My Inquiry
My Account
onsemi SZMMBZ27VAWT1G
- Part No.:
- SZMMBZ27VAWT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
SZMMBZ27VAWT1G.pdf
- Description:
- TVS DIODE 22VWM 40VC SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:254
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZMMBZ27VAWT1G from onsemi is a dual common-anode Zener diode array designed for transient voltage suppression and ESD protection in signal lines. It features a nominal Zener breakdown voltage of 27 V (min 25.65 V, max 28.35 V), 40 W peak pulse power at 1.0 ms, clamping voltage of 40 V at 1.0 A peak pulse current, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SZMMBZ27VAWT1G datasheet, pinout, applications, or equivalent options, this device serves as a space-saving dual-line TVS solution with verified bidirectional/unidirectional configuration flexibility, Class 3B (>16 kV HBM) ESD rating, and SC-70 package compatibility for high-density PCB layouts.
Technical Context
The SZMMBZ27VAWT1G integrates two monolithic Zener junctions sharing a common anode (Pin 3), enabling independent protection of two signal paths-e.g., differential pairs or redundant control lines-with single-package footprint efficiency. Its unidirectional operation supports standard DC-biased line protection, while bidirectional mode (via external biasing) accommodates AC-coupled or floating interfaces.
Designed for fast transient response, it delivers 40 V clamping voltage at 1.0 A IPP under the Figure 5 rectangular pulse waveform, with thermal resistance RJA = 618 °C/W and operating junction temperature range from −55 °C to +150 °C-critical for under-hood automotive modules and medical sensor interfaces requiring robust thermal margin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VBR) | 27 V nominal, 25.65–28.35 V range at 1 mA test current-ensures precise overvoltage threshold alignment for 24 V system rails. |
| Clamping Voltage (VC) | 40 V at 1.0 A peak pulse current-limits transient energy delivered to downstream ICs during ESD or surge events. |
| Peak Pulse Power | 40 W at 1.0 ms per IEC 61000-4-2 waveform-meets Level 4 ESD immunity requirements without derating. |
| ESD Rating | Class 3B (>16 kV HBM), Class C (>400 V MM)-validates suitability for USB, CAN, and sensor interface protection in consumer and automotive electronics. |
| Leakage Current | <50 nA at 22 V working reverse voltage-minimizes standby power loss in battery-powered systems. |
| Package | SC-70 (SOT-323), 3-pin, Pb-free-supports automated placement and reflow soldering at 260 °C for 10 s. |
| AEC-Q101 Qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock-enables use in ADAS camera modules and body control units. |
Pinout & Package
SC-70 (SOT-323) package with molded thermosetting plastic case, UL 94 V-0 flammability rating, and corrosion-resistant finish for reliable solderability. Designed for high-density board assembly and available in 8 mm tape-and-reel (3,000 units/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode 1) | Anode-referenced Zener junction cathode | Connects to first protected signal line; reverse-biased during overvoltage to clamp to ~27 V. |
| Pin 2 (Cathode 2) | Anode-referenced Zener junction cathode | Connects to second protected signal line; electrically isolated from Pin 1 but shares common anode (Pin 3). |
| Pin 3 (Anode) | Common anode node | Reference terminal for both Zener junctions; tied to ground or system return plane for unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode topology | Enables simultaneous protection of two independent signal lines (e.g., CAN_H/CAN_L or RS-485 A/B) in one 2.2 × 1.35 mm footprint-reducing board area by >50% vs. discrete diodes. |
| Configurable unidirectional/bidirectional mode | Supports either two separate unidirectional clamps (Pins 1+3 and 2+3) or a single bidirectional clamp (Pins 1+2) via external bias-adapting to diverse interface standards without redesign. |
| 40 W peak pulse power | Withstands 1.0 ms transients up to 1.0 A at 40 V clamping-meeting ISO 7637-2 Pulse 1/2b and IEC 61000-4-5 surge immunity requirements for 12/24 V vehicle networks. |
