My Inquiry
My Account
onsemi SZBZX84C43LT1
- Part No.:
- SZBZX84C43LT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C43LT1.pdf
- Description:
- DIODE ZENER 43V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:54,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZBZX84C43LT1 from onsemi is a 43 V ±7% Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 150 Ω dynamic impedance at 5 mA test current and 0.05 μA reverse leakage at 30 V, used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the SZBZX84C43LT1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±7%), thermal coefficient (+30.1 mV/°C), junction-to-ambient thermal resistance (556 °C/W), and Pb-free SOT-23 package compatibility with automated assembly.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across varying load currents by conducting excess current to ground when input exceeds 43 V nominal. Its Zener breakdown mechanism provides predictable reverse conduction with low dynamic impedance (150 Ω @ 5 mA) and tight voltage control under pulse-test conditions.
The SZBZX84C43LT1 features Class 3 ESD rating (>16 kV HBM), AEC-Q101 qualification for automotive use, and operates across −65°C to +150°C junction temperature range. Its SOT-23 package includes cathode band marking, void-free thermosetting plastic case, and UL 94 V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 40–46 V @ 5 mA; defines regulated clamp voltage for overvoltage protection circuits |
| Power Dissipation | 225 mW on FR-5 board @ 25°C; sets maximum continuous power handling before thermal derating |
| Zener Impedance | 150 Ω @ 5 mA; determines regulation accuracy under dynamic load transients |
| Reverse Leakage | 0.05 μA @ 30 V; ensures minimal standby current in high-impedance bias networks |
| Temp Coefficient | +30.1 mV/°C @ 5 mA; quantifies voltage drift per degree Celsius in temperature-sensitive references |
| Capacitance | 40 pF @ 0 V, 1 MHz; impacts high-frequency noise filtering and signal integrity in RF-adjacent layouts |
| ESD Rating | Class 3 (>16 kV HBM); supports robust handling in manual assembly and field-replaceable modules |
Pinout & Package
SOT-23 surface-mount package (Case 318, Style 8), 3-pin configuration with cathode marked by band; optimized for high-density PCBs and automated pick-and-place assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; current flows into cathode during Zener conduction |
| 2 | No Connection | Internally unconnected; no electrical function or PCB trace required |
| 3 | Cathode | Connected to regulated voltage rail; polarity band identifies this terminal for correct orientation |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW FR-5 Power Rating | Enables compact voltage clamping without heatsinking in space-constrained handheld designs |
| ±7% Zener Tolerance | Provides predictable regulation window for cost-sensitive consumer and industrial power monitoring |
| AEC-Q101 Qualified | Validates reliability for automotive body electronics, infotainment power supplies, and ADAS subsystems |
| Pb-Free SOT-23 Package | Meets RoHS compliance requirements and supports lead-free reflow soldering profiles up to 260°C |
| 16 kV HBM ESD Robustness | Eliminates need for external ESD protection in battery-powered devices exposed to user handling |
Applications
| Cellular Phone Power Management | Automotive Body Control Module |
|---|---|
Use Scenario: Clamping 5 V USB charging rail against surge events in smartphone PMIC input stage. IC Role / Device Role / Timing Role: Shunt regulator providing overvoltage protection for downstream LDOs and battery charge controllers. Use Value: Prevents damage to sensitive analog circuitry using only 43 V Zener threshold and 150 Ω dynamic impedance to limit transient energy. | Use Scenario: Stabilizing 12 V supply to microcontroller I/O pins in door module ECUs. IC Role / Device Role / Timing Role: Voltage reference and transient suppressor for CAN transceiver bias rails. Use Value: Maintains logic-level integrity during load-dump events with AEC-Q101 qualification and −65°C to +150°C operation. |
| Industrial Sensor Signal Conditioning | Medical Portable Monitor Power Rail |
Use Scenario: Biasing op-amp reference inputs in 4–20 mA loop transmitter front-ends. IC Role / Device Role / Timing Role: Precision voltage reference establishing stable 43 V headroom for analog signal chain biasing. Use Value: Delivers <0.05 μA leakage and +30.1 mV/°C tempco for repeatable calibration across ambient temperature shifts. | Use Scenario: Protecting lithium-ion battery management ICs from overvoltage during fast-charging cycles. IC Role / Device Role / Timing Role: Secondary overvoltage clamp activated after primary protection fails. Use Value: Adds fail-safe redundancy with Pb-free SOT-23 footprint compatible with medical-grade reflow processes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C43LT1 | Same electrical specs but non-automotive grade; lacks AEC-Q101 qualification and SZ prefix | Not suitable for automotive environments requiring PPAP documentation or extended temperature validation | Select BZX84C43LT1 only for cost-sensitive consumer electronics where automotive reliability is not required |
| SZBZX84C43LT1G | Identical electrical and thermal specs; differs only in Pb-free marking suffix and tape/reel packaging | No functional difference; both meet RoHS and support same solder profiles | Choose SZBZX84C43LT1G when full Pb-free compliance documentation and traceability are mandated |
Compared with SZBZX84C43LT1, BZX84C43LT1 omits automotive qualification and process controls, while SZBZX84C43LT1G adds formal Pb-free certification-both share identical Zener voltage, impedance, and thermal behavior in circuit design.
