My Inquiry
My Account
onsemi SZ1SMA5915BT3G
- Part No.:
- SZ1SMA5915BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SZ1SMA5915BT3G.pdf
- Description:
- DIODE ZENER 3.9V 1.5W SMA
- Quantity:
- Payment:
- Shipping:
Inventory:1,994
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZ1SMA5915BT3G from onsemi is a 1.5 W surface-mount Zener diode with nominal zener voltage 3.9 V, maximum zener impedance 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 AEC−Q101 qualified for automotive applications requiring stable voltage regulation in power supply rails and overvoltage protection circuits.
For engineers reviewing the SZ1SMA5915BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±5%), thermal resistance (250 °C/W at TA = 25 °C), DC power dissipation (0.5 W at 25 °C), and Pb−free SMA package compatibility with automated SMT assembly.
Technical Context
This device functions as a precision voltage reference and clamping element in low-power DC circuits. Its zener breakdown is specified at IZT = 7.5 mA with VZ = 3.70–4.10 V, and it maintains low dynamic impedance (ZZT = 96.1 Ω) and tight regulation under varying load conditions.
The SMA package enables top-slide or bottom-board mounting with flat handling surface and cathode polarity band. Thermal derating begins at 25 °C (4.0 mW/°C) and junction-to-ambient thermal resistance is 250 °C/W, limiting usable power in ambient-constrained environments.
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 |
| Zener Impedance (ZZT) | 96.1 Ω max @ IZT = 7.5 mA - determines voltage stability under small-signal AC load variations |
| Max Power Dissipation (PD) | 0.5 W @ TA = 25 °C - sets absolute upper limit for continuous DC power in free-air operation |
| Reverse Leakage (IR) | ≤12.5 μA @ VR = 1.0 V - ensures minimal quiescent current in standby or undervoltage states |
| Thermal Resistance (RJA) | 250 °C/W - quantifies temperature rise per watt in standard FR-4 layout; requires thermal pad design for >0.2 W use |
| Operating Temp Range | −65 °C to +150 °C - supports under-hood automotive, industrial control, and wide-temperature embedded systems |
| AEC−Q101 Qualified | Yes - validates reliability for automotive electronics including body control modules and sensor interfaces |
Pinout & Package
SMA package (Case 403D, Style 1), surface-mount, Pb−free, with molded cathode polarity notch/band. Dimensions conform to JEDEC standard for SMA discrete diodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked side) | Zener breakdown terminal | Connected to higher potential node; regulates voltage across anode–cathode when reverse biased |
| Anode | Reference/return terminal | Typically tied to ground or low-side rail; completes reverse-bias path for zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| ESD robustness | Class 3 (>16 kV HBM) - withstands handling and board-level ESD events without parameter shift |
| Low-profile mounting | Flat handling surface - enables high-accuracy pick-and-place placement and reduces tombstoning risk |
| Automotive qualification | AEC−Q101 certified - meets stress testing requirements for automotive grade components |
| Pb−free construction | RoHS-compliant materials and soldering profile - compatible with lead-free reflow processes up to 260 °C/10 s |
| Wide temp operation | −65 °C to +150 °C - eliminates need for derating in engine bay or industrial enclosures |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 3.3 V reference for microcontroller I/O and CAN transceiver bias in BCM subassemblies. IC Role / Device Role / Timing Role: Zener voltage clamp providing stable 3.9 V reference point for analog front-end circuitry. Use Value: Maintains ±5% regulation across temperature and load, ensuring ADC accuracy and logic-level compatibility without external LDO. | Use Scenario: Protecting 4–20 mA loop transmitter inputs from transient overvoltage during field wiring faults. IC Role / Device Role / Timing Role: Reverse-biased clamping diode shunting surge energy to ground before reaching sensitive op-amps. Use Value: Limits input voltage to ≤4.1 V with <12.5 μA leakage at 1 V, preserving signal integrity and preventing latch-up. |
| Consumer Power Adapter Feedback | Medical Diagnostic Equipment Bias Supply |
Use Scenario: Providing feedback voltage to optocoupler in isolated flyback converter secondary-side regulation. IC Role / Device Role / Timing Role: Precision zener reference establishing error amplifier setpoint for output voltage control. Use Value: Delivers 3.9 V ±5% with 96.1 Ω dynamic impedance, enabling <1% output voltage drift over line/load/temperature. | Use Scenario: Generating stable bias for photodiode preamplifiers in portable ultrasound front-ends. IC Role / Device Role / Timing Role: Low-noise voltage reference stabilizing op-amp operating point in low-current analog chains. Use Value: Enables sub-μA leakage and 150 °C max junction temperature, supporting compact sealed enclosure designs. |
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, 300 mW max PD at 25 °C vs. 500 mW for SZ1SMA5915BT3G | Lower power density; suitable only for signal-level clamping, not power rail regulation | Select BZX84-C3V9 only when board space is critical and power dissipation remains below 150 mW |
| 1N4733A | Through-hole DO-41 package, 1 W rating, no AEC−Q101 qualification, 200 °C/W RJA | Not suitable for automated SMT production or automotive qualification requirements | Choose 1N4733A only for prototyping or legacy through-hole designs where rework tolerance is prioritized over volume manufacturability |
Compared with BZX84-C3V9 and 1N4733A, SZ1SMA5915BT3G delivers higher power handling (0.5 W), superior thermal performance in SMT layouts, and automotive-grade reliability-making it optimal for production-grade automotive and industrial power management where both regulation accuracy and process compatibility matter.
