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onsemi 1SMA5915BT3
- Part No.:
- 1SMA5915BT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5915BT3.pdf
- Description:
- DIODE ZENER 3.9V 1.5W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:7,082
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Product details
Overview
1SMA5915BT3 from onsemi is a 1.5 W surface-mount Zener diode with nominal zener voltage of 3.9 V (±5%), maximum zener impedance of 96.1 Ω at 7.5 mA test current, and reverse leakage current ≤12.5 μA at 1.0 V. It operates from −65 °C to +150 °C and is rated for automotive-grade reliability per AEC-Q101.
For engineers reviewing the 1SMA5915BT3 datasheet, pinout, applications, or equivalent options, this device serves as a precision low-voltage reference and overvoltage clamp in power supply regulation, voltage monitoring, and ESD-protected signal conditioning circuits where stable 3.9 V regulation under 7.5 mA bias is required.
Technical Context
The 1SMA5915BT3 is a silicon planar Zener diode optimized for stable reverse-bias breakdown at 3.9 V with tight ±5% tolerance. Its thermal resistance junction-to-lead is 50 °C/W, enabling 1.5 W dissipation at TL = 75 °C with proper PCB copper pad design.
It features Class 3 ESD rating (>16 kV HBM), Pb-free SMA package (Case 403D-02), and flat handling surface for automated placement. The cathode is marked by a molded band, and polarity is unambiguous for board-level assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.70–4.10 V @ IZT = 7.5 mA - defines regulated output voltage range under standard test conditions |
| Power Dissipation (PD) | 1.5 W @ TL = 75 °C - requires ≥1 in² FR-4 copper pad for full rating; derates 20 mW/°C above 75 °C |
| Zener Impedance (ZZT) | 96.1 Ω max @ IZT = 7.5 mA - determines AC regulation stability and ripple rejection in feedback paths |
| Reverse Leakage (IR) | ≤12.5 μA @ VR = 1.0 V - ensures minimal quiescent current draw in low-power standby circuits |
| Max DC Zener Current (IZM) | 385 mA - sets absolute upper limit for continuous conduction without thermal runaway |
| Operating Temp Range | −65 °C to +150 °C - supports under-hood automotive, industrial control, and wide-temperature embedded applications |
| ESD Rating | Class 3 (>16 kV HBM) - provides robustness against handling and system-level electrostatic discharge events |
Pinout & Package
Package: SMA (DO-214AC), Case 403D-02 - surface-mount plastic package with flat top surface, cathode band marking, and lead pitch of 2.29–2.92 mm (E dimension). Designed for top-slide or bottom-board mounting on FR-4 PCBs with minimum recommended footprint per ON Semiconductor BRD8011/D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | High-side terminal in reverse-bias configuration | Connected to regulated voltage node; must be held at higher potential than anode during Zener operation |
| Anode | Low-side terminal in reverse-bias configuration | Typically tied to ground or return path; establishes reference potential for clamping/regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use with PPAP capability and controlled site change requirements (SZ prefix variant) |
| Low-profile SMA package | Height ≤1.52 mm (max) enables compact layout in space-constrained modules and portable devices |
| Class 3 ESD protection | Withstands >16 kV human-body-model discharge without parameter shift - reduces need for external TVS in many interfaces |
| Pb-free construction | RoHS-compliant materials and soldering profile compatible with 260 °C / 10 s reflow per JEDEC J-STD-020 |
| Flat handling surface | Enables high-accuracy pick-and-place placement with <±0.1 mm positional tolerance on SMT lines |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for microcontroller ADC inputs in door module ECUs exposed to load dump transients. IC Role / Device Role / Timing Role: Zener voltage reference and transient clamp protecting analog front-end from >40 V surges. Use Value: Maintains 3.9 V reference accuracy across −40 °C to +125 °C ambient while surviving ISO 7637-2 pulse 5a without degradation. |
Use Scenario: Biasing and clamping thermistor bridge outputs in HVAC temperature sensors operating in factory environments. IC Role / Device Role / Timing Role: Precision shunt regulator establishing stable excitation voltage and limiting common-mode swing to protect op-amp inputs. Use Value: Delivers <12.5 μA leakage at 1.0 V to minimize offset error, with 96.1 Ω dynamic impedance ensuring <0.5% line regulation over 5–10 mA load variation. |
| USB-C Power Delivery Monitor | Medical Patient Monitor Analog Front-End |
Use Scenario: Clamping CC line voltage during USB-C negotiation to prevent overvoltage damage to PD controller ICs. IC Role / Device Role / Timing Role: Fast-response overvoltage protector on 3.3 V–5 V communication lines with ESD hardening. Use Value: Leverages >16 kV HBM rating and 3.9 V breakdown to absorb ESD events and transient spikes without latch-up or parametric drift. |
Use Scenario: Providing isolated, low-noise 3.9 V reference for precision instrumentation amplifiers measuring biopotentials. IC Role / Device Role / Timing Role: Low-leakage shunt reference stabilizing gain-setting networks in ultra-low-input-bias-current signal chains. Use Value: Enables <1 pA input bias current contribution due to ≤12.5 μA leakage, critical for sub-μV signal integrity in EEG/ECG front-ends. |
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-C3V9 | 0.3 W rating, SOT-23 package, 3.9 V ±5%, ZZT = 95 Ω @ 5 mA | Lower power handling; suitable only for signal-level biasing, not power regulation | Select when board space is critical and dissipation remains <300 mW; verify thermal relief on SOT-23 pad |
| 1N4735A | 1 W through-hole DO-41, 6.2 V nominal, ZZT = 5 Ω @ 20 mA - different voltage and package | Not a direct voltage match; requires redesign for 6.2 V systems; incompatible with SMT assembly | Choose only if legacy through-hole design mandates DO-41 footprint and 6.2 V regulation is acceptable |
Compared with BZX84-C3V9 and 1N4735A, the 1SMA5915BT3 uniquely delivers 1.5 W surface-mount Zener regulation at 3.9 V with AEC-Q101 qualification and >16 kV ESD - making it the only option among the three suitable for automotive-grade, high-reliability, medium-power SMT applications.
