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onsemi 1PMT5939BT1G
- Part No.:
- 1PMT5939BT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5939BT1G.pdf
- Description:
- DIODE ZENER 39V 3.2W POWERMITE
- Quantity:
- Payment:
- Shipping:
Inventory:3,608
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Product details
Overview
1PMT5939BT1G from onsemi is a 3.2 W surface-mount Zener diode in POWERMITE® (DO−216AA) package, with nominal Zener voltage 39 V (min 37.05 V, max 40.95 V), test current 9.6 mA, dynamic impedance 45 Ω at IZT, and reverse leakage ≤0.25 µA at 29.7 V. It delivers stable voltage regulation in compact portable power rails.
For engineers reviewing the 1PMT5939BT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 39 V regulation tolerance, 3.2 W dissipation at cathode tab @75°C, 1.1 mm height constraint, Pb-free compliance, and ESD robustness (>16 kV HBM).
Technical Context
This Zener diode operates as a precision shunt voltage regulator in low-power supply rails and reference circuits. Its thermal design relies on cathode-tab conduction (RJcathode = 23°C/W) to sustain 3.2 W at Ttab = 75°C, while maintaining low-profile mounting (max height 1.1 mm) and minimal footprint (8.45 mm²).
It exhibits a positive temperature coefficient above ~5 V, with typical VZ drift of +2.5 mV/°C near 39 V. The device is characterized at TL = 30°C for electrical specs, and supports reflow soldering up to 260°C for 10 seconds with no derating required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 37.05–40.95 V @ IZT = 9.6 mA - defines regulation band for stable 39 V reference under load |
| Power Dissipation | 3.2 W @ cathode tab = 75°C - enables high-power density without heatsink in space-constrained PCBs |
| Zener Impedance (ZZT) | 45 Ω @ IZT - limits output voltage variation under dynamic load changes |
| Reverse Leakage (IR) | ≤0.25 µA @ VR = 29.7 V - ensures minimal quiescent current in battery-powered standby modes |
| ESD Rating | Class 3 (>16 kV HBM) - protects against handling-induced damage during assembly and field operation |
| Package | POWERMITE® (DO−216AA), 1.1 mm max height - fits ultra-thin consumer enclosures and stacked PCB assemblies |
| Thermal Resistance (J-to-Tab) | 23°C/W - allows direct thermal coupling to copper pour or metal core for sustained 3.2 W operation |
Pinout & Package
The 1PMT5939BT1G uses a 2-terminal POWERMITE® (DO−216AA) plastic surface-mount package with full metallic bottom for enhanced thermal conduction and flux-free soldering. Cathode is marked by polarity band and oriented toward sprocket holes in tape.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener anode connection point | Primary heat path; must be connected to thermal pad or copper pour for rated 3.2 W dissipation |
| 2 (Anode) | Zener cathode connection point | Reference node; connects to regulated rail; polarity band identifies this terminal visually |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile construction | 1.1 mm max height enables use in <1.6 mm total board thickness designs (e.g., smartphones, wearables) |
| Integral heat sink tabs | Metallic bottom and locking tabs provide mechanical retention and 23°C/W J-to-tab thermal path without external heatsink |
| Small footprint area | 8.45 mm² footprint reduces PCB real estate vs. SMA by 50%, easing layout in dense power sections |
| Pb-free packaging | RoHS-compliant lead finish supports automated reflow and eliminates post-solder cleaning for high-reliability production |
| Full metallic bottom | Eliminates flux entrapment during reflow, preventing voids and ensuring consistent solder joint integrity |
Applications
| Portable Power Management | Battery Protection Circuit |
|---|---|
Use Scenario: Regulating auxiliary 3.3 V or 5 V rails in Bluetooth headsets and smartwatches where board height is limited to 1.2 mm. IC Role / Device Role / Timing Role: Shunt voltage reference for LDO feedback or overvoltage clamp in charging IC input stage. Use Value: 1PMT5939BT1G's 1.1 mm profile and 39 V rating allow safe clamping of 36 V surge transients without increasing stack height. | Use Scenario: Overvoltage protection in 2-cell Li-ion battery packs (nominal 7.4 V, max charge 8.4 V) with integrated fuel gauge. IC Role / Device Role / Timing Role: Precision Zener reference for comparator threshold setting in battery management system (BMS) cell monitoring. Use Value: Tight 37.05–40.95 V tolerance ensures accurate trip point for 36 V pack overvoltage detection, minimizing false triggers. |
| Industrial Sensor Interface | POS Terminal Power Rail |
