified for lead-free reflow per J-STD-020. Its Powermite® package withstands peak temperatures up to 260°C for 30 seconds, and the full metallic bottom ensures reliable wetting and void-free solder joints under standard profile conditions.
What does the "TR7" suffix indicate in 1PMT5938B/TR7?
The "TR7" suffix denotes tape-and-reel packaging per EIA-481 standard, with 3,000 units per 7-inch reel. This format supports automated SMT placement and is the standard shipping configuration for volume production orders of the 1PMT5938B/TR7.
Can 1PMT5938B/TR7 be used as a replacement for through-hole Zeners like 1N5227B?
No - the 1PMT5938B/TR7 is not a drop-in replacement for 1N5227B (3.6 V, 500 mW). It differs in voltage (36 V vs. 3.6 V), power rating (3.0 W vs. 0.5 W), package (DO-216 surface-mount vs. DO-35 through-hole), and thermal path (TAB 1 conduction vs. lead-frame conduction). Direct substitution would require schematic and layout changes.
1PMT5938B/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):
- 36 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 38 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 27.4 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
1PMT5938B/TR7 FAQ
1.How can I place an order for 1PMT5938B/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5938B/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 1PMT5938B/TR7 reliable?
The price and inventory of 1PMT5938B/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5938B/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5938B/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5938B/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5938B/TR7?
1PMT5938B/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5938B/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 1PMT5938B/TR7?
For technical support, including 1PMT5938B/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5938B/TR7 requirements.
6.How does Aetrix verify that 1PMT5938B/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5938B/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 1PMT5938B/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5938B/TR7?
All 1PMT5938B/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5938B/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 1PMT5938B/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5938B/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5938B/TR7 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
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MMSZ5231B-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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SMAJ4744A-TP
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SMAZ12-13-F
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