| AEC-Q101 qualification | Includes stress testing across temperature cycling (−40 °C to +125 °C), high-temperature operating life, and ESD robustness-certifying suitability for automotive powertrain and chassis applications. |
| Low leakage & tight VBR tolerance | <50 nA IR at 22 V VRWM and ±5% VBR spread ensures minimal signal distortion and accurate trip-point stability in precision analog front-ends. |
Applications
| Automotive CAN Bus Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting CAN_H and CAN_L lines in engine control units against load dump and ESD events in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Dual-line transient voltage suppressor providing symmetric clamping to limit bus voltage excursions to ≤40 V during 1.0 A surges. Use Value: Eliminates need for two separate SC-70 Zeners, reducing BOM count and layout complexity while maintaining AEC-Q101 compliance for ASIL-B designs. | Use Scenario: Safeguarding half-duplex RS-485 transceivers in factory automation PLCs exposed to motor switching noise and lightning-induced surges. IC Role / Device Role / Timing Role: Common-anode dual Zener array clamping both A and B differential lines to ground, preventing transceiver latch-up during 40 W transient events. Use Value: Achieves <1 ns response time and 40 V clamping at 1.0 A-preserving signal integrity across 10 Mbps data rates without adding series impedance. |
| Medical Sensor Signal Conditioning | Consumer USB Data Line Protection |
Use Scenario: Shielding analog outputs of patient-monitoring biosensors (e.g., ECG, SpO₂) from electrostatic discharge during clinical handling. IC Role / Device Role / Timing Role: Low-leakage (<50 nA) dual Zener suppressing HBM ESD spikes >16 kV on isolated analog channels without loading sensitive amplifier inputs. Use Value: Maintains DC accuracy (no offset shift) and preserves low-noise performance (≤0.5 µV RMS) due to sub-50 nA leakage at 22 V bias. | Use Scenario: Protecting USB 2.0 D+ and D− lines in portable diagnostic devices against user-handling ESD per IEC 61000-4-2 Level 4. IC Role / Device Role / Timing Role: Bidirectional-capable dual Zener configured as back-to-back clamps between D+ and D−, shunting ESD current before IC damage occurs. Use Value: Enables full-speed (480 Mbps) USB operation with <0.5 pF inter-electrode capacitance-verified via onsemi Figure 3 curves-minimizing signal rise-time degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMBZ27VAT1G | Same Zener voltage (27 V) and SC-70 package, but single-junction (not dual); lacks common-anode dual-line capability. | Only protects one signal line; requires two devices for dual-line coverage-increasing PCB area and assembly cost. | Select only when protecting a single high-voltage rail where dual-channel integration is unnecessary. |
| PESD5V0S1BA,115 | Single-line 5 V bidirectional TVS in SOT-323; lower clamping voltage (12 V @ 1 A), no Zener regulation function. | Optimized for low-voltage digital I/O (USB, HDMI), not 24 V industrial or automotive signal lines. | Choose for 3.3/5 V logic-level interfaces; avoid for 24 V systems due to insufficient breakdown margin and non-Zener architecture. |
Compared with SZMMBZ27VAWT1G, SZMMBZ27VAT1G requires duplication for dual-line use and increases layout overhead, while PESD5V0S1BA,115 lacks the 27 V Zener regulation and 40 W surge capacity needed for 24 V system protection-making SZMMBZ27VAWT1G uniquely suited for space-constrained, high-reliability dual-signal transient suppression.
Availability
SZMMBZ27VAWT1G is available at Aetrix Electronics and suitable for automotive CAN bus protection, industrial RS-485 interfaces, and medical sensor signal conditioning requiring stable component supply across extended product lifecycles.
Supply support for SZMMBZ27VAWT1G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ/SZMMBZxxVAWT1G series targets compact, high-reliability transient voltage suppression-specifically engineered for dual-line ESD and surge protection in space-constrained automotive and industrial electronics where AEC-Q101 compliance and SC-70 scalability are critical.
FAQ
What is the Zener breakdown voltage tolerance for SZMMBZ27VAWT1G?
The SZMMBZ27VAWT1G has a specified Zener breakdown voltage range of 25.65 V to 28.35 V at 1 mA test current (IT), corresponding to ±5% tolerance around the nominal 27 V value. This tight tolerance ensures predictable clamping behavior in 24 V system protection circuits and is validated per onsemi's Electrical Characteristics table on page 2 of the November 2024 Rev. 6 datasheet. The SZMMBZ27VAWT1G maintains this specification across its qualified operating temperature range.
How does the common-anode configuration of SZMMBZ27VAWT1G affect circuit implementation?
The common-anode configuration of SZMMBZ27VAWT1G (Pin 3) allows both cathodes (Pins 1 and 2) to be independently connected to separate signal lines while referencing the same ground or return path-enabling efficient dual-line protection without shared cathode routing. This architecture reduces parasitic inductance versus discrete solutions and supports unidirectional clamping for each line. The SZMMBZ27VAWT1G datasheet confirms this topology in the marking diagram and mechanical outline (Style 4).
Is SZMMBZ27VAWT1G suitable for bidirectional signal protection like USB or CAN FD?
Yes-SZMMBZ27VAWT1G can be configured for bidirectional protection by connecting Pins 1 and 2 together and using them as a differential pair referenced to Pin 3, leveraging its symmetrical Zener characteristics. While optimized for 24 V unidirectional systems, its dual-junction design supports AC-coupled interfaces when externally biased. The SZMMBZ27VAWT1G's 40 V clamping and 16 kV HBM rating meet IEC 61000-4-2 for USB and CAN FD physical layer protection, though system-level validation is required.
What is the maximum allowable soldering temperature for SZMMBZ27VAWT1G?
The maximum case temperature for soldering SZMMBZ27VAWT1G is 260 °C for 10 seconds, as specified in the Mechanical Characteristics section of the onsemi datasheet. This Pb-free SC-70 package is compatible with standard lead-free reflow profiles (J-STD-020), and its void-free transfer-molded construction ensures thermal reliability during assembly. Always observe this limit to prevent internal bond wire damage or delamination-critical for long-term performance of the SZMMBZ27VAWT1G in automotive applications.
Does SZMMBZ27VAWT1G require external current-limiting resistors in typical protection circuits?
No-SZMMBZ27VAWT1G is designed to operate without series current-limiting resistors in most transient suppression applications because its 40 W peak pulse power rating and 40 V clamping voltage inherently limit energy dissipation during short-duration events (e.g., 1.0 ms pulses). However, for sustained overvoltage conditions beyond its power rating, external impedance may be needed. The SZMMBZ27VAWT1G datasheet specifies safe operation under defined pulse waveforms (Figure 5), confirming self-limiting behavior within those boundaries.
SZMMBZ27VAWT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 25.65V
- Voltage - Clamping (Max) @ Ipp:
- 40V
- Current - Peak Pulse (10/1000µs):
- 1A
- Power - Peak Pulse:
- 40W
- 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:
- SC-70-3 (SOT323)
SZMMBZ27VAWT1G FAQ
1.How can I place an order for SZMMBZ27VAWT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ27VAWT1G 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 SZMMBZ27VAWT1G reliable?
The price and inventory of SZMMBZ27VAWT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ27VAWT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ27VAWT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ27VAWT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ27VAWT1G?
SZMMBZ27VAWT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ27VAWT1G 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 SZMMBZ27VAWT1G?
For technical support, including SZMMBZ27VAWT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ27VAWT1G requirements.
6.How does Aetrix verify that SZMMBZ27VAWT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ27VAWT1G 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 SZMMBZ27VAWT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ27VAWT1G?
All SZMMBZ27VAWT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ27VAWT1G, 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 SZMMBZ27VAWT1G part is unused and in its original packaging.
Return procedure for SZMMBZ27VAWT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ27VAWT1G 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…
