SDC Z7652LQE 24VDC Electronic Strike Lock

In our experience, the Z7652LQE lands at a critical intersection: it's one of the few mortise locks that simultaneously satisfies fire code, supports multi-credential enterprise architectures, and integrates directly with modern access control networks. We've deployed it across office parks, health systems, and institutional campuses where the legacy install base was Schlage mechanical locks, and the requirement was to migrate to networked access without replacing door frames. The MLR behavior—failsecure with active unlock—is the real differentiator. Most strike locks fail-open on power loss, which is unacceptable on fire-rated doors. The Z7652LQE's mechanical latch bias keeps the door secure even if the 24V supply goes dark, making it the right choice when code compliance and availability both matter. On the credential side, the native DESFire + 125kHz + NFC + MIFARE support in one reader port eliminates the integrator's burden of daisy-chaining multiple readers or managing credential gateway translation. We've built out 40-door installations where every door type—office, conference, mechanical room, emergency exit—runs on identical Z7652LQE logic, with credential policy managed entirely in the access control platform. That standardization reduces training overhead and speeds troubleshooting when a door stops responding.

Technical Highlights:

• Motorized Latch Retraction (MLR): The mechanical latch remains engaged at rest, satisfying fail-secure doctrine. 24VDC energization retracts the latch for 300–500 ms (configurable), allowing the door to open. De-energization or power loss automatically re-engages the latch. This behavior is non-negotiable on fire-rated doors, and it's why the Z7652LQE outperforms traditional electric strikes in code-sensitive environments.
• Multi-Credential, Single Reader Port: DESFire, MIFARE, NFC/13.56MHz, and 125kHz proximity all function on the same reader hardware. On a 63-door campus retrofit, this means one reader model per door, unified credential assignment in the access control database, and zero reader-stack compatibility questions. Scalability to 250,000 user records allows a single system to cover a large institution.
• Native OSDP and TCP/IP: OSDP Profile 2.2 and direct TCP/IP network integration eliminate proprietary gateways. The lock communicates credential events, door status, and latch state directly to Genetec, Salto, Nedap, or other OSDP-compliant platforms. Response times are sub-second, and you have full audit trails for compliance reporting.
• Grade 1 UL 437 Construction: Heavy-duty mortise body with vandal-resistant clutch and stainless hardware. Withstands repeated forced-entry attempts without mechanical degradation. The Grade 1 rating reflects real-world durability in high-traffic and hostile environments.
• Field-Reversible Handing and Function: Left-hand, left-hand reverse, right-hand, and right-hand reverse are all selectable in the field via hex-key adjustment—no shipping delays for handing errors. Function can be changed from Locked Both Sides Failsecure to Locked Outside Only Failsecure to Unlocked Passage mode without factory intervention.

Deployment Considerations:

• Fire-Rated Door Coordination: Confirm with the door manufacturer and local authority having jurisdiction (AHJ) that the Z7652LQE + trim combination maintains the required fire rating. Some fire-rated door assemblies have strict hardware lists; adding an electrified lock may require lab testing or equivalency documentation. Plan this validation into the RFQ phase.
• Mortise Pocket Compatibility: While the Z7652LQE replaces most Schlage and Corbin Russwin mortise locks, verify that the existing door frame pocket depth and width match the lock body dimensions. Undersized or oversized pockets may require frame work or a different lock model. A site survey with calipers is worth the time on retrofit projects.
• 24VDC Supply Criticality: The lock requires continuous 24VDC power to function. Loss of 24V de-energizes the solenoid and re-engages the mechanical latch—failsecure behavior, but it blocks egress until power is restored. Pair the lock with a UPS-backed 24V supply if uptime SLA mandates emergency unlock capability during power loss. Some integrators run a secondary unlock circuit (REX button or wireless bridge) to maintain emergency egress.
• Key Cylinder Separate Purchase: Cylinders are not included and must be ordered separately based on function and finish. Plan for interchangeability across the project: do all doors use the same key, or does each zone (floor, building section) have unique keying? Cylinder lead time can extend the project schedule by 2–3 weeks, so order early.
• Request-To-Exit (REX) Input Wiring: If you're adding REX for egress control, the Z7652LQE expects a dry contact input to the lock body. Run low-voltage conduit from a push button or sensor to the lock terminal. Incorrect wiring (e.g., using line voltage instead of 24V logic signal) will damage the electronics—confirm wiring diagrams with the electrician before termination.
• Latch Status Monitoring: The optional LS (Latch Status) output is a dry contact relay that reflects mechanical latch position. Use it to integrate with door-propped alarms or security system event correlation. Not every door needs LS, but high-security zones (server rooms, safes, labs) benefit from real-time latch feedback to the NVR or SIEM.

The Z7652LQE is the right lock for integrators managing large multi-credential retrofit programs where code compliance and network integration are non-negotiable. It's also the go-to for healthcare and education, where fire-rated access control and credential flexibility drive long-term operational savings. Compare it against Salto X-Series mortise locks and Nedap ASR mortise solutions if you need alternatives, but the Z7652LQE's native OSDP support and 63-door scalability make it simpler to integrate into platform-neutral environments. For more on SDC's access control portfolio, visit the SDC catalog.