My Inquiry
My Account
onsemi SZMMBZ39VCLT3G
- Part No.:
- SZMMBZ39VCLT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ39VCLT3G.pdf
- Description:
- TVS DIODE 31.2VWM 55VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,850
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZMMBZ39VCLT3G from onsemi is a dual common-cathode 39 V Zener diode in SOT-23 package, rated for 40 W peak pulse power (1 ms), 31.2 V working reverse voltage, and ±30 kV IEC61000-4-2 contact ESD protection - used for bidirectional transient suppression on data lines in automotive ECUs and industrial communication interfaces.
For engineers reviewing the SZMMBZ39VCLT3G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage (55 V @ 0.76 A), low leakage (<50 nA @ 31.2 V), AEC-Q101 qualification, and dual-line protection capability in space-constrained PCB layouts.
Technical Context
This device integrates two monolithic Zener junctions sharing a single cathode terminal (Pin 3), enabling either independent unidirectional protection of two signal lines or combined bidirectional protection across one differential pair. Its design supports both IEC61000-4-2 Level 4 and HBM Class 3B ESD compliance without external components.
The 39 V nominal breakdown voltage (37.05–40.95 V at 1 mA) provides precise overvoltage clamping for 3.3 V/5 V/12 V bus systems, while its 556 °C/W thermal resistance on FR-5 board defines steady-state derating behavior above 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage | 37.05–40.95 V @ 1 mA - defines precise clamping threshold for 39 V-rated protection circuits |
| Working Reverse Voltage | 31.2 V - maximum continuous reverse bias before significant leakage or conduction |
| Clamping Voltage | 55 V @ 0.76 A peak pulse - limits transient voltage seen by downstream ICs during ESD events |
| Peak Pulse Power | 40 W @ 1.0 ms - sustains high-energy transients per IEC61000-4-2 waveform |
| ESD Rating | ±30 kV contact discharge (IEC61000-4-2 Level 4) - meets automotive and industrial immunity requirements |
| Leakage Current | <50 nA @ 31.2 V - ensures minimal standby power loss and signal integrity in high-impedance nodes |
| Package | SOT-23 (Case 318, Style 9) - surface-mount footprint measuring 2.90 × 1.30 × 1.00 mm for dense PCB layouts |
Pinout & Package
SOT-23 package with void-free thermosetting plastic case, UL 94 V-0 flammability rating, and Pb-free finish. Maximum solder temperature: 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode 1 | First Zener anode - connects to protected line 1 in unidirectional mode or forms one side of bidirectional path |
| Pin 2 | Anode 2 | Second Zener anode - connects to protected line 2 in unidirectional mode or completes bidirectional path |
| Pin 3 | Cathode (common) | Shared cathode node - ties both Zeners to reference (e.g., ground or supply rail) for dual-line protection |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-cathode topology | Enables two-line protection in one SOT-23 footprint - saves >50% board area vs. discrete dual-Zener solutions |
| Bidirectional configuration support | Allows single-package transient suppression across differential buses (e.g., CAN, RS-485) without polarity constraints |
| AEC-Q101 qualification | Validated for automotive under-hood and ECU applications with guaranteed reliability across −55 °C to +150 °C junction range |
| Low clamping impedance | 55 V clamping at 0.76 A ensures <10 ns response to fast ESD pulses - protects sensitive transceivers and PHYs |
| Pb-free and RoHS-compliant | Meets global environmental regulations and reflow compatibility standards for lead-free assembly processes |
Applications
| Automotive ECU Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting single-wire CAN bus lines in engine control units against load dump and ESD events per SAE J2411. IC Role / Device Role / Timing Role: Dual-line transient voltage suppressor - clamps surges on signal and ground-referenced paths simultaneously. Use Value: Eliminates need for two separate TVS devices while maintaining ≤55 V clamping on both lines during 0.76 A transients. | Use Scenario: Safeguarding RS-485 transceiver inputs in factory automation controllers exposed to cable-induced surges. IC Role / Device Role / Timing Role: Bidirectional ESD clamp - suppresses ±30 kV contact discharges on A/B differential pairs without signal distortion. Use Value: Maintains signal integrity up to 10 Mbps by limiting overshoot to 55 V with sub-10 ns response time. |
| Medical Sensor Interface | Point-of-Sale Terminal Port |
Use Scenario: Shielding analog sensor inputs (e.g., temperature, pressure) in portable medical devices from handling ESD. IC Role / Device Role / Timing Role: Low-leakage Zener clamp - blocks transients while adding <50 nA leakage at 31.2 V operating bias. Use Value: Preserves measurement accuracy in high-impedance sensor front-ends where leakage would cause offset errors. | Use Scenario: Hardening USB and serial ports in retail terminals against customer-handling ESD per IEC61000-4-2. IC Role / Device Role / Timing Role: Dual-rail protector - guards VBUS and D+/D− lines using shared cathode architecture. Use Value: Reduces BOM count by consolidating two protection paths into one 2.9 mm × 1.3 mm component. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener transient protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMBZ39VALT3G | Same 39 V breakdown but unidirectional dual-anode configuration (Pins 1/3 and 2/3), higher clamping voltage (57 V @ 0.76 A) | Requires separate cathode routing; less suitable for bidirectional bus protection | Select when discrete unidirectional line protection is preferred over common-cathode layout |
| SMF39AT1G | Single-channel 39 V TVS diode in SOD-123, 400 W peak power, 62 V clamping @ 1.0 A | Larger footprint; no dual-line integration - needs two devices for equivalent coverage | Choose for higher surge current handling where board space allows dual placement |
Compared with SZMMBZ39VCLT3G, SZMMBZ39VALT3G offers identical voltage rating but different topology for dedicated anode routing, while SMF39AT1G delivers higher surge capacity at the cost of doubled footprint and no integrated dual-line functionality.
