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onsemi 1SMA5932BT3
- Part No.:
- 1SMA5932BT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5932BT3.pdf
- Description:
- DIODE ZENER 20V 1.5W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:7,407
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Product details
Overview
1SMA5932BT3 from onsemi is a 1.5 W surface-mount Zener diode with nominal zener voltage of 20 V (±5%), maximum zener impedance of 18.7 Ω at 14 mA test current, and reverse leakage current ≤0.25 μA at 15.2 V. It operates from −65 °C to +150 °C and is qualified to AEC−Q101 for automotive applications.
For engineers reviewing the 1SMA5932BT3 datasheet, pinout, applications, or equivalent options, key selection factors include its 20 V regulation tolerance, low-profile SMA package compatibility with automated placement, Pb-free compliance, and thermal derating behavior above 75 °C.
Technical Context
This device functions as a precision voltage reference and overvoltage clamp in DC power rails and signal conditioning circuits. Its 20 V nominal breakdown is specified at IZT = 14 mA, with dynamic impedance tightly controlled at ≤18.7 Ω and temperature coefficient optimized for stability across −65 °C to +150 °C.
The 1SMA5932BT3 uses a void-free transfer-molded plastic case (CASE 403D−02) with cathode indicated by a molded band, rated for 260 °C soldering (10 s), UL 94 V−0 flammability, and ESD robustness >16 kV (HBM Class 3).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19 V min / 20 V nom / 21 V max at IZT = 14 mA - defines stable regulation window for 20 V rail protection |
| Power Dissipation (PD) | 1.5 W @ TL = 75 °C - supports high-reliability operation with copper pad heatsinking |
| Zener Impedance (ZZT) | ≤18.7 Ω @ IZT = 14 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | ≤0.25 μA @ VR = 15.2 V - enables low-power standby mode without significant quiescent loss |
| Thermal Resistance (RJA) | 250 °C/W @ TA = 25 °C - requires PCB thermal relief design for sustained 0.5 W ambient operation |
| ESD Rating | Class 3 (>16 kV HBM) - withstands handling and board-level ESD events without parameter shift |
| Operating Temperature | −65 °C to +150 °C - validated for under-hood automotive and industrial control environments |
Pinout & Package
Package: SMA (DO-214AC), CASE 403D−02, surface-mount plastic package with flat handling surface and cathode polarity band. Dimensions: 4.06–4.57 mm length × 2.29–2.92 mm width × 1.97–2.20 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Regulated output node | Connected to positive rail; reverse-biased operation establishes fixed reference voltage |
| Anode | Reference ground return | Connected to circuit common; completes bias path during zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualification | Validated for automotive electronics including engine control units and body modules |
| Pb−Free (G-suffix) packaging | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profiles |
| Low-profile SMA footprint | Replaces MELF diodes without requiring PCB redesign or pick-and-place tooling changes |
| ESD robustness >16 kV (HBM) | Eliminates need for external ESD protection in sensor interface and I/O line applications |
| Flat handling surface | Enables high-accuracy automated optical alignment during SMT placement |
Applications
| Automotive Power Rail Clamp | Industrial Sensor Reference |
|---|---|
Use Scenario: Clamping transient spikes on 24 V battery-fed ECUs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to shunt excess energy and hold rail voltage ≤21 V. Use Value: Prevents damage to downstream 20 V-tolerant microcontrollers and CAN transceivers during 120 V/50 ms load dump events. |
Use Scenario: Providing stable 20 V reference for 16-bit ADC front-end in programmable logic controller analog input modules. IC Role / Device Role / Timing Role: Precision voltage reference source with low dynamic impedance to minimize code spread under varying supply conditions. Use Value: Maintains <±0.5 LSB error across temperature due to tight 20 V ±5% tolerance and low 18.7 Ω ZZT. |
| DC-DC Converter Feedback | Overvoltage Protection Circuit |
Use Scenario: Setting regulated output voltage in isolated flyback converters using optocoupler feedback loop. IC Role / Device Role / Timing Role: Zener element in secondary-side voltage divider that triggers optocoupler LED when output exceeds 20 V threshold. Use Value: Enables ±1% output regulation accuracy with minimal component count and no external op-amp. |
Use Scenario: Safeguarding FPGA I/O banks rated for 20 V absolute maximum by limiting input voltage during hot-swap or surge events. IC Role / Device Role / Timing Role: Fast-acting clamping diode that conducts within nanoseconds when input exceeds 21 V. Use Value: Limits transient overvoltage to safe levels before internal protection structures activate, extending device lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C20LT1G | 0.3 W rating, SOT-23 package, 20 V ±5%, ZZT = 50 Ω @ 5 mA | Lower power handling limits use in <0.3 W bias networks; smaller footprint suits space-constrained designs | Select when board area is critical and peak dissipation remains below 300 mW |
| SMBJ20A | TVS diode, 20 V standoff, 300 W peak pulse power, bidirectional, 1.5 kW surge capability | Designed for transient suppression, not precision regulation; higher leakage (5 μA @ 16.3 V) | Choose for surge-only protection where DC regulation accuracy is secondary to ESD/ISO pulse immunity |
Compared with BZX84-C20LT1G and SMBJ20A, the 1SMA5932BT3 delivers superior DC regulation stability at 1.5 W continuous dissipation, making it optimal for precision reference and active clamp roles where low ZZT and tight VZ tolerance are mandatory.
