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Vishay General Semiconductor - Diodes Division SMPZ3932B-E3/85A
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- Part No.:
- SMPZ3932B-E3/85A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-220AA
- Datasheet:
-
SMPZ3932B-E3/85A.pdf
- Description:
- DIODE ZENER 20V 500MW DO220AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,595
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Product details
Overview
SMPZ3932B-E3/85A from Vishay General Semiconductor is a surface-mount Zener voltage-regulating diode with nominal Zener voltage 20 V, 14 mA test current (IZT), 650 Ω maximum Zener impedance at IZT, 0.5 μA maximum reverse leakage at 15.2 V, and 75 mA maximum DC Zener current - used for precision voltage reference and overvoltage protection in power supply rails.
For engineers reviewing the SMPZ3932B-E3/85A datasheet, SMPZ3932B-E3/85A pinout, SMPZ3932B-E3/85A application, or SMPZ3932B-E3/85A equivalent, key selection criteria include Zener voltage tolerance (±5 %), thermal resistance (50 °C/W junction-to-lead), MSL level 1 rating, DO-220AA package footprint, and low-profile 1.0 mm height for space-constrained PCB layouts.
Technical Context
This device operates as a single-element, cathode-banded Zener diode optimized for stable DC voltage regulation under varying load and temperature conditions. It delivers 20 V nominal regulation at 14 mA IZT with ±5 % tolerance, exhibits low dynamic impedance (650 Ω max at IZT), and maintains <0.5 μA leakage at VR = 15.2 V.
Designed for surface-mount assembly on standard PCBs with 5.0 mm × 5.0 mm copper pads per terminal, it supports reflow soldering up to 260 °C peak (MSL level 1) and achieves 150 °C maximum junction temperature with 1500 mW power dissipation at TL = 75 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.0 V min / 20.0 V nom / 21.0 V max at 14 mA - defines regulated output voltage range under standard test conditions |
| Zener Test Current (IZT) | 14 mA - operating point where VZ is specified; sets bias requirement for stable regulation |
| Zener Impedance (ZZT) | 650 Ω max at IZT - determines regulation accuracy under load variation |
| Reverse Leakage (IR) | 0.5 μA max at 15.2 V - ensures minimal standby current in protection circuits |
| Power Dissipation (Ptot) | 1500 mW at TL = 75 °C - enables high-power regulation when mounted on thermally enhanced pads |
| Thermal Resistance (RθJL) | 50 °C/W - allows accurate junction temperature estimation from lead temperature in layout design |
| Package | SMP (DO-220AA) - ultra-low-profile 2-terminal SMD package with 1.0 mm typical height and matte tin leads |
Pinout & Package
SMPZ3932B-E3/85A uses the SMP (DO-220AA) surface-mount package: two-terminal, cathode denoted by color band, 24 mg weight, UL 94 V-0 molding compound, and MSL level 1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener breakdown reference | Connected to lower-potential node in regulation circuit; forms Zener junction with cathode |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with color band; supplies regulated voltage relative to anode; must be biased positive w.r.t. anode for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low profile height | 1.0 mm typical - enables use in ultra-thin consumer and portable electronics assemblies |
| Low Zener impedance | 650 Ω max at 14 mA - improves voltage stability against load transients in feedback paths |
| MSL level 1 rating | Peak reflow temperature 260 °C for 10 s - supports standard lead-free assembly without baking or special handling |
| Halogen-free & RoHS-compliant | M3 suffix material set - meets industrial-grade environmental compliance requirements for global deployment |
| Matte tin plated leads | Solderable per J-STD-002 and JESD 22-B102 - ensures reliable wetting and intermetallic formation during reflow |
Applications
| Power Supply Voltage Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in adjustable DC-DC converter ICs requiring precise 20 V reference. IC Role / Device Role / Timing Role: Zener diode provides fixed reference voltage to error amplifier input in switching regulator feedback loop. Use Value: Tight 20 V ±5 % tolerance and low 650 Ω Zener impedance ensure output voltage accuracy remains within ±1.5 % across line/load variations. | Use Scenario: Clamping transient surges on 18–22 V automotive control module inputs exposed to load dump events. IC Role / Device Role / Timing Role: Shunts excess energy to ground when input exceeds 21 V, protecting downstream logic and analog circuitry. Use Value: 75 mA maximum Zener current and 1500 mW power capability at TL = 75 °C sustain clamping during 100 ms load dump pulses. |
| Industrial Sensor Excitation | Programmable Logic Controller (PLC) Input Conditioning |
Use Scenario: Providing stable excitation voltage to 4-wire RTD bridges in factory-floor temperature transmitters. IC Role / Device Role / Timing Role: Acts as passive voltage reference source for bridge bias, replacing active regulators to reduce noise and cost. Use Value: Low 0.5 μA leakage at 15.2 V minimizes measurement offset error; 50 °C/W RθJL enables thermal tracking with sensor housing. | Use Scenario: Level-shifting and limiting 24 V DC field signals before entering PLC digital input optocouplers. IC Role / Device Role / Timing Role: Limits input voltage to safe clamp level while presenting high impedance to normal signal swing. Use Value: DO-220AA package allows dense placement near I/O connectors; MSL level 1 supports automated manufacturing of ruggedized PLC backplanes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C20LT1G | Same 20 V nominal Zener voltage but SOT-23 package; higher ZZT (60 Ω typical vs. 650 Ω max); lower Ptot (300 mW) | Lower power handling limits use to signal-level regulation only; unsuitable for >50 mA clamp loads | Select when board space is critical and power demand is ≤50 mW; verify thermal derating on thin PCBs |
| 1N4740A | Through-hole DO-41 package; same 20 V nominal; higher ZZT (22 Ω typical); Ptot = 1000 mW at 25 °C | Requires manual or wave soldering; incompatible with automated SMT lines; larger footprint | Select only for prototyping or legacy through-hole designs; not recommended for new SMT production |
Compared with BZX84-C20LT1G and 1N4740A, SMPZ3932B-E3/85A offers superior power handling (1500 mW at TL = 75 °C), ultra-low profile (1.0 mm), and MSL level 1 compatibility - making it optimal for high-reliability, high-density SMT power rail regulation where thermal management and assembly scalability matter.