Use Scenario: Providing stable 39 V bias for avalanche photodiode (APD) biasing in optical smoke detectors. IC Role / Device Role / Timing Role: High-stability shunt regulator supplying constant reverse-bias voltage to APD anode. Use Value: Low 45 Ω ZZT and <0.25 µA leakage maintain signal-to-noise ratio across temperature (−55°C to +150°C). | Use Scenario: Clamp protection on 24 V DC input of retail point-of-sale terminals exposed to automotive-grade load dump transients. IC Role / Device Role / Timing Role: Transient voltage suppressor placed before DC-DC converter input stage. Use Value: 3.2 W rating and 23°C/W thermal resistance enable single-device suppression of 300 ms, 36 V surges without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | Through-hole DO-41 package, 1 W rating, 36.9–41.1 V range, 50 Ω ZZT, 1.5 mm height | Requires through-hole assembly and larger PCB area; unsuitable for ultra-thin or high-density SMT layouts | Select when legacy through-hole compatibility or lower cost per unit outweighs size and thermal performance needs |
| MMBZ5242B | SOT-23 package, 0.35 W rating, 36.0–40.0 V range, 150 Ω ZZT, 1.1 mm height | Limited power handling restricts use to signal-level references; cannot sustain >300 mW continuous dissipation | Select only for low-current biasing (<5 mA) where 1PMT5939BT1G's 3.2 W capability is unnecessary |
Compared with 1N4739A and MMBZ5242B, the 1PMT5939BT1G uniquely combines 3.2 W power handling, 1.1 mm profile, and DO−216AA package-enabling compact, thermally robust shunt regulation unattainable with either alternative.
Availability
1PMT5939BT1G is available at Aetrix Electronics and suitable for portable power management, battery protection circuits, industrial sensor interfaces, and POS terminal power rails requiring stable component supply with tight Zener voltage control and high thermal reliability.
Supply support for 1PMT5939BT1G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.
The 1PMT5939BT1G belongs to the 1PMT59xxB Series Zener diodes, engineered specifically for high-power-density surface-mount voltage regulation in space- and height-constrained portable and industrial electronics.
FAQ
What is the Zener voltage tolerance of the 1PMT5939BT1G?
The 1PMT5939BT1G has a specified Zener voltage range of 37.05 V to 40.95 V at IZT = 9.6 mA and TL = 30°C. This ±5% tolerance ensures predictable regulation behavior in precision reference and overvoltage clamp applications where 39 V stability is critical.
Can the 1PMT5939BT1G dissipate 3.2 W continuously in standard FR-4 PCB layout?
Yes, the 1PMT5939BT1G achieves its full 3.2 W rating only when the cathode (Terminal 1) is thermally connected to a sufficient copper area or thermal pad that maintains Ttab ≤ 75°C. On standard FR-4 with recommended minimum pad size, derating applies above 25°C ambient per the datasheet's derating curve.
Is the 1PMT5939BT1G RoHS-compliant and halogen-free?
Yes, the "G" suffix in 1PMT5939BT1G explicitly denotes a Pb-free (RoHS-compliant) package. The device meets JEDEC standards for lead-free soldering and is manufactured using halogen-free molding compound per onsemi's environmental specifications.
How does the 1PMT5939BT1G compare to SMA-package Zeners in thermal performance?
The 1PMT5939BT1G's POWERMITE® package delivers equivalent thermal resistance (RJcathode = 23°C/W) to SMA packages but occupies 50% less footprint area and stands only 1.1 mm tall-making it superior for height-sensitive designs without sacrificing thermal capability.
What is the maximum reverse leakage current for the 1PMT5939BT1G at 29.7 V?
The 1PMT5939BT1G guarantees reverse leakage current ≤0.25 µA at VR = 29.7 V and TL = 25°C. This ultra-low leakage supports long battery life in always-on sensor nodes and low-power backup circuits where standby current must remain sub-microamp.
1PMT5939BT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-216AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 3.2 W
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 29.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.25 V @ 200 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Powermite
1PMT5939BT1G FAQ
1.How can I place an order for 1PMT5939BT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5939BT1G 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 1PMT5939BT1G reliable?
The price and inventory of 1PMT5939BT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5939BT1G is usually 5 days.
3.What payment methods are accepted for 1PMT5939BT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5939BT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5939BT1G?
1PMT5939BT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5939BT1G 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 1PMT5939BT1G?
For technical support, including 1PMT5939BT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5939BT1G requirements.
6.How does Aetrix verify that 1PMT5939BT1G is sourced from the original manufacturer or authorized distributors?
All 1PMT5939BT1G 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 1PMT5939BT1G meets industry standards.
7.What is the process for return or replacement of 1PMT5939BT1G?
All 1PMT5939BT1G units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5939BT1G, 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 1PMT5939BT1G part is unused and in its original packaging.
Return procedure for 1PMT5939BT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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