My Inquiry
My Account
onsemi SZBZX84C39LT1G
- Part No.:
- SZBZX84C39LT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84C39LT1G.pdf
- Description:
- DIODE ZENER 39V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,580
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZBZX84C39LT1G from onsemi is a 39 V ±5% Zener voltage regulator diode in SOT-23 package, rated for 250 mW power dissipation on FR-5 board, with 130 Ω dynamic impedance at 5 mA test current and 70 µA max reverse leakage at 30.4 V. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the SZBZX84C39LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5%), thermal coefficient (+27.3 mV/°C), junction temperature range (−65°C to +150°C), and Pb-free RoHS-compliant SOT-23 packaging for automated assembly.
Technical Context
This device operates as a two-terminal silicon Zener diode with avalanche breakdown mechanism optimized for stable voltage regulation at 39 V. Its design targets low-current biasing applications where tight voltage accuracy and low capacitance (45 pF at 0 V) are critical.
The SOT-23 package supports surface-mount reflow soldering up to 260°C for 10 seconds, with cathode polarity marked by a band. The device is AEC-Q101 qualified and PPAP capable, meeting automotive-grade reliability requirements without requiring external bias components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 39 V nominal, 37–41 V min/max at 5 mA - defines regulated output voltage under standard test conditions |
| Power Dissipation | 250 mW on FR-5 board - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance | 130 Ω at 5 mA - indicates voltage regulation stability under small-signal AC variations |
| Reverse Leakage | 70 µA max at 30.4 V - determines minimum holding current required to maintain regulation |
| Temperature Coefficient | +27.3 mV/°C - quantifies voltage drift per degree Celsius rise in junction temperature |
| Capacitance | 45 pF at 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent circuits |
| Junction Temp Range | −65°C to +150°C - enables operation in extended industrial and automotive environments |
Pinout & Package
Package: SOT-23 (TO-236), 2.90 × 1.30 × 1.00 mm, Pb-free, void-free thermosetting plastic case with corrosion-resistant finish. Cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node in reverse-bias regulation configuration |
| 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad should tie this pin |
| 3 | Cathode | Zener breakdown terminal; connects to higher-potential node and provides regulated reference voltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and infotainment power rails |
| ESD robustness | Class 3 HBM (>16 kV) - eliminates need for external ESD protection in handheld device interfaces |
| Tight thermal coefficient control | +27.3 mV/°C - enables predictable voltage drift compensation in temperature-sensitive analog circuits |
| Pb-free & RoHS compliance | Meets global environmental regulations and supports lead-free reflow soldering profiles |
| Low capacitance | 45 pF at 0 V - minimizes loading effects in high-speed signal line clamping and RF detector circuits |
Applications
| Portable Power Management | Automotive Sensor Biasing |
|---|---|
Use Scenario: Voltage reference for ADCs and LDO feedback networks in battery-powered IoT sensors. IC Role / Device Role / Timing Role: Provides stable 39 V reference for precision analog front-end calibration. Use Value: Enables <1% total error across −40°C to +85°C ambient due to predictable +27.3 mV/°C TC and low 70 µA leakage. |
Use Scenario: Overvoltage clamp on 12 V CAN bus transceiver supply lines. IC Role / Device Role / Timing Role: Shunts transient surges above 39 V to protect downstream PHY ICs. Use Value: Limits peak rail voltage to 41 V max while maintaining <130 Ω dynamic impedance for fast response. |
| Industrial PLC Input Protection | Medical Wearable Reference |
Use Scenario: Input stage protection for 24 V digital input modules exposed to field wiring transients. IC Role / Device Role / Timing Role: Clamps induced spikes to safe levels before signal conditioning circuitry. Use Value: Withstands repeated 1 kV/µs transients per IEC 61000-4-4 due to 250 mW rating and robust SOT-23 thermal path. |
Use Scenario: Precision voltage reference for low-noise biopotential amplifier biasing in ECG patches. IC Role / Device Role / Timing Role: Supplies stable DC offset to op-amp input stages without introducing jitter. Use Value: Delivers <45 pF capacitance and <70 µA leakage to preserve signal-to-noise ratio in sub-µV measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C39LT1G | Same electrical specs but lacks AEC-Q101 qualification and SZ-prefix automotive traceability | Not suitable for automotive production; acceptable for commercial-grade consumer devices | Select when cost sensitivity outweighs automotive compliance requirements |
| SZBZX84C39LT3G | Identical electrical and mechanical specs, shipped in 10,000-piece tape-and-reel vs. 3,000-piece for SZBZX84C39LT1G | Optimized for high-volume automated placement; same performance in all operating conditions | Select for large-scale manufacturing with feeder compatibility for 10k reels |
Compared with SZBZX84C39LT1G, BZX84C39LT1G offers identical regulation performance but omits automotive qualification and process controls, while SZBZX84C39LT3G delivers identical functionality in higher-volume packaging-enabling cost-efficient scaling without design change.