Availability
SMPZ3932B-E3/85A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and programmable logic controller (PLC) input conditioning requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for SMPZ3932B-E3/85A 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMPZ39XB series is part of Vishay's eSMP® Zener diode family engineered for high-power density, low-profile SMT voltage regulation in automotive, industrial, and computing power systems.
FAQ
What is the Zener voltage tolerance of SMPZ3932B-E3/85A?
The SMPZ3932B-E3/85A has a Zener voltage specification of 19.0 V minimum, 20.0 V nominal, and 21.0 V maximum at 14 mA test current - corresponding to a ±5 % tolerance band around the nominal value. This tolerance is verified per the Vishay datasheet document 88482 and applies under standard test conditions at 25 °C ambient temperature. The SMPZ3932B-E3/85A maintains this specification across its qualified operating temperature range.
Does SMPZ3932B-E3/85A support lead-free reflow soldering?
Yes, SMPZ3932B-E3/85A is rated for lead-free reflow soldering with a maximum peak temperature of 260 °C for 10 seconds, meeting J-STD-020 MSL level 1 requirements. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 for solderability, and the device requires no pre-baking prior to assembly. This makes SMPZ3932B-E3/85A fully compatible with standard high-volume SMT production lines.
What is the maximum power dissipation of SMPZ3932B-E3/85A at 75 °C lead temperature?
The SMPZ3932B-E3/85A delivers 1500 mW maximum power dissipation when the lead temperature (TL) is maintained at 75 °C - significantly higher than its 500 mW rating at 25 °C ambient. This elevated rating is achievable only with proper PCB thermal design, specifically using 5.0 mm × 5.0 mm copper pads per terminal as specified in the Vishay datasheet. The SMPZ3932B-E3/85A thermal resistance junction-to-lead is 50 °C/W.
How does the reverse leakage current of SMPZ3932B-E3/85A compare at 15.2 V?
At a reverse voltage of 15.2 V - which is 76 % of its nominal Zener voltage - the SMPZ3932B-E3/85A exhibits a maximum reverse leakage current of 0.5 μA. This low leakage ensures minimal quiescent current draw in always-on protection circuits and preserves accuracy in high-impedance reference applications. The SMPZ3932B-E3/85A leakage is measured per the electrical characteristics table in document 88482 and confirmed at 25 °C ambient.
Is SMPZ3932B-E3/85A halogen-free and RoHS-compliant?
Yes, SMPZ3932B-E3/85A carries the M3 suffix, indicating it is halogen-free, RoHS-compliant, and qualified for industrial-grade applications. The molding compound meets UL 94 V-0 flammability standards, and the matte tin terminals pass JESD 201 class 1A whisker testing. These compliance attributes are documented in Vishay's official datasheet 88482 and apply directly to the SMPZ3932B-E3/85A orderable part number.
SMPZ3932B-E3/85A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- eSMP®
- Package/Case:
- DO-220AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 14 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 15.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-220AA (SMP)
SMPZ3932B-E3/85A FAQ
1.How can I place an order for SMPZ3932B-E3/85A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMPZ3932B-E3/85A 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 SMPZ3932B-E3/85A reliable?
The price and inventory of SMPZ3932B-E3/85A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMPZ3932B-E3/85A is usually 5 days.
3.What payment methods are accepted for SMPZ3932B-E3/85A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMPZ3932B-E3/85A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMPZ3932B-E3/85A?
SMPZ3932B-E3/85A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMPZ3932B-E3/85A 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 SMPZ3932B-E3/85A?
For technical support, including SMPZ3932B-E3/85A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMPZ3932B-E3/85A requirements.
6.How does Aetrix verify that SMPZ3932B-E3/85A is sourced from the original manufacturer or authorized distributors?
All SMPZ3932B-E3/85A 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 SMPZ3932B-E3/85A meets industry standards.
7.What is the process for return or replacement of SMPZ3932B-E3/85A?
All SMPZ3932B-E3/85A units undergo pre-shipment inspection (PSI). If there is an issue with SMPZ3932B-E3/85A, 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 SMPZ3932B-E3/85A part is unused and in its original packaging.
Return procedure for SMPZ3932B-E3/85A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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