Availability
SZMMBZ39VCLT3G is available at Aetrix Electronics and suitable for automotive ECUs, industrial RS-485 networks, medical sensor interfaces, and point-of-sale terminal ports requiring stable component supply and AEC-Q101-compliant transient protection.
Supply support for SZMMBZ39VCLT3G 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, and cloud infrastructure markets.
The SZMMBZxxVxL series is designed specifically for compact, high-reliability transient voltage suppression in space-constrained automotive and industrial electronics - emphasizing AEC-Q101 qualification, IEC61000-4-2 compliance, and dual-junction integration.
FAQ
What is the exact pin configuration of SZMMBZ39VCLT3G?
SZMMBZ39VCLT3G uses SOT-23 package Style 9: Pin 1 is Anode 1, Pin 2 is Anode 2, and Pin 3 is the common Cathode. This dual-common-cathode arrangement enables simultaneous protection of two signal lines referenced to the same rail. The configuration is confirmed in the onsemi mechanical drawings and ordering information table.
Is SZMMBZ39VCLT3G qualified for automotive use?
Yes, SZMMBZ39VCLT3G carries the "SZ" prefix indicating AEC-Q101 qualification and PPAP capability. It operates across −55 °C to +150 °C junction temperature and meets automotive ESD requirements including IEC61000-4-2 Level 4 (±30 kV contact). These qualifications are explicitly stated in the onsemi datasheet revision history and specification features.
What is the clamping voltage of SZMMBZ39VCLT3G under standard test conditions?
The clamping voltage of SZMMBZ39VCLT3G is 55 V measured at a peak pulse current of 0.76 A with a 1.0 ms waveform (Figure 5). This value is specified in the Electrical Characteristics table on page 3 of the official onsemi datasheet and defines the maximum voltage transferred to protected circuitry during transient events.
Can SZMMBZ39VCLT3G be used in bidirectional signal protection?
Yes, SZMMBZ39VCLT3G supports bidirectional protection by connecting Pins 1 and 2 to opposite sides of a differential line (e.g., CAN_H/CAN_L) and Pin 3 to ground. Its dual common-cathode structure allows symmetrical clamping in both polarities - a configuration validated in onsemi's typical application circuit for single-wire CAN networks.
What is the maximum steady-state power dissipation for SZMMBZ39VCLT3G on an FR-5 board?
SZMMBZ39VCLT3G has a total power dissipation rating of 225 mW at 25 °C ambient on FR-5 board, derating linearly by 1.8 mW/°C above that temperature. This value is listed in the Maximum Ratings table (page 2) and reflects thermal performance under continuous DC bias, distinct from its 40 W peak pulse rating.
SZMMBZ39VCLT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 31.2V
- Voltage - Breakdown (Min):
- 37.05V
- Voltage - Clamping (Max) @ Ipp:
- 55V
- Current - Peak Pulse (10/1000µs):
- 760mA
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZMMBZ39VCLT3G FAQ
1.How can I place an order for SZMMBZ39VCLT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ39VCLT3G 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 SZMMBZ39VCLT3G reliable?
The price and inventory of SZMMBZ39VCLT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ39VCLT3G is usually 5 days.
3.What payment methods are accepted for SZMMBZ39VCLT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ39VCLT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ39VCLT3G?
SZMMBZ39VCLT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ39VCLT3G 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 SZMMBZ39VCLT3G?
For technical support, including SZMMBZ39VCLT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ39VCLT3G requirements.
6.How does Aetrix verify that SZMMBZ39VCLT3G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ39VCLT3G 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 SZMMBZ39VCLT3G meets industry standards.
7.What is the process for return or replacement of SZMMBZ39VCLT3G?
All SZMMBZ39VCLT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ39VCLT3G, 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 SZMMBZ39VCLT3G part is unused and in its original packaging.
Return procedure for SZMMBZ39VCLT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ39VCLT3G Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
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…