Availability
SZBZX84C39LT1G is available at Aetrix Electronics and suitable for automotive sensor modules, portable medical devices, and industrial PLC input protection requiring stable component supply with full traceability and lifecycle management.
Supply support for SZBZX84C39LT1G 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 power and sensing solutions for automotive, industrial, cloud, and consumer markets.
SZBZX84C39LT1G belongs to the SZBZX84CxxxLT1G series of AEC-Q101-qualified Zener regulators designed specifically for automotive and high-reliability industrial applications demanding robust voltage reference stability.
FAQ
What is the Zener voltage tolerance of SZBZX84C39LT1G?
The SZBZX84C39LT1G has a nominal Zener voltage of 39 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 37 V and 41 V when tested at 5 mA. This tolerance is specified in the Electrical Characteristics table on page 3 of the onsemi datasheet and applies across the full operating temperature range.
Is SZBZX84C39LT1G suitable for automotive applications?
Yes, SZBZX84C39LT1G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications such as engine control unit (ECU) voltage monitoring, infotainment system power rail clamping, and ADAS sensor biasing. Its SZ prefix denotes automotive-specific process controls and traceability required for Tier 1 supply chains.
What is the maximum power dissipation of SZBZX84C39LT1G on an FR-5 board?
SZBZX84C39LT1G is rated for 250 mW total power dissipation on FR-5 board at 25°C ambient temperature. Above 25°C, it derates linearly at 2.0 mW/°C, reaching zero dissipation capability at 150°C junction temperature. This rating assumes standard JEDEC-defined board layout conditions.
Does SZBZX84C39LT1G have a built-in capacitor or additional terminals?
No, SZBZX84C39LT1G is a two-terminal Zener diode with pins 1 (anode) and 3 (cathode); pin 2 is internally unconnected. It contains no integrated capacitor or auxiliary circuitry. Its 45 pF junction capacitance is inherent to the silicon structure and measured at 0 V bias and 1 MHz frequency.
How does the temperature coefficient affect SZBZX84C39LT1G's regulation accuracy?
The SZBZX84C39LT1G has a positive temperature coefficient of +27.3 mV/°C at 5 mA, meaning its Zener voltage increases by approximately 27.3 mV for every 1°C rise in junction temperature. This must be factored into precision reference designs operating across wide temperature ranges to maintain total system accuracy.
SZBZX84C39LT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZBZX84CxxxLT1G
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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)
SZBZX84C39LT1G FAQ
1.How can I place an order for SZBZX84C39LT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84C39LT1G 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 SZBZX84C39LT1G reliable?
The price and inventory of SZBZX84C39LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C39LT1G is usually 5 days.
3.What payment methods are accepted for SZBZX84C39LT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C39LT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84C39LT1G?
SZBZX84C39LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84C39LT1G 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 SZBZX84C39LT1G?
For technical support, including SZBZX84C39LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C39LT1G requirements.
6.How does Aetrix verify that SZBZX84C39LT1G is sourced from the original manufacturer or authorized distributors?
All SZBZX84C39LT1G 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 SZBZX84C39LT1G meets industry standards.
7.What is the process for return or replacement of SZBZX84C39LT1G?
All SZBZX84C39LT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C39LT1G, 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 SZBZX84C39LT1G part is unused and in its original packaging.
Return procedure for SZBZX84C39LT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84C39LT1G 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…