Availability
SZBZX84C43LT1 is available at Aetrix Electronics and suitable for cellular phone power management, automotive body control modules, and industrial sensor signal conditioning requiring stable component supply across production lifecycles.
Supply support for SZBZX84C43LT1 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The BZX84CxxxLT1 series delivers standardized Zener regulation in SOT-23 packages for cost-sensitive, high-volume voltage reference and protection tasks across portable and automotive electronics.
FAQ
What is the nominal Zener voltage and tolerance of SZBZX84C43LT1?
The SZBZX84C43LT1 has a nominal Zener voltage of 43 V with a tolerance of ±7%, specified as 40–46 V at 5 mA test current. This range ensures reliable clamping performance in power supply protection circuits where precise voltage thresholds are required. The SZBZX84C43LT1 maintains this specification under standard test conditions at 25°C ambient temperature.
Does SZBZX84C43LT1 support automotive applications?
Yes, SZBZX84C43LT1 is AEC-Q101 qualified and PPAP capable, making it suitable for automotive body electronics, infotainment systems, and ADAS power domains. Its −65°C to +150°C junction temperature range, Class 3 ESD rating, and controlled manufacturing site requirements (indicated by the "SZ" prefix) validate its use in vehicle environments. The SZBZX84C43LT1 meets automotive reliability standards without requiring derating in typical under-hood conditions.
What is the thermal resistance and power derating behavior of SZBZX84C43LT1?
SZBZX84C43LT1 has a junction-to-ambient thermal resistance of 556 °C/W on FR-5 board, with 225 mW total power dissipation at 25°C that derates linearly at 1.8 mW/°C above that temperature. This means at 75°C ambient, maximum allowable power drops to 135 mW. The SZBZX84C43LT1's thermal profile supports operation in sealed enclosures without forced airflow when power dissipation remains within calculated limits.
How is the pinout configured for SZBZX84C43LT1 in SOT-23 package?
The SZBZX84C43LT1 uses standard SOT-23 pinout: Pin 1 is Anode, Pin 2 is No Connection (unbonded), and Pin 3 is Cathode-identified by a visible polarity band on the package. This configuration enables direct integration into existing Zener-based clamp circuits without layout modification. The SZBZX84C43LT1's pinout matches industry-standard SOT-23 Zener diodes, ensuring compatibility with automated assembly tooling and footprint libraries.
Is SZBZX84C43LT1 RoHS compliant and what soldering profile does it support?
Yes, SZBZX84C43LT1 is Pb-free and RoHS compliant, with maximum soldering temperature of 260°C for 10 seconds per JEDEC J-STD-020. It supports standard lead-free reflow profiles including peak temperatures up to 260°C and time above liquidus of 60–150 seconds. The SZBZX84C43LT1's thermosetting plastic case and corrosion-resistant finish ensure reliable solder joint formation without delamination or pad lifting during repeated thermal cycling.
SZBZX84C43LT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±7%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZBZX84C43LT1 FAQ
1.How can I place an order for SZBZX84C43LT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C43LT1 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 SZBZX84C43LT1 reliable?
The price and inventory of SZBZX84C43LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C43LT1 is usually 5 days.
3.What payment methods are accepted for SZBZX84C43LT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C43LT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C43LT1?
SZBZX84C43LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C43LT1 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 SZBZX84C43LT1?
For technical support, including SZBZX84C43LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C43LT1 requirements.
6.How does Aetrix verify that SZBZX84C43LT1 is sourced from the original manufacturer or authorized distributors?
All SZBZX84C43LT1 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 SZBZX84C43LT1 meets industry standards.
7.What is the process for return or replacement of SZBZX84C43LT1?
All SZBZX84C43LT1 units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C43LT1, 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 SZBZX84C43LT1 part is unused and in its original packaging.
Return procedure for SZBZX84C43LT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84C43LT1 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…