Availability
SZ1SMA5915BT3G is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, and consumer power adapter feedback circuits requiring stable component supply, AEC−Q101 compliance, and Pb−free SMT compatibility.
Supply support for SZ1SMA5915BT3G 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
SZ1SMA59xxBT3G belongs to onsemi's AEC−Q101-qualified Zener regulator family designed specifically for automotive voltage reference and overvoltage protection in harsh-environment electronic control units.
FAQ
What is the zener voltage tolerance of SZ1SMA5915BT3G?
SZ1SMA5915BT3G has a zener voltage tolerance of ±5%, with minimum, nominal, and maximum values of 3.70 V, 3.9 V, and 4.10 V respectively, measured at IZT = 7.5 mA and thermal equilibrium. This tolerance is guaranteed per the device marking designation and applies across its full operating temperature range.
Is SZ1SMA5915BT3G suitable for automotive applications?
Yes, SZ1SMA5915BT3G is AEC−Q101 qualified and PPAP capable, with explicit automotive qualification noted in its SZ-prefix nomenclature. It meets stress testing requirements for temperature cycling, humidity, mechanical shock, and ESD, making it appropriate for under-hood and chassis-mounted automotive electronics.
What is the maximum DC zener current (IZM) for SZ1SMA5915BT3G?
The maximum DC zener current IZM for SZ1SMA5915BT3G is 385 mA, calculated from PD = 0.5 W and VZ = 1.3 × 3.9 V ≈ 5.07 V (worst-case forward drop included). This value assumes operation at TA = 25 °C with proper PCB thermal relief.
Does SZ1SMA5915BT3G have Pb−free packaging?
Yes, SZ1SMA5915BT3G is a Pb−free device in an RoHS-compliant SMA package, marked with "G" suffix and qualified for lead-free reflow soldering up to 260 °C for 10 seconds. Its void-free transfer-molded plastic case meets UL 94 V−0 flammability rating.
What is the thermal resistance junction-to-ambient (RJA) for SZ1SMA5915BT3G?
SZ1SMA5915BT3G has a thermal resistance RJA of 250 °C/W when mounted on an FR-4 board using onsemi's minimum recommended footprint. Derating begins above 25 °C at 4.0 mW/°C, meaning usable power drops to ~0.3 W at 75 °C ambient.
SZ1SMA5915BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZ1SMA59xxBT3G
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SZ1SMA5915BT3G FAQ
1.How can I place an order for SZ1SMA5915BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMA5915BT3G 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 SZ1SMA5915BT3G reliable?
The price and inventory of SZ1SMA5915BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMA5915BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMA5915BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMA5915BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMA5915BT3G?
SZ1SMA5915BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMA5915BT3G 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 SZ1SMA5915BT3G?
For technical support, including SZ1SMA5915BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMA5915BT3G requirements.
6.How does Aetrix verify that SZ1SMA5915BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMA5915BT3G 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 SZ1SMA5915BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMA5915BT3G?
All SZ1SMA5915BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMA5915BT3G, 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 SZ1SMA5915BT3G part is unused and in its original packaging.
Return procedure for SZ1SMA5915BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZ1SMA5915BT3G Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