Availability
1SMA5915BT3 is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor transmitters, USB-C power delivery monitors, and medical analog front-ends requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1SMA5915BT3 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 specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1SMA5915BT3 belongs to the 1SMA59xxBT3/SZ1SMA59xxBT3G family of 1.5 W surface-mount Zener regulators designed specifically for high-reliability, space-constrained applications demanding AEC-Q101 compliance and robust ESD immunity.
FAQ
What is the exact zener voltage tolerance for 1SMA5915BT3?
The 1SMA5915BT3 has a nominal zener voltage of 3.9 V with a guaranteed tolerance of ±5%, meaning the actual measured VZ falls between 3.70 V and 4.10 V when tested at IZT = 7.5 mA and thermal equilibrium. This tolerance is explicitly defined in the Electrical Characteristics table on page 2 of the official datasheet (Rev. 7, November 2011).
Can 1SMA5915BT3 replace older through-hole Zeners like 1N4734A?
No - the 1SMA5915BT3 is not a drop-in replacement for 1N4734A. While both are Zener diodes, 1N4734A is a 5.6 V, 1 W DO-41 device with different voltage, power rating, and package. The 1SMA5915BT3 is a 3.9 V, 1.5 W SMA device. Direct substitution would require circuit redesign, PCB layout changes, and verification of thermal performance under load.
Is 1SMA5915BT3 suitable for automotive applications?
Yes - the SZ-prefix variant (SZ1SMA5915BT3G) is AEC-Q101 qualified and PPAP capable, meeting automotive reliability standards. The 1SMA5915BT3 itself shares identical electrical and thermal specifications but lacks formal automotive certification documentation; for production automotive use, the SZ1SMA5915BT3G variant must be specified and sourced.
What is the maximum allowable junction temperature for 1SMA5915BT3?
The 1SMA5915BT3 has an operating junction temperature range of −65 °C to +150 °C. Its absolute maximum junction temperature is +150 °C. Exceeding this limit risks permanent parametric shift or catastrophic failure. Thermal design must ensure TJ stays within this bound using the published RJA = 250 °C/W and RJL = 50 °C/W values with appropriate PCB copper area.
Does 1SMA5915BT3 have Pb-free packaging?
Yes - the "G" suffix in the ordering code (e.g., 1SMA5915BT3G or SZ1SMA5915BT3G) explicitly denotes Pb-free construction compliant with RoHS Directive 2011/65/EU. The device uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1, supporting standard reflow profiles up to 260 °C for 10 seconds.
1SMA5915BT3 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):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 7.5 Ohms
- Current - Reverse Leakage @ Vr:
- 12.5 µA @ 1 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
1SMA5915BT3 FAQ
1.How can I place an order for 1SMA5915BT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5915BT3 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 1SMA5915BT3 reliable?
The price and inventory of 1SMA5915BT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5915BT3 is usually 5 days.
3.What payment methods are accepted for 1SMA5915BT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5915BT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5915BT3?
1SMA5915BT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5915BT3 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 1SMA5915BT3?
For technical support, including 1SMA5915BT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5915BT3 requirements.
6.How does Aetrix verify that 1SMA5915BT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA5915BT3 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 1SMA5915BT3 meets industry standards.
7.What is the process for return or replacement of 1SMA5915BT3?
All 1SMA5915BT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5915BT3, 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 1SMA5915BT3 part is unused and in its original packaging.
Return procedure for 1SMA5915BT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA5915BT3 Tags
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