My Inquiry
My Account
STMicroelectronics SM50T23AY
- Part No.:
- SM50T23AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM50T23AY.pdf
- Description:
- AUTOMOTIVE 5000 W, 20 V TVS IN S
- Quantity:
- Payment:
- Shipping:
Inventory:2,495
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM50T23AY from STMicroelectronics is an AEC-Q101-qualified unidirectional transient voltage suppression (TVS) diode in SMC package, designed for automotive power line protection. It features a 23 V nominal breakdown voltage (VBR = 22.2–24.6 V), 32.4 V clamping voltage at 155 A (8/20 µs), 5000 W peak pulse power (10/1000 µs), and ultra-low leakage current of 0.2 µA at 25 °C - enabling robust surge immunity in 12 V battery systems including e-brake controllers.
For engineers reviewing the SM50T23AY datasheet, SM50T23AY pinout, SM50T23AY application, or SM50T23AY equivalent, key selection criteria include ISO 7637-2 Pulse 1/2a/3a/3b compliance, junction temperature capability up to +175 °C, low dynamic resistance (20.8 mΩ), and SMC footprint compatibility with IPC7531-recommended layout.
Technical Context
This TVS diode uses planar silicon technology to achieve stable high-temperature operation and minimal leakage-critical for long-term reliability in under-hood automotive electronics. Its unidirectional configuration provides forward conduction only during negative transients, with cathode-bar marking indicating polarity.
The device meets stringent automotive ESD and surge standards: IEC 61000-4-2 (±30 kV contact/air), ISO 10605 (±30 kV), and ISO 7637-2 (Pulse 1: −150 V; Pulse 2a: +112 V; Pulse 3a: −220 V; Pulse 3b: +150 V), making it suitable for CAN/LIN bus line protection and body control module inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 22.2 / 23.4 / 24.6 V - ensures reliable turn-on before downstream IC damage in 12 V systems |
| VCL @ 155 A (8/20 µs) | 32.4 V - limits voltage seen by protected circuit during worst-case load dump events |
| IPP (8/20 µs) | 155 A - supports high-energy transient absorption without degradation |
| RD (dynamic resistance) | 20.8 mΩ - minimizes clamping voltage rise under high-current surges |
| IR @ VRM | 0.2 µA at 20 V - enables low-power standby operation without system leakage penalties |
| Tj max | +175 °C - sustains operation in engine compartment environments without derating |
| Package | SMC (DO-214AB) - JEDEC-registered, IPC7531-compliant footprint for automated assembly |
Pinout & Package
SM50T23AY is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (marked with bar) and Anode. The package complies with JEDEC MO-136AC and IPC7531 footprint recommendations, featuring matte tin lead finish and MSL Level 1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (bar-marked end) | Surge current sink node | Connected to protected line; conducts during reverse-biased overvoltage events |
| Anode | Reference/ground return path | Typically tied to chassis or battery ground; completes clamping current loop |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability across −55 °C to +175 °C junction temperature range |
| ISO 7637-2 Pulse 1/2a/3a/3b compliance | Clamps −150 V (P1), +112 V (P2a), −220 V (P3a), +150 V (P3b) transients without failure |
| Low dynamic resistance (20.8 mΩ) | Reduces VCL rise under high di/dt conditions, improving protection margin |
| Planar silicon construction | Enables stable leakage performance (<0.2 µA) and predictable VBR drift over temperature |
| UL94 V0 flammability rating | Ensures PCB-level fire safety in enclosed automotive enclosures |
Applications
| Electronic Brake Control Module (EBCM) | Body Control Module (BCM) Power Input |
|---|---|
Use Scenario: Protects 12 V supply rail from load dump and alternator-induced surges during ignition cycling. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and LDO input to clamp transients before regulation. Use Value: Prevents brownout or latch-up in microcontrollers and CAN transceivers during ISO 7637-2 Pulse 5b events (Us = 87 V, td = 150–400 ms). |
Use Scenario: Shields BCM power entry from jump-start spikes, battery reversal, and ISO 7637-2 Pulse 1/2a/3a/3b transients. IC Role / Device Role / Timing Role: Primary front-end surge suppressor on main 12 V input, upstream of fuse and DC-DC converter. Use Value: Maintains <0.2 µA leakage at 25 °C to avoid parasitic drain in always-on vehicle networks. |
| Electric Power Steering (EPS) Motor Driver | Advanced Driver Assistance Systems (ADAS) Camera Power Supply |
Use Scenario: Guards H-bridge gate driver supply against inductive kickback and battery transients. IC Role / Device Role / Timing Role: Fast-response TVS on 12 V auxiliary rail feeding motor driver ICs and current sense amplifiers. Use Value: Clamps to 32.4 V within nanoseconds, preventing overvoltage damage to sensitive analog front-ends and PWM controllers. |
Use Scenario: Secures 12 V input to ADAS camera ECU against ESD and conducted noise from nearby radar modules. IC Role / Device Role / Timing Role: First-line defense against ±30 kV IEC 61000-4-2 ESD events on external harness connections. Use Value: Achieves full ESD immunity without adding RC filtering that would degrade video signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower peak power (400 W), higher VCL (38.9 V @ 10.3 A), SMA package | Limited to non-automotive or low-energy industrial lines; not AEC-Q101 qualified | Select when cost sensitivity outweighs automotive reliability requirements and surge energy is ≤100 mJ |
| TPSMA6L24A | Same SMC package, but lower IPP (100 A), higher RD (32 mΩ), VCL = 38.2 V | Meets basic IEC 61000-4-2 but lacks ISO 7637-2 Pulse 1/3a validation | Use where ISO 7637-2 compliance is not required and thermal budget allows higher clamping voltage |
Compared with SMAJ24A and TPSMA6L24A, SM50T23AY delivers 12.5× higher peak pulse power, 20% lower clamping voltage at rated current, and full AEC-Q101/ISO 7637-2 certification - making it the only choice for safety-critical 12 V automotive power rails requiring sustained 175 °C operation.
Availability
SM50T23AY is available at Aetrix Electronics and suitable for electronic brake control modules, body control modules, electric power steering systems, and ADAS camera ECUs requiring stable component supply across automotive production lifecycles.
Supply support for SM50T23AY 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with vertical manufacturing capabilities.
The SM50TxxAY series belongs to ST's automotive-grade TVS portfolio, engineered specifically for ISO 7637-2 and ISO 16750-2 compliance in 12 V/24 V vehicle electrical architectures.
FAQ
What is the maximum clamping voltage of SM50T23AY under a 155 A 8/20 µs surge?
The maximum clamping voltage (VCL) is 32.4 V at 155 A for an 8/20 µs waveform, measured at Tamb = 25 °C. This value increases with junction temperature per the αT coefficient (10 × 10−4/°C), reaching ~34.1 V at Tj = 125 °C using the formula VCL(Tj) = VCL(25 °C) × [1 + αT × (Tj − 25)].
Is SM50T23AY suitable for bidirectional signal line protection?
No - SM50T23AY is a unidirectional TVS diode, marked with a cathode bar and intended for DC power line protection where polarity is fixed. For bidirectional protection (e.g., LIN or CAN bus), the pin-compatible SM50T23CAY variant must be used, which provides symmetrical clamping in both polarities.
How does SM50T23AY differ from standard SMAJ-series TVS diodes in automotive use?
SM50T23AY exceeds SMAJ devices in peak pulse power (5000 W vs. 400 W), junction temperature rating (+175 °C vs. +150 °C), and automotive qualification (AEC-Q101 certified vs. commercial grade). It also passes ISO 7637-2 Pulse 1/2a/3a/3b testing - a requirement SMAJ parts do not meet.
What PCB layout practices maximize thermal performance for SM50T23AY?
Follow ST's recommended IPC7531-compliant footprint: 5.11 mm × 8.19 mm pad length, 3.14 mm pad width, and ≥1.54 mm solder mask clearance. Use ≥2 cm² of 70 µm copper per lead (per Figure 12) and connect thermal pads directly to internal ground planes via ≥4 thermal vias (0.3 mm diameter) to achieve Rth(j-a) ≤ 40 °C/W under pulsed conditions.
SM50T23AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V (Max)
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 155A
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SM50T23AY FAQ
1.How can I place an order for SM50T23AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM50T23AY 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 SM50T23AY reliable?
The price and inventory of SM50T23AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM50T23AY is usually 5 days.
3.What payment methods are accepted for SM50T23AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM50T23AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM50T23AY?
SM50T23AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM50T23AY 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 SM50T23AY?
For technical support, including SM50T23AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM50T23AY requirements.
6.How does Aetrix verify that SM50T23AY is sourced from the original manufacturer or authorized distributors?
All SM50T23AY 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 SM50T23AY meets industry standards.
7.What is the process for return or replacement of SM50T23AY?
All SM50T23AY units undergo pre-shipment inspection (PSI). If there is an issue with SM50T23AY, 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 SM50T23AY part is unused and in its original packaging.
Return procedure for SM50T23AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM50T23AY 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
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…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