Availability
1SMA5932BT3 is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interfaces, DC-DC converter feedback loops, and overvoltage protection circuits requiring stable component supply and AEC−Q101 compliance.
Supply support for 1SMA5932BT3 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The 1SMA59xxBT3 series belongs to onsemi's high-reliability Zener regulator product line, engineered specifically for automotive-grade voltage reference and clamping in harsh-environment electronic control units.
FAQ
What is the exact zener voltage tolerance for 1SMA5932BT3?
The 1SMA5932BT3 has a zener voltage tolerance of ±5% at IZT = 14 mA, with guaranteed minimum/maximum values of 19 V and 21 V respectively. This tolerance is explicitly defined in the Electrical Characteristics table on page 2 of the official datasheet (Rev. 7, November 2011), and applies to all units marked "SZ/1SMA5932BT3, G".
Is 1SMA5932BT3 suitable for automotive applications?
Yes, the 1SMA5932BT3 is AEC−Q101 qualified and PPAP capable, as confirmed in the Features section of the datasheet. The "SZ" prefix denotes automotive-grade manufacturing controls, and the device is rated for operation from −65 °C to +150 °C - meeting requirements for engine bay and transmission control module deployments.
What does the "G" suffix mean in 1SMA5932BT3G?
The "G" suffix in 1SMA5932BT3G indicates a Pb−free (RoHS-compliant) package, verified in the Ordering Information and Device Marking sections of the datasheet. All electrical and thermal specifications remain identical to the non-G version; only the termination finish and environmental compliance differ.
What is the maximum DC zener current (IZM) for 1SMA5932BT3?
The maximum DC zener current for 1SMA5932BT3 is 75 mA, calculated from PD = 1.5 W and VZ = 20 V (nominal). This value is consistent with the "IZM" column in the Electrical Characteristics table on page 2, which lists 75 mA for this part number.
Can 1SMA5932BT3 replace older MELF zener diodes?
Yes, the 1SMA5932BT3 is explicitly positioned as an ideal replacement for MELF packages per the datasheet Features section. Its SMA (DO-214AC) footprint offers equivalent power handling (1.5 W) and thermal performance while enabling standard SMT assembly - eliminating manual placement and improving process yield.
1SMA5932BT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 1SMA59xxBT3G
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 14 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 15.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA5932BT3 FAQ
1.How can I place an order for 1SMA5932BT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5932BT3 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 1SMA5932BT3 reliable?
The price and inventory of 1SMA5932BT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5932BT3 is usually 5 days.
3.What payment methods are accepted for 1SMA5932BT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5932BT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5932BT3?
1SMA5932BT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5932BT3 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 1SMA5932BT3?
For technical support, including 1SMA5932BT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5932BT3 requirements.
6.How does Aetrix verify that 1SMA5932BT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA5932BT3 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 1SMA5932BT3 meets industry standards.
7.What is the process for return or replacement of 1SMA5932BT3?
All 1SMA5932BT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5932BT3, 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 1SMA5932BT3 part is unused and in its original packaging.
Return procedure for 1SMA5932BT